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Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Millimeter Wave Cloud Radar (MMCR) Handbook  

SciTech Connect

The millimeter cloud radar (MMCR) systems probe the extent and composition of clouds at millimeter wavelengths. The MMCR is a zenith-pointing radar that operates at a frequency of 35 GHz. The main purpose of this radar is to determine cloud boundaries (e.g., cloud bottoms and tops). This radar will also report radar reflectivity (dBZ) of the atmosphere up to 20 km. The radar possesses a doppler capability that will allow the measurement of cloud constituent vertical velocities.

KB Widener; K Johnson

2005-01-30T23:59:59.000Z

2

ARM: Millimeter Wave Cloud Radar (MMCR), replaces mmcrcal and mmcrmoments datastreams following C-40 processor upgrade of 2003.09.09  

DOE Data Explorer (OSTI)

Millimeter Wave Cloud Radar (MMCR), replaces mmcrcal and mmcrmoments datastreams following C-40 processor upgrade of 2003.09.09

Kevin Widener; Nitin Bharadwaj; Karen Johnson

3

Millimeter-Wavelength Radars: New Frontier in Atmospheric Cloud and Precipitation Research  

Science Conference Proceedings (OSTI)

During the past 20 yr there has been substantial progress on the development and application of millimeter-wavelength (3.2 and 8.6 mm, corresponding to frequencies of 94 and 35 GHz) radars in atmospheric cloud research, boosted by continuous ...

P. Kollias; E. E. Clothiaux; M. A. Miller; B. A. Albrecht; G. L. Stephens; T. P. Ackerman

2007-10-01T23:59:59.000Z

4

The Turbulence Structure in a Continental Stratocumulus Cloud from Millimeter-Wavelength Radar Observations  

Science Conference Proceedings (OSTI)

The turbulent-scale vertical velocity structure in a continental stratocumulus cloud is studied using a 3-mm wavelength Doppler radar operating in a vertically pointing mode. The radar observations provided 30-m sampling in the vertical with 2-s ...

Pavlos Kollias; Bruce Albrecht

2000-08-01T23:59:59.000Z

5

The Role of Spaceborne Millimeter-Wave Radar in the Global Monitoring of Ice Cloud  

Science Conference Proceedings (OSTI)

The purpose of this paper is to assess the potential of a spaceborne 94-GHz radar for providing useful measurements of the vertical distribution and water content of ice clouds on a global scale.

P. R. A. Brown; A. J. Illingworth; A. J. Heymsfield; G. M. McFarquhar; K. A. Browning; M. Gosset

1995-11-01T23:59:59.000Z

6

Properties of tropical convection observed by ARM millimeter-radars  

NLE Websites -- All DOE Office Websites (Extended Search)

Properties of tropical convection observed by ARM millimeter-radars Properties of tropical convection observed by ARM millimeter-radars Haynes, John Colorado State University Stephens, Graeme Colorado State University Category: Cloud Properties The results of an analysis of tropical cloud systems observed from a variety of vertically pointing radar systems are described. In particular, observations taken during five years of operation of the ARM millimeter wavelength radar system (MMCR) at Manus Island in the Tropical West Pacific region are characterized into cloud classes according to the radar reflectivity structures of these cloud systems, associated rainfall, and surface radiative properties. These observations of cloud properties are composited with respect to various phases of the Madden Julian Oscillation, which is a dominant mode of variability at Manus Island. A method of better

7

A Millimeter-Wavelength Dual-Polarization Doppler Radar for Cloud and Precipitation Studies  

Science Conference Proceedings (OSTI)

A pulse Doppler radar system operating at 35 GHz and having full polarization (linear and circular) diversity capability is described. Separate antennas are used for the transmitter and the receiver because this design approach allows better ...

F. Pasqualucci; B. W. Bartram; R. A. Kropfli; W. R. Moninger

1983-05-01T23:59:59.000Z

8

95-GHz Polarimetric Radar Measurements of Orographic Cap Clouds  

Science Conference Proceedings (OSTI)

The use of millimeter-wavelength radars for cloud microphysical research was investigated in experiments at the Elk Mountain Observatory near Laramie, Wyoming, between April 1990 and March 1992. The 95-GHz polarimetric radar used in these ...

Andrew Pazmany; James Mead; Robert McIntosh; Mark Hervig; Robert Kelly; Gabor Vali

1994-02-01T23:59:59.000Z

9

Cirrus Cloud Ice Water Content Radar Algorithm Evaluation Using an Explicit Cloud Microphysical Model  

Science Conference Proceedings (OSTI)

A series of cirrus cloud simulations performed using a model with explicit cloud microphysics is applied to testing ice water content retrieval algorithms based on millimeter-wave radar reflectivity measurements. The simulated ice particle size ...

Kenneth Sassen; Zhien Wang; Vitaly I. Khvorostyanov; Graeme L. Stephens; Angela Bennedetti

2002-06-01T23:59:59.000Z

10

The Atmospheric Radiation Measurement Program Cloud Radars: Operational Modes  

Science Conference Proceedings (OSTI)

During the past decade, the U.S. Department of Energy (DOE), through the Atmospheric Radiation Measurement (ARM) Program, has supported the development of several millimeter-wavelength radars for the study of clouds. This effort has culminated in ...

Eugene E. Clothiaux; Kenneth P. Moran; Brooks E. Martner; Thomas P. Ackerman; Gerald G. Mace; Taneil Uttal; James H. Mather; Kevin B. Widener; Mark A. Miller; Daniel J. Rodriguez

1999-07-01T23:59:59.000Z

11

ARM - Measurement - Radar Doppler  

NLE Websites -- All DOE Office Websites (Extended Search)

W-Band (95 GHz) ARM Cloud Radar MMCR : Millimeter Wavelength Cloud Radar RWP : Radar Wind Profiler 50RWP : Radar Wind Profiler (50 MHz) WACR : W-Band (95 GHz) ARM Cloud Radar...

12

An Unattended Cloud-Profiling Radar for Use in Climate Research  

Science Conference Proceedings (OSTI)

A new millimeter-wave cloud radar (MMCR) has been designed to provide detailed, long-term observations of nonprecipitating and weakly precipitating clouds at Cloud and Radiation Testbed (CART) sites of the Department of Energy's Atmospheric ...

Kenneth P. Moran; Brooks E. Martner; M. J. Post; Robert A. Kropfli; David C. Welsh; Kevin B. Widener

1998-03-01T23:59:59.000Z

13

The Atmospheric Radiation Measurement Program Cloud Profiling Radars: Second-Generation Sampling Strategies, Processing, and Cloud Data Products  

Science Conference Proceedings (OSTI)

The U.S. Department of Energy Atmospheric Radiation Measurement (ARM) Program operates millimeter-wavelength cloud radars in several climatologically distinct regions. The digital signal processors for these radars were recently upgraded and ...

Pavlos Kollias; Mark A. Miller; Edward P. Luke; Karen L. Johnson; Eugene E. Clothiaux; Kenneth P. Moran; Kevin B. Widener; Bruce A. Albrecht

2007-07-01T23:59:59.000Z

14

The Composite Characteristics of Cirrus Clouds: Bulk Properties Revealed by One Year of Continuous Cloud Radar Data  

Science Conference Proceedings (OSTI)

The properties of midlatitude cirrus clouds are examined using one year of continuous vertically pointing millimeter-wave cloud radar data collected at the Atmospheric Radiation Measurement Program Southern Great Plains site in Oklahoma. The goal ...

Gerald G. Mace; Eugene E. Clothiaux; Thomas P. Ackerman

2001-05-01T23:59:59.000Z

15

An Airborne Profiling Radar Study of the Impact of Glaciogenic Cloud Seeding on Snowfall from Winter Orographic Clouds  

Science Conference Proceedings (OSTI)

Data from an airborne vertically pointing millimeter-wave Doppler radar are used to study the cloud microphysical effect of glaciogenic seeding of cold-season orographic clouds. Fixed flight tracks were flown downstream of ground-based silver ...

Bart Geerts; Qun Miao; Yang Yang; Roy Rasmussen; Daniel Breed

2010-10-01T23:59:59.000Z

16

Radar Reflectivity of Cumulus Clouds  

Science Conference Proceedings (OSTI)

The relationships between the radar reflectivity factor Z and significant physical cloud parameters are studied from a dataset collected with an instrumented aircraft in non- or very weakly precipitating warm clouds. The cloud droplet populations ...

Henri Sauvageot; Jilani Omar

1987-06-01T23:59:59.000Z

17

Sources of Error in Dual-Wavelength Radar Remote Sensing of Cloud Liquid Water Content  

Science Conference Proceedings (OSTI)

Dual-wavelength ratio (DWR) techniques offer the prospect of producing high-resolution mapping of cloud microphysical properties, including retrievals of cloud liquid water content (LWC) from reflectivity measured by millimeter-wavelength radars. ...

John K. Williams; J. Vivekanandan

2007-08-01T23:59:59.000Z

18

The Atmospheric Radiation Measurement Program Cloud Profiling Radars: An Evaluation of Signal Processing and Sampling Strategies  

Science Conference Proceedings (OSTI)

The U.S. Department of Energy (DOE) Atmospheric Radiation Measurements (ARM) program operates millimeter-wavelength cloud radars (MMCRs) in several specific locations within different climatological regimes. These vertically pointing cloud ...

Pavlos Kollias; Bruce A. Albrecht; Eugene E. Clothiaux; Mark A. Miller; Karen L. Johnson; Kenneth P. Moran

2005-07-01T23:59:59.000Z

19

W-Band ARM Cloud Radar - Specifications and Design  

NLE Websites -- All DOE Office Websites (Extended Search)

W-Band ARM Cloud Radar - Specifications and Design W-Band ARM Cloud Radar - Specifications and Design K. B. Widener Pacific Northwest National Laboratory Richland, Washington J. B. Mead ProSensing, Inc. Amherst, Massachusetts Abstract The Atmospheric Radiation Measurement (ARM) Program and ProSensing, Inc. have teamed to develop and deploy the W-band ARM Cloud Radar (WACR) at the SGP central facility. The WACR will be co- located with the ARM millimeter wave cloud radar (MMCR) with planned operation to begin in early 2005. This radar will complement the measurements of the MMCR and will aid in filtering out insect contamination in the data. In this poster we present the design goals, expected performance characteristics, and the detailed design for the WACR. Introduction The MMCR has been operating at the Southern Great Plains (SGP) site since 1998. It has proven to be

20

Association of Tropical Cirrus in the 10–15-km Layer with Deep Convective Sources: An Observational Study Combining Millimeter Radar Data and Satellite-Derived Trajectories  

Science Conference Proceedings (OSTI)

In this paper, millimeter cloud radar (MMCR) and Geosynchronous Meteorological Satellite (GMS) data are combined to study the properties of tropical cirrus that are common in the 10–15-km layer of the tropical troposphere in the western Pacific. ...

Gerald G. Mace; Min Deng; Brian Soden; Ed Zipser

2006-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Cirrus Microphysical Properties and Air Motion Statistics Using Cloud Radar Doppler Moments. Part II: Climatology  

Science Conference Proceedings (OSTI)

The algorithm described in Part I has been applied to the millimeter cloud radar observations from January 1999 to December 2005 at the Atmospheric Radiation Measurement Program (ARM) Southern Great Plains (SGP) and Tropical Western Pacific (...

Min Deng; Gerald G. Mace

2008-12-01T23:59:59.000Z

22

A Technique for the Automatic Detection of Insect Clutter in Cloud Radar Returns  

Science Conference Proceedings (OSTI)

The U.S. Department of Energy Atmospheric Radiation Measurement (ARM) Program operates 35-GHz millimeter-wavelength cloud radars (MMCRs) in several climatologically distinct regions. The MMCRs, which are centerpiece instruments for the ...

Edward P. Luke; Pavlos Kollias; Karen L. Johnson; Eugene E. Clothiaux

2008-09-01T23:59:59.000Z

23

Scanning ARM Cloud Radar Handbook  

SciTech Connect

The scanning ARM cloud radar (SACR) is a polarimetric Doppler radar consisting of three different radar designs based on operating frequency. These are designated as follows: (1) X-band SACR (X-SACR); (2) Ka-band SACR (Ka-SACR); and (3) W-band SACR (W-SACR). There are two SACRs on a single pedestal at each site where SACRs are deployed. The selection of the operating frequencies at each deployed site is predominantly determined by atmospheric attenuation at the site. Because RF attenuation increases with atmospheric water vapor content, ARM's Tropical Western Pacific (TWP) sites use the X-/Ka-band frequency pair. The Southern Great Plains (SGP) and North Slope of Alaska (NSA) sites field the Ka-/W-band frequency pair. One ARM Mobile Facility (AMF1) has a Ka/W-SACR and the other (AMF2) has a X/Ka-SACR.

Widener, K; Bharadwaj, N; Johnson, K

2012-06-18T23:59:59.000Z

24

Cirrus Cloud Microphysical Property Retrieval Using Lidar and Radar Measurements. Part II: Midlatitude Cirrus Microphysical and Radiative Properties  

Science Conference Proceedings (OSTI)

The lidar–radar algorithm described in Part I of this set of papers is applied to 1000 h of Raman lidar and millimeter wave cloud radar (MMCR) data collected at the Atmospheric Radiation Measurement program Southern Great Plains Clouds and ...

Zhien Wang; Kenneth Sassen

2002-07-01T23:59:59.000Z

25

Radar and Radiation Properties of Ice Clouds  

Science Conference Proceedings (OSTI)

The authors derive relations of the equivalent radar reflectivity Ze and extinction coefficient ? of ice clouds and confirm the theory by in situ aircraft observations during the First International Satellite Cloud Climatology Project Regional ...

David Atlas; Sergey Y. Matrosov; Andrew J. Heymsfield; Ming-Dah Chou; David B. Wolff

1995-11-01T23:59:59.000Z

26

Properties of Tropical Convection Observed by Millimeter-Wave Radar Systems  

Science Conference Proceedings (OSTI)

This paper describes the results of analysis of over 825 000 profiles of millimeter-wave radar (MWR) reflectivities primarily collected by zenith-pointing surface radars observing tropical convection associated with various phases of activity of ...

Graeme L. Stephens; Norman B. Wood

2007-03-01T23:59:59.000Z

27

Cirrus Cloud Properties from a Cloud-Resolving Model Simulation Compared to Cloud Radar Observations  

Science Conference Proceedings (OSTI)

Cloud radar data collected at the Atmospheric Radiation Measurement (ARM) Program's Southern Great Plains site were used to evaluate the properties of cirrus clouds that occurred in a cloud-resolving model (CRM) simulation of the 29-day summer ...

Yali Luo; Steven K. Krueger; Gerald G. Mace; Kuan-Man Xu

2003-02-01T23:59:59.000Z

28

Objective Determination of Cloud Heights and Radar Reflectivities Using a Combination of Active Remote Sensors at the ARM CART Sites  

Science Conference Proceedings (OSTI)

The U.S. Department of Energy’s Atmospheric Radiation Measurement (ARM) Program is deploying sensitive, millimeter-wave cloud radars at its Cloud and Radiation Test Bed (CART) sites in Oklahoma, Alaska, and the tropical western Pacific Ocean. The ...

Eugene E. Clothiaux; Thomas P. Ackerman; Gerald G. Mace; Kenneth P. Moran; Roger T. Marchand; Mark A. Miller; Brooks E. Martner

2000-05-01T23:59:59.000Z

29

A Comparison of Simulated Cloud Radar Output from the Multiscale Modeling Framework Global Climate Model with CloudSat Cloud Radar Observations  

Science Conference Proceedings (OSTI)

Over the last few years a new type of global climate model (GCM) has emerged in which a cloud-resolving model is embedded into each grid cell of a GCM. This new approach is frequently called a multiscale modeling framework (MMF) or superparameterization. In this article we present a comparison of MMF output with radar observations from the NASA CloudSat mission, which uses a near-nadir-pointing millimeter-wavelength radar to probe the vertical structure of clouds and precipitation. We account for radar detection limits by simulating the 94 GHz radar reflectivity that CloudSat would observe from the high-resolution cloud-resolving model output produced by the MMF. Overall, the MMF does a good job of reproducing the broad pattern of tropical convergence zones, subtropical belts, and midlatitude storm tracks, as well as their changes in position with the annual solar cycle. Nonetheless, the comparison also reveals a number of model shortfalls including (1) excessive hydrometeor coverage at all altitudes over many convectively active regions, (2) a lack of low-level hydrometeors over all subtropical oceanic basins, (3) excessive low-level hydrometeor coverage (principally precipitating hydrometeors) in the midlatitude storm tracks of both hemispheres during the summer season (in each hemisphere), and (4) a thin band of low-level hydrometeors in the Southern Hemisphere of the central (and at times eastern and western) Pacific in the MMF, which is not observed by CloudSat. This band resembles a second much weaker ITCZ but is restricted to low levels.

Marchand, Roger T.; Haynes, J. M.; Mace, Gerald G.; Ackerman, Thomas P.; Stephens, Graeme L.

2009-01-13T23:59:59.000Z

30

CloudSat as a Global Radar Calibrator  

Science Conference Proceedings (OSTI)

The calibration of the CloudSat spaceborne cloud radar has been thoroughly assessed using very accurate internal link budgets before launch, comparisons with predicted ocean surface backscatter at 94 GHz, direct comparisons with airborne cloud ...

A. Protat; D. Bouniol; E. J. O’Connor; H. Klein Baltink; J. Verlinde; K. Widener

2011-03-01T23:59:59.000Z

31

A 94-GHz Doppler Radar for Cloud Observations  

Science Conference Proceedings (OSTI)

A Doppler radar operating at 3.2 mm wavelength was designed and assembled primarily for observation of clouds and precipitation. Phase detection of the radar signals which is required for Doppler operation is implemented through the use of a ...

Roger Lhermitte

1987-03-01T23:59:59.000Z

32

Evaluation of a 35 GHz Radar for Cloud Physics Research  

Science Conference Proceedings (OSTI)

A 1960 35 GHz radar has been modernized through the use of solid state electronics, Dopplerization and improved data-display capabilities. Radars of this frequency are particularly useful for observing the internal structures of clouds and for ...

Peter V. Hobbs; Nathan T. Funk; Richard R. Weiss Sr.; John D. Locatelli; Kumud R. Biswas

1985-03-01T23:59:59.000Z

33

The Effect of Radar Pulse Length on Cloud Reflectivity Statistics  

Science Conference Proceedings (OSTI)

When observing clouds with radars, there are a number of design parameters, such as transmitted power, antenna size, and wavelength, that can affect the detection threshold. In making calculations of radar thresholds, also known as minimum ...

Taneil Uttal; Robert A. Kropfli

2001-06-01T23:59:59.000Z

34

Cloud Liquid Water and Ice Content Retrieval by Multiwavelength Radar  

Science Conference Proceedings (OSTI)

Cloud liquid water and ice content retrieval in precipitating clouds by the differential attenuation method using a dual-wavelength radar, as a function of the wavelength pair, is first discussed. In the presence of non-Rayleigh scatterers, ...

Nicolas Gaussiat; Henri Sauvageot; Anthony J. Illingworth

2003-09-01T23:59:59.000Z

35

On Deriving Vertical Air Motions from Cloud Radar Doppler Spectra  

Science Conference Proceedings (OSTI)

A method for deriving vertical air motions from cloud radar Doppler spectrum measurements is introduced. The method is applicable to cloud volumes containing small particles, in this case liquid droplets, which are assumed to trace vertical air ...

Matthew D. Shupe; Pavlos Kollias; Michael Poellot; Edwin Eloranta

2008-04-01T23:59:59.000Z

36

A High Resolution Hydrometer Phase Classifier Based on Analysis of Cloud Radar Doppler Spectra.  

SciTech Connect

The lifecycle and radiative properties of clouds are highly sensitive to the phase of their hydrometeors (i.e., liquid or ice). Knowledge of cloud phase is essential for specifying the optical properties of clouds, or else, large errors can be introduced in the calculation of the cloud radiative fluxes. Current parameterizations of cloud water partition in liquid and ice based on temperature are characterized by large uncertainty (Curry et al., 1996; Hobbs and Rangno, 1998; Intriery et al., 2002). This is particularly important in high geographical latitudes and temperature ranges where both liquid droplets and ice crystal phases can exist (mixed-phase cloud). The mixture of phases has a large effect on cloud radiative properties, and the parameterization of mixed-phase clouds has a large impact on climate simulations (e.g., Gregory and Morris, 1996). Furthermore, the presence of both ice and liquid affects the macroscopic properties of clouds, including their propensity to precipitate. Despite their importance, mixed-phase clouds are severely understudied compared to the arguably simpler single-phase clouds. In-situ measurements in mixed-phase clouds are hindered due to aircraft icing, difficulties distinguishing hydrometeor phase, and discrepancies in methods for deriving physical quantities (Wendisch et al. 1996, Lawson et al. 2001). Satellite-based retrievals of cloud phase in high latitudes are often hindered by the highly reflecting ice-covered ground and persistent temperature inversions. From the ground, the retrieval of mixed-phase cloud properties has been the subject of extensive research over the past 20 years using polarization lidars (e.g., Sassen et al. 1990), dual radar wavelengths (e.g., Gosset and Sauvageot 1992; Sekelsky and McIntosh, 1996), and recently radar Doppler spectra (Shupe et al. 2004). Millimeter-wavelength radars have substantially improved our ability to observe non-precipitating clouds (Kollias et al., 2007) due to their excellent sensitivity that enables the detection of thin cloud layers and their ability to penetrate several non-precipitating cloud layers. However, in mixed-phase clouds conditions, the observed Doppler moments are dominated by the highly reflecting ice crystals and thus can not be used to identify the cloud phase. This limits our ability to identify the spatial distribution of cloud phase and our ability to identify the conditions under which mixed-phase clouds form.

Luke,E.; Kollias, P.

2007-08-06T23:59:59.000Z

37

Moving Cellular Structure of Fog Echoes Obtained with a Millimeter-Wave Scanning Doppler Radar at Kushiro, Japan  

Science Conference Proceedings (OSTI)

Observations of fogs with a millimeter-wave scanning Doppler radar were conducted at Kushiro in Hokkaido, Japan, in the summer seasons of 1999 and 2000. Three typical types of plan position indicator (PPI) displays were observed: cellular echoes ...

Akihisa Uematsu; Hiroyuki Hashiguchi; Michihiro Teshiba; Hisamichi Tanaka; Koichi Hirashima; Shoichiro Fukao

2005-08-01T23:59:59.000Z

38

Doppler Cloud Radar Derived Drop Size Distributions in Liquid Water Stratus Clouds  

Science Conference Proceedings (OSTI)

A cloud particle size retrieval algorithm that uses radar reflectivity factor and Doppler velocity obtained by a 35-GHz Doppler radar and liquid water path estimated from microwave radiometer radiance measurements is developed to infer the size ...

Seiji Kato; Gerald G. Mace; Eugene E. Clothiaux; James C. Liljegren; Richard T. Austin

2001-10-01T23:59:59.000Z

39

Plasma density measurements using FM-CW millimeter wave radar techniques  

SciTech Connect

Modified FM-CW radar techniques using swept millimeter-wave oscillators are useful for determining when a particular density has been reached in a plasma. Narrowband measurements on the Princeton Large Torus (PLT) demonstrate the suitability of these techniques for controlling high-power auxiliary plasma heating systems. Broadband measurements using these same techniques are proposed, by which the density profile could be determined.

Doane, J.L.; Mazzucato, E.; Schmidt, G.L.

1980-09-01T23:59:59.000Z

40

Time Correlations in Backscattering Radar Reflectivity Measurements from Cirrus Clouds  

NLE Websites -- All DOE Office Websites (Extended Search)

Time Correlations in Backscattering Radar Reflectivity Time Correlations in Backscattering Radar Reflectivity Measurements from Cirrus Clouds K. Ivanova, H. N. Shirer, and E. E. Clothiaux Pennsylvania State University University Park, Pennsylvania T. P. Ackerman Pacific Northwest National Laboratory Richland, Washington Introduction The state variables of the atmosphere exhibit correlations at various spatial and temporal scales. These correlations are crucial for understanding short- and long-term trends in climate. Cirrus clouds are important phenomena in the troposphere affecting climate. To improve future parameterization of cirrus clouds in climate models, we must understand the cloud properties and how they change within the cloud. We consider fluctuations of cloud radar signals obtained at isodepths within cirrus clouds

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

An Automated Cloud-Edge Detection Algorithm Using Cloud Physics and Radar Data  

Science Conference Proceedings (OSTI)

An automated cloud-edge detection algorithm was developed and extensively tested. The algorithm uses in situ cloud physics data measured by a research aircraft coupled with ground-based weather radar measurements to determine whether the aircraft ...

Jennifer G. Ward; Francis J. Merceret

2004-05-01T23:59:59.000Z

42

Estimation of Cloud Content by W-Band Radar  

Science Conference Proceedings (OSTI)

W-band (3.2-mm) radars are seeing increasing utilization as a result of improving microwave technologies and the increased research emphasis being given to nonprecipitating clouds. This niche is exemplified by the study of the radiatively ...

Kenneth Sassen; Liang Liao

1996-06-01T23:59:59.000Z

43

Prospects of the WSR-88D Radar for Cloud Studies  

Science Conference Proceedings (OSTI)

Sounding of nonprecipitating clouds with the 10-cm wavelength Weather Surveillance Radar-1988 Doppler (WSR-88D) is discussed. Readily available enhancements to signal processing and volume coverage patterns of the WSR-88D allow observations of a ...

Valery M. Melnikov; Dusan S. Zrni?; Richard J. Doviak; Phillip B. Chilson; David B. Mechem; Yefim L. Kogan

2011-04-01T23:59:59.000Z

44

High-Cloud Horizontal Inhomogeneity and Solar Albedo Bias  

Science Conference Proceedings (OSTI)

High ice cloud horizontal inhomogeneity is examined using optical depth retrievals from four midlatitude datasets. Three datasets include ice cloud microphysical profiles derived from millimeter cloud radar at the Southern Great Plains ...

Betty Carlin; Qiang Fu; Ulrike Lohmann; Gerald G. Mace; Kenneth Sassen; Jennifer M. Comstock

2002-09-01T23:59:59.000Z

45

Attenuation and Scattering of Millimeter Wavelength Radiation by Clouds and Precipitation  

Science Conference Proceedings (OSTI)

This article is concerned with investigations of scattering and absorption of 35, 94, 140, and 240 GHz radiation by clouds and precipitation. The computations of radar reflectivity, Doppler spectra, and absorption coefficients are performed using ...

Roger Lhermitte

1990-06-01T23:59:59.000Z

46

Mixed-Phase Cloud Retrievals Using Doppler Radar Spectra  

NLE Websites -- All DOE Office Websites (Extended Search)

Mixed-Phase Cloud Retrievals Using Mixed-Phase Cloud Retrievals Using Doppler Radar Spectra M. D. Shupe, S. Y. Matrosov, and T. L. Schneider National Oceanic and Atmospheric Administration Environmental Technology Laboratory Boulder, Colorado P. Kollias Rosentiel School of Marine Atmospheric Sciences University of Miami Miami, Florida Introduction The radar Doppler spectrum contains a wealth of information on cloud microphysical properties. Typically, radar-based cloud retrievals use only the zeroth or first moments of the Doppler spectrum - reflectivity and mean Doppler velocity - to derive quantities such as cloud water content and particle characteristic size (e.g., Liou and Sassen 1994; Matrosov et al. 2002). When using only the moments of the Doppler spectrum, important spectral information can be lost, particularly when the spectrum is

47

An Airborne Millimeter-Wave Imaging Radiometer for Cloud, Precipitation, and Atmospheric Water Vapor Studies  

Science Conference Proceedings (OSTI)

A six-channel airborne total-power Millimeter-wave Imaging Radiometer (MIR) was recently built to provide measurements of atmospheric water vapor, clouds, and precipitation. The instrument is a cross-track scanner that has a 3-dB beamwidth of 3.5°...

P. Racette; R. F. Adler; J. R. Wang; A. J. Gasiewski; D. M. Jakson; D. S. Zacharias

1996-06-01T23:59:59.000Z

48

Climatology of High Cloud Dynamics Using Profiling ARM Doppler Radar Observations  

Science Conference Proceedings (OSTI)

Ice cloud properties are influenced by cloud-scale vertical air motion. Dynamical properties of ice clouds can be determined via Doppler measurements from ground-based, profiling cloud radars. Here, the decomposition of the Doppler velocities into ...

Heike Kalesse; Pavlos Kollias

49

Visual Cloud Histories Related to First Radar Echo Formation in Northeast Colorado Cumulus  

Science Conference Proceedings (OSTI)

Using quantitative analysis of time-lapse motion pictures from aircraft and a sensitive meteorological radar, the cloud top history is related to the early radar echo development in 12 vigorous, summer, convective cloud turrets in northeastern ...

Charles A. Knight; William D. Hall; Philip M. Roskowski

1983-06-01T23:59:59.000Z

50

Polarimetric Radar Analysis of Raindrop Size Variability in Maritime and Continental Clouds  

Science Conference Proceedings (OSTI)

During the Queensland Cloud Seeding Research Program, the “CP2” polarimetric radar parameter differential radar reflectivity Zdr was used to examine the raindrop size evolution in both maritime and continental clouds. The focus of this paper is to ...

James W. Wilson; Charles A. Knight; Sarah A. Tessendorf; Courtney Weeks

2011-09-01T23:59:59.000Z

51

The Refractive Index Spectra within Clouds from Forward-Scatter Radar Observations  

Science Conference Proceedings (OSTI)

When long-wavelength radars are used to observe the atmosphere, there are occasions when radar return from a volume of cloud is unexpectedly large relative to that predicted by the classical incoherent scatter from individual cloud droplets. The ...

Earl E. Gossard; Richard G. Strauch

1981-02-01T23:59:59.000Z

52

W-band ARM Cloud Radar (WACR) Update and Status  

NLE Websites -- All DOE Office Websites (Extended Search)

W-band ARM Cloud Radar (WACR) Update and Status W-band ARM Cloud Radar (WACR) Update and Status PopStefanija, Ivan ProSensing, Inc. Mead, James ProSensing Inc. Widener, Kevin Pacific Northwest National Laboratory Category: Instruments Two W-band ARM Cloud Radars (WACR) have been developed for the SGP and the ARM Mobile Facility (AMF) by ProSensing. The SGP WACR was successfully deployed in the same shelter as the MMCR in 2005. It is currently collecting co-polarization and cross-polarization spectral moments (reflectivity, Doppler velocity, and spectral width) along with spectra data. The AMF WACR will be deployed with the AMF in Niamey, Niger early in 2006. We will present ingested WACR data formats available from the ARM Archive, a selected comparisons of WACR and MMCR data at SGP, and data from

53

An Evaluation of a 94-GHz Radar for Remote Sensing of Cloud Properties  

Science Conference Proceedings (OSTI)

The performance of a 94-GHz radar is evaluated for a variety of cloud conditions. Descriptions of the radar hardware, signal processing, and calibration provide an overview of the radar's capabilities. An important component of the signal ...

E. E. Clothiaux; M. A. Miller; B. A. Albrecht; T. P. Ackerman; J. Verlinde; D. M. Babb; R. M. Peters; W. J. Syrett

1995-04-01T23:59:59.000Z

54

First Radar Echoes and the Early ZDR History of Florida Cumulus  

Science Conference Proceedings (OSTI)

The early histories of radar echo and polarization differential reflectivity (ZDR) from growing cumulus clouds observed in Florida with a 10-cm-wavelength radar are reported in detail. Raindrops 1 to several millimeters in diameter are present at ...

Charles A. Knight; Jothiram Vivekanandan; Sonia G. Lasher-Trapp

2002-05-01T23:59:59.000Z

55

Composite Vertical Structure of Vertical Velocity in Nonprecipitating Cumulus Clouds  

Science Conference Proceedings (OSTI)

Vertical transects of Doppler vertical velocity data, obtained from an airborne profiling millimeter-wave cloud radar, are composited for a large number of cumulus clouds (Cu) at various stages of their life cycle, to examine typical circulations ...

Yonggang Wang; Bart Geerts

2013-05-01T23:59:59.000Z

56

Radar Observations of Transport and Diffusion in Clouds and Precipitation Using TRACIR  

Science Conference Proceedings (OSTI)

A remote-sensing technique called TRACIR (tracking air with circular-polarization radar) was developed recently for studying air-parcel trajectories in clouds. The technique uses a dual-circular-polarization radar to detect microwave chaff fibers ...

Brooks E. Martner; Robert A. Kropfli; John D. Marwitz

1992-06-01T23:59:59.000Z

57

Determination of the Radiative Properties of Stratiform Clouds from a Nadir-Looking 95-GHz Radar  

Science Conference Proceedings (OSTI)

Several space agencies are presently considering missions with active instruments (radar, lidar), which are able to document cloud stratification and cloud microphysical properties on the global scale. The objective of this paper is to develop an ...

A. Guyot; J. Testud; T. P. Ackerman

2000-01-01T23:59:59.000Z

58

Precipitation Characteristics of Trade Wind Clouds during RICO Derived from Radar, Satellite, and Aircraft Measurements  

Science Conference Proceedings (OSTI)

Precipitation characteristics of trade wind clouds over the Atlantic Ocean near Barbuda are derived from radar and aircraft data and are compared with satellite-observed cloud fields collected during the Rain in Cumulus over the Ocean (RICO) ...

Eric R. Snodgrass; Larry Di Girolamo; Robert M. Rauber

2009-03-01T23:59:59.000Z

59

Feeder-Cell Ingestion of Seeding Aerosol from Cloud Base Determined by Tracking Radar Chaff  

Science Conference Proceedings (OSTI)

Questions of delivery, transport, and dispersion of cloud seeding aerosol in a convective feeder cloud are addressed by using radar chaff as a surrogate for aerosol and tracking it with circular-polarization radar. In a case study, a line source ...

Roger F. Reinking; Brooks E. Martner

1996-09-01T23:59:59.000Z

60

A 94-GHz Cloud Radar System on a NASA High-Altitude ER-2 Aircraft  

Science Conference Proceedings (OSTI)

The 94-GHz (W band) Cloud Radar System (CRS) has been developed and flown on a NASA ER-2 high-altitude (20 km) aircraft. The CRS is a fully coherent, polarimetric Doppler radar that is capable of detecting clouds and precipitation from the ...

Lihua Li; Gerald M. Heymsfield; Paul E. Racette; Lin Tian; Ed Zenker

2004-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Incorporating Ice Crystal Scattering Databases in the Simulation of Millimeter-Wavelength Radar Reflectivity  

Science Conference Proceedings (OSTI)

The Canadian CloudSat/Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) Validation Project (C3VP) was designed to acquire aircraft, surface, and satellite observations of particle size distributions during cold season ...

Andrew L. Molthan; Walter A. Petersen

2011-03-01T23:59:59.000Z

62

Comparison of Airborne In Situ, Airborne Radar–Lidar, and Spaceborne Radar–Lidar Retrievals of Polar Ice Cloud Properties Sampled during the POLARCAT Campaign  

Science Conference Proceedings (OSTI)

This study illustrates the high potential of RALI, the French airborne radar–lidar instrument, for studying cloud processes and evaluating satellite products when satellite overpasses are available. For an Arctic nimbostratus ice cloud collected ...

Julien Delanoë; Alain Protat; Olivier Jourdan; Jacques Pelon; Mathieu Papazzoni; Régis Dupuy; Jean-Francois Gayet; Caroline Jouan

2013-01-01T23:59:59.000Z

63

Polarization diversity for millimeter space-borne Doppler radars: an answer for observing deep convection?  

Science Conference Proceedings (OSTI)

Spaceborne Doppler radars have the potential to provide key missing observations of convective vertical air motions especially over the tropical oceans. Such measurements can improve our understanding of the role of tropical convection in vertical ...

Alessandro Battaglia; Simone Tanelli; Pavlos Kollias

64

ARM - Publications: Science Team Meeting Documents: W-Band ARM Cloud Radar  

NLE Websites -- All DOE Office Websites (Extended Search)

W-Band ARM Cloud Radar System W-Band ARM Cloud Radar System Mead, James ProSensing Inc. Widener, Kevin Pacific Northwest National Laboratory The W-Band ARM Cloud Radar (WACR) is a dual polarization 95 GHz radar that will be deployed at the SGP CART site in the spring of 2005. The WACR system will be installed in the existing MMCR shelter, and will provide continuous zenith pointing measurements of clouds to compliment measurements provided by MMCR. Built by ProSensing Inc. of Amherst, MA, the WACR system include a high peak power (1.5 kW) EIKA transmitter, low noise receiver, and PC-based digital receiver. In addition to an internal calibration procedure, an electronically controlled deflector plate mounted on the roof of the MMCR shelter will be used to periodically illuminate a

65

Radar Analysis of a Tropical Convective Boundary Layer with Shallow Cumulus Clouds  

Science Conference Proceedings (OSTI)

A situation of fair weather cloudy convection is examined using a dual Doppler radar, environmental measurements and cloud photogrammetry. The convective layer is characterized by the interaction between the northward monsoon wind at low levels ...

Laurence Eymard

1984-04-01T23:59:59.000Z

66

Simulated Doppler Radar Observations of Inhomogeneous Clouds: Application to the EarthCARE Space Mission  

Science Conference Proceedings (OSTI)

A new simulation technique for spaceborne Doppler radar observations that was developed specifically for inhomogeneous targets is presented. Cloud inhomogeneity affects Doppler observations in two ways. First, line-of-sight velocities within the ...

N. A. J. Schutgens

2008-01-01T23:59:59.000Z

67

Multiparameter Radar and Aircraft Study of Raindrop Spectral Evolution in Warm-based Clouds  

Science Conference Proceedings (OSTI)

Radar measurements of reflectivity differential reflectivity, and X-band (3-cm wavelength) specific attenuation are used to inter some microphysical characteristics of warm-based convective clouds with emphasis on raindrop spectral evolution. The ...

V. N. Bringi; D. A. Burrows; S. M. Menon

1991-06-01T23:59:59.000Z

68

Retrieval of Cloud Microphysical Parameters from 94-GHz Radar Doppler Power Spectra  

Science Conference Proceedings (OSTI)

A technique is presented that uses Doppler spectra collected from a vertically pointing 94-GHz radar to reconstruct cloud and precipitation drop size distributions. A conceptual model describing the broadening of Doppler spectra by turbulence was ...

David M. Babb; Johannes Verlinde; Bruce A. Albrecht

1999-05-01T23:59:59.000Z

69

Investigation of the Turbulent Structure of a Cloud-Capped Mixed Layer Using Doppler Radar  

Science Conference Proceedings (OSTI)

A new method for retrieving air velocity fluctuations in the cloud-capped boundary layer (BL) using radar reflectivity and the Doppler velocity fields is proposed. The method was developed on the basis of data obtained by the Transportable ...

M. Pinsky; O. Krasnov; H. W. J. Russchenberg; A. Khain

2010-06-01T23:59:59.000Z

70

Separating Cloud and Drizzle Radar Moments during Precipitation Onset Using Doppler Spectra  

Science Conference Proceedings (OSTI)

The retrieval of cloud, drizzle, and turbulence parameters using radar Doppler spectra is challenged by the convolution of microphysical and dynamical influences and the overall uncertainty introduced by turbulence. A new technique that utilizes ...

Edward P. Luke; Pavlos Kollias

2013-08-01T23:59:59.000Z

71

ARRA-funded Cloud Radar Development for the Department of Energy's ARM Climate Research Facility  

E-Print Network (OSTI)

. Like many companies, ProSensing was expecting to experience a considerable reduction in orders in 2009 will keep a number of their technician employed for several months in mid-2010. In addition to the direct for similar cloud radar contracts for customers in India, China and Korea. By developing these complex radar

72

Radar Nowcasting of Cloud-to-Ground Lightning over Houston, Texas  

Science Conference Proceedings (OSTI)

Ten years (1997–2006) of summer (June–August) daytime (1400–0000 UTC) Weather Surveillance Radar-1988 Doppler data for Houston, Texas, were examined to determine the best radar-derived predictors of the first cloud-to-ground lightning flash from a ...

Richard M. Mosier; Courtney Schumacher; Richard E. Orville; Lawrence D. Carey

2011-04-01T23:59:59.000Z

73

Polarimetric Radar Observations in the Ice Region of Precipitating Clouds at C-Band and X-Band Radar Frequencies  

Science Conference Proceedings (OSTI)

Data collected by C-band and X-band radars in northwestern Italy are analyzed to study the behavior of the polarimetric variables in the ice region of precipitating clouds, with special emphasis on the specific differential phase Kdp. It is found ...

R. Bechini; L. Baldini; V. Chandrasekar

2013-05-01T23:59:59.000Z

74

Analysis of Aircraft, Radiosonde, and Radar Observations in Cirrus Clouds Observed during FIRE II: The Interactions between Environmental Structure, Turbulence, and Cloud Microphysical Properties  

Science Conference Proceedings (OSTI)

Ways to determine the turbulence intensity and the horizontal variability in cirrus clouds have been investigated using First International Satellite Cloud Climatology Project (ISCCP) Regional Experiment II aircraft, radiosonde, and radar data. ...

Samantha A. Smith; Anthony D. DelGenio

2001-03-01T23:59:59.000Z

75

HIGH SPECTRAL RESOLUTION LIDAR EMULATION VIA DOPPLER CLOUD RADAR SPECTRUM PROCESSING AND ITS IMPLICATIONS FOR  

E-Print Network (OSTI)

targeting the liquid, and radar, the ice. Depolarization measurements can assist in resolving phase to identify liquid, ice, and mixed-phase clouds. __________ NOTICE: This manuscript has been authored IMPLICATIONS FOR CLOUD PHASE IDENTIFICATION E. Luke, P. Kollias, and M. Shupe Presented at the American

76

Scanning ARM Cloud Radars – Part II: Data Quality Control and Processing  

Science Conference Proceedings (OSTI)

The Scanning ARM Cloud Radars (SACR’s) are the primary instruments for documenting the four-dimensional structure and evolution of clouds within a 20-30 km radius from the ARM fixed and mobile sites. Here, the post-processing of the calibrated ...

Pavlos Kollias; Ieng Jo; Paloma Borque; Aleksandra Tatarevic; Katia Lamer; Nitin Bharadwaj; Kevin Widener; Karen Johnson; Eugene E. Clothiaux

77

Comparison of Simulated and Observed Continental Tropical Anvil Clouds and Their Radiative Heating Profiles  

Science Conference Proceedings (OSTI)

Vertically pointing millimeter-wavelength radar observations of anvil clouds extending from mesoscale convective systems (MCSs) that pass over an Atmospheric Radiation Measurement Program (ARM) field site in Niamey, Niger, are compared to anvil ...

Scott W. Powell; Robert A. Houze Jr.; Anil Kumar; Sally A. McFarlane

2012-09-01T23:59:59.000Z

78

Ka-Band ARM Zenith Radar (KAZR) Instrument Handbook  

SciTech Connect

The Ka-band ARM zenith radar (KAZR) is a zenith-pointing Doppler cloud radar operating at approximately 35 GHz. The KAZR is an evolutionary follow-on radar to ARM's widely successful millimeter-wavelength cloud radar (MMCR). The main purpose of the KAZR is to provide vertical profiles of clouds by measuring the first three Doppler moments: reflectivity, radial Doppler velocity, and spectra width. At the sites where the dual-polarization measurements are made, the Doppler moments for the cross-polarization channel are also available. In addition to the moments, velocity spectra are also continuously recorded for each range gate.

Widener, K; Bharadwaj, N; Johnson, K

2012-03-06T23:59:59.000Z

79

Initialization of a Cloud-Resolving Model with Airborne Doppler Radar Observations of an Oceanic Tropical Convective System  

Science Conference Proceedings (OSTI)

Doppler radar–derived fields of wind and reflectivity, retrieved temperature perturbations, estimated water vapor, and cloud water contents are used to initialize a nonhydrostatic cloud-resolving model. Airborne Doppler data collected in a ...

Soline Bielli; Frank Roux

1999-06-01T23:59:59.000Z

80

Cloud Model-Based Simulation of Spaceborne Radar Observations  

Science Conference Proceedings (OSTI)

Simulations of observations from potential spaceborne radars are made based on storm structure generated from the three-dimensional (3D) Goddard cumulus ensemble model simulation of an intense overland convective system. Five frequencies of 3, 10,...

H-Y. M. Yeh; N. Prasad; R. Meneghini; W-K. Tao; J. A. Jones; R. F. Adler

1995-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Cloud Ice Crystal Classification Using a 95-GHz Polarimetric Radar  

Science Conference Proceedings (OSTI)

Two algorithms are presented for ice crystal classification using 95-GHz polarimetric radar observables and air temperature (T). Both are based on a fuzzy logic scheme. Ice crystals are classified as columnar crystals (CC), planar crystals (PC), ...

K. Aydin; J. Singh

2004-11-01T23:59:59.000Z

82

Degradation of Radar Reflectivity by Cloud Attenuation at Microwave Frequency  

Science Conference Proceedings (OSTI)

The main object of this paper is to emphasize that clouds—the nonprecipitating component of condensed atmospheric water—can produce a strong attenuation at operational microwave frequencies, although they present a low reflectivity preventing ...

Olivier Pujol; Jean-François Georgis; Laurent Féral; Henri Sauvageot

2007-04-01T23:59:59.000Z

83

Quantification of Cloud Microphysical Parameterization Uncertainty Using Radar Reflectivity  

Science Conference Proceedings (OSTI)

Uncertainty in cloud microphysical parameterization—a leading order contribution to numerical weather prediction error—is estimated using a Markov chain Monte Carlo (MCMC) algorithm. An inversion is performed on 10 microphysical parameters using ...

Marcus van Lier-Walqui; Tomislava Vukicevic; Derek J. Posselt

2012-11-01T23:59:59.000Z

84

Polarization Diversity Pulse-Pair Technique for Millimeter-WaveDoppler Radar Measurements of Severe Storm Features  

Science Conference Proceedings (OSTI)

The Polarization Diversity Pulse-Pair (PDPP) technique can extend simultaneously the maximum unambiguous range and the maximum unambiguous velocity of a Doppler weather radar. This technique has been applied using a high-resolution 95-GHz radar ...

Andrew L. Pazmany; John C. Galloway; James B. Mead; Ivan Popstefanija; Robert E. McIntosh; Howard W. Bluestein

1999-12-01T23:59:59.000Z

85

Coincident In Situ and W-Band Radar Measurements of Drop Size Distribution in a Marine Stratus Cloud and Drizzle  

Science Conference Proceedings (OSTI)

Investigation of precipitation formation requires measurements of the drop size distribution in a cloud. These measurements have usually been made using ground-based radar systems or aircraft in situ probes. Difficulties encountered in practice ...

J. Galloway; A. Pazmany; J. Mead; R. E. McIntosh; D. Leon; J. French; S. Haimov; R. Kelly; G. Vali

1999-05-01T23:59:59.000Z

86

Retrieval of Cloud Water and Water Vapor Contents from Doppler Radar Data in a Tropical Squall Line  

Science Conference Proceedings (OSTI)

This paper describes the retrieval of cloud water and water vapor contents from Doppler radar data. The convective part of a tropical squall line (22 June 1981) observed during the COPT 81 (Convection Profonde Tropicale 1981) West African ...

Danièle Hauser; Paul Amayenc

1986-04-01T23:59:59.000Z

87

Cloud-Resolving Hurricane Initialization and Prediction through Assimilation of Doppler Radar Observations with an Ensemble Kalman Filter  

Science Conference Proceedings (OSTI)

This study explores the assimilation of Doppler radar radial velocity observations for cloud-resolving hurricane analysis, initialization, and prediction with an ensemble Kalman filter (EnKF). The case studied is Hurricane Humberto (2007), the ...

Fuqing Zhang; Yonghui Weng; Jason A. Sippel; Zhiyong Meng; Craig H. Bishop

2009-07-01T23:59:59.000Z

88

Cirrus Cloud Microphysical Property Retrieval Using Lidar and Radar Measurements. Part I: Algorithm Description and Comparison with In Situ Data  

Science Conference Proceedings (OSTI)

A retrieval algorithm is described to estimate vertical profiles of cirrus-cloud ice water content (IWC) and general effective size Dge from combined lidar and radar measurements. In the algorithm, the lidar extinction coefficient ? is ...

Zhien Wang; Kenneth Sassen

2002-03-01T23:59:59.000Z

89

The Retrieval of Ice-Cloud Properties from Cloud Radar and Lidar Synergy  

Science Conference Proceedings (OSTI)

Clouds are an important component of the earth’s climate system. A better description of their microphysical properties is needed to improve radiative transfer calculations. In the framework of the Earth, Clouds, Aerosols, and Radiation Explorer (...

Claire Tinel; Jacques Testud; Jacques Pelon; Robin J. Hogan; Alain Protat; Julien Delanoë; Dominique Bouniol

2005-06-01T23:59:59.000Z

90

Doppler Radar Signatures of Developing Thunderstorms and Their Potential to Indicate the Onset of Cloud-to-Ground Lightning  

Science Conference Proceedings (OSTI)

The capability of Doppler weather radars to short-term forecast the initiation of thunderstorms and the onset of cloud-to-ground (CG) lightning is examined. Doppler weather radar data from 28 thunderstorms were analyzed from August 1990 in the ...

Kurt D. Hondl; Michael D. Eilts

1994-08-01T23:59:59.000Z

91

Radar-Derived Forecasts of Cloud-to-Ground Lightning Over Houston, Texas  

E-Print Network (OSTI)

Ten years (1997 - 2006) of summer (June, July, August) daytime (14 - 00 Z) Weather Surveillance Radar - 1988 Doppler data for Houston, TX were examined to determine the best radar-derived lightning forecasting predictors. Convective cells were tracked using a modified version of the Storm Cell Identification and Tracking (SCIT) algorithm and then correlated to cloud-to-ground lightning data from the National Lightning Detection Network (NLDN). Combinations of three radar reflectivity values (30, 35, and 40 dBZ) at four isothermal levels (-10, -15, -20, and updraft -10 degrees C) and a new radar-derived product, vertically integrated ice (VII), were used to optimize a radar-based lightning forecast algorithm. Forecasts were also delineated by range and the number of times a cell was identified and tracked by the modified SCIT algorithm. This study objectively analyzed 65,399 unique cells, and 1,028,510 to find the best lightning forecast criteria. Results show that using 30 dBZ at the -20 degrees C isotherm on cells within 75 km of the radar that have been tracked for at least 2 consecutive scan produces the best forecasts with a critical success index (CSI) of 0.71. The best VII predictor was 0.734 kg m-2 on cells within 75 km of the radar that have been tracked for at least 2 consecutive scans producing a CSI of 0.68. Results of this study further suggest that combining the radar reflectivity and VII methods can result in a more accurate lightning forecast than either method alone.

Mosier, Richard Matthew

2009-12-01T23:59:59.000Z

92

The Retrieval of Stratus Cloud Droplet Effective Radius with Cloud Radars  

Science Conference Proceedings (OSTI)

In situ samples of cloud droplets by aircraft in Oklahoma in 1997, the Surface Heat Budget of the Arctic Ocean (SHEBA)/First ISCCP Regional Experiment (FIRE)-Arctic Cloud Experiment (ACE) in 1998, and various other locations around the world were ...

Shelby Frisch; Matthew Shupe; Irina Djalalova; Graham Feingold; Michael Poellot

2002-06-01T23:59:59.000Z

93

ARM: Ka-Band Scanning ARM Cloud Radar (KASACR) Hemispherical Sky RHI Scan (6 horizon-to-horizon scans at 30-degree azimuth intervals)  

DOE Data Explorer (OSTI)

Ka-Band Scanning ARM Cloud Radar (KASACR) Hemispherical Sky RHI Scan (6 horizon-to-horizon scans at 30-degree azimuth intervals)

Nitin Bharadwaj; Kevin Widener

94

Cloud-Layer Overlap Characteristics Derived from Long-Term Cloud Radar Data  

Science Conference Proceedings (OSTI)

Assumptions regarding the vertical overlap characteristics of horizontal cloudy layers have been shown to be important to both the radiation transfer and the cloud microphysics that are predicted in general circulation models. Certain reasonable ...

Gerald G. Mace; Sally Benson-Troth

2002-09-01T23:59:59.000Z

95

Organization and Structure of Clouds and Precipitation on the Mid-Atlantic Coast of the United States. Part IV: Retrieval of the Thermodynamic and Cloud Microphysical Structures of a Frontal Rainband from Doppler Radar Data  

Science Conference Proceedings (OSTI)

The thermodynamic and cloud structure of a relatively weak wintertime frontal rainband are derived from dual-Doppler radar measurements, soundings and high resolution surface observations, and with a cloud model. These derivations are simplified ...

Bart Geerts; Peter V. Hobbs

1991-05-01T23:59:59.000Z

96

ARM - Evaluation Product - Active Remote Sensing of Clouds from Ka-band ARM  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsActive Remote Sensing of Clouds from Ka-band ProductsActive Remote Sensing of Clouds from Ka-band ARM Zenith Radars Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : Active Remote Sensing of Clouds from Ka-band ARM Zenith Radars Site(s) GAN SGP General Description The Ka-band ARM Zenith Radars (KAZRs) have replaced the long-serving Millimeter Cloud Radars, or MMCRs. Accordingly, the primary MMCR Value Added Product (VAP), the Active Remote Sensing of CLouds (ARSCL) product, is being replaced by a KAZR-based version, the KAZR-ARSCL VAP. KAZR-ARSCL provides cloud boundaries and best-estimate time-height fields of radar moments. KAZR observations are corrected for water vapor attenuation and velocity aliasing and significant detection masks are produced. KAZR-ARSCL

97

Observations of tornadoes and wall clouds with a portable FM-CW Doppler radar: 1989--1990 results  

SciTech Connect

The purpose of this paper is to report on our progress using a portable, 1 W,FM (frequency modulated)-CW (continuous wave) Doppler radar developed at the Los Alamos National Laboratory (LANL), to make measurements of the wind field in tornadoes and wall clouds along with simultaneous visual documentation. Results using a CW version of the radar in 1987--1988 are given in Bluestein and Unruh (1989). 18 refs., 2 figs., 1 tab.

Bluestein, H.B. (Oklahoma Univ., Norman, OK (USA). School of Meteorology); Unruh, W.P. (Los Alamos National Lab., NM (USA))

1990-01-01T23:59:59.000Z

98

Validation of Satellite-Based Objective Overshooting Cloud-Top Detection Methods Using CloudSat Cloud Profiling Radar Observations  

Science Conference Proceedings (OSTI)

Two satellite infrared-based overshooting convective cloud-top (OT) detection methods have recently been described in the literature: 1) the 11-?m infrared window channel texture (IRW texture) method, which uses IRW channel brightness temperature (...

Kristopher M. Bedka; Richard Dworak; Jason Brunner; Wayne Feltz

2012-10-01T23:59:59.000Z

99

Investigating the Potential of Using Radar Echo Reflectivity to Nowcast Cloud-to-Ground Lightning Initiation over Southern Ontario  

Science Conference Proceedings (OSTI)

The potential for using radar echo reflectivity to forecast cloud-to-ground (CG) lightning initiation in the 0–1-h time frame was investigated in southern Ontario, Canada. The main purpose of this investigation was to determine a reflectivity ...

Y. Helen Yang; Patrick King

2010-08-01T23:59:59.000Z

100

The Ability of MM5 to Simulate Ice Clouds: Systematic Comparison between Simulated and Measured Fluxes and Lidar/Radar Profiles at the SIRTA Atmospheric Observatory  

Science Conference Proceedings (OSTI)

The ability of the fifth-generation Pennsylvania State University–NCAR Mesoscale Model (MM5) to simulate midlatitude ice clouds is evaluated. Model outputs are compared to long-term meteorological measurements by active (radar and lidar) and ...

M. Chiriaco; R. Vautard; H. Chepfer; M. Haeffelin; J. Dudhia; Y. Wanherdrick; Y. Morille; A. Protat

2006-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Discrimination of Mixed- versus Ice-Phase Clouds Using Dual-Polarization Radar with Application to Detection of Aircraft Icing Regions  

Science Conference Proceedings (OSTI)

Dual-polarization radar measurements and in situ measurements of supercooled liquid water and ice particles within orographic cloud systems are used to develop probabilistic criteria for identifying mixed-phase versus ice-phase regions of sub-0°C ...

David M. Plummer; Sabine Göke; Robert M. Rauber; Larry Di Girolamo

2010-05-01T23:59:59.000Z

102

Ice Cloud Retrievals and Analysis with the Compact Scanning Submillimeter Imaging Radiometer and the Cloud Radar System during CRYSTAL FACE  

Science Conference Proceedings (OSTI)

Submillimeter-wave radiometry is a new technique for determining ice water path (IWP) and particle size in upper-tropospheric ice clouds. The first brightness temperatures images of ice clouds above 340 GHz were measured by the Compact Scanning ...

K. Franklin Evans; James R. Wang; Paul E. Racette; Gerald Heymsfield; Lihua Li

2005-06-01T23:59:59.000Z

103

Using MSG-SEVIRI Cloud Physical Properties and Weather Radar Observations for the Detection of Cb/TCu Clouds  

Science Conference Proceedings (OSTI)

A new automated daytime cumulonimbus/towering cumulus (Cb/TCu) cloud detection method for the months of May–September is presented that combines information on cloud physical properties retrieved from the Spinning Enhanced Visible and Infrared ...

Cintia Carbajal Henken; Maurice J. Schmeits; Hartwig Deneke; Rob A. Roebeling

2011-07-01T23:59:59.000Z

104

Millimeter wave scattering from ice crystals and their aggregates: Comparing cloud model simulations with X and Kaband  

E-Print Network (OSTI)

of the relative amounts of cloud liquid and ice. Modeling studies have shown that the poorly understood ice phase parameterizations has proven to be a difficult task. This study evaluates results of different ice microphysics conclusions about the appropriateness of different CRM ice microphysics parameterizations. Citation: Botta, G

105

Dynamical Characteristics of Cirrus Clouds from Aircraft and Radar Observations in Micro and Meso-? Scales  

Science Conference Proceedings (OSTI)

Cirrus clouds that formed on 26 November and 6 December 1991 during the First International Satellite Cloud Climatology Project Regional Experiment (FIRE) II, which took place over the Kansas region. are studied because of significant dynamic ...

I. Gultepe; D. O'C. Starr; A. J. Heymsfield; T. Uttal; T. P. Ackerman; D. L. WestPhal

1995-12-01T23:59:59.000Z

106

Microphysical and Radar Observations of Seeded and Nonseeded Continental Cumulus Clouds  

Science Conference Proceedings (OSTI)

Controlled cloud seeding experiments were conducted near Bethlehem, South Africa during the summer of 1984–85. The experimental unit was the semi-isolated cumulus congestus cloud. Microphysical measurements were obtained by three instrumented ...

T. W. Krauss; R. T. Bruintjes; J. Verlinde

1987-05-01T23:59:59.000Z

107

An Intercomparison of UW Cloud-Top Cooling Rates with WSR-88D Radar Data  

Science Conference Proceedings (OSTI)

The University of Wisconsin Convective Initiation (UWCI) algorithm utilizes geostationary IR satellite data to compute cloud-top cooling (UW-CTC) rates and assign CI nowcasts to vertically growing clouds. This study is motivated by National ...

Daniel C. Hartung; Justin M. Sieglaff; Lee M. Cronce; Wayne F. Feltz

2013-04-01T23:59:59.000Z

108

Observations of the Wind Field in Tornadoes, Funnel Clouds, and Wall Clouds with a Portable Doppler Radar  

Science Conference Proceedings (OSTI)

A severe-storm intercept field program was held in Oklahoma and nearby parts of Texas during the 1987–38 spring seasons. The purpose of the experiment was to use, for the first time, a low-power, portable, continuous-wave (CW), 3-cm Doppler radar ...

H. B. Bluestein; W. P. Unruh

1989-12-01T23:59:59.000Z

109

Fixed-Antenna Pointing-Angle Calibration of Airborne Doppler Cloud Radar  

Science Conference Proceedings (OSTI)

Doppler velocity measurements from airborne meteorological Doppler radars require removal of the aircraft motion contribution in order to provide radial velocity of hydrometeor targets. This is a critical step for hydrometeor motion and wind ...

Samuel Haimov; Alfred Rodi

2013-10-01T23:59:59.000Z

110

Inside Volcanic Clouds: Remote Sensing of Ash Plumes Using Microwave Weather Radars  

Science Conference Proceedings (OSTI)

Microphysical and dynamical features of volcanic tephra due to Plinian and sub-Plinian eruptions can be quantitatively monitored by using ground-based microwave weather radars. The methodological rationale and unique potential of this remote-sensing ...

Frank S. Marzano; Errico Picciotti; Mario Montopoli; Gianfranco Vulpiani

2013-10-01T23:59:59.000Z

111

Fixed-antenna Pointing-angle Calibration of Airborne Doppler Cloud Radar  

Science Conference Proceedings (OSTI)

Doppler velocity measurements from airborne meteorological Doppler radars require removal of the aircraft motion contribution in order to provide radial velocity of hydrometeor targets. This is a critical step for hydrometeor motion and wind ...

Samuel Haimov; Alfred Rodi

112

A C-Band Coherent Polarimetric Radar for Propagation and Cloud Physics Research  

Science Conference Proceedings (OSTI)

At DFVLR in Oberpfaffenhofen, West Germany, a recently developed coherent polarimetric C-band radar is now in operation for research in atmospheric physics and radio wave propagation physics. Its capabilities provide opportunities to investigate ...

Arno C. Schroth; Madhukar S. Chandra; Peter F. Mesichner

1988-12-01T23:59:59.000Z

113

Particle Size Estimation in Ice-Phase Clouds Using Multifrequency Radar Reflectivity Measurements at 95, 33, and 2.8 GHz  

Science Conference Proceedings (OSTI)

Multifrequency radar measurements collected at 2.8 (S band), 33.12 (Ka band), and 94.92 GHz (W band) are processed using a neural network to estimate median particle size and peak number concentration in ice-phase clouds composed of dry crystals ...

Stephen M. Sekelsky; Warner L. Ecklund; John M. Firda; Kenneth S. Gage; Robert E. McIntosh

1999-01-01T23:59:59.000Z

114

Influences of the Local Environment on Supercell Cloud-to-Ground Lightning, Radar Characteristics, and Severe Weather on 2 June 1995  

Science Conference Proceedings (OSTI)

Radar, cloud-to-ground (CG) lightning characteristics, and storm reports were documented for 20 long-lived supercell thunderstorms that occurred during a 6-h period in the west Texas Panhandle on 2–3 June 1995. These thunderstorms occurred in ...

Matthew S. Gilmore; Louis J. Wicker

2002-10-01T23:59:59.000Z

115

Detection of supercooled liquid in mixedphase clouds using radar Doppler spectra  

E-Print Network (OSTI)

in the temperature range from 0 to -40°C, where both liquid and ice hydrometeor phases are sustainable of their hydrometeors (i.e., liquid or ice). Current cloud parameterizations that parti- tion water into liquid and ice 2010; published 1 October 2010. [1] Cloud phase identification from active remote sensors

Shupe, Matthew

116

A Dual-Wavelength Radar Method for Ice-Water Characterization in Mixed-Phase Clouds  

Science Conference Proceedings (OSTI)

A dual-wavelength method to differentiate supercooled water from ice and to measure mass content in each phase in cold stratiform clouds is proposed and discussed. The differential attenuation Ad, whose direct measurement is available with dual-...

Marielle Gosset; Henri Sauvageot

1992-10-01T23:59:59.000Z

117

Retrieval of Vertical Profiles of Cirrus Cloud Microphysical Parameters from Doppler Radar and Infrared Radiometer Measurements  

Science Conference Proceedings (OSTI)

This paper describes a new method to retrieve vertical profiles of the parameters of cirrus cloud microphysics that are important for the estimation of climatic feedback. These parameters are the particle characteristic size and ice mass content. ...

S. Y. Matrosov; B. W. Orr; R. A. Kropfli; J. B. Snider

1994-05-01T23:59:59.000Z

118

Vertical Velocity and Buoyancy Characteristics of Coherent Echo Plumes in the Convective Boundary Layer, Detected by a Profiling Airborne Radar  

Science Conference Proceedings (OSTI)

Aircraft and airborne millimeter-wave radar observations are used to interpret the dynamics of radar echoes and radar-inferred updrafts within the well-developed, weakly sheared continental convective boundary layer. Vertically pointing radar ...

Qun Miao; Bart Geerts; Margaret LeMone

2006-06-01T23:59:59.000Z

119

Measurements of Ocean Surface Backscattering Using an Airborne 94-GHz Cloud Radar—Implication for Calibration of Airborne and Spaceborne W-Band Radars  

Science Conference Proceedings (OSTI)

Backscattering properties of the ocean surface have been widely used as a calibration reference for airborne and spaceborne microwave sensors. However, at millimeter-wave frequencies, the ocean surface backscattering mechanism is still not well ...

Lihua Li; Gerald M. Heymsfield; Lin Tian; Paul E. Racette

2005-07-01T23:59:59.000Z

120

The Ability of MM5 to Simulate Ice Clouds: Systematic Comparison between Simulated and Measured Fluxes and Lidar/Radar Profiles at SIRTA Atmospheric Observatory  

SciTech Connect

Ice clouds play a major role in the radiative energy budget of the Earth-atmosphere system (Liou 1986). Their radiative effect is governed primarily by the equilibrium between their albedo and greenhouse effects. Both macrophysical and microphysical properties of ice clouds regulate this equilibrium. For quantifying the effect of these clouds onto climate and weather systems, they must be properly characterized in atmospheric models. In this paper we use remote-sensing measurements from the SIRTA ground based atmospheric observatory (Site Instrumental de Recherche par Teledetection Atmospherique, http://sirta.lmd.polytechnique.fr). Lidar and radar observations taken over 18 months are used, in order to gain statistical confidence in the model evaluation. Along this period of time, 62 days are selected for study because they contain parts of ice clouds. We use the ''model to observations'' approach by simulating lidar and radar signals from MM5 outputs. Other more classical variables such as shortwave and longwave radiative fluxes are also used. Four microphysical schemes, among which that proposed by Reisner et al. (1998) with original or modified parameterizations of particle terminal fall velocities (Zurovac-Jevtic and Zhang 2003, Heymsfield and Donner 1990), and the simplified Dudhia (1989) scheme are evaluated in this study.

Chiriaco, M.; Vautard, R.; Chepfer, H.; Haeffelin, M.; Wanherdrick, Y.; Morille, Y.; Protat, A.; Dudhia, J.

2005-03-18T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Cloud Layers, Particle Identification, and Rain-Rate Profiles from ZRVf Measurements by Clear-Air Doppler Radars  

Science Conference Proceedings (OSTI)

Networks of radars that point almost vertically and continuously measure the vertical profile of the horizontal wind will, in the future, be operated at many locations around the world. Although such radars are designed to measure the Doppler-...

E. E. Gossard; R. G. Strauch; D. C. Welsh; S. Y. Matrosov

1992-04-01T23:59:59.000Z

122

An Atmospheric Radiation Measurement Value-Added Product to Retrieve Optically Thin Cloud Visible Optical Depth using Micropulse Lidar  

Science Conference Proceedings (OSTI)

The purpose of the Micropulse Lidar (MPL) Cloud Optical Depth (MPLCOD) Value-Added Product (VAP) is to retrieve the visible (short-wave) cloud optical depth for optically thin clouds using MPL. The advantage of using the MPL to derive optical depth is that lidar is able to detect optically thin cloud layers that may not be detected by millimeter cloud radar or radiometric techniques. The disadvantage of using lidar to derive optical depth is that the lidar signal becomes attenuation limited when ? approaches 3 (this value can vary depending on instrument specifications). As a result, the lidar will not detect optically thin clouds if an optically thick cloud obstructs the lidar beam.

Lo, C; Comstock, JM; Flynn, C

2006-10-01T23:59:59.000Z

123

Doppler Radar Observations of Mammatus  

Science Conference Proceedings (OSTI)

Observations of mammatus-like cloud features associated with a convective rain shower were obtained using a vertically pointing 8-mm-wavelength Doppler radar. The radar's excellent sensitivity and resolution allowed even very weak, finescale ...

Brooks E. Martner

1995-10-01T23:59:59.000Z

124

Understanding the AIRS, ARM, and MODIS cloud products by cross-comparison  

NLE Websites -- All DOE Office Websites (Extended Search)

Understanding the AIRS, ARM, and MODIS cloud products by cross-comparison Understanding the AIRS, ARM, and MODIS cloud products by cross-comparison Kahn, Brian Jet Propulsion Laboratory Eldering, Annmarie Jet Propulsion Laboratory Category: Cloud Properties We present comparisons of the Atmospheric Infrared Sounder (AIRS) operational cloud top height (CTH) to the active surface-based measurements of the Atmospheric Radiation Measurement (ARM) program sites in the tropical Western Pacific. The agreement is found to be consistent to other comparisons of passive IR-derived CTH from other measurement platforms despite the nominal footprint size of 45 km at nadir view. Independent comparisons of CTH to the millimeter-wave cloud radar at Manus Island and the micropulse lidar at Nauru Island indicate that the CTH retrieved by AIRS is statistically significant at the 5% level or less for cirrus cases

125

Clouds  

NLE Websites -- All DOE Office Websites (Extended Search)

heated by the sun, produces rising columns of air in which the moisture condenses into tall fleecy white clouds At night, when the sky is clear, the earth cools to give those...

126

A comparison of precipitation occurrence from the NCEP StageIV QPE Product and the CloudSat Cloud Profiling Radar  

Science Conference Proceedings (OSTI)

Due to its extensive quality control procedures and uniform space-time grid, the NCEP StageIV merged WSR-88D radar and surface rain gauge dataset is often considered to be the best long-term gridded dataset of precipitation observations covering ...

Mark Smalley; Tristan L’Ecuyer; Matthew Lebsock; John Haynes

127

Evaluation of Cloud-Phase Retrieval Methods for SEVIRI on Meteosat-8 Using Ground-Based Lidar and Cloud Radar Data  

Science Conference Proceedings (OSTI)

Three cloud-phase determination algorithms from passive satellite imagers are explored to assess their suitability for climate monitoring purposes in midlatitude coastal climate zones. The algorithms are the Moderate Resolution Imaging ...

Erwin L. A. Wolters; Robert A. Roebeling; Arnout J. Feijt

2008-06-01T23:59:59.000Z

128

The Microbase Value-Added Product: A Baseline Retrieval of Cloud Microphysical Properties  

SciTech Connect

This report describes the Atmospheric Radiation Measurement (ARM) Climate Research Facility baseline cloud microphysical properties (MICROBASE) value-added product (VAP). MICROBASE uses a combination of millimeter-wavelength cloud radar, microwave radiometer, and radiosonde observations to estimate the vertical profiles of the primary microphysical parameters of clouds including the liquid/ice water content and liquid/ice cloud particle effective radius. MICROBASE is a baseline algorithm designed to apply to most conditions and locations using a single set of parameterizations and a simple determination of water phase based on temperature. This document provides the user of this product with guidelines to assist in determining the accuracy of the product under certain conditions. Quality control flags are designed to identify outliers and indicate instances where the retrieval assumptions may not be met. The overall methodology is described in this report through a detailed description of the input variables, algorithms, and output products.

Dunn, M; Johnson, K; Jensen, M

2011-05-31T23:59:59.000Z

129

The Relation of Radar to Cloud Area-Time Integrals and Implications for Rain Measurements from Space  

Science Conference Proceedings (OSTI)

In this work we determine the relationships between satellite-based and radar-measured area-time integrals (ATI) for convective storms and show how both depend upon the climatological conditional mean rain rate Rc, and the ratio of the measured ...

David Atlas; Thomas L. Bell

1992-09-01T23:59:59.000Z

130

Understanding the Relationships between Lightning, Cloud Microphysics, and Airborne Radar-Derived Storm Structure during Hurricane Karl (2010)  

Science Conference Proceedings (OSTI)

This study explores relationships between lightning, cloud microphysics, and tropical cyclone (TC) storm structure in Hurricane Karl (16 September 2010) using data collected by the NASA DC-8 and Global Hawk (GH) aircraft during NASA’s Genesis and ...

Brad Reinhart; Henry Fuelberg; Richard Blakeslee; Douglas Mach; Andrew Heymsfield; Aaron Bansemer; Stephen L. Durden; Simone Tanelli; Gerald Heymsfield; Bjorn Lambrigtsen

131

Retrieval of Vertical Profiles of Liquid Water and Ice Content in Mixed Clouds from Doppler Radar and Microwave Radiometer Measurements  

Science Conference Proceedings (OSTI)

A new method to retrieve vertical profiles of liquid water content Mw(z), ice water content Mi(z), and ice particle size distribution Ni(D, z), (where D is the ice particle size and z the vertical coordinate) in mixed nonprecipitating clouds ...

Henri Sauvageot

1996-01-01T23:59:59.000Z

132

Comparison of Simulated and Observed Continental Tropical Anvil Clouds and Their Radiative Heating Profiles  

Science Conference Proceedings (OSTI)

Vertically pointing millimeter-wavelength radar observations of anvil clouds extending from mesoscale convective systems (MCSs) that pass over an Atmospheric Radiation Measurement Program (ARM) field site in Niamey, Niger, are compared to anvil structures generated by the Weather Research and Forecasting (WRF) mesoscale model using six different microphysical schemes. The radar data provide the statistical distribution of the radar reflectivity values as a function of height and anvil thickness. These statistics are compared to the statistics of the modeled anvil cloud reflectivity at all altitudes. Requiring the model to be statistically accurate at all altitudes is a stringent test of the model performance. The typical vertical profile of radiative heating in the anvil clouds is computed from the radar observations. Variability of anvil structures from the different microphysical schemes provides an estimate of the inherent uncertainty in anvil radiative heating profiles. All schemes underestimate the optical thickness of thin anvils and cirrus, resulting in a bias of excessive net anvil heating in all of the simulations.

Powell, Scott W.; Houze, R.; Kumar, Anil; McFarlane, Sally A.

2012-09-06T23:59:59.000Z

133

Thunderstorm characteristics of cloud-to-ground lightning at the Kennedy Space Center, Florida: a study of lightning initiation signatures as indicated by Doppler radar  

E-Print Network (OSTI)

A sum-nary of lightning characteristics was developed for the NASA Kennedy Space Center (KSC). From-n a 1989-1996 data set, the spatial patterns, temporal patterns, and first stroke mean peak current were analyzed. Forty five thunderstorms were chosen due to their isolated development over KSC. Forty of the storms representing summer (May through September) airmass thunderstorms and five storms representing winter were examined for their storms-n initiation characteristics. Radar reflectivity echoes at the -10 C,-15 C, and-20 C temperature heights were associated with cloud-to-ground (CG) lightning strike locations from the National Lightning Detection Network. A distinct region of high ground flash densities can be seen over land matching the topography of the KSC coastline. A maximum of values was observed during the summer months for both negative and positive flashes. The absolute i-magnitude of negative peak currents was found to be higher than positive peak currents in Florida. Although thunderstorms can Occur at any time during the day, the diurnal distribution of lightning flashes showed that the afternoon (2000-2200 UTC) was the time of maximum lightning activity. From a time history of radar-echoes, it was found that the 30 dBZ echo detected at the-I 5'C temperature height is the best indicator of the beginning of CG lightning activity. The observed median lag time between this lightning initiation signature and the beginning of CG lightning flashes was 15.5 minutes. Other lightning initiation signatures were also examined at all three temperature heights and did not yield as successful results.

Gremillion, Michael Shane

1998-01-01T23:59:59.000Z

134

Definition: Interferometric Synthetic Aperture Radar | Open Energy  

Open Energy Info (EERE)

Interferometric Synthetic Aperture Radar Interferometric Synthetic Aperture Radar Jump to: navigation, search Dictionary.png Interferometric Synthetic Aperture Radar Interferometric Synthetic Aperture Radar (InSAR) utilizes SAR images from two different time periods to generate maps of surface deformation. The technique can potentially measure millimeter-scale changes in the Earth's surface.[1][2] View on Wikipedia Wikipedia Definition Also Known As InSAR, IfSAR Related Terms Synthetic Aperture Radar, radar, sustainability References ↑ Synthetic Aperture Radar Interferometry to Measure Earth's Surface Topography and Its Deformation (Burgmann et al. 2000) ↑ Improved Visulaization of Satellite Radar InSAR Observed Structural Controls at Producing Geothermal Field Using Modeled Horizontal Surface Displacements(Opplinger et al. 2006)

135

Global Precipitation Retrievals Using the NOAA AMSU Millimeter-Wave Channels: Comparisons with Rain Gauges  

E-Print Network (OSTI)

A surface-precipitation-rate retrieval algorithm for 13-channel Advanced Microwave Sounding Unit (AMSU) millimeter-wave spectral observations from 23 to 191 GHz is described. It was trained using cloud-resolving fifth-generation ...

Surussavadee, Chinnawat

136

Stratocumulus Liquid Water Content from Dual-Wavelength Radar  

Science Conference Proceedings (OSTI)

A technique is described to retrieve stratocumulus liquid water content (LWC) using the differential attenuation measured by vertically pointing radars at 35 and 94 GHz. Millimeter-wave attenuation is proportional to LWC and increases with ...

Robin J. Hogan; Nicolas Gaussiat; Anthony J. Illingworth

2005-08-01T23:59:59.000Z

137

ARM - Midlatitude Continental Convective Clouds Experiment (MC3E): Multi-Frequency Profilers, S-band Radar (williams-s_band)  

DOE Data Explorer (OSTI)

This data was collected by the NOAA 449-MHz and 2.8-GHz profilers in support of the Department of Energy (DOE) and NASA sponsored Mid-latitude Continental Convective Cloud Experiment (MC3E). The profiling radars were deployed in Northern Oklahoma at the DOE Atmospheric Radiation Mission (ARM) Southern Great Plans (SGP) Central Facility from 22 April through 6 June 2011. NOAA deployed three instruments: a Parsivel disdrometer, a 2.8-GHz profiler, and a 449-MHz profiler. The parasivel provided surface estimates of the raindrop size distribution and is the reference used to absolutely calibrate the 2.8 GHz profiler. The 2.8-GHz profiler provided unattenuated reflectivity profiles of the precipitation. The 449-MHz profiler provided estimates of the vertical air motion during precipitation from near the surface to just below the freezing level. By using the combination of 2.8-GHz and 449-MHz profiler observations, vertical profiles of raindrop size distributions can be retrieved. The profilers are often reference by their frequency band: the 2.8-GHz profiler operates in the S-band and the 449-MHz profiler operates in the UHF band. The raw observations are available as well as calibrated spectra and moments. This document describes how the instruments were deployed, how the data was collected, and the format of the archived data.

Christopher Williams

138

EnKF Assimilation of High-Resolution, Mobile Doppler Radar Data of the 4 May 2007 Greensburg, Kansas, Supercell into a Numerical Cloud Model  

Science Conference Proceedings (OSTI)

Mobile Doppler radar data, along with observations from a nearby Weather Surveillance Radar-1988 Doppler (WSR-88D), are assimilated with an ensemble Kalman filter (EnKF) technique into a nonhydrostatic, compressible numerical weather prediction ...

Robin L. Tanamachi; Louis J. Wicker; David C. Dowell; Howard B. Bluestein; Daniel T. Dawson II; Ming Xue

2013-02-01T23:59:59.000Z

139

Arctic Cloud Characteristics as Derived from MODIS, CALIPSO, and CloudSat  

Science Conference Proceedings (OSTI)

The Moderate Resolution Imaging Spectroradiometer (MODIS), Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP), and CloudSat Cloud Profiling Radar (CPR) set of sensors, all in the Afternoon Constellation (A-Train), has been regarded as among ...

Mark Aaron Chan; Josefino C. Comiso

2013-05-01T23:59:59.000Z

140

Utilizing Spaceborne Radars to Retrieve Dry Snowfall  

Science Conference Proceedings (OSTI)

A dataset consisting of one year of CloudSat Cloud Profiling Radar (CPR) near-surface radar reflectivity Z associated with dry snowfall is examined in this study. The CPR observations are converted to snowfall rates S using derived Ze–S ...

Mark S. Kulie; Ralf Bennartz

2009-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Simulating Range Oversampled Doppler Radar Profiles of Inhomogeneous Targets  

Science Conference Proceedings (OSTI)

A new technique for generating range oversampled profiles of Doppler radar signals that have been backscattered by distributed targets is presented in this paper. The technique was developed for spaceborne cloud radars, but it can just as well be ...

N. A. J. Schutgens

2008-09-01T23:59:59.000Z

142

Can a VHF Doppler Radar Provide Synoptic Wind Data? A Comparison of 30 Days of Radar and Radiosonde Data  

Science Conference Proceedings (OSTI)

A number of experiments have shown that UHF and VHF Doppler radars can make “clear air” wind measurements in the troposphere and lower stratosphere, even in the presence of clouds and precipitation. Past comparisons of radar and rawinsonde ...

Miguel Folkmar Larsen

1983-10-01T23:59:59.000Z

143

Midlatitude Continental Convective Clouds Experiment Science...  

NLE Websites -- All DOE Office Websites (Extended Search)

aircraft will fly above and within the clouds while radar systems scan through the storm from multiple locations. At the same time, additional ground-based instruments will...

144

Boundary Layer and Cloud Structure Controls on Tropical Low Cloud Cover Using A-Train Satellite Data and ECMWF Analyses  

Science Conference Proceedings (OSTI)

The Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO), CloudSat radar, and the Moderate Resolution Imaging Spectroradiometer (MODIS) cloud data on the A-Train constellation complemented with the European Centre for ...

Terence L. Kubar; Duane E. Waliser; J-L. Li

2011-01-01T23:59:59.000Z

145

Observations of Ice Crystal Habits with a Scanning Polarimetric W-Band Radar at Slant Linear Depolarization Ratio Mode  

Science Conference Proceedings (OSTI)

Scanning polarimetric W-band radar data were evaluated for the purpose of identifying predominant ice hydrometeor habits. Radar and accompanying cloud microphysical measurements were conducted during the Storm Peak Laboratory Cloud Property ...

Sergey Y. Matrosov; Gerald G. Mace; Roger Marchand; Matthew D. Shupe; Anna G. Hallar; Ian B. McCubbin

2012-08-01T23:59:59.000Z

146

High-Repetition Millimeter-Wave Passive Remote Sensing of Humidity and Hydrometeor Profiles from Elliptical Orbit Constellations  

Science Conference Proceedings (OSTI)

The potential of an elliptical-orbit Flower Constellation of Millimeter-Wave Radiometers (FLORAD) for humidity profile and precipitating cloud observations is analyzed and discussed. The FLORAD mission scientific requirements are aimed at the ...

Frank S. Marzano; Domenico Cimini; Tommaso Rossi; Daniele Mortari; Sabatino Di Michele; Peter Bauer

2010-07-01T23:59:59.000Z

147

Testing IWC Retrieval Methods Using Radar and Ancillary Measurements with In Situ Data  

Science Conference Proceedings (OSTI)

Vertical profiles of ice water content (IWC) can now be derived globally from spaceborne cloud satellite radar (CloudSat) data. Integrating these data with Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) data may ...

Andrew J. Heymsfield; Alain Protat; Dominique Bouniol; Richard T. Austin; Robin J. Hogan; Julien Delanoë; Hajime Okamoto; Kaori Sato; Gerd-Jan van Zadelhoff; David P. Donovan; Zhien Wang

2008-01-01T23:59:59.000Z

148

The Interaction of Clouds and Dry Air in the Eastern Tropical Pacific  

Science Conference Proceedings (OSTI)

Cloud radar observations of eastern Pacific intertropical convergence zone cloud vertical structure are interpreted in light of soundings, 100-km-scale divergence profiles calculated from precipitation radar Doppler velocities, and surface rain ...

Paquita Zuidema; Brian Mapes; Jialin Lin; Chris Fairall; Gary Wick

2006-09-01T23:59:59.000Z

149

Precipitation Forecasting Using Doppler Radar Data, a Cloud Model with Adjoint, and the Weather Research and Forecasting Model: Real Case Studies during SoWMEX in Taiwan  

Science Conference Proceedings (OSTI)

The quantitative precipitation forecast (QPF) capability of the Variational Doppler Radar Analysis System (VDRAS) is investigated in the Taiwan area, where the complex topography and surrounding oceans pose great challenges to accurate rainfall ...

Sheng-Lun Tai; Yu-Chieng Liou; Juanzhen Sun; Shao-Fan Chang; Min-Chao Kuo

2011-12-01T23:59:59.000Z

150

BNL | Cloud Lifecycle Infrastructure  

NLE Websites -- All DOE Office Websites (Extended Search)

Cloud Life Cycle Infrastructure Cloud Life Cycle Infrastructure An important component of any long-term atmospheric measurement program is the quality control and maintenance of the datastreams from instrument systems. Further, the raw measurements from atmospheric remote sensing instrumentation are not directly useable by the majority of the scientific community. These raw measurements must be interpreted and converted to geophysical quantities that can be more readily used by a greater number of scientists to address important questions regarding the Earth's climate system. The cloud life cycle infrastructure group at BNL is led by Dr. Michael Jensen and is responsible for the development and production of cloud-related value-added products (VAPs). The cloud life cycle infrastructure group also provides mentorships for the millimeter cloud

151

ARM - Measurement - Radar polarization  

NLE Websites -- All DOE Office Websites (Extended Search)

polarization polarization ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Radar polarization The temporal and geometric behavior of the electric field vector of an electromagnetic wave transmitted or received by a radar system, e.g. elliptical polarization, differential reflectivity, phase shift, co-polar correlation coefficient, linear depolarization ratio. Categories Cloud Properties Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments CSAPR : C-Band ARM Precipitation Radar

152

Identification of Hydrometeors with Elliptical and Linear Polarization Ka-Band Radar  

Science Conference Proceedings (OSTI)

Polarimetric radar can be used to identify various types of hydrometeors. Ice crystals of the varied growth habits depolarize and backscatter millimeter-wavelength radiation according to crystal aspect ratio, bulk density, and orientation, and ...

Roger F. Reinking; Sergey Y. Matrosov; Roelof T. Bruintjes; Brooks E. Martner

1997-04-01T23:59:59.000Z

153

Droplet Growth in Warm Water Clouds Observed by the A-Train. Part II: A Multisensor View  

Science Conference Proceedings (OSTI)

Hydrometeor droplet growth processes are inferred from a combination of Aqua/Moderate Resolution Imaging Spectroradiometer (MODIS) cloud particle size observations and CloudSat/Cloud Profiling Radar (CPR) observations of warm water clouds. This ...

Takashi Y. Nakajima; Kentaroh Suzuki; Graeme L. Stephens

2010-06-01T23:59:59.000Z

154

The Distribution of Rainfall over Oceans from Spaceborne Radars  

Science Conference Proceedings (OSTI)

A combination of rainfall estimates from the 13.8-GHz Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) and the 94-GHz CloudSat Cloud Profiling Radar (CPR) is used to assess the distribution of rainfall intensity over tropical ...

Wesley Berg; Tristan L’Ecuyer; John M. Haynes

2010-03-01T23:59:59.000Z

155

Dynamical and Microphysical Retrieval from Doppler Radar Observations Using a Cloud Model and Its Adjoint. Part I: Model Development and Simulated Data Experiments  

Science Conference Proceedings (OSTI)

The purpose of the research reported in this paper is to develop a variational data analysis system that can be used to assimilate data from one or more Doppler radars. In the first part of this two-part study, the technique used in this analysis ...

Juanzhen Sun; N. Andrew Crook

1997-06-01T23:59:59.000Z

156

A Bootstrap Technique for Testing the Relationship between Local-Scale Radar Observations of Cloud Occurrence and Large-Scale Atmospheric Fields  

Science Conference Proceedings (OSTI)

A classification scheme is created to map the synoptic-scale (large scale) atmospheric state to distributions of local-scale cloud properties. This mapping is accomplished by a neural network that classifies 17 months of synoptic-scale initial ...

Roger Marchand; Nathaniel Beagley; Sandra E. Thompson; Thomas P. Ackerman; David M. Schultz

2006-11-01T23:59:59.000Z

157

Enhanced Radar Backscattering due to Oriented Ice Particles at 95 GHz during StormVEx  

Science Conference Proceedings (OSTI)

Nonspherical atmospheric ice particles can enhance radar backscattering and attenuation above that expected from spheres of the same mass. An analysis of scanning 95 GHz radar data collected during the Storm Peak Laboratory cloud property ...

Roger Marchand; Gerald G. Mace; A. Gannet Hallar; Ian B. McCubbin; Sergey Y. Matrosov; Matthew D. Shupe

158

Detection of Ice Hydrometeor Alignment Using an Airborne W-band Polarimetric Radar  

Science Conference Proceedings (OSTI)

This paper presents airborne W-band polarimetric radar measurements at horizontal and vertical incidence on ice clouds using a 95-GHz radar on the University of Wyoming King Air research aircraft. Coincident, in situ measurements from probes on ...

J. Galloway; A. Pazmany; J. Mead; R. E. McIntosh; D. Leon; J. French; R. Kelly; G. Vali

1997-02-01T23:59:59.000Z

159

Observations of a Colorado Tornado. Part II: Combined Photogrammetric and Doppler Radar Analysis  

Science Conference Proceedings (OSTI)

An integrated analysis of photographic and Doppler radar observations of a tornadic storm during the Convection Initiation and Downburst Experiment (CINDE) is presented. High-resolution single-Doppler radar measurements are combined with cloud ...

Roger M. Wakimoto; Brooks E. Martner

1992-04-01T23:59:59.000Z

160

Observations of the Small-Scale Variability of Precipitation Using an Imaging Radar  

Science Conference Proceedings (OSTI)

For many years, spatial and temporal inhomogeneities in precipitation fields have been studied using scanning radars, cloud radars, and disdrometers, for example. Each measurement technique has its own advantages and disadvantages. Conventional ...

Robert D. Palmer; Boon Leng Cheong; Michael W. Hoffman; Stephen J. Frasier; F. J. López-Dekker

2005-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Simulating Arctic mixed-phase clouds: Sensitivity to environmental...  

NLE Websites -- All DOE Office Websites (Extended Search)

as well as aggregates to precipitation fluxes and radar reflectivity. Observations of icewater drop size distributions, cloud phase, etc., allow us to constrain model...

162

APPLICATIONS Millimeter-Wave Radar Detection of Chemicals,  

E-Print Network (OSTI)

standoff/remote detection Mobile detection of chemical or nuclear proliferation for treaty verification managed by The University of Chicago For non-DHS inquiries, contact: Paul Raptis Argonne National

Kemner, Ken

163

Mesoscale and Microscale Structure of Cirrus Clouds: Three Case Studies  

Science Conference Proceedings (OSTI)

The structure and composition of three basic cirrus cloud types are examined through coordinated aircraft and ground-based polarization lidar and radar measurements. The cloud systems consist of a multilayered orographic cirrus, a 6-km deep ...

Kenneth Sassen; David O'C. Starr; Taneil Uttal

1989-02-01T23:59:59.000Z

164

The Structure of Thermals in Cumulus from Airborne Dual-Doppler Radar Observations  

Science Conference Proceedings (OSTI)

A newly developed technique for airborne dual-Doppler observations with the Wyoming Cloud Radar is used to characterize the velocity fields in vertical planes across cumulus turrets. The clouds sampled were continental in nature, with high bases (...

Rick Damiani; Gabor Vali; Samuel Haimov

2006-05-01T23:59:59.000Z

165

Millimeter-wave active probe  

DOE Patents (OSTI)

A millimeter-wave active probe for use in injecting signals with frequencies above 50GHz to millimeter-wave and ultrafast devices and integrated circuits including a substrate upon which a frequency multiplier consisting of filter sections and impedance matching sections are fabricated in uniplanar transmission line format. A coaxial input and uniplanar 50 ohm transmission line couple an approximately 20 GHz input signal to a low pass filter which rolls off at approximately 25 GHz. An input impedance matching section couples the energy from the low pass filter to a pair of matched, antiparallel beam lead diodes. These diodes generate odd-numberd harmonics which are coupled out of the diodes by an output impedance matching network and bandpass filter which suppresses the fundamental and third harmonics and selects the fifth harmonic for presentation at an output.

Majidi-Ahy, Gholamreza (Sunnyvale, CA); Bloom, David M. (Portola Valley, CA)

1991-01-01T23:59:59.000Z

166

Automatic Detection of Wind Turbine Clutter for Weather Radars  

Science Conference Proceedings (OSTI)

Wind turbines cause contamination of weather radar signals that is often detrimental and difficult to distinguish from cloud returns. Because the turbines are always at the same location, it would seem simple to identify where wind turbine ...

Kenta Hood; Sebastián Torres; Robert Palmer

2010-11-01T23:59:59.000Z

167

Millimeter Wave Sensors for Clean Energy  

Science Conference Proceedings (OSTI)

Millimeter wave sensor data on refractory used for clean coal gasification will also be presented. Future applications in the area of clean energy will be ...

168

ARM - Publications: Science Team Meeting Documents  

NLE Websites -- All DOE Office Websites (Extended Search)

This comparison focuses primarily on differences in cloud base height and percentage clear sky that are reported by the Micropulse Lidar (MPL), Millimeter Cloud Radar...

169

Science Goals for the ARM Recovery Act Radars  

SciTech Connect

Science Goals for the ARM Recovery Act Radars. In October 2008, an ARM workshop brought together approximately 30 climate research scientists to discuss the Atmospheric Radiation Measurement (ARM) Climate Research Facility's role in solving outstanding climate science issues. Through this discussion it was noted that one of ARM's primary contributions is to provide detailed information about cloud profiles and their impact on radiative fluxes. This work supports cloud parameterization development and improved understanding of cloud processes necessary for that development. A critical part of this work is measuring microphysical properties (cloud ice and liquid water content, cloud particle sizes, shapes, and distribution). ARM measurements and research have long included an emphasis on obtaining the best possible microphysical parameters with the available instrumentation. At the time of the workshop, this research was reaching the point where additional reduction in uncertainties in these critical parameters required new instrumentation for applications such as specifying radiative heating profiles, measuring vertical velocities, and studying the convective triggering and evolution of three-dimensional (3D) cloud fields. ARM was already operating a subset of the necessary instrumentation to make some progress on these problems; each of the ARM sites included (and still includes) a cloud radar (operating at 35 or 94 GHz), a cloud lidar, and balloon-borne temperature and humidity sensors. However, these measurements were inadequate for determining detailed microphysical properties in most cases. Additional instrumentation needed to improve retrievals of microphysical processes includes radars at two additional frequencies for a total of three at a single site (35 GHz, 94 GHz, and a precipitation radar) and a Doppler lidar. Evolving to a multi-frequency scanning radar is a medium-term goal to bridge our understanding of two-dimensional (2D) retrievals to the 3D cloud field. These additional microphysical measurements would allow detailed cloud properties to be derived even in the presence of light precipitation. It is important to couple these detailed measurements of cloud microphysics to vertical motion on the cloud scale to couple microphysics with meteorological processes. Vertically pointing Doppler radars provide the vertical motion of cloud particles but, to separate particle motion from air motion, a wind profiler is required. The American Recovery and Reinvestment Act provided the means to address these needs and implement a multi-frequency suite of radars, including scanning radars, at each of the ARM sites. In addition, Doppler lidars have been deployed at several sites. With these new measurement capabilities, ARM has the measurement capabilities to tackle the problems of improving microphysical profile descriptions and evaluating the relationship between our current narrow-field-of view, zenith perspective on clouds to a description of the full 3D cloud field and its temporal evolution.

JH Mather

2012-05-29T23:59:59.000Z

170

3. New Cloud Climatology  

NLE Websites -- All DOE Office Websites (Extended Search)

New Cloud Climatology New Cloud Climatology Computed for the summers (May-Au- gust) 2000 through 2004 (Berg and Kassianov 2008). Uses ARSCL VAP, Total Sky Imager, and radar wind profiler. * * Initial Evaluation of the Cumulus Potential Scheme at the ACRF SGP Site Larry Berg, William Gustafson, and Evgueni Kassianov Pacific Northwest National Laboratory 1. Motivation Shallow clouds are poorly predicted by current global and regional scale models. A new parameterization has been devel- oped that links the boundary-layer turbu- lence and the shallow clouds. 2. The CuP Parameterization The Cumulus Potential (CuP) param- eterization uses Probability Density Functions (PDFs) of temperature and moisture to represent the subgrid scale

171

Retail beamed power using millimeter waves: Survey  

Science Conference Proceedings (OSTI)

Retail delivery of electric power through millimeter waves is relevant in developing areas where the market for communication devices outpaces the power grid infrastructure. It is also a critical component of an evolutionary path towards terrestrial ... Keywords: Micro renewable energy systems, millimeter wave, power beaming, rural India power, space power grid, systems

Narayanan Komerath; Aravinda Kar

2012-08-01T23:59:59.000Z

172

Determination of 3-D Cloud Ice Water Contents by Combining Multiple...  

NLE Websites -- All DOE Office Websites (Extended Search)

Determination of 3-D Cloud Ice Water Contents by Combining Multiple Data Sources from Satellite, Ground Radar, and a Numerical Model Liu, Guosheng Florida State University Seo,...

173

An Integrated Approach toward Retrieving Physically Consistent Profiles of Temperature, Humidity, and Cloud Liquid Water  

Science Conference Proceedings (OSTI)

A method is presented for deriving physically consistent profiles of temperature, humidity, and cloud liquid water content. This approach combines a ground-based multichannel microwave radiometer, a cloud radar, a lidar-ceilometer, the nearest ...

Ulrich Löhnert; Susanne Crewell; Clemens Simmer

2004-09-01T23:59:59.000Z

174

Detection of Fog and Low Cloud Boundaries with Ground-Based Remote Sensing Systems  

Science Conference Proceedings (OSTI)

The performance of the boundary determination of fog and low stratiform cloud layers with data from a frequency-modulated continuous-wave (FMCW) cloud radar and a Vaisala ceilometer is assessed. During wintertime stable episodes, fog and low ...

Daniela Nowak; Dominique Ruffieux; Judith L. Agnew; Laurent Vuilleumier

2008-08-01T23:59:59.000Z

175

Variability of Microphysical Parameters in High-Altitude Ice Clouds: Results of the Remote Sensing Method  

Science Conference Proceedings (OSTI)

The remote sensing method for retrieving vertical profiles of microphysical parameters in ice clouds from ground-based measurements taken by the Doppler radar and IR radiometer was applied to several cloud cases observed during different field ...

Sergey Y. Matrosov

1997-06-01T23:59:59.000Z

176

Observations and Model Simulations of Transport and Precipitation Development in a Seeded Cumulus Congestus Cloud  

Science Conference Proceedings (OSTI)

Observations made by three instrumented aircraft, a Doppler radar, and other data sources were used to follow the initiation and development of precipitation in a small cumulus congestus cloud. The cloud was seeded at its base using an airborne ...

Michael W. Huston; Andrew G. Detwiler; Fred J. Kopp; Jeffrey L. Stith

1991-10-01T23:59:59.000Z

177

Multiyear Evaluations of a Cloud Model Using ARM Data  

Science Conference Proceedings (OSTI)

This work uses long-term lidar and radar retrievals of the vertical structure of cloud at the Atmospheric Radiation Measurement (ARM) program’s Southern Great Plains site to evaluate cloud occurrence in multiyear runs of a cloud system–resolving ...

Peter W. Henderson; Robert Pincus

2009-09-01T23:59:59.000Z

178

Title: Radar-observed convective characteristics during TWP-ICE  

NLE Websites -- All DOE Office Websites (Extended Search)

Title: Radar-observed convective characteristics during TWP-ICE Title: Radar-observed convective characteristics during TWP-ICE Schumacher, Courtney Texas A&M University Houze, Robert University of Washington May, Peter Bureau or Meteorology Research Centre Frederick, Kaycee Cetrone, Jasmine Vallgren, Andreas Category: Field Campaigns This poster will describe the radar dataset obtained in the Tropical Warm Pool International Cloud Experiment (TWP-ICE), which is to take place 20 January - 14 February 2006 in the vicinity of Darwin, Australia. We will describe the convective systems observed during the project by two scanning C-band Doppler radars, one of which will provide dual-polarization measurements, and ARM's vertically pointing cloud radar and lidar installations. In addition, we will discuss the potential for combining

179

Passive Fully Polarimetric W-Band Millimeter-Wave Imaging  

Science Conference Proceedings (OSTI)

We present the theory, design, and experimental results obtained from a scanning passive W-band fully polarimetric imager. Passive millimeter-wave imaging offers persistent day/nighttime imaging and the ability to penetrate dust, clouds and other obscurants, including clothing and dry soil. The single-pixel scanning imager includes both far-field and near-field fore-optics for investigation of polarization phenomena. Using both fore-optics, a variety of scenes including natural and man-made objects was imaged and these results are presented showing the utility of polarimetric imaging for anomaly detection. Analysis includes conventional Stokes-parameter based approaches as well as multivariate image analysis methods.

Bernacki, Bruce E.; Kelly, James F.; Sheen, David M.; McMakin, Douglas L.; Tedeschi, Jonathan R.; Harris, Robert V.; Mendoza, Albert; Hall, Thomas E.; Hatchell, Brian K.; Valdez, Patrick LJ

2012-04-01T23:59:59.000Z

180

IC cloud: Enabling compositional cloud  

Science Conference Proceedings (OSTI)

Cloud computing has attracted great interest from both academic and industrial communities. Different paradigms, architectures and applications based on the concept of cloud have emerged. Although many of them have been quite successful, efforts are ... Keywords: Cloud computing, cloud elasticity, cloud service, compositional cloud, infrastructure as a service (IaaS)

Yi-Ke Guo; Li Guo

2011-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Sampling Errors and Bias in Satellite-Derived Fractional Cloud Cover Estimates from Exponential and Deterministic Cloud Fields as a Consequence of Instrument Pixel Size and Number  

Science Conference Proceedings (OSTI)

The proposed European Space Agency’s cloud profiling radar Millimetre Active Cloud Structure Imaging Mission is a nadir-pointing radar with a 1-km footprint; it will need to integrate the received signal power for a reasonable amount of time (1.4–...

Ivan Astin

1997-10-01T23:59:59.000Z

182

Using Doppler spectra to separate hydrometeor populations and analyze ice precipitation in multilayered mixed-phase clouds  

SciTech Connect

Multimodality of cloud radar Doppler spectra is used to partition cloud particle phases and to separate distinct ice populations in the radar sample volume, thereby facilitating analysis of individual ice showers in multilayered mixed-phase clouds. A 35-GHz cloud radar located at Barrow, Alaska, during the Mixed-Phase Arctic Cloud Experiment collected the Doppler spectra. Data from a pair of collocated depolarization lidars confirmed the presence of two liquid cloud layers reported in this study. Surprisingly, both of these cloud layers were embedded in ice precipitation yet maintained their liquid. Our spectral separation of the ice precipitation yielded two distinct ice populations: ice initiated within the two liquid cloud layers and ice precipitation formed in higher cloud layers. Comparisons of ice fall velocity versus radar reflectivity relationships derived for distinct showers reveal that a single relationship might not properly represent the ice showers during this period.

Rambukkange, Mahlon P.; Verlinde, J.; Eloranta, E. W.; Flynn, Connor J.; Clothiaux, Eugene E.

2011-01-31T23:59:59.000Z

183

Estimating Three-Dimensional Cloud Structure via Statistically Blended Satellite Observations  

Science Conference Proceedings (OSTI)

The launch of the NASA CloudSat in April 2006 enabled the first satellite-based global observation of vertically-resolved cloud information. However, CloudSat’s non-scanning W-band (94 GHz) Cloud Profiling Radar (CPR) provides only a nadir cross-...

Steven D. Miller; John M. Forsythe; Philip T. Partain; John M. Haynes; Richard L. Bankert; Manajit Sengupta; Cristian Mitrescu; Jeffrey D. Hawkins; Thomas H. Vonder Haar

184

Measurements and Simulations of Nadir-Viewing Radar Returns from the Melting Layer at X and W Bands  

Science Conference Proceedings (OSTI)

Simulated radar signatures within the melting layer in stratiform rain—namely, the radar bright band—are checked by means of comparisons with simultaneous measurements of the bright band made by the ER-2 Doppler radar (EDOP; X band) and Cloud ...

Liang Liao; Robert Meneghini; Lin Tian; Gerald M. Heymsfield

2009-11-01T23:59:59.000Z

185

ARM - Field Campaign - 2001 Multi-Frequency Radar IOP  

NLE Websites -- All DOE Office Websites (Extended Search)

govCampaigns2001 Multi-Frequency Radar IOP govCampaigns2001 Multi-Frequency Radar IOP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : 2001 Multi-Frequency Radar IOP 2001.03.01 - 2001.09.30 Lead Scientist : Stephen Sekelsky Data Availability http://abyss.ecs.umass.edu For data sets, see below. Summary Install UMass and NOAA Aeronomy Laboratory "guest instrument" radars at the SGP CART site adjacent to the MMCR system. Both the UMass and NOAA Aeronomy Laboratory systems will run autonomously for approximately a six month period. Description Scientific hypothesis: A. Measurements from the University of Massachusetts (UMass) Cloud Profiling Radar System (CPRS) - 95/33 GHz Radar indicate that the 95 GHz channel is much less sensitive to insect clutter than the 35 GHz channel by

186

Artificial Cloud Seeding Using Liquid Carbon Dioxide: Comparisons of Experimental Data and Numerical Analyses  

Science Conference Proceedings (OSTI)

An artificial seeding experiment was carried out over the Genkai Sea, Japan, using liquid carbon dioxide. The seeded cloud was followed by an aircraft and radar at Kyushu University. A radar-echo intensity of 19 dBZ was formed in the seeded cloud ...

Jinichiro Seto; Kikuro Tomine; Kenji Wakimizu; Koji Nishiyama

2011-07-01T23:59:59.000Z

187

Observations of a Cloud Are Triggered by Thunderstorm Outflow  

Science Conference Proceedings (OSTI)

This paper presents aircraft, radar, satellite and rawinsonde observations which describe a cloud am formed by moist downdraft outflow from a cumulonimbus cluster in northwest Kansas. Aircraft cross sections are presented of four variables at 160 ...

David A. Matthews

1981-10-01T23:59:59.000Z

188

Dynamical and Microphysical Characteristics of Arctic Clouds during BASE  

Science Conference Proceedings (OSTI)

In this study, observations from aircraft, Doppler radar, and LANDSAT are used to better understand dynamical and microphysical characteristics of low-level Arctic clouds for climate change studies. Observations during the Beaufort and Arctic ...

I. Gultepe; G. Isaac; D. Hudak; R. Nissen; J. W. Strapp

2000-04-01T23:59:59.000Z

189

arm_stm_2007_revercomb_poster_cloud.ppt  

NLE Websites -- All DOE Office Websites (Extended Search)

Assessment Part 2: Cirrus Radiative Flux Study Using RadarLidarAERI Derived Cloud Properties David Tobin, Lori Borg, David Turner, Robert Holz, Daniel DeSlover, Hank Revercomb,...

190

Cirrus Clouds and the Large-Scale Atmospheric State: Relationships Revealed by Six Years of Ground-Based Data  

Science Conference Proceedings (OSTI)

The properties of cirrus clouds observed at the Atmospheric Radiation Measurement (ARM) Climate Research Facility (ACRF) in Oklahoma are documented from a nearly continuous 6-yr record of 35-GHz cloud radar data. Cirrus frequency over the ACRF is ...

Gerald G. Mace; Sally Benson; Erik Vernon

2006-07-01T23:59:59.000Z

191

Detection of Nonprecipitating Clouds with the WSR-88D: A Theoretical and Experimental Survey of Capabilities and Limitations  

Science Conference Proceedings (OSTI)

Theoretical calculations and experiments verify that the National Weather Service WSR-88D radars have the sensitivity to detect nonprecipitating clouds, but show that significant obstacles impair the generality of this cloud sensing technique. ...

Mark A. Miller; Johannes Verlinde; Craig V. Gilbert; Gregory J. Lehenbauer; Jeffrey S. Tongue; Eugene E. Clothiaux

1998-12-01T23:59:59.000Z

192

Anvil Characteristics as Seen by C-POL during the Tropical Warm Pool International Cloud Experiment (TWP-ICE)  

Science Conference Proceedings (OSTI)

The Tropical Pacific Warm Pool International Cloud Experiment (TWP-ICE) took place in Darwin, Australia, in early 2006. C-band radar data were used to characterize tropical anvil (i.e., thick, nonprecipitating cloud associated with deep ...

Kaycee Frederick; Courtney Schumacher

2008-01-01T23:59:59.000Z

193

The millimeter VLBI Properties of EGRET Blazars  

E-Print Network (OSTI)

We give a progress report on a snapshot 86 GHz-VLBI survey of the EGRET blazars with the observatories of the CMVA. A high fraction (17/18) of the EGRET blazars were detected on the Pico Veleta-Onsala baseline with a baseline length on the order of 500 $M\\lambda$. The detection threshold on the Pico Veleta-Onsala baseline was $\\sim 0.2$ Jy. Six of these sources were not previously detected with 3-millimeter VLBI. We also present the detection of three new non-EGRET sources. The high detection rate for EGRET sources indicates that gamma-ray flux is a robust predictor of millimeter wavelength intensity. Future more sensitive high-energy gamma-ray experiments should find a larger class of objects detectable with millimeter wavelength VLBI.

Geoffrey C. Bower

1999-08-13T23:59:59.000Z

194

Towards a Characterization of Arctic Mixed-Phase Clouds  

NLE Websites -- All DOE Office Websites (Extended Search)

Towards a Characterization of Arctic Mixed-Phase Clouds Towards a Characterization of Arctic Mixed-Phase Clouds Shupe, Matthew CIRES/NOAA/ETL Kollias, Pavlos Brookhaven National Laboratory Category: Cloud Properties Mixed-phase clouds play a unique role in the Arctic, where the delicate balance of phases in these clouds can have a profound impact on the surface radiation balance and various cloud-atmosphere-radiation-surface feedback processes. A better understanding of these clouds is clearly important and has been a recent objective of the ARM program. To this end, multiple sensors including radar, lidar, and temperature soundings, have been utilized in an automated cloud type classification scheme for clouds observed at the North Slope of Alaska site. The performance of this new algorithm at identifying mixed-phase cloud conditions is compared with an

195

Automated Invariant Alignment to Improve Canonical Variates in Image Fusion of Satellite and Weather Radar Data  

Science Conference Proceedings (OSTI)

Canonical correlation analysis (CCA) maximizes the correlation between two sets of multivariate data. CCA is applied to multivariate satellite data and univariate radar data to produce a subspace descriptive of heavily precipitating clouds. A ...

Jacob S. Vestergaard; Allan A. Nielsen

2013-03-01T23:59:59.000Z

196

Evaluation of Radar Multiple-Scattering Effects from a GPM Perspective. Part II: Model Results  

Science Conference Proceedings (OSTI)

Multiple-scattering effects as sensed by radars in configurations useful in the context of the Global Precipitation Mission (GPM) are evaluated for a range of meteorological profiles extracted from four different cloud-resolving model ...

A. Battaglia; M. O. Ajewole; C. Simmer

2006-12-01T23:59:59.000Z

197

A Framework for the Statistical Analysis of Large Radar and Lightning Datasets: Results from STEPS 2000  

Science Conference Proceedings (OSTI)

A framework for the statistical analysis of large radar and lightning datasets is described and implemented in order to analyze two research questions in atmospheric electricity: storms dominated by positive cloud-to-ground (+CG) lightning and ...

Timothy J. Lang; Steven A. Rutledge

2011-08-01T23:59:59.000Z

198

Retrieval of Atmospheric Parameters from Hydrometeor Backscatter Measured with Doppler Radar Profiler  

Science Conference Proceedings (OSTI)

The evaluation of backscatter spectra of clouds and precipitation measured with Doppler radar profilers allows the retrieval of a number of important atmospheric parameters. This retrieval leads to inaccurate results if vertical wind parameters ...

Dirk Klugmann

2001-01-01T23:59:59.000Z

199

Predictor Variables of the Maximum Radar Echo Activity on Convective Days  

Science Conference Proceedings (OSTI)

Digital radar data and atmospheric sounding information were analyzed with the intention of beginning a search for atmospheric parameters which are easily attainable, are independent of whether or not clouds are seeded, and either individually or ...

Gerard E. Klazura; Robert G. Pritchard

1980-03-01T23:59:59.000Z

200

Comparison of Lake-Effect Snow Precipitation Rates Determined from Radar and Aircraft Measurements  

Science Conference Proceedings (OSTI)

Snow-particle size-mass relations derived from radar reflectivity and particle-size spectra obtained from Particle Measuring Systems (PMS) probes in nonconvective clouds predict greater masses for large particles than are indicated by most direct ...

R. R. Braham Jr.; D. A. R. Kristovich; M. J. Dungey

1992-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Early Radar Echoes from Ultragiant Aerosol in a Cumulus Congestus: Modeling and Observations  

Science Conference Proceedings (OSTI)

The growth of ultragiant aerosol (UGA) in a Lagrangian framework within a simulated three-dimensional cloud is analyzed and compared with radar and aircraft observations of a cumulus congestus collected during the Small Cumulus Microphysics Study ...

Sonia G. Lasher-Trapp; Charles A. Knight; Jerry M. Straka

2001-12-01T23:59:59.000Z

202

Passive Millimeter-Wave Spectrometer for Remote Chemical Detection  

NLE Websites -- All DOE Office Websites (Extended Search)

Passive Millimeter-Wave Spectrometer for Remote Chemical Detection Multimedia Nuclear Systems Analysis Engineering Analysis Nonproliferation and National Security Detection &...

203

Measuring Crystal Size in Cirrus Using 35- and 94-GHz Radars  

Science Conference Proceedings (OSTI)

Results are presented from a case study in which coincident 35- and 94-GHz radars located at Chilbolton, England, were used to measure crystal size in cirrus clouds. In the presence of larger crystals the 94-GHz radar scatters sufficiently beyond ...

Robin J. Hogan; Anthony J. Illingworth; Henri Sauvageot

2000-01-01T23:59:59.000Z

204

Sea Ice Identification and Derivation of Its Velocity Field by X-Band Doppler Radar  

Science Conference Proceedings (OSTI)

In this study a 3D scanning X-band Doppler radar (XDR) was deployed near the coast of the Sea of Okhotsk, Hokkaido, Japan, in November 2005 to simultaneously observe sea ice and snow clouds. Doppler radars are commonly used to detect wind fields ...

Yasushi Fujiyoshi; Koji Osumi; Masayuki Ohi; Yoshinori Yamada

2013-06-01T23:59:59.000Z

205

Leading and Trailing Anvil Clouds of West African Squall Lines  

Science Conference Proceedings (OSTI)

The anvil clouds of tropical squall-line systems over West Africa have been examined using cloud radar data and divided into those that appear ahead of the leading convective line and those on the trailing side of the system. The leading anvils ...

Jasmine Cetrone; Robert A. Houze Jr.

2011-05-01T23:59:59.000Z

206

ARM - Measurement - Cloud particle size distribution  

NLE Websites -- All DOE Office Websites (Extended Search)

size distribution size distribution ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Cloud particle size distribution The number of cloud particles present in any given volume of air within a specified size range, including liquid and ice. Categories Cloud Properties Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments WSACR : Scanning ARM Cloud Radar, tuned to W-Band (95GHz) Field Campaign Instruments CPI : Cloud Particle Imager CLDAEROSMICRO : Cloud and Aerosol Microphysical Properties

207

mace-98.pdf  

NLE Websites -- All DOE Office Websites (Extended Search)

of Millimeter Wave Cloud Radar Data G. G. Mace Department of Meteorology University of Utah Salt Lake City, Utah E. E. Clothiaux Department of Meteorology The Pennsylvania State...

208

DOE/SC-ARM-10-006.6 ARM Climate Research Facility Monthly Instrument...  

NLE Websites -- All DOE Office Websites (Extended Search)

Refurbish Millimeter Wave Cloud Radar Antennas, was begun in 2007, and over a 3-year period, the MMCR antennas will be refurbished and characterized on an antenna range....

209

ARM - Publications: Science Team Meeting Documents  

NLE Websites -- All DOE Office Websites (Extended Search)

Radiometer Measurements and Retrievals Using Time Series Analyses* Effect of Stratus on Solar Radiation: A Study using Millimeter Wave Cloud Radar and Microwave Radiometer Data...

210

Frontiers in Global Change Seminar Series presents ?  

NLE Websites -- All DOE Office Websites (Extended Search)

classification technique that combines European Centre for Medium-range Weather Forecast analysis data and vertically pointing millimeter wavelength cloud radar observations...

211

liljegren(2)-99.PDF  

NLE Websites -- All DOE Office Websites (Extended Search)

and Millimeter Cloud Radar to Improve Integrated Liquid Water Retrievals J. C. Liljegren Ames Laboratory Ames, Iowa Introduction The present statistical retrieval, with which the...

212

Evaluation of Cloud Type Occurrences and Radiative Forcings Simulated by a Cloud Resolving Model Using Observations from Sa...  

NLE Websites -- All DOE Office Websites (Extended Search)

Cloud Type Occurrences Cloud Type Occurrences and Radiative Forcings Simulated by a Cloud Resolving Model Using Observations from Satellite and Cloud Radar Y. Luo and S. K. Krueger University of Utah Salt Lake City, Utah Introduction Because of both the various effects clouds exert on the earth-atmospheric system and the cloud feedback, correct representations of clouds in numerical models are critical for accurate climate modeling and weather forecast. Unfortunately, determination of clouds and their radiative feedback processes is still the weakest component of current general circulation models (e.g., Senior and Mitchell 1993, Cess et al. 1996). Using radiative fluxes at the top of atmosphere (TOA) available from satellite observations made by the Earth Radiation Budget Experiment (ERBE; Barkstrom 1984), one could assess cloud radiative effects

213

TOWARDS A CHARACTERIZATION OF ARCTIC MIXED-PHASE CLOUDS CIRES/NOAA/ETL  

E-Print Network (OSTI)

, radar-based retrieval methods. On average, mixed-phase cloud ice particle mean diameters increase fromTOWARDS A CHARACTERIZATION OF ARCTIC MIXED-PHASE CLOUDS Shupe, M. CIRES/NOAA/ETL Kollias, P Laboratory P.O. Box, Upton, NY www.bnl.gov ABSTRACT Mixed-phase clouds play a unique role in the Arctic

214

Stratocumulus Clouds  

Science Conference Proceedings (OSTI)

This paper reviews the current knowledge of the climatological, structural, and organizational aspects of stratocumulus clouds and the physical processes controlling them. More of Earth’s surface is covered by stratocumulus clouds than by any ...

Robert Wood

2012-08-01T23:59:59.000Z

215

Millimeter wave sensor for monitoring effluents  

DOE Patents (OSTI)

A millimeter-wave sensor for detecting and measuring effluents from processing plants either remotely or on-site includes a high frequency signal source for transmitting frequency-modulated continuous waves in the millimeter or submillimeter range with a wide sweep capability and a computer-controlled detector for detecting a plurality of species of effluents on a real time basis. A high resolution spectrum of an effluent, or effluents, is generated by a deconvolution of the measured spectra resulting in a narrowing of the line widths by 2 or 3 orders of magnitude as compared with the pressure broadened spectra detected at atmospheric pressure for improved spectral specificity and measurement sensitivity. The sensor is particularly adapted for remote monitoring such as where access is limited or sensor cost restricts multiple sensors as well as for large area monitoring under nearly all weather conditions.

Gopalsami, Nachappa (Naperville, IL); Bakhtiari, Sasan (Bolingbrook, IL); Raptis, Apostolos C. (Downers Grove, IL); Dieckman, Stephen L. (Downers Grove, IL)

1995-01-01T23:59:59.000Z

216

ARM - Instrument - mmcr  

NLE Websites -- All DOE Office Websites (Extended Search)

govInstrumentsmmcr govInstrumentsmmcr Documentation MMCR : Handbook MMCR : Instrument Mentor Monthly Summary (IMMS) reports MMCR : Data Quality Assessment (DQA) reports ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Instrument : Millimeter Wavelength Cloud Radar (MMCR) Instrument Categories Cloud Properties Picture of the Millimeter Wave Cloud Radar (MMCR) Picture of the Millimeter Wave Cloud Radar (MMCR) General Overview The MMCR systems probe the extent and composition of clouds at millimeter wavelengths. The MMCR is a zenith-pointing radar that operates at a frequency of 35 GHz. The main purpose of this radar is to determine cloud boundaries (e.g., cloud bottoms and tops). This radar will also report radar reflectivity (dBZ) of the atmosphere up to 20 km.

217

Resolving The Moth at Millimeter Wavelengths  

E-Print Network (OSTI)

HD 61005, also known as "The Moth," is one of only a handful of debris disks that exhibit swept-back "wings" thought to be caused by interaction with the ambient interstellar medium (ISM). We present 1.3 mm Submillimeter Array (SMA) observations of the debris disk around HD 61005 at a spatial resolution of 1.9 arcsec that resolve the emission from large grains for the first time. The disk exhibits a double-peaked morphology at millimeter wavelengths, consistent with an optically thin ring viewed close to edge-on. To investigate the disk structure and the properties of the dust grains we simultaneously model the spatially resolved 1.3 mm visibilities and the unresolved spectral energy distribution. The temperatures indicated by the SED are consistent with expected temperatures for grains close to the blowout size located at radii commensurate with the millimeter and scattered light data. We also perform a visibility-domain analysis of the spatial distribution of millimeter-wavelength flux, incorporating constr...

Ricarte, Angelo; Hughes, A Meredith; Duchêne, Gaspard; Williams, Jonathan P; Andrews, Sean M; Wilner, David J

2013-01-01T23:59:59.000Z

218

Radar | Open Energy Information  

Open Energy Info (EERE)

Radar Radar Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Radar Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Remote Sensing Techniques Exploration Sub Group: Active Sensors Parent Exploration Technique: Active Sensors Information Provided by Technique Lithology: Stratigraphic/Structural: Detect fault and ground movement Hydrological: Can give indications about subsurface geothermal fluid flow Thermal: Dictionary.png Radar: Radar is an active-sensor remote sensing tool used to detect small changes in ground movement at geothermal locations. Other definitions:Wikipedia Reegle Introduction RAdio Detection And Ranging (RADAR) is used in a wide variety of applications. In remote sensing applications, the source of the radio waves

219

Observations of Wintertime U.S. West Coast Precipitating Systems with W-Band Satellite Radar and Other Spaceborne Instruments  

Science Conference Proceedings (OSTI)

The potential of CloudSat W-band radar for observing wintertime storms affecting the West Coast of North America is evaluated. Storms having high hydrological impact often result from landfalls of “atmospheric rivers” (“ARs”), which are the narrow ...

Sergey Y. Matrosov

2012-02-01T23:59:59.000Z

220

Nailing Down Ice in a Cloud Model  

NLE Websites -- All DOE Office Websites (Extended Search)

Nailing Down Ice in a Cloud Model Nailing Down Ice in a Cloud Model For original submission and image(s), see ARM Research Highlights http://www.arm.gov/science/highlights/ Research Highlight A research team led by scientists at Pacific Northwest National Laboratory identified specific strengths and weaknesses of four different ice cloud retrieval algorithms. Their comparisons tested the ability of the algorithms to obtain cloud properties from radar and lidar observational measurements. The team noted the sometimes large variances in heating/cooling measurements compared to the observed data. Identifying specific weaknesses will help scientists improve our understanding of cloud properties in the atmosphere, which can be used for climate model development and evaluation. "Measuring the effective size and mass of ice crystals impacts our understanding

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Millimeter-Wave Remote Biometric Identification and Tracking...  

NLE Websites -- All DOE Office Websites (Extended Search)

- Multimedia Bookmark and Share Millimeter-Wave Remote Biometric Identification and Tracking (RBIT) System for Security Applications Argonne National Laboratory and Northwestern...

222

3-D Body Holographic (millimeter wave) Scanner - Available ...  

Using millimeter wave technology, a concealed weapon becomes visible for security screeners who must quickly assess security threats (top); the same ...

223

Passive Millimeter-Wave Spectrometer for Remote Chemical Detection...  

NLE Websites -- All DOE Office Websites (Extended Search)

Media format Windows Media Format - Low Bandwidth Passive Millimeter-Wave Spectrometer for Remote Chemical Detection shown in this movie clip. :: Please wait until video loads...

224

Apparatus for millimeter-wave signal generation  

DOE Patents (OSTI)

An opto-electronic integrated circuit (OEIC) apparatus is disclosed for generating an electrical signal at a frequency .gtoreq.10 GHz. The apparatus, formed on a single substrate, includes a semiconductor ring laser for generating a continuous train of mode-locked lasing pulses and a high-speed photodetector for detecting the train of lasing pulses and generating the electrical signal therefrom. Embodiments of the invention are disclosed with an active waveguide amplifier coupling the semiconductor ring laser and the high-speed photodetector. The invention has applications for use in OEICs and millimeter-wave monolithic integrated circuits (MMICs).

Vawter, G. Allen (Albuquerque, NM); Hietala, Vincent M. (Placitas, NM); Zolper, John C. (Albuquerque, NM); Mar, Alan (Albuquerque, NM); Hohimer, John P. (Albuquerque, NM)

1999-01-01T23:59:59.000Z

225

Cloud Chmabers  

NLE Websites -- All DOE Office Websites (Extended Search)

Video - (Requires Windows Media Player) Build your own cloud chamber - Instructions Project Contact: Tom Jordan Web Maintainer: qnet-webmaster@fnal.gov Last Update: May 31, 2011...

226

Combined Observational and Model Investigations of the Z–LWC Relationship in Stratocumulus Clouds  

Science Conference Proceedings (OSTI)

In situ measurements indicate the complexity and nonunique character of radar reflectivity–liquid water content (Z–LWC) relationships in stratocumulus and cumulus clouds. Parameters of empirical (statistical) Z–LWC dependences vary within a wide ...

A. Khain; M. Pinsky; L. Magaritz; O. Krasnov; H. W. J. Russchenberg

2008-02-01T23:59:59.000Z

227

Multiwavelength Observations of a Developing Cloud System: The FIRE II 26 November 1991 Case Study  

Science Conference Proceedings (OSTI)

Simultaneous multiwavelength measurements of a developing cloud system were obtained by NOAA Doppler lidar, Doppler radar, Fourier transform infrared interferometer, and microwave and infrared radiometers on 26 November 1991. The evolution of the ...

J. M. Intrieri; W. L. Eberhard; T. Uttal; J. A. Shaw; J. B. Snider; Y. Han; B. W. Orr; S. Y. Matrosov

1995-12-01T23:59:59.000Z

228

Deep Orographic Cloud Structure and Composition Derived from Comprehensive Remote Sensing Measurements  

Science Conference Proceedings (OSTI)

Coordinated polarization lidar, Ku-band radar and dual-channel microwave radiometer observations of a deep orographic cloud system were collected from a mountain-base site in northwestern Colorado as part of the Colorado Orographic Seeding ...

Kenneth Sassen

1984-04-01T23:59:59.000Z

229

Mesoscale Organization and Cloud Microphysics in a Bay of Bengal Depression  

Science Conference Proceedings (OSTI)

Airborne radar and cloud microphysical data were obtained throughout a monsoon depression observed over the Bay of Bengal on 3–8 July 1979 during the Summer Monsoon Experiment of the Global Atmospheric Research Programme. The precipitation in the ...

Robert A. Houze Jr.; Dean D. Churchill

1987-07-01T23:59:59.000Z

230

Relationship between a Weakening Cold Front, Misocyclones, and Cloud Development on 10 June 2002 during IHOP  

Science Conference Proceedings (OSTI)

The finescale structure and evolution of a cold front in the presence of small-scale circulations are examined using overdetermined dual-Doppler syntheses of mobile radar data along with thermodynamic data and cloud imagery collected on 10 June ...

Nettie R. Arnott; Yvette P. Richardson; Joshua M. Wurman; Erik M. Rasmussen

2006-01-01T23:59:59.000Z

231

Melting Layer Cloud Observed during R/V Mirai Cruise MR01-K05  

Science Conference Proceedings (OSTI)

In this study, cloud profiling radar and lidar were used to determine the frequency distribution of the base heights of cloudy layers with little (or no) falling condensate particles. The data were obtained from stationary observations conducted ...

Kazuaki Yasunaga; Kunio Yoneyama; Hisayuki Kubota; Hajime Okamoto; Atsushi Shimizu; Hiroshi Kumagai; Masaki Katsumata; Nobuo Sugimoto; Ichiro Matsui

2006-11-01T23:59:59.000Z

232

Ground-Based Radar  

NLE Websites -- All DOE Office Websites (Extended Search)

Measurement Measurement (ARM) Program A Laboratory for the Study of Clouds and Atmospheric Radiation The Atmospheric Radiation Measurement (ARM) Program A Laboratory for the Study of Clouds and Atmospheric Radiation Tom Ackerman Chief Scientist Tom Ackerman Chief Scientist ARM ARM Atmospheric Radiation Measurement Atmospheric Radiation Measurement Why Study Clouds and Radiation? Why Study Clouds and Radiation? * Clouds control the radiation balance of the planet - top of atmosphere (TOA) and surface - Solar reflectivity at TOA and surface transmission - Infrared loss at TOA and surface heating * Cloud feedback processes (how cloud properties change in response to changes in climate forcing) are the most important and least understood component of climate change simulations * Clouds control the radiation balance of the

233

Cellular clouds  

Science Conference Proceedings (OSTI)

This paper progresses an analysis of what it means to be a cellular network operator and what form the ownership and control of future cellular networks may take. Alternative modes of ownership may allow for the creation of more flexible cellular networking ... Keywords: Cellular Cloud, Cellular network, Cloud Computing, Cognitive radio, DSA, LTE, MVNO, Services, Utility Cellular Network

Tim Forde; Linda Doyle

2013-03-01T23:59:59.000Z

234

Compressive Passive Millimeter-Wave Imager (Flash format)  

NLE Websites -- All DOE Office Websites (Extended Search)

Compressive Passive Millimeter-Wave Imager > (Flash) Compressive Passive Millimeter-Wave Imager > (Flash) Multimedia Nuclear Systems Analysis Engineering Analysis Nonproliferation and National Security Detection & Diagnostic Systems Compressive Passive Millimeter-Wave Imager VIDEO TRANSCRIPT Remote Vital Sign Monitoring System Preventing the Worst (by CNN) Engineering Development & Applications Argonne's Nuclear Science & Technology Legacy Other Multimedia Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Detection & Diagnostic Systems - Multimedia Bookmark and Share Compressive Passive Millimeter-Wave Imager Argonne National Laboratory Read full story Argonne has developed a passive compressive sensing system that uses millimeter waves (MMWs) to rapidly image targets with high resolution and

235

Surface based remote sensing of aerosol-cloud interactions  

NLE Websites -- All DOE Office Websites (Extended Search)

Surface based remote sensing of aerosol-cloud interactions Surface based remote sensing of aerosol-cloud interactions Feingold, Graham NOAA/Environmental Technology Laboratory Frisch, Shelby NOAA/Environmental Technology Laboratory Min, Qilong State University of New York at Albany Category: Cloud Properties We will present an analysis of the effect of aerosol on clouds at the Southern Great Plains ARM site. New methods for retrieving cloud droplet effective radius with radar (MMCR), multifilter rotating shadowband radiometer (MFRSR), and microwave radiometer (MWR) will be discussed. Relationships based on adiabatic clouds will be used to constrain retrievals. We will investigate the use of a range of proxies for cloud condensation nuclei, ranging from surface measurements of light scattering and accumulation mode number concentration, to lidar-measured extinction or

236

Very Early Formation of Big, Liquid Drops Revealed by ZDR in Continental Cumulus  

Science Conference Proceedings (OSTI)

Examination of the early radar echo histories of several vigorous, cumulus clouds in northeast Colorado and northwest Kansas, with sensitive, dual-polarization radar, reveals the formation of millimeter-sized water drops at about the same time ...

Charles A. Knight

2006-07-01T23:59:59.000Z

237

ARM - PI Product - Cloud Properties and Radiative Heating Rates for TWP  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsCloud Properties and Radiative Heating Rates for ProductsCloud Properties and Radiative Heating Rates for TWP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send PI Product : Cloud Properties and Radiative Heating Rates for TWP 2002.01.01 - 2012.02.08 Site(s) TWP General Description A cloud properties and radiative heating rates dataset is presented where cloud properties retrieved using lidar and radar observations are input into a radiative transfer model to compute radiative fluxes and heating rates at three ARM sites located in the Tropical Western Pacific (TWP) region. The cloud properties retrieval is a conditional retrieval that applies various retrieval techniques depending on the available data, that is if lidar, radar or both instruments detect cloud. This Combined Remote

238

Synthetic Aperture Radar Interferometry  

E-Print Network (OSTI)

Synthetic aperture radar interferometry is an imaging technique for measuring the topography of a surface, its changes over time, and other changes in the detailed characteristics of the surface. By exploiting the phase of the coherent radar signal, interferometry has transformed radar remote sensing from a largely interpretive science to a quantitative tool, with applications in cartography, geodesy, land cover characterization, and natural hazards. This paper reviews the techniques of interferometry, systems and limitations, and applications in a rapidly growing area of science and engineering.

Paul A. Rosen; Scott Hensley; Ian R. Joughin; Fuk K. Li; Søren N. Madsen; Senior Member; Ernesto Rodríguez; Richard M. Goldstein

2000-01-01T23:59:59.000Z

239

Synthetic Aperture Radar -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Information Contacts Synthetic Aperture Radar Sandia synthetic aperture radar image of Washington, DC Sandia synthetic aperture radar image of Washington, DC Sandia synthetic...

240

Evaluation of Cloud-Resolving Model Intercomparison Simulations Using TWP-ICE Observations: Precipitation and Cloud Structure  

SciTech Connect

The Tropical Warm Pool – International Cloud Experiment (TWP-ICE) provided high quality model forcing and observational datasets through which detailed model and observational intercomparisons could be performed. In this first of a two part study, precipitation and cloud structures within nine cloud-resolving model simulations are compared with scanning radar reflectivity and satellite infrared brightness temperature observations during an active monsoon period from 19 to 25 January 2006. Most simulations slightly overestimate volumetric convective rainfall. Overestimation of simulated convective area by 50% or more in several simulations is somewhat offset by underestimation of mean convective rain rates. Stratiform volumetric rainfall is underestimated by 13% to 53% despite overestimation of stratiform area by up to 65% because stratiform rain rates in every simulation are much lower than observed. Although simulations match the peaked convective radar reflectivity distribution at low levels, they do not reproduce the peaked distributions observed above the melting level. Simulated radar reflectivity aloft in convective regions is too high in most simulations. In stratiform regions, there is a large spread in model results with none resembling observed distributions. Above the melting level, observed radar reflectivity decreases more gradually with height than simulated radar reflectivity. A few simulations produce unrealistically uniform and cold 10.8-?m infrared brightness temperatures, but several simulations produce distributions close to observed. Assumed ice particle size distributions appear to play a larger role than ice water contents in producing incorrect simulated radar reflectivity distributions aloft despite substantial differences in mean graupel and snow water contents across models.

Varble, Adam; Fridlind, Ann; Zipser, Edward J.; Ackerman, Andrew; Chaboureau, Jean-Pierre; Fan, Jiwen; Hill, Adrian; McFarlane, Sally A.; Pinty, Jean-Pierre; Shipway, Ben

2011-10-04T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Horizontal Convective Rolls in Cold Air over Water: Buoyancy Characteristics of Coherent Plumes Detected by an Airborne Radar  

Science Conference Proceedings (OSTI)

Aircraft and airborne cloud radar data are used to describe the vertical structure of the convective boundary layer (CBL) during cold-air outbreaks over Lake Michigan in January 2004. Two days with mesoscale cloud street structure and a day with ...

Qiong Yang; Bart Geerts

2006-09-01T23:59:59.000Z

242

Downhole pulse radar  

DOE Patents (OSTI)

A borehole logging tool generates a fast rise-time, short duration, high peak-power radar pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. Radar returns from geological discontinuities are sampled for transmission uphole. 7 figs.

Chang, Hsi-Tien

1987-09-28T23:59:59.000Z

243

Downhole pulse radar  

DOE Patents (OSTI)

A borehole logging tool generates a fast rise-time, short duration, high peak-power radar pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. Radar returns from geological discontinuities are sampled for transmission uphole.

Chang, Hsi-Tien (Albuquerque, NM)

1989-01-01T23:59:59.000Z

244

Final Technical Report on Scaling Models of the Internal Variability of Clouds DoE Grant No. DE-FG02-04ER63773  

SciTech Connect

The purpose of this proposal is to gain a better understanding of the space-time correlations of atmospheric fluctuations in clouds through application of methods from statistical physics to high resolution, continuous data sets of cloud observations available at the Department of Energy Atmospheric Radiation Measurement Program archive. In this report we present the accomplishments achieved during the four year period. Starting with the most recent one, we report on two break-throughs in our research that make the fourth year of the project exceptionally successful and markedly outperforming the objectives. The first break-through is on characterization of the structure of cirrus radiative properties at large, intermediate and small, generating cells scales by applying the Fokker-Planck equation method and other methods to ARM millimeter wavelength radar observations collected at the Southern Great Plains site. The second break-through is that we show that different characterizations of the cirrus radiative properties are obtained for different synoptic scale environments. We outline a stochastic approach to investigate the internal structure of radiative properties of cirrus clouds based on empirical modeling and draw conclusions about cirrus dynamical properties in the context of the synoptic environment. Results on the structure of cirrus dynamical properties are consistent with the structure of cirrus based on aircraft in situ measurements, with results from ground-based Raman lidar, and with results from model studies. These achievements would not have been possible without the accomplishments from the previous years on a number of problems that involve application of methods of analysis such as the Fokker-Planck equation approach, Tsallis nonextensive statistical mechanics, detrended fluctuation analysis, and others. These include stochastic analysis of neutrally stratified cirrus layers, internal variability and turbulence in cirrus, dynamical model and nonextensive statistical mechanics of liquid water path fluctuations, etc.

Ivanova, Kristinka

2008-04-24T23:59:59.000Z

245

ARM - Publications: Science Team Meeting Documents  

NLE Websites -- All DOE Office Websites (Extended Search)

Cloud Height Statistics Derived from ARM Millimeter Cloud Radar Cloud Height Statistics Derived from ARM Millimeter Cloud Radar Kato, S. (a), Clothiaux, E.E. (b), and Xu, K.-M. (c), Hampton University (a), Pennsylvania State University (b), NASA Langley Research Center(c) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting The probability of occurrence of the cloud top height for a given altitude and relation to the geometrical cloud thickness are derived from radar reflectivity factor taken by a millimeter cloud radar operated at ARM Oklahoma site. Statistics derived using July 1997 data show that the cloud top is likely to occur at 12 km and clouds extend to the lower troposphere. Statistics derived using January 1998 data show that single layer boundary layer clouds are dominant. There is another cloud top peak, although less

246

Dynamical-Microphysical Evolution of a Convective Storm in a Weakly-Sheared Environment. Part II: Airflow and Precipitation Trajectories from Doppler Radar Observations  

Science Conference Proceedings (OSTI)

Measurements from three Doppler radars of air motion and observations of the environment and storm reflectivity structure, supplemented by aircraft measurements of precipitation and cloud particles, are used to establish the dynamical framework ...

L. Jay Miller; James E. Dye; Brooks E. Martner

1983-09-01T23:59:59.000Z

247

Geologic interpretation of space shuttle radar images of Indonesia  

SciTech Connect

The National Aeronautics and Space Administration (NASA) space shuttle mission in November 1981 acquired images of parts of the earth with a synthetic aperture radar system at a wavelength of 23.5 cm (9.3 in.) and spatial resolution of 38 m (125 ft). This report describes the geologic interpretation of 1:250,000-scale images of Irian Jaya and eastern Kalimantan, Indonesia, where the all-weather capability of radar penetrates the persistent cloud cover. The inclined look direction of radar enhances subtle topographic features that may be the expression of geologic structures. On the Indonesian images, the following terrain categories are recognizable for geologic mapping: carbonate, clastic, volcanic, alluvial and coastal, melange, and metamorphic, as well as undifferentiated bedrock. Regional and local geologic structures are well expressed on the images.

Sabing, F.F.

1983-11-01T23:59:59.000Z

248

Physical Response of Convective Clouds over the Sierra Nevada to Seeding with Dry Ice  

Science Conference Proceedings (OSTI)

The effect of seeding convective clouds with dry ice was studied using simultaneous aircraft and radar observations. Clouds that were initially ice-free with supercooled liquid water contents of 0.5 g m?3 when the tops reached the ?10°C level had ...

Arlen W. Huggins; Alfred R. Rodi

1985-10-01T23:59:59.000Z

249

The Shape of Large Tropospheric Clouds, or “Very Like a Whale”  

Science Conference Proceedings (OSTI)

Lovejoy (1982) analyzed radar and satellite images of convective clouds and rainbands extending over an area range from 10 to 106 km2 and found the fractal cloud-perimeter dimension to equal 1.35, indicating the presence of a Richardson, three-...

F. A. Gifford

1989-05-01T23:59:59.000Z

250

Compressive Passive Millimeter-Wave Imager - Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Compressive Passive Millimeter-Wave Imager Compressive Passive Millimeter-Wave Imager Multimedia Nuclear Systems Analysis Engineering Analysis Nonproliferation and National Security Detection & Diagnostic Systems Compressive Passive Millimeter-Wave Imager VIDEO TRANSCRIPT Remote Vital Sign Monitoring System Preventing the Worst (by CNN) Engineering Development & Applications Argonne's Nuclear Science & Technology Legacy Other Multimedia Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Detection & Diagnostic Systems Multimedia Compressive Passive Millimeter-Wave Imager Video | Other sizes/formats available Other available versions of this video: Problems viewing the video in this page? Choose another format/size from the menu below; this video is available in Flash Video Flash, Quicktime video Quicktime or Windows Media video Windows Media format

251

Mode conversation losses in overmolded millimeter wave transmission lines  

E-Print Network (OSTI)

Millimeter wave transmission lines are integral components for many important applications like nuclear fusion and NMR spectroscopy. In low loss corrugated transmission lines propagating the HE,1 mode with a high waveguide ...

Tax, David S. (David Samuel)

2008-01-01T23:59:59.000Z

252

1  

NLE Websites -- All DOE Office Websites (Extended Search)

Tenth ARM Science Team Meeting Proceedings, San Antonio, Texas, March 13-17, 2000 1 Ice Cloud Extinction Retrieval Using Ground-Based and Airborne Millimeter-Wave Cloud Radar...

253

Radar remote sensing of the lower atmosphere  

E-Print Network (OSTI)

on the observed radar clutter power. Marine ducts and theiron observed radar clutter power. Marine ducts and their

Karimian, Ali

2012-01-01T23:59:59.000Z

254

Cloud computing beyond objects: seeding the cloud  

Science Conference Proceedings (OSTI)

Cloud computing is an emerging computing milieu which dynamically enables scalable and virtually unlimited resources. This panel will discuss emerging tools, skills and technologies that will ""seed the cloud"" - enabling improved interoperability, security, ... Keywords: cloud computing, skills, technologies, tools

Steven Fraser; Robert Biddle; Scott Jordan; Kate Keahey; Bob Marcus; E. Michael Maximilien; Dave Thomas

2009-10-01T23:59:59.000Z

255

A Physically Based Radar Simulator  

Science Conference Proceedings (OSTI)

There is a growing use of multiparameter radars for observation of the atmosphere and, in particular, for remote sensing of rain. Radar systems have the undeniable advantage of being able to monitor very large areas with a single installation in ...

Carlo Capsoni; Michele D’Amico

1998-04-01T23:59:59.000Z

256

Accounting for Unresolved Spatial Variability in Large Scale Models: Development and Evaluation of a Statistical Cloud Parameterization with Prognostic Higher Order Moments  

SciTech Connect

This project focused on the variability of clouds that is present across a wide range of scales ranging from the synoptic to the millimeter. In particular, there is substantial variability in cloud properties at scales smaller than the grid spacing of models used to make climate projections (GCMs) and weather forecasts. These models represent clouds and other small-scale processes with parameterizations that describe how those processes respond to and feed back on the largescale state of the atmosphere.

Robert Pincus

2011-05-17T23:59:59.000Z

257

Relationship between Ice Water Path and Downward Longwave Radiation for Clouds Optically Thin in the Infrared: Observations and Model Calculations  

Science Conference Proceedings (OSTI)

A vertically pointing 3.2-cm radar is used to observe altostratus and cirrus clouds as they pass overhead. Radar reflectivities are used in combination with an empirical Zi-IWC (ice water content) relationship developed by Sassen (1987) to ...

Taneil Uttal; Sergey Y. Matrosov; Jack B. Snider; Robert A. Kropfli

1994-03-01T23:59:59.000Z

258

Definition: Radar | Open Energy Information  

Open Energy Info (EERE)

Radar Radar Jump to: navigation, search Dictionary.png Radar Radar is an active-sensor remote sensing tool used to detect small changes in ground movement at geothermal locations. View on Wikipedia Wikipedia Definition Radar is an object detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path. The object returns a tiny part of the wave's energy to a dish or antenna which is usually located at the same site as the transmitter. Radar was secretly developed by several nations before and

259

ARM - Facility News Article  

NLE Websites -- All DOE Office Websites (Extended Search)

Battle With Bugs Nearly Over Thanks to New Radar Battle With Bugs Nearly Over Thanks to New Radar Bookmark and Share The new W-band ARM cloud radar, or WACR, provides improved sensitivity for detecting tiny objects in the atmosphere to an altitude of 5 km. The instrument's antenna is located adjacent to the millimeter wave cloud radar (MMCR) antenna on top of the MMCR shelter; the rest of the unit is located inside (inset). The new W-band ARM cloud radar, or WACR, provides improved sensitivity for detecting tiny objects in the atmosphere to an altitude of 5 km. The instrument's antenna is located adjacent to the millimeter wave cloud radar (MMCR) antenna on top of the MMCR shelter; the rest of the unit is located inside (inset). The main purpose of the millimeter wavelength cloud radar (MMCR) is to

260

A Comparison of Radar Reflectivity Estimates of Rainfall from Collocated Radars  

Science Conference Proceedings (OSTI)

Radar reflectivity–based rainfall estimates from collocated radars are examined. The usual large storm-to-storm variations in radar bias and high correlation between radar estimates and rain gauge observations are found. For three storms in ...

Edward A. Brandes; J. Vivekanandan; James W. Wilson

1999-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Radar Rainshower Growth Histories and Variations with Wind Speed, Echo Motion, Location and Merger Status  

Science Conference Proceedings (OSTI)

Data from rainshowers observed by the WSR-57 radar at the NOAA National Hurricane Center in Miami were tape-recorded during three recent summers as part of the Florida Area Cumulus Experiment (FACE). Past studies of convective clouds in the 13 × ...

Victor Wiggert; Gloria J. Lockett; Stellan S. Ostlund

1981-07-01T23:59:59.000Z

262

Cloud Computing Operations Research  

Science Conference Proceedings (OSTI)

This paper argues that the cloud computing industry faces many decision problems where operations research OR could add tremendous value. To this end, we provide an OR perspective on cloud computing in three ways. First, we compare the cloud computing ... Keywords: cloud IT, cloud computing, green IT, operations research, supply chain

Ilyas Iyoob, Emrah Zarifoglu, A. B. Dieker

2013-06-01T23:59:59.000Z

263

ARM - Facility News Article  

NLE Websites -- All DOE Office Websites (Extended Search)

Radar Focus Group Zeroes in on Data Quality Radar Focus Group Zeroes in on Data Quality Bookmark and Share On the roof of the radar instrument shelter at the ARM Southern Great Plains site, antennas for the W-band ARM Cloud Radar (rectangular white box) and millimeter wavelength cloud radar (conical cylinder) send data to their respective computer systems inside the shelter. On the roof of the radar instrument shelter at the ARM Southern Great Plains site, antennas for the W-band ARM Cloud Radar (rectangular white box) and millimeter wavelength cloud radar (conical cylinder) send data to their respective computer systems inside the shelter. In 2007, ARM established a Radar Focus Group to address strategic needs related to the use of radars as a key component of the ARM instrument suite. Based on needs identified by this group, a smaller team of science,

264

Cloud Condensation Nuclei  

Science Conference Proceedings (OSTI)

The state of knowledge of the particles upon which liquid droplets condense to form atmospheric water clouds is presented. The realization of cloud condensation nuclei (CCN) as a distinct aerosol subset originated with the cloud microphysical ...

James G. Hudson

1993-04-01T23:59:59.000Z

265

Forecasting of Supercooled Clouds  

Science Conference Proceedings (OSTI)

Using parameterizations of cloud microphysics, a technique to forecast supercooled cloud events is suggested. This technique can be coupled on the mesoscale with a prognostic equation for cloud water to improve aircraft icing forecasts. The ...

André Tremblay; Anna Glazer; Wanda Szyrmer; George Isaac; Isztar Zawadzki

1995-07-01T23:59:59.000Z

266

Comparing Occurrences and Vertical Structures of Hydrometeors between Eastern China and the Indian Monsoon Region Using CloudSat/CALIPSO Data  

Science Conference Proceedings (OSTI)

Seasonal variations in the occurrence frequency, vertical location, and radar reflectivity factor (dBZ) of hydrometeors covering eastern China and the Indian monsoon region are described using two CloudSat standard products [Geometrical Profiling ...

Yali Luo; Renhe Zhang; Hui Wang

2009-02-01T23:59:59.000Z

267

Organization and Structure of Clouds and Precipitation on the Mid-Atlantic Coast of the United States. Part II: The Mesoscale and Microscale Structures of Some Frontal Rainbands  

Science Conference Proceedings (OSTI)

The mesoscale and microscale structures of the clouds and precipitation associated with a frontal system on the mid-Atlantic Coast of the United States are investigated using radar reflectivity and Doppler velocity data, surface mesonet, ...

Joseph M. Sienkiewicz; John D. Locatelli; Peter V. Hobbs; Bart Geerts

1989-05-01T23:59:59.000Z

268

The Mesoscale and Microscale Structure and Organization of Clouds and Precipitation in Midlatitude Cyclones. VI: Wavelike Rainbands Associated With a Cold-Frontal Zone  

Science Conference Proceedings (OSTI)

The cloud and precipitation structure and the airflow associated with wavelike rainbands in a cold-frontal zone have been investigated with Doppler radar, instrumented aircraft, rawinsondes and a network of ground stations. The rainbands were ...

Peng-Yun Wang; David B. Parsons; Peter V. Hobbs

1983-03-01T23:59:59.000Z

269

Stratocumulus Cloud Field Reflected Fluxes: The Effect of Cloud Shape  

Science Conference Proceedings (OSTI)

Reflected fluxes are calculated for stratocumulus cloud fields as a function of sky cover, cloud aspect ratio, and cloud shape. Cloud liquid water volume is held invariant as cloud shape is varied so that the results can be utilized more ...

R. M. Welch; B. A. Wielicki

1984-11-01T23:59:59.000Z

270

The Operational Weather Radar Network in Europe  

Science Conference Proceedings (OSTI)

The operational weather radar network in Europe covers more than 30 countries and contains more than 200 weather radars. The radar network is heterogeneous in hardware, signal processing, transmit/receive frequency, and scanning strategy, thus making it ...

Asko Huuskonen; Elena Saltikoff; Iwan Holleman

271

Tornado Damage Estimation Using Polarimetric Radar  

Science Conference Proceedings (OSTI)

This study investigates the use of tornadic debris signature (TDS) parameters to estimate tornado damage severity using Norman, Oklahoma (KOUN), polarimetric radar data (polarimetric version of the Weather Surveillance Radar-1988 Doppler radar). ...

David J. Bodine; Matthew R. Kumjian; Robert D. Palmer; Pamela L. Heinselman; Alexander V. Ryzhkov

2013-02-01T23:59:59.000Z

272

Wireless electrical power to sub-millimeter robots  

Science Conference Proceedings (OSTI)

A sub-millimeter scale coil is investigated as an alternative means to power electronics for small-scale robots. The AC voltage is induced by time-varying magnetic field. FEM analysis of employing magnetic field concentrators to increase the field density ... Keywords: microfabrication, microrobotic manipulation, power generation

Robert A. Nawrocki; Dominic R. Frutiger; Richard M. Voyles; Bradley J. Nelson

2012-10-01T23:59:59.000Z

273

Rain Attenuation Prediction Model for Lagos at Millimeter Wave Bands  

Science Conference Proceedings (OSTI)

“Rain Attenuation Prediction Model for Lagos at Millimeter Wave bands” is the subject of this work. Lagos (geog. Lat. 6.350N and Long. 3.20E), is a coastal station in the rain forest area in the South-Western Nigeria with an altitude of 380 ...

Abayomi Isiaka Yussuff; Nor Hisham Haji Khamis

274

Evaluation of tropical cloud and precipitation statistics of CAM3 using CloudSat and CALIPSO data  

SciTech Connect

The combined CloudSat and CALIPSO satellite observations provide the first simultaneous measurements of cloud and precipitation vertical structure, and are used to examine the representation of tropical clouds and precipitation in the Community Atmosphere Model Version 3 (CAM3). A simulator package utilizing a model-to-satellite approach facilitates comparison of model simulations to observations, and a revised clustering method is used to sort the subgrid-scale patterns of clouds and precipitation into principal cloud regimes. Results from weather forecasts performed with CAM3 suggest that the model underestimates the horizontal extent of low and mid-level clouds in subsidence regions, but overestimates that of high clouds in ascending regions. CAM3 strongly overestimates the frequency of occurrence of the deep convection with heavy precipitation regime, but underestimates the horizontal extent of clouds and precipitation at low and middle levels when this regime occurs. This suggests that the model overestimates convective precipitation and underestimates stratiform precipitation consistent with a previous study that used only precipitation observations. Tropical cloud regimes are also evaluated in a different version of the model, CAM3.5, which uses a highly entraining plume in the parameterization of deep convection. While the frequency of occurrence of the deep convection with heavy precipitation regime from CAM3.5 forecasts decreases, the incidence of the low clouds with precipitation and congestus regimes increases. As a result, the parameterization change does not reduce the frequency of precipitating convection that is far too high relative to observations. For both versions of CAM, clouds and precipitation are overly reflective at the frequency of the CloudSat radar and thin clouds that could be detected by the lidar only are underestimated.

Zhang, Y; Klein, S; Boyle, J; Mace, G G

2008-11-20T23:59:59.000Z

275

ARM - Measurement - Cloud phase  

NLE Websites -- All DOE Office Websites (Extended Search)

property that captures the state o f the hydrometeors within a cloud (liquid, ice, or mixed-phase). This is distinct from cloud type that involves property descriptors...

276

Glossary Term - Cloud Chamber  

NLE Websites -- All DOE Office Websites (Extended Search)

Ceres Previous Term (Ceres) Glossary Main Index Next Term (Composition of the Earth's Atmosphere) Composition of the
Earth's Atmosphere Cloud Chamber A cloud chamber showing the...

277

How Radar Works | Open Energy Information  

Open Energy Info (EERE)

2013 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for How Radar Works Citation Institute For Geophysics. How Radar Works...

278

Evaluation of Cloud-Resolving Model Intercomparison Simulations Using TWP-ICE Observations: Precipitation and Cloud Structure  

SciTech Connect

The Tropical Warm Pool - International Cloud Experiment (TWP-ICE) provided high quality model forcing and observational datasets through which detailed model and observational intercomparisons could be performed. In this first of a two part study, precipitation and cloud structures within nine cloud-resolving model simulations are compared with scanning radar reflectivity and satellite infrared brightness temperature observations during an active monsoon period from 19 to 25 January 2006. Most simulations slightly overestimate volumetric convective rainfall. Overestimation of simulated convective area by 50% or more in several simulations is somewhat offset by underestimation of mean convective rain rates. Stratiform volumetric rainfall is underestimated by 13% to 53% despite overestimation of stratiform area by up to 65% because stratiform rain rates in every simulation are much lower than observed. Although simulations match the peaked convective radar reflectivity distribution at low levels, they do not reproduce the peaked distributions observed above the melting level. Simulated radar reflectivity aloft in convective regions is too high in most simulations. 29 In stratiform regions, there is a large spread in model results with none resembling 30 observed distributions. Above the melting level, observed radar reflectivity decreases 31 more gradually with height than simulated radar reflectivity. A few simulations produce 32 unrealistically uniform and cold 10.8-?m infrared brightness temperatures, but several 33 simulations produce distributions close to observed. Assumed ice particle size 34 distributions appear to play a larger role than ice water contents in producing incorrect 35 simulated radar reflectivity distributions aloft despite substantial differences in mean 36 graupel and snow water contents across models. 37

Varble, Adam C.; Fridlind, Ann; Zipser, Ed; Ackerman, Andrew; Chaboureau, Jean-Pierre; Fan, Jiwen; Hill, Adrian; McFarlane, Sally A.; Pinty, Jean-Pierre; Shipway, Ben

2011-06-24T23:59:59.000Z

279

ARM - PI Product - Cloud-Scale Vertical Velocity and Turbulent Dissipation  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsCloud-Scale Vertical Velocity and Turbulent ProductsCloud-Scale Vertical Velocity and Turbulent Dissipation Rate Retrievals Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send PI Product : Cloud-Scale Vertical Velocity and Turbulent Dissipation Rate Retrievals Site(s) NSA General Description Time-height fields of retrieved in-cloud vertical wind velocity and turbulent dissipation rate, both retrieved primarily from vertically-pointing, Ka-band cloud radar measurements. Files are available for manually-selected, stratiform, mixed-phase cloud cases observed at the North Slope of Alaska (NSA) site during periods covering the Mixed-Phase Arctic Cloud Experiment (MPACE, late September through early November 2004) and the Indirect and Semi-Direct Aerosol Campaign (ISDAC, April-early May

280

Stratus Cloud Structure from MM-Radar Transects and Satellite...  

NLE Websites -- All DOE Office Websites (Extended Search)

and Artifact Detection with Semi-Discrete Wavelet Analyses A. B. Davis Space and Remote Sensing Sciences Group Los Alamos National Laboratory Los Alamos, New Mexico N. P....

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

A comparison of cloud microphysical quantities with forecasts from cloud prediction models  

SciTech Connect

Numerical weather prediction models (ECMWF, NCEP) are evaluated using ARM observational data collected at the Southern Great Plains (SGP) site. Cloud forecasts generated by the models are compared with cloud microphysical quantities, retrieved using a variety of parameterizations. Information gained from this comparison will be utilized during the FASTER project, as models are evaluated for their ability to reproduce fast physical processes detected in the observations. Here the model performance is quantified against the observations through a statistical analysis. Observations from remote sensing instruments (radar, lidar, radiometer and radiosonde) are used to derive the cloud microphysical quantities: ice water content, liquid water content, ice effective radius and liquid effective radius. Unfortunately, discrepancies in the derived quantities arise when different retrieval schemes are applied to the observations. The uncertainty inherent in retrieving the microphysical quantities using various retrievals is estimated from the range of output microphysical values. ARM microphysical retrieval schemes (Microbase, Mace) are examined along with the CloudNet retrieval processing of data from the ARM sites for this purpose. Through the interfacing of CloudNet and “ARM” processing schemes an ARMNET product is produced and employed as accepted observations in the assessment of cloud model predictions.

Dunn, M.; Jensen, M.; Hogan, R.; O’Connor, E.; Huang, D.

2010-03-15T23:59:59.000Z

282

Ultrasonic radar and its applications  

Science Conference Proceedings (OSTI)

A rangefinder is a device that measures distance from the observer to a target, for the purposes of surveying, determining focus in photography, or accurately aiming a weapon. Some devices use active methods to measure (such as sonar, laser, or radar); ... Keywords: PIC, radar, rangefinder, surveying, target, ultrasonic, weapon

Mansoor-Ul-Hassan Siddique

2009-08-01T23:59:59.000Z

283

A Marine Radar Wind Sensor  

Science Conference Proceedings (OSTI)

A new method for retrieving the wind vector from radar-image sequences is presented. This method, called WiRAR, uses a marine X-band radar to analyze the backscatter of the ocean surface in space and time with respect to surface winds. Wind ...

Heiko Dankert; Jochen Horstmann

2007-09-01T23:59:59.000Z

284

ARM - Field Campaign - Cloud LAnd Surface Interaction Campaign (CLASIC)  

NLE Websites -- All DOE Office Websites (Extended Search)

govCampaignsCloud LAnd Surface Interaction Campaign (CLASIC) govCampaignsCloud LAnd Surface Interaction Campaign (CLASIC) Campaign Links CLASIC Website Related Campaigns CLASIC - SAM Support 2007.06.09, DeVore, SGP CLASIC - 9.4 GHz Phase Array Radar 2007.06.08, Kollias, SGP CLASIC - Southern Great Plains Aerosol Evolution Study (SGPAES) 2007.06.08, Collins, SGP CLASIC - Land Surface 2007.06.01, Jackson, SGP CLASIC - Radiosonde Campaign 2007.06.01, Orr, SGP CLASIC - SGP Particle Phase Experiment 2007.06.01, Martin, SGP CLASIC - Land-Cloud Coupled Data Assimilation System 2007.06.01, Jackson, SGP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Cloud LAnd Surface Interaction Campaign (CLASIC) 2007.06.01 - 2007.06.30 Website : http://acrf-campaign.arm.gov/clasic/ Lead Scientist : Mark Miller

285

Cloud and Precipitation Fields Around Darwin in the Transition Season  

NLE Websites -- All DOE Office Websites (Extended Search)

and Precipitation Fields Around Darwin and Precipitation Fields Around Darwin in the Transition Season P. T. May Bureau of Meteorology Research Centre Melbourne, 3001, Victoria, Australia Introduction An interesting, and very relevant question, for the Atmospheric Radiation Measurement (ARM) Program is how cloud characteristics and their seasonal and diurnal variation changes across the tropics. In particular, how does he cloud field around the new SRCS site compare with nearby regions. Thus, the aim of this study is to look at the characteristics of clouds and precipitation in the area around Darwin and to compare the cloud statistics estimated from geostationary meteorological satellite (GMS) satellite data with other nearby regions. Towards this end, GMS satellite imagery and radar data from

286

ARM - Field Campaign - Biogenic Aerosols - Effects on Clouds and Climate:  

NLE Websites -- All DOE Office Websites (Extended Search)

govCampaignsBiogenic Aerosols - Effects on Clouds and Climate: Snowfall govCampaignsBiogenic Aerosols - Effects on Clouds and Climate: Snowfall Experiment Related Campaigns Biogenic Aerosols- Effects on Clouds and Climate 2014.02.01, Petäjä, AMF Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Biogenic Aerosols - Effects on Clouds and Climate: Snowfall Experiment 2014.02.01 - 2014.04.30 Lead Scientist : Dmitri Moisseev Description The snowfall measurement campaign, which will take place during AMF2 deployment in Finland, will focus on understanding snowfall microphysics and characterizing performance of surface based snowfall measurement instruments. This will be achieved by combining triple frequency (X, Ka, W -band) radar observations of vertical structure of the precipitation,

287

Parameterizing Size Distribution in Ice Clouds  

SciTech Connect

PARAMETERIZING SIZE DISTRIBUTIONS IN ICE CLOUDS David L. Mitchell and Daniel H. DeSlover ABSTRACT An outstanding problem that contributes considerable uncertainty to Global Climate Model (GCM) predictions of future climate is the characterization of ice particle sizes in cirrus clouds. Recent parameterizations of ice cloud effective diameter differ by a factor of three, which, for overcast conditions, often translate to changes in outgoing longwave radiation (OLR) of 55 W m-2 or more. Much of this uncertainty in cirrus particle sizes is related to the problem of ice particle shattering during in situ sampling of the ice particle size distribution (PSD). Ice particles often shatter into many smaller ice fragments upon collision with the rim of the probe inlet tube. These small ice artifacts are counted as real ice crystals, resulting in anomalously high concentrations of small ice crystals (D < 100 µm) and underestimates of the mean and effective size of the PSD. Half of the cirrus cloud optical depth calculated from these in situ measurements can be due to this shattering phenomenon. Another challenge is the determination of ice and liquid water amounts in mixed phase clouds. Mixed phase clouds in the Arctic contain mostly liquid water, and the presence of ice is important for determining their lifecycle. Colder high clouds between -20 and -36 oC may also be mixed phase but in this case their condensate is mostly ice with low levels of liquid water. Rather than affecting their lifecycle, the presence of liquid dramatically affects the cloud optical properties, which affects cloud-climate feedback processes in GCMs. This project has made advancements in solving both of these problems. Regarding the first problem, PSD in ice clouds are uncertain due to the inability to reliably measure the concentrations of the smallest crystals (D < 100 µm), known as the “small mode”. Rather than using in situ probe measurements aboard aircraft, we employed a treatment of ice cloud optical properties formulated in terms of PSD parameters in combination with remote measurements of thermal radiances to characterize the small mode. This is possible since the absorption efficiency (Qabs) of small mode crystals is larger at 12 µm wavelength relative to 11 µm wavelength due to the process of wave resonance or photon tunneling more active at 12 µm. This makes the 12/11 µm absorption optical depth ratio (or equivalently the 12/11 µm Qabs ratio) a means for detecting the relative concentration of small ice particles in cirrus. Using this principle, this project tested and developed PSD schemes that can help characterize cirrus clouds at each of the three ARM sites: SGP, NSA and TWP. This was the main effort of this project. These PSD schemes and ice sedimentation velocities predicted from them have been used to test the new cirrus microphysics parameterization in the GCM known as the Community Climate Systems Model (CCSM) as part of an ongoing collaboration with NCAR. Regarding the second problem, we developed and did preliminary testing on a passive thermal method for retrieving the total water path (TWP) of Arctic mixed phase clouds where TWPs are often in the range of 20 to 130 g m-2 (difficult for microwave radiometers to accurately measure). We also developed a new radar method for retrieving the cloud ice water content (IWC), which can be vertically integrated to yield the ice water path (IWP). These techniques were combined to determine the IWP and liquid water path (LWP) in Arctic clouds, and hence the fraction of ice and liquid water. We have tested this approach using a case study from the ARM field campaign called M-PACE (Mixed-Phase Arctic Cloud Experiment). This research led to a new satellite remote sensing method that appears promising for detecting low levels of liquid water in high clouds typically between -20 and -36 oC. We hope to develop this method in future research.

DeSlover, Daniel; Mitchell, David L.

2009-09-25T23:59:59.000Z

288

Posters Cloud Microphysical and Radiative Properties Measured  

NLE Websites -- All DOE Office Websites (Extended Search)

7 7 Posters Cloud Microphysical and Radiative Properties Measured by Combined Lidar, Radar, and Infrared Radiometer W. L. Eberhard and J. M. Intrieri National Oceanic and Atmospheric Administration Environmental Technology Laboratory Boulder, Colorado K. P. Chan and G. Feingold Cooperative Institute for Research in Environmental Sciences Boulder, Colorado also an order of magnitude smaller. These features make simple approximations in scattering calculations adequate for some applications, e.g., Eberhard (1993a). They also provide some unique capabilities, especially the technique described below for measuring drop sizes. One of the four IDP tasks is to characterize cloud signatures obtained by CO 2 lidar. For instance, our earlier work discovered that depolarization from ice particles was almost

289

ARM - Publications: Science Team Meeting Documents: Millimeter-wave (183  

NLE Websites -- All DOE Office Websites (Extended Search)

Millimeter-wave (183 GHz) Radiometer for High Sensitivity Water Vapor Millimeter-wave (183 GHz) Radiometer for High Sensitivity Water Vapor Measurements at the North Slope of Alaska ARM Site Pazmany, Andrew ProSensing Inc. Funded by a Phase II DOE SBIR contract, ProSensing Inc. is developing a turn-key 183 GHz water vapor radiometer for measuring low concentrations of atmospheric water vapor and liquid water at the North Slope of Alaska ARM site during the dry winter months. The first prototype instrument measures brightness temperature at four double sideband channels centered 1, 3, 7 and 14 GHz from the 183.31 GHz water vapor resonance line. The combination of 0.1 K delta T measurement precision and less than 1 K accuracy integrated hot (~350 K) and warm (~300 K) calibration targets, is expected to result an absolute water vapor measurement accuracy of less than 0.1 mm

290

ARM Climate Research Facility Radar Operations Plan  

SciTech Connect

Roles, responsibilities, and processes associated with Atmospheric Radiation Measurement (ARM) Radar Operations.

Voyles, JW

2012-05-18T23:59:59.000Z

291

A Comparison of ARM Cloud Radar Profiles with MMF Simulated Radar...  

NLE Websites -- All DOE Office Websites (Extended Search)

in meteorology (Zivkovic and Louis 1992; Michelangeli et al. 1995). It has been used as a tool in evaluating global climate and weather models (Hewitson and Crane 1994, 1996;...

292

X-band Scanning ARM Precipitation Radar (X-SAPR) Instrument Handbook  

SciTech Connect

The X-band scanning ARM cloud radar (X-SAPR) is a full-hemispherical scanning polarimetric Doppler radar transmitting simultaneously in both H and V polarizations. With a 200 kW magnetron transmitter, this puts 100 kW of transmitted power for each polarization. The receiver for the X-SAPR is a Vaisala Sigmet RVP-900 operating in a coherent-on-receive mode. Three X-SAPRs are deployed around the Southern Great Plains (SGP) Central Facility in a triangular array. A fourth X-SAPR is deployed near Barrow, Alaska on top of the Barrow Arctic Research Center.

Widener, K; Bharadwaj, N

2012-10-29T23:59:59.000Z

293

SGP Cloud and Land Surface Interaction Campaign (CLASIC): Measurement Platforms  

SciTech Connect

The Cloud and Land Surface Interaction Campaign (CLASIC) will be conducted from June 8 to June 30, 2007, at the U.S. Department of Energy’s Atmospheric Radiation Measurement (ARM) Climate Research Facility (ACRF) Southern Great Plains (SGP) site. Data will be collected using eight aircraft equipped with a variety of specialized sensors, four specially instrumented surface sites, and two prototype surface radar systems. The architecture of CLASIC includes a high-altitude surveillance aircraft and enhanced vertical thermodynamic and wind profile measurements that will characterize the synoptic scale structure of the clouds and the land surface within the ACRF SGP site. Mesoscale and microscale structures will be sampled with a variety of aircraft, surface, and radar observations. An overview of the measurement platforms that will be used during the CLASIC are described in this report. The coordination of measurements, especially as it relates to aircraft flight plans, will be discussed in the CLASIC Implementation Plan.

MA Miller; R Avissar; LK Berg; SA Edgerton; ML Fischer; TJ Jackson; B. Kustas; PJ Lamb; G McFarquhar; Q Min; B Schmid; MS Torn; DD Tuner

2007-06-01T23:59:59.000Z

294

Ice Formation in Arctic Mixed-Phase Clouds: Insights from a 3-D Cloud-Resolving Model with Size-Resolved Aerosol and Cloud Microphysics  

SciTech Connect

The single-layer mixed-phase clouds observed during the Atmospheric Radiation Measurement (ARM) program’s Mixed-Phase Arctic Cloud Experiment (MPACE) are simulated with a 3-dimensional cloud-resolving model the System for Atmospheric Modeling (SAM) coupled with an explicit bin microphysics scheme and a radar-lidar simulator. Two possible ice enhancement mechanisms – activation of droplet evaporation residues by condensation-followed-by-freezing and droplet freezing by contact freezing inside-out, are scrutinized by extensive comparisons with aircraft and radar and lidar measurements. The locations of ice initiation associated with each mechanism and the role of ice nuclei (IN) in the evolution of mixed-phase clouds are mainly addressed. Simulations with either mechanism agree well with the in-situ and remote sensing measurements on ice microphysical properties but liquid water content is slightly underpredicted. These two mechanisms give very similar cloud microphysical, macrophysical, dynamical, and radiative properties, although the ice nucleation properties (rate, frequency and location) are completely different. Ice nucleation from activation of evaporation nuclei is most efficient near cloud top areas concentrated on the edges of updrafts, while ice initiation from the drop freezing process has no significant location preference (occurs anywhere that droplet evaporation is significant). Both enhanced nucleation mechanisms contribute dramatically to ice formation with ice particle concentration of 10-15 times higher relative to the simulation without either of them. The contribution of ice nuclei (IN) recycling from ice particle evaporation to IN and ice particle concentration is found to be very significant in this case. Cloud can be very sensitive to IN initially and form a nonquilibrium transition condition, but become much less sensitive as cloud evolves to a steady mixed-phase condition. The parameterization of Meyers et al. [1992] with the observed MPACE IN concentration is able to predict the observed mixed-phase clouds reasonably well. This validation may facilitate the application of this parameterization in the cloud and climate models to simulate Arctic clouds.

Fan, Jiwen; Ovtchinnikov, Mikhail; Comstock, Jennifer M.; McFarlane, Sally A.; Khain, Alexander

2009-02-27T23:59:59.000Z

295

The Atmospheric Imaging Radar: Simultaneous Volumetric Observations Using a Phased Array Weather Radar  

Science Conference Proceedings (OSTI)

Mobile weather radars often utilize rapid-scan strategies when collecting observations of severe weather. Various techniques have been used to improve volume update times, including the use of agile and multibeam radars. Imaging radars, similar in ...

Bradley Isom; Robert Palmer; Redmond Kelley; John Meier; David Bodine; Mark Yeary; Boon-Leng Cheong; Yan Zhang; Tian-You Yu; Michael I. Biggerstaff

2013-04-01T23:59:59.000Z

296

Effects of Radar Beam Shielding on Rainfall Estimation for the Polarimetric C-Band Radar  

Science Conference Proceedings (OSTI)

Radar reflectivity (Zh), differential reflectivity (Zdr), and specific differential phase (Kdp) measured from the operational, polarimetric weather radar located in Trappes, France, were used to examine the effects of radar beam shielding on ...

Katja Friedrich; Urs Germann; Jonathan J. Gourley; Pierre Tabary

2007-11-01T23:59:59.000Z

297

ARM - Facility News Article  

NLE Websites -- All DOE Office Websites (Extended Search)

Upgrade to Millimeter Wave Cloud Radar Increases Volume of Data Collection Upgrade to Millimeter Wave Cloud Radar Increases Volume of Data Collection Bookmark and Share In mid-April, hardware and software upgrades to the millimeter wave cloud radar (MMCR) at the ARM Climate Research Facility's North Slope of Alaska (NSA) were completed. Hardware upgrades included replacing the OS/2 and Solaris computers with two Windows 2000 computers. One of these computers is for the MMCR radar. It now has a new digital signal processing board that allows much more efficient processing of the radar return signals, resulting in higher temporal resolution. The receiver was also upgraded from a 12 bit to 14 bit analog-to-digital converter. Software on the MMCR radar computer was upgraded to run a modified version of Vaisala's LAP-XM software for controlling and acquiring the radar data. The other computer,

298

Fine Structure of Vertical Motion in the Stratiform Precipitation Region Observed by a VHF Doppler Radar Installed in Sumatra, Indonesia  

Science Conference Proceedings (OSTI)

Vertical motion W profiles in the stratiform precipitation region of mesoscale cloud clusters were investigated using wind data observed by VHF Doppler radar installed in western Sumatra Island (0.2°S, 100.32°E). A special mode for W observations ...

Noriyuki Nishi; Masayuki K. Yamamoto; Toyoshi Shimomai; Atsushi Hamada; Shoichiro Fukao

2007-04-01T23:59:59.000Z

299

Polarimetry for Weather Surveillance Radars  

Science Conference Proceedings (OSTI)

This paper is an overview of weather radar polarimetry emphasizing surveillance applications. The following potential benefits to operations are identified: improvement of quantitative precipitation measurements, discrimination of hail from rain ...

Dusan S. Zrnic; Alexander V. Ryzhkov

1999-03-01T23:59:59.000Z

300

Radar Calibration: Some Simple Approaches  

Science Conference Proceedings (OSTI)

The proper calibration of weather radars has been at the heart of the problem of accurate reflectivity measurements for more than five decades. This paper summarizes a number of methods that have been used previously and others that areworthy of ...

David Atlas

2002-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Global Circuit Model with Clouds  

Science Conference Proceedings (OSTI)

Cloud data from the International Satellite Cloud Climatology Project (ISCCP) database have been introduced into the global circuit model developed by Tinsley and Zhou. Using the cloud-top pressure data and cloud type information, the authors ...

Limin Zhou; Brian A. Tinsley

2010-04-01T23:59:59.000Z

302

Cloud Computing Forum & Workshop II  

Science Conference Proceedings (OSTI)

Cloud Computing Forum & Workshop II. Purpose: On May 20, 2010, NIST hosted the first Cloud Computing Forum & Workshop. ...

2013-08-07T23:59:59.000Z

303

ISCCP Cloud Algorithm Intercomparison  

Science Conference Proceedings (OSTI)

The International Satellite Cloud Climatology Project (ISCCP) will provide a uniform global climatology of satellite-measured radiances and derive an experimental climatology of cloud radiative properties from these radiances. A pilot study to ...

W. B. Rossow; F. Mosher; E. Kinsella; A. Arking; M. Desbois; E. Harrison; P. Minnis; E. Ruprecht; G. Seze; C. Simmer; E. Smith

1985-09-01T23:59:59.000Z

304

ARM - Measurement - Cloud type  

NLE Websites -- All DOE Office Websites (Extended Search)

type ARM Data Discovery Browse Data Comments? We would love to hear from you Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Cloud type Cloud type such as...

305

Entrainment in Cumulus Clouds  

Science Conference Proceedings (OSTI)

Entrainment of dry air into cumulus clouds influences the development of the clouds in a major way. The many aspects of the entrainment process are examined in this paper by critically reviewing the literature from the time when investigations ...

Alan M. Blyth

1993-04-01T23:59:59.000Z

306

Automated cloud resource orchestration  

Science Conference Proceedings (OSTI)

Realizing Infrastructure-as-a-Service (IaaS) cloud requires a control platform for orchestrating the provisioning, configuration, management and decommissioning of a distributed set of diverse cloud resources (i.e., compute, storage, network) serving ...

Changbin Liu / Boon Thau Loo

2012-01-01T23:59:59.000Z

307

North Australian Cloud Lines  

Science Conference Proceedings (OSTI)

A satellite classification and climatology of propagating mesoscale cloud fines in northern Australia is presented. These cloud fines range from long, narrow lines of shallow convection to extensive deep convective squall lines with mesoscale ...

W. Drosdowsky; G. J. Holland

1987-11-01T23:59:59.000Z

308

Clouds in Tropical Cyclones  

Science Conference Proceedings (OSTI)

Clouds within the inner regions of tropical cyclones are unlike those anywhere else in the atmosphere. Convective clouds contributing to cyclogenesis have rotational and deep intense updrafts but tend to have relatively weak downdrafts. Within ...

Robert A. Houze Jr.

2010-02-01T23:59:59.000Z

309

Clouds in Tropical Cyclones  

Science Conference Proceedings (OSTI)

Clouds within the inner regions of tropical cyclones are unlike those anywhere else in the atmosphere. Convective clouds contributing to cyclogenesis have rotational and deep intense updrafts but tend to have relatively weak downdrafts. Within the ...

Robert A. Houze Jr.

2010-02-01T23:59:59.000Z

310

ARM - Facility News Article  

NLE Websites -- All DOE Office Websites (Extended Search)

15, 2009 Facility News Internet Upgrade Speeds Data Transfer from Tropics Bookmark and Share View this video to see how the millimeter wave cloud radar works. View this video to...

311

ARM TR-008  

NLE Websites -- All DOE Office Websites (Extended Search)

8 Millimeter Wave Cloud Radar (MMCR) Handbook January 2005 K. B. Widener K. Johnson Work supported by the U.S. Department of Energy, Office of Science, Office of Biological and...

312

X:\\ARM_19~1\\P283-315.WPD  

NLE Websites -- All DOE Office Websites (Extended Search)

Remote Cloud Sensing Intensive Observation Period (RCS-IOP) Millimeter-Wave Radar Calibration and Data Intercomparison S. M. Sekelsky, J. M. Firda, and R. E. McIntosh Microwave...

313

Microwave and millimeter-wave rectifying circuit arrays and ultra-wideband antennas for wireless power transmission and communications  

E-Print Network (OSTI)

In the future, space solar power transmission and wireless power transmission will play an important role in gathering clean and infinite energy from space. The rectenna, i.e., a rectifying circuit combined with an antenna, is one of the most important components in the wireless power transmission system. To obtain high power and high output voltage, the use of a large rectenna array is necessary. Many novel rectennas and rectenna arrays for microwave and millimeter-wave wireless power transmission have been developed. Unlike the traditional rectifying circuit using a single diode, dual diodes are used to double the DC output voltage with the same circuit layout dimensions. The rectenna components are then combined to form rectenna arrays using different interconnections. The rectennas and the arrays are analyzed by using a linear circuit model. Furthermore, to precisely align the mainbeams of the transmitter and the receiver, a retrodirective array is developed to maintain high efficiency. The retrodirective array is able to track the incident wave and resend the signal to where it came from without any prior known information of the source location. The ultra-wideband radio has become one of the most important communication systems because of demand for high data-rate transmission. Hence, ultra-wideband antennas have received much attention in mobile wireless communications. Planar monopole ultra-wideband antennas for UHF, microwave, and millimeter-wave bands are developed, with many advantages such as simple structure, low cost, light weight, and ease of fabrication. Due to the planar structures, the ultra-wideband antennas can be easily integrated with other circuits. On the other hand, with an ultra-wide bandwidth, source power can be transmitted at different frequencies dependent on power availability. Furthermore, the ultra-wideband antenna can potentially handle wireless power transmission and data communications simultaneously. The technologies developed can also be applied to dual-frequency or the multi-frequency antennas. In this dissertation, many new rectenna arrays, retrodirective rectenna arrays, and ultra-wideband antennas are presented for microwave and millimeter-wave applications. The technologies are not only very useful for wireless power transmission and communication systems, but also they could have many applications in future radar, surveillance, and remote sensing systems.

Ren, Yu-Jiun

2007-05-01T23:59:59.000Z

314

1  

NLE Websites -- All DOE Office Websites (Extended Search)

An Approach to Estimate Rainfall Rates Aloft from An Approach to Estimate Rainfall Rates Aloft from Millimeter Wavelength Cloud Radar Measurements S.Y. Matrosov Cooperative Institute for Research in Environmental Sciences University of Colorado and National Oceanic and Atmospheric Administration Boulder, Colorado Introduction Millimeter wavelength cloud radars (MMCRs) have been used for several years by the Atmospheric Radiation Measurement (ARM) Program for remote sensing of clouds. A number of different remote sensing methods that use radar measurements were developed for retrieving cloud microphysical parameters. Though precipitation (including rainfall and snowfall) is also observed by MMCR, very few attempts have been made to quantitatively retrieve rainfall/snowfall parameters. Precipitation is a

315

Cloud Computing at NERSC  

NLE Websites -- All DOE Office Websites (Extended Search)

Cloud Computing Energy Efficient Computing Exascale Computing Performance & Monitoring Tools Petascale Initiative Science Gateway Development Storage and IO Technologies Testbeds...

316

Phenomenological Description of Tropical Clouds Using CloudSat Cloud Classification  

Science Conference Proceedings (OSTI)

Two years of tropical oceanic cloud observations are analyzed using the operational CloudSat cloud classification product and Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) lidar. Relationships are examined between ...

Ali Behrangi; Terry Kubar; Bjorn Lambrigtsen

2012-10-01T23:59:59.000Z

317

Computing and Partitioning Cloud Feedbacks Using Cloud Property Histograms. Part I: Cloud Radiative Kernels  

Science Conference Proceedings (OSTI)

This study proposes a novel technique for computing cloud feedbacks using histograms of cloud fraction as a joint function of cloud-top pressure (CTP) and optical depth (?). These histograms were generated by the International Satellite Cloud ...

Mark D. Zelinka; Stephen A. Klein; Dennis L. Hartmann

2012-06-01T23:59:59.000Z

318

Rope Cloud over Land  

Science Conference Proceedings (OSTI)

Satellite imagery is used to document several rope clouds over the southeastern Unites States. Surface and upper-air data are examined for one of the rope clouds and possible reasons for the development and maintenance of this type cloud line are ...

Von S. Woods

1983-03-01T23:59:59.000Z

319

User Centric Community Clouds  

Science Conference Proceedings (OSTI)

With the evolution in cloud technologies, users are becoming acquainted with seamless service provision. Nevertheless, clouds are not a user centric technology, and users become completely dependent on service providers. We propose a novel concept for ... Keywords: Cloud infrastructure, Identity management, User-centric systems

João Paulo Barraca; Alfredo Matos; Rui L. Aguiar

2011-05-01T23:59:59.000Z

320

ARM KAZR-ARSCL Value Added Product  

DOE Data Explorer (OSTI)

The Ka-band ARM Zenith Radars (KAZRs) have replaced the long-serving Millimeter Cloud Radars, or MMCRs. Accordingly, the primary MMCR Value Added Product (VAP), the Active Remote Sensing of CLouds (ARSCL) product, is being replaced by a KAZR-based version, the KAZR-ARSCL VAP. KAZR-ARSCL provides cloud boundaries and best-estimate time-height fields of radar moments.

Michael Jensen

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

ARM KAZR-ARSCL Value Added Product  

SciTech Connect

The Ka-band ARM Zenith Radars (KAZRs) have replaced the long-serving Millimeter Cloud Radars, or MMCRs. Accordingly, the primary MMCR Value Added Product (VAP), the Active Remote Sensing of CLouds (ARSCL) product, is being replaced by a KAZR-based version, the KAZR-ARSCL VAP. KAZR-ARSCL provides cloud boundaries and best-estimate time-height fields of radar moments.

Michael Jensen

2012-09-28T23:59:59.000Z

322

A Comparison of AgI and CO2 Seeding Effects in Alberta Cumulus Clouds  

Science Conference Proceedings (OSTI)

Three convective clouds extending above a stratocumulus layer were identified as being seedable on one day and were then seeded in a random sequence with CO2 pellets, a placebo and droppable AgI flares. The radar and microphysical seeding effects ...

Marianne English; John D. Marwitz

1981-05-01T23:59:59.000Z

323

Cloud-to-Ground Lightning throughout the Lifetime of a Severe Storm System in Oklahoma  

Science Conference Proceedings (OSTI)

Cloud-to-ground (CG) lightning data are examined relative to digitized radar data for a storm system that occurred in Oklahoma on 26 May 1985. This system evolved through three stages: 1) two lines of cells, one near the dryline and the other 60 ...

Mark A. Shafer; Donald R. MacGorman; Frederick H. Carr

2000-06-01T23:59:59.000Z

324

Millimeter wave analysis of the dielectric properties of oil shales  

E-Print Network (OSTI)

Natural sedimentation processes give rise to fine layers in shales. If these layers alternate between organic-rich and organic-poor sediments, then the contrast in dielectric properties gives rise to an effective birefringence as the presence of hydrocarbons suppresses the dielectric constant of the host rock. We have measured these effects with a quasioptical millimeter wave setup that is rapid and noncontacting. We find that the strength of this birefringence and the overall dielectric permittivity provide two useful diagnostic of the organic content of oil shales.

John A. Scales; Michael Batzle

2006-06-06T23:59:59.000Z

325

Advanced Millimeter-Wave Security Portal Imaging Techniques  

Science Conference Proceedings (OSTI)

Millimeter-wave imaging is rapidly gaining acceptance for passenger screening at airports and other secured facilities. This paper details a number of techniques developed over the last several years including novel image reconstruction and display techniques, polarimetric imaging techniques, array switching schemes, as well as high frequency high bandwidth techniques. Implementation of some of these methods will increase the cost and complexity of the mm-wave security portal imaging systems. RF photonic methods may provide new solutions to the design and development of the sequentially switched linear mm-wave arrays that are the key element in the mm-wave portal imaging systems.

Sheen, David M.; Bernacki, Bruce E.; McMakin, Douglas L.

2012-04-01T23:59:59.000Z

326

Documenting the Life and Death of Clouds | U.S. DOE Office of Science (SC)  

NLE Websites -- All DOE Office Websites (Extended Search)

Documenting Documenting the Life and Death of Clouds News Featured Articles 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 Science Headlines Presentations & Testimony News Archives Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 12.08.11 Documenting the Life and Death of Clouds Office of Science presents results from the world's biggest radar laboratory. Print Text Size: A A A Subscribe FeedbackShare Page Click to enlarge photo. Enlarge Photo A crane positions the topmost portion of the X-band scanning ARM precipitation radar (X-SAPR). ARM Climate Research Facility A crane positions the topmost portion of the X-band scanning ARM precipitation radar (X-SAPR). Today, researchers at the Office of Science's Energy's Atmospheric

327

Molecular oxygen in the rho Ophiuchi cloud  

E-Print Network (OSTI)

Molecular oxygen, O2 has been expected historically to be an abundant component of the chemical species in molecular clouds and, as such, an important coolant of the dense interstellar medium. However, a number of attempts from both ground and from space have failed to detect O2 emission. The work described here uses heterodyne spectroscopy from space to search for molecular oxygen in the interstellar medium. The Odin satellite carries a 1.1 m sub-millimeter dish and a dedicated 119 GHz receiver for the ground state line of O2. Starting in 2002, the star forming molecular cloud core rho Oph A was observed with Odin for 34 days during several observing runs. We detect a spectral line at v(LSR) = 3.5 km/s with dv(FWHM) = 1.5 km/s, parameters which are also common to other species associated with rho Ohp A. This feature is identified as the O2 (N_J = 1_1 - 1_0) transition at 118 750.343 MHz. The abundance of molecular oxygen, relative to H2,, is 5E-8 averaged over the Odin beam. This abundance is consistently lower than previously reported upper limits.

B. Larsson; R. Liseau; L. Pagani; P. Bergman; P. Bernath; N. Biver; J. H. Black; R. S. Booth; V. Buat; J. Crovisier; C. L. Curry; M. Dahlgren; P. J. Encrenaz; E. Falgarone; P. A. Feldman; M. Fich; H. G. Flore'n; M. Fredrixon; U. Frisk; G. F. Gahm; M. Gerin; M. Hagstroem; J. Harju; T. Hasegawa; Aa. Hjalmarson; C. Horellou; L. E. B. Johansson; K. Justtanont; A. Klotz; E. Kyroelae; S. Kwok; A. Lecacheux; T. Liljestroem; E. J. Llewellyn; S. Lundin; G. Me'gie; G. F. Mitchell; D. Murtagh; L. H. Nordh; L. -Aa. Nyman; M. Olberg; A. O. H. Olofsson; G. Olofsson; H. Olofsson; G. Persson; R. Plume; H. Rickman; I. Ristorcelli; G. Rydbeck; Aa. Sandqvist; F. v. Sche'ele; G. Serra; S. Torchinsky; N. F. Tothill; K. Volk; T. Wiklind; C. D. Wilson; A. Winnberg; G. Witt

2007-02-19T23:59:59.000Z

328

Turbulent molecular clouds  

E-Print Network (OSTI)

Stars form within molecular clouds but our understanding of this fundamental process remains hampered by the complexity of the physics that drives their evolution. We review our observational and theoretical knowledge of molecular clouds trying to confront the two approaches wherever possible. After a broad presentation of the cold interstellar medium and molecular clouds, we emphasize the dynamical processes with special focus to turbulence and its impact on cloud evolution. We then review our knowledge of the velocity, density and magnetic fields. We end by openings towards new chemistry models and the links between molecular cloud structure and star--formation rates.

Hennebelle, Patrick

2012-01-01T23:59:59.000Z

329

Definition: Synthetic Aperture Radar | Open Energy Information  

Open Energy Info (EERE)

Aperture Radar Aperture Radar Jump to: navigation, search Dictionary.png Synthetic Aperture Radar Synthetic-aperture radar (SAR) is an active microwave remote sensing technology that measures the phase difference between a radar wave emitted from an antennae attached to a satellite or aircraft to generate high-resolution images of a surface.[1] View on Wikipedia Wikipedia Definition Also Known As SAR Related Terms radar References ↑ Synthetic Aperature Radar: Systems and Signal Processing (Curlander and McDonough - 1991 - book) fue LikeLike UnlikeLike You like this.Sign Up to see what your friends like. l cell, Retrieved from "http://en.openei.org/w/index.php?title=Definition:Synthetic_Aperture_Radar&oldid=493069" Category: Definitions What links here Related changes

330

A Bistatic Multiple-Doppler Radar Network  

Science Conference Proceedings (OSTI)

A multiple-Doppler radar network can be constructed using only one, traditional, transmitting pencil-beam radar and one or more passive, low-gain, nontransmitting receivers at remote sites. Radiation scattered from the pencil beam of the ...

Joshua Wurman; Stanley Heckman; Dennis Boccippio

1993-12-01T23:59:59.000Z

331

Radar Detection of Turbulence in Precipitation Environments  

Science Conference Proceedings (OSTI)

Imperfect particle tracer response is incorporated into the relations describing the turbulent air motion contribution to Doppler radar spectrum mean and variance. Tracer effects on radar estimates of the eddy dissipation rate (?) increase with ...

Alan R. Bohne

1982-08-01T23:59:59.000Z

332

Understanding Radar Refractivity: Sources of Uncertainty  

Science Conference Proceedings (OSTI)

This study presents a 2-yr-long comparison of Weather Surveillance Radar-1988 Doppler (WSR-88D) refractivity retrievals with Oklahoma Mesonetwork (“Mesonet”) and sounding measurements and discusses some challenges to implementing radar ...

David Bodine; Dan Michaud; Robert D. Palmer; Pamela L. Heinselman; Jerry Brotzge; Nick Gasperoni; Boon Leng Cheong; Ming Xue; Jidong Gao

2011-12-01T23:59:59.000Z

333

Airborne Doppler Radar Data Analysis Workshop  

Science Conference Proceedings (OSTI)

The Airborne Doppler Radar Data Analysis Workshop, sponsored by the Atmospheric Technology Division (ATD) of the National Center for Atmospheric Research (NCAR), was the first to focus on analyzing airborne Doppler radar data. The workshop (held ...

Wen-Chau Lee; Frank D. Marks; Craig Walther

2003-08-01T23:59:59.000Z

334

Doppler Radar Sampling Limitations in Convective Storms  

Science Conference Proceedings (OSTI)

Vertical air motion data from a T-28 aircraft were filtered and sampled to simulate Doppler radar measurements. The results suggest that multiple Doppler radar analyses are subject to potentially large spatial aliasing errors in deep convection ...

R. E. Carbone; M. J. Carpenter; C. D. Burghart

1985-09-01T23:59:59.000Z

335

Obstacle penetrating dynamic radar imaging system  

DOE Patents (OSTI)

An obstacle penetrating dynamic radar imaging system for the detection, tracking, and imaging of an individual, animal, or object comprising a multiplicity of low power ultra wideband radar units that produce a set of return radar signals from the individual, animal, or object, and a processing system for said set of return radar signals for detection, tracking, and imaging of the individual, animal, or object. The system provides a radar video system for detecting and tracking an individual, animal, or object by producing a set of return radar signals from the individual, animal, or object with a multiplicity of low power ultra wideband radar units, and processing said set of return radar signals for detecting and tracking of the individual, animal, or object.

Romero, Carlos E. (Livermore, CA); Zumstein, James E. (Livermore, CA); Chang, John T. (Danville, CA); Leach, Jr.. Richard R. (Castro Valley, CA)

2006-12-12T23:59:59.000Z

336

Optimal Planning of a Weather Radar Network  

Science Conference Proceedings (OSTI)

An approach to the optimal planning of a weather radar network is presented. In the approach, several aspects affecting the planning decision, including terrain blockage, the need to measure with two Doppler weather radars in some regions, and ...

R. Minciardi; R. Sacile; F. Siccardi

2003-09-01T23:59:59.000Z

337

Synthetic Aperture Radar Imagery -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Synthetic Aperture Radar Imagery Sandia has collected and real-time processed over 400,000 synthetic aperture radar images. The following is a selection of imagery available for...

338

Operational Application of Meteorological Doppler Radar  

Science Conference Proceedings (OSTI)

Single Doppler weather radar velocity and reflectivity fields have been obtained with the National Center for Atmospheric Research (NCAR) 5 cm radars for a wide variety of weather situations. Among those weather features that can be identified by ...

James Wilson; Richard Carbone; Harold Baynton; Robert Serafin

1980-10-01T23:59:59.000Z

339

ARM - Publications: Science Team Meeting Documents  

NLE Websites -- All DOE Office Websites (Extended Search)

A Compact Millimeter-Wave Radar for UAV Applications A Compact Millimeter-Wave Radar for UAV Applications Bambha, R., Carswell, J., and Swift, C., University of Massachusetts Ninth Atmospheric Radiation Measurement (ARM) Science Team Meeting Assembly of the Compact Millimeter-wave Radar (CMR) has been completed at the University of Massachusetts, and ground-based cloud measurements have been acquired. The CMR is a 95-GHz solid-state radar intended for airborne cloud measurements. Funding for the project was provided by the Atmospheric Radiation Measurement-Unmanned Aerospace Vehicle (ARM-UAV) program with the eventual goal of developing a radar capable of operating on the Altus UAV. Simultaneous measurements made by CMR and the Cloud Profiling Radar System (CPRS) have been made to evaluate CMR's performance. CPRS is a larger

340

Influence of skin effect on the series resistance of millimeter-wave IMPATT devices  

Science Conference Proceedings (OSTI)

An attempt is made in this paper to study the influence of skin depth on the parasitic series resistance of millimeter-wave IMPATT devices based on Silicon. The method is based on the concept of depletion width modulation of the device under large-signal ... Keywords: Large-signal simulation, Millimeter-wave IMPATTs, Series resistance, Skin effect

Aritra Acharyya, Suranjana Banerjee, J. P. Banerjee

2013-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

ARMAR: An Airborne Rain-Mapping Radar  

Science Conference Proceedings (OSTI)

A new airborne rain-mapping radar (ARMAR) has been developed by NASA and the Jet Propulsion Laboratory for operation on the NASA Ames DC-8 aircraft. The radar operates at 13.8 GHz, the frequency to be used by the radar on the Tropical Rainfall ...

S. L. Durden; E. Im; F. K. Li; W. Ricketts; A. Tanner; W. Wilson

1994-06-01T23:59:59.000Z

342

Cloud Properties Working Group Low Clouds Update  

NLE Websites -- All DOE Office Websites (Extended Search)

Cloud Properties Working Group Cloud Properties Working Group Low Clouds Update Low Clouds Update Jennifer Comstock Jennifer Comstock Dave Turner Dave Turner Andy Andy Vogelmann Vogelmann Instruments Instruments 90/150 GHz microwave radiometer 90/150 GHz microwave radiometer Deployed during COPS AMF Deployed during COPS AMF Exploring calibration w/ DPR ( Exploring calibration w/ DPR ( Crewell Crewell & & L L ö ö hnert hnert ) ) See COPS Breakout, Wednesday evening See COPS Breakout, Wednesday evening 183 GHz (GVR) deployed at the NSA 183 GHz (GVR) deployed at the NSA Neural network algorithm to retrieve PWV & LWP (Maria Neural network algorithm to retrieve PWV & LWP (Maria Cadeddu Cadeddu ) ) Potential VAP candidate (RPWG) Potential VAP candidate (RPWG)

343

Cloud displays for mobile users in a display cloud  

Science Conference Proceedings (OSTI)

The display cloud model allows users to select local and remote programmable displays, and add them to a user specific cloud display where the user can arrange them freely. On a cloud display, the abstraction representing remote graphical content is ... Keywords: cloud displays, display clouds, ubiquitous displays

Lars Tiede; John Markus Bjørndalen; Otto J. Anshus

2013-02-01T23:59:59.000Z

344

Microwave emissions from police radar  

E-Print Network (OSTI)

The purpose of this study was to evaluate police officers exposures to microwaves emitted by traffic radar units at the ocular and testicular level. Additionally, comparisons were made of the radar manufacturers published maximum power density specifications and actual measured power densities taken at the antenna face of those units. Four different speed enforcement agencies and one transportation research institute provided fifty four different radar units for evaluation. Of those units, nine dash mounted. five rear mounted, and three hand held models were included. During this study, only four of the 986 measurements taken exceeded the American National Standards Institute(ANSI) limit of 5 MW/CM2 , and none exceeded the American Conference of Governmental Industrial Hygienists(ACGIH), Institute of Electrical and Electronic Engineers(IEEE), or Occupational Safety and Health Administration(OSHA) standard of 10 MW/CM2 . None of the 812 measurements taken at the officers seated ocular and testicular positions exceeded .04 MW/CM2. In fact, the highest reading observed in the drivers' position was .034 MW/CM2 taken at the 5th percentile testicular level, less than 1% of the lowest current safety standard. Because of the confusion that exists in the medical and scientific communities concerning non-ionizing radiation, the extent of health risks associated with long term exposure to police radar is not yet known. Until science has indisputably proven that long term, low power exposure is not harmful, it is recommended that police departments take steps to limit officer exposure. There are several ways that police departments can limit exposure cheaply and with minimal effort. The purchasing department should first consider radar units with the lowest published maximum power densities. New hand held radar units should not be purchased because they leave open the opportunity for operators to place their bodies in the radar beam path. Purchasing units whose antennae mount outside the patrol vehicle will also lower exposure to microwaves. Finally, training that stresses the importance of using the radar units' stand-by mode when not actually monitoring traffic will further limit exposure.

Fink, John Michael

1994-01-01T23:59:59.000Z

345

Climatology and Formation of Tropical Midlevel Clouds at the Darwin ARM Site  

SciTech Connect

A 4-yr climatology of midlevel clouds is presented from vertically pointing cloud lidar and radar measurements at the Atmospheric Radiation Measurement Program (ARM) site at Darwin, Australia. Few studies exist of tropical midlevel clouds using a dataset of this length. Seventy percent of clouds with top heights between 4 and 8 km are less than 2 km thick. These thin layer clouds have a peak in cloud-top temperature around the melting level (0°C) and also a second peak around -12.5°C. The diurnal frequency of thin clouds is highest during the night and reaches a minimum around noon, consistent with variation caused by solar heating. Using a 1.5-yr subset of the observations, the authors found that thin clouds have a high probability of containing supercooled liquid water at low temperatures: ~20% of clouds at -30°C, ~50% of clouds at -20°C, and ~65% of clouds at -10°C contain supercooled liquid water. The authors hypothesize that thin midlevel clouds formed at the melting level are formed differently during active and break monsoon periods and test this over three monsoon seasons. A greater frequency of thin midlevel clouds are likely formed by increased condensation following the latent cooling of melting during active monsoon periods when stratiform precipitation is most frequent. This is supported by the high percentage (65%) of midlevel clouds with preceding stratiform precipitation and the high frequency of stable layers slightly warmer than 0°C. In the break monsoon, a distinct peak in the frequency of stable layers at 0°C matches the peak in thin midlevel cloudiness, consistent with detrainment from convection.

Riihimaki, Laura D.; McFarlane, Sally A.; Comstock, Jennifer M.

2012-10-01T23:59:59.000Z

346

ARM - PI Product - SGP and TWP (Manus) Ice Cloud Vertical Velocities  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsSGP and TWP (Manus) Ice Cloud Vertical ProductsSGP and TWP (Manus) Ice Cloud Vertical Velocities Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send PI Product : SGP and TWP (Manus) Ice Cloud Vertical Velocities 1997.01.01 - 2010.12.31 Site(s) SGP TWP General Description Daily netcdf-files of ice-cloud dynamics observed at the ARM sites at SGP (Jan1997-Dec2010) and Manus (Jul1999-Dec2010). The files include variables at different time resolution (10s, 20min, 1hr). Profiles of radar reflectivity factor (dbz), Doppler velocity (vel) as well as retrieved vertical air motion (V_air) and reflectivity-weighted particle terminal fall velocity (V_ter) are given at 10s, 20min and 1hr resolution. Lower level clouds are removed, however a multi-layer flag is included.

347

The melting layer: The radar bright band is dark for lidar  

E-Print Network (OSTI)

Measurements of the melting layer were made with radar and lidar, during light rain. At the height at which a weather radar sees a bright band, the backscatter from the lidar has a minimum. Sometimes this minimum is more than 20 dB deep relative to the rain underneath. In this paper the measurements will be analysed in detail. Five mechanisms that can contribute to this effect are discussed: 1. Refractive index change during melting; 2. Aggregation and breakup; 3. Structural collapse of the melting snowflake; 4. Enhanced vertical backscatter of water droplets; 5. The orientation and shape of the melting crystals. Keywords: radar, cloud radar, lidar, melting layer, orientation of crystals. 1. Introduction In the Netherlands stratiform rain is mainly produced by the melting of ice particles into rain droplets. Normally this happens in a well-defined layer, just below the zero degree level. This melting layer is characterised by high radar reflections, the so-called bright band. This b...

V. K. C. Venema; H. W. J. Russchenberg; A van Lammeren; A. Apituley; L.P. Ligthart; Royal Netherl; S Meteorological Organisation

1998-01-01T23:59:59.000Z

348

Sidelobe Contamination in Bistatic Radars  

Science Conference Proceedings (OSTI)

The problem of sidelobe contamination in a bistatic network is explored. The McGill bistatic network consists of one S-band Doppler radar and two low-gain passive receivers at remote sites. Operational experience with the bistatic network ...

Ramón de Elía; Isztar Zawadzki

2000-10-01T23:59:59.000Z

349

Field Training in Radar Meteorology  

Science Conference Proceedings (OSTI)

The NSF Division of Mesoscale Meteorology and the University of Nevada—Reno (UNR) provided support for a two-week field course at the CSU—CHILL radar during 12—24 May 1991. Ten atmospheric science graduate students and two faculty from the Desert ...

John Hallett; Melanie Wetzel; Steven Rutledge

1993-01-01T23:59:59.000Z

350

Argonne National Laboratory Terahertz- and Millimeter-Wave Test Facility  

NLE Websites -- All DOE Office Websites (Extended Search)

PROFILE: PROFILE: Argonne Homeland Security Technologies APPLICATIONS A R G O N N E N A T I O N A L L A B O R A T O R Y Terahertz- and Millimeter-Wave Test Facility B E N E F I T S Detect Terrorist-Related Contraband with Terahertz Technology * Spectral "fingerprints" uniquely identify materials * Can identify the factory where explosives and other chemicals were manufactured * Detects minute amounts of chemicals from a distance * Identifies materials in seconds Companies that develop or manufacture instruments to detect terrorist contraband can benefit by using a unique facility at the U.S. Department of Energy's Argonne National Laboratory. Called the Terahertz Test Facility, its sensitive, new instruments - developed at Argonne and available nowhere else in the world - can obtain spectral "fingerprints" that uniquely

351

Passive Millimeter-Wave Spectrometer for Remote Chemical Detection  

NLE Websites -- All DOE Office Websites (Extended Search)

Closed Captioning Transcript Closed Captioning Transcript Welcome to a demonstration of the Passive Millimeter-Wave Spectrometer for Remote Chemical Detection. The ultimate goal of the project was to detect a hot target gas in front of a cooler background. This setup was eventually tested at the Nevada Test Site. Prior to field test we tested the concept in a laboratory. We simulated the field conditions by simultaneously reducing the two relative temperatures. In this demonstration we will show a room temperature gas (CH3CN) with a cold background (liquid nitrogen). To understand the experiment we will be showing, the first subplot here represents all data channels plotted on a single plot, the second plot represents a two-dimensional representation of the same data, the X axis represents time, the Y axis represents frequency. As the plot is animated later the first and second subplots will have a cross section marker sweep across them.

352

Remote detection of chemicals with passive millimeter waves.  

Science Conference Proceedings (OSTI)

Passive millimeter-wave (mmW) systems have been used in the past to remotely map solid targets and to measure low-pressure spectral lines of stratospheric and interstellar gases; however, its application to pressure-broadened spectral detection of terrestrial gases is new. A radiative transfer model was developed to determine the detection feasibility and system requirements for passive mmW spectral detection. A Dicke-switched multispectral radiometer that operates at 146-154 GHz was designed and built for remote detection of stack gases. The radiometer was tested in the laboratory using a gas cell; the spectra of acetonitrile were detected passively against a cold background, which mimicked typical remote detection scenarios in the field. With Dicke-switched integration of radiometric signals, on-line calibration, and novel signal processing to minimize atmospheric fluctuation, spectral line detection of polar molecules is possible from chemical plumes a few kilometers away.

Gopalsami, N.; Bakhtiari, S.; Elmer, T. W.; Raptis, A. C.; Nuclear Engineering Division

2006-01-01T23:59:59.000Z

353

Broadband notch filter design for millimeter-wave plasma diagnostics  

Science Conference Proceedings (OSTI)

Notch filters are integrated in plasma diagnostic systems to protect millimeter-wave receivers from intensive stray radiation. Here we present a design of a notch filter with a center frequency of 140 GHz, a rejection bandwidth of {approx}900 MHz, and a typical insertion loss below 2 dB in the passband of {+-}9 GHz. The design is based on a fundamental rectangular waveguide with eight cylindrical cavities coupled by T-junction apertures formed as thin slits. Parameters that affect the notch performance such as physical lengths and conductor materials are discussed. The excited resonance mode in the cylindrical cavities is the fundamental TE{sub 11}. The performance of the constructed filter is measured using a vector network analyzer monitoring a total bandwidth of 30 GHz. We compare the measurements with numerical simulations.

Furtula, V.; Michelsen, P. K.; Leipold, F.; Salewski, M.; Korsholm, S. B.; Meo, F.; Nielsen, S. K.; Stejner, M.; Moseev, D. [Association Euratom-Risoe National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000 Roskilde (Denmark); Johansen, T. [DTU Elektro, Technical University of Denmark, DK-2800 Lyngby (Denmark)

2010-10-15T23:59:59.000Z

354

BNL | Cloud Lifecycle Research  

NLE Websites -- All DOE Office Websites (Extended Search)

to be one of the major sources of uncertainty in numerical simulations of climate and weather. Improvement of the representation of clouds in numerical models requires fundamental...

355

Dispersion of Cloud Droplet Size Distributions, Cloud Parameterization...  

NLE Websites -- All DOE Office Websites (Extended Search)

National Laboratory Upton, New York Introduction Most studies of the effect of aerosols on cloud radiative properties have considered only changes in the cloud droplet...

356

Cloud Classification Before Luke Howard  

Science Conference Proceedings (OSTI)

A brief outline of the history of cloud painting prior to the first cloud classification schemes of Luke Howard and Lamarck is presented. It is shown that European painters had accurately represented most of the different cloud forms between ...

Stanely David Gedzelman

1989-04-01T23:59:59.000Z

357

A Climatology of Surface Cloud Radiative Effects at the ARM Tropical Western Pacific Sites  

SciTech Connect

Cloud radiative effects on surface downwelling fluxes are investigated using long-term datasets from the three Atmospheric Radiation Measurement (ARM) sites in the Tropical Western Pacific (TWP) region. The Nauru and Darwin sites show significant variability in sky cover, downwelling radiative fluxes, and surface cloud radiative effect (CRE) due to El Niño and the Australian monsoon, respectively, while the Manus site shows little intra-seasonal or interannual variability. Cloud radar measurement of cloud base and top heights are used to define cloud types so that the effect of cloud type on the surface CRE can be examined. Clouds with low bases contribute 71-75% of the surface shortwave (SW) CRE and 66-74% of the surface longwave (LW) CRE at the three TWP sites, while clouds with mid-level bases contribute 8-9% of the SW CRE and 12-14% of the LW CRE, and clouds with high bases contribute 16-19% of the SW CRE and 15-21% of the LW CRE.

McFarlane, Sally A.; Long, Charles N.; Flaherty, Julia E.

2013-04-01T23:59:59.000Z

358

Using Surface Remote Sensors to Derive Mixed-Phase Cloud Radiative Forcing:  

NLE Websites -- All DOE Office Websites (Extended Search)

Using Surface Remote Sensors to Derive Mixed-Phase Cloud Radiative Forcing: Using Surface Remote Sensors to Derive Mixed-Phase Cloud Radiative Forcing: An Example from M-PACE Title Using Surface Remote Sensors to Derive Mixed-Phase Cloud Radiative Forcing: An Example from M-PACE Publication Type Journal Article Year of Publication 2011 Authors de Boer, Gijs, William D. Collins, Surabi Menon, and Charles N. Long Journal Atmospheric Chemistry and Physics Volume 11 Start Page 11937 Pagination 11937-11949 Abstract Measurements from ground-based cloud radar, high spectral resolution lidar and microwave radiometer are used in conjunction with a column version of the Rapid Radiative Transfer Model (RRTMG) and radiosonde measurements to derive the surface radiative properties under mixed-phase cloud conditions. These clouds were observed during the United States Department of Energy (US DOE) Atmospheric Radiation Measurement (ARM) Mixed-Phase Arctic Clouds Experiment (M-PACE) between September and November of 2004. In total, sixteen half hour time periods are reviewed due to their coincidence with radiosonde launches. Cloud liquid (ice) water paths are found to range between 11.0-366.4 (0.5-114.1) gm-2, and cloud physical thicknesses fall between 286-2075 m. Combined with temperature and hydrometeor size estimates, this information is used to calculate surface radiative flux densities using RRTMG, which are demonstrated to generally agree with measured flux densities from surface-based radiometric instrumentation. Errors in longwave flux density estimates are found to be largest for thin clouds, while shortwave flux density errors are generally largest for thicker clouds. A sensitivity study is performed to understand the impact of retrieval assumptions and uncertainties on derived surface radiation estimates. Cloud radiative forcing is calculated for all profiles, illustrating longwave dominance during this time of year, with net cloud forcing generally between 50 and 90 Wm-2.

359

Comparison between a Three-Dimensional Simulation and Doppler Radar Data of a Tropical Squall Line: Transports of Mass, Momentum, Heat, and Moisture  

Science Conference Proceedings (OSTI)

Results from a detailed three-dimensional cloud model are extensively compared with Doppler radar data in the case of a fast-moving tropical squall line, observed during the COPT81 experiment. The comparisons use a two-dimensional statistical ...

Jean-Philippe Lafore; Jean-Luc Redelsperger; Geneviève Jaubert

1988-11-01T23:59:59.000Z

360

Lightning from Two National Detection Networks Related to Vertically Integrated Liquid and Echo-Top Information from WSR-88D Radar  

Science Conference Proceedings (OSTI)

Two national cloud-to-ground (CG) lightning-detection systems were operating across the contiguous United States during 1993. These two networks are compared to each other and to WSR-88D radar information collected by the Twin Lakes, Oklahoma, ...

Andrew I. Watson; Ronald L. Holle; RaúL. E. López

1995-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

A Comparison Of WSR-88D Reflectivities, SSM/I Brightness Temperatures, and Lightning for Mesoscale Convective Systems in Texas. Part I: Radar Reflectivity and Lightning  

Science Conference Proceedings (OSTI)

This is the first part of a two part study. Part I compares radar data from the League City, Texas, WSR-88D and cloud-to-ground (CG) lightning data for a set of eight mesoscale convective systems (MCSs), which occur at various stages of ...

E. Richard Toracinta; Karen I. Mohr; Edward J. Zipser; Richard E. Orville

1996-06-01T23:59:59.000Z

362

BNL | Aerosol, Cloud, Precipitation Interactions  

NLE Websites -- All DOE Office Websites (Extended Search)

Cloud-Aerosol-Precipitation Interactions Cloud-Aerosol-Precipitation Interactions Atmospheric aerosols exert important "indirect effects" on clouds and climate by serving as cloud condensation nuclei (CCN) and ice nuclei that affect cloud radiative and microphysical properties. For example, an increase in CCN increases the number concentration of droplets enhances cloud albedo, and suppresses precipitation that alters cloud coverage and lifetime. However, in the case of moist and strong convective clouds, increasing aerosols may increase precipitation and enhance storm development. Although aerosol-induced indirect effects on climate are believed to have a significant impact on global climate change, estimating their impact continues to be one of the most uncertain climate forcings.

363

Cloud Computing Forum & Workshop IV  

Science Conference Proceedings (OSTI)

Cloud Computing Forum & Workshop IV. ... NIST announces the Cloud Computing Forum & Workshop IV to be held on November 2, 3 and 4, 2011. ...

2013-08-07T23:59:59.000Z

364

CONTRIBUTED Green Cloud Computing  

E-Print Network (OSTI)

widely dis- cussed, the shift in energy usage in a cloud computing model has received little attention cloud computing services typically operate. We consider energy consumption models of the transport of energy per bit also allows the results to be easily scaled to any usage level. We consider both public

Tucker, Rod

365

Cryptographic cloud storage  

Science Conference Proceedings (OSTI)

We consider the problem of building a secure cloud storage service on top of a public cloud infrastructure where the service provider is not completely trusted by the customer. We describe, at a high level, several architectures that combine recent and ...

Seny Kamara; Kristin Lauter

2010-01-01T23:59:59.000Z

366

ARM - Measurement - Cloud extinction  

NLE Websites -- All DOE Office Websites (Extended Search)

extinction extinction ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Cloud extinction The removal of radiant energy from an incident beam by the process of cloud absorption and/or scattering. Categories Cloud Properties Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments NEPHELOMETER : Nephelometer Field Campaign Instruments CEP : Cloud Extinction Probe CLDAEROSMICRO : Cloud and Aerosol Microphysical Properties EC-CONVAIR580-BULK : Environment Canada Convair 580 Bulk Parameters

367

Lightning and radar observations of hurricane Rita landfall  

SciTech Connect

Los Alamos National Laboratory (LANL) owns and operates an array of Very-Low Frequency (VLF) sensors that measure the Radio-Frequency (RF) waveforms emitted by Cloud-to-Ground (CG) and InCloud (IC) lightning. This array, the Los Alamos Sferic Array (LASA), has approximately 15 sensors concentrated in the Great Plains and Florida, which detect electric field changes in a bandwidth from 200 Hz to 500 kHz (Smith et al., 2002). Recently, LANL has begun development of a new dual-band RF sensor array that includes the Very-High Frequency (VHF) band as well as the VLF. Whereas VLF lightning emissions can be used to deduce physical parameters such as lightning type and peak current, VHF emissions can be used to perform precise 3d mapping of individual radiation sources, which can number in the thousands for a typical CG flash. These new dual-band sensors will be used to monitor lightning activity in hurricanes in an effort to better predict intensification cycles. Although the new LANL dual-band array is not yet operational, we have begun initial work utilizing both VLF and VHF lightning data to monitor hurricane evolution. In this paper, we present the temporal evolution of Rita's landfall using VLF and VHF lightning data, and also WSR-88D radar. At landfall, Rita's northern eyewall experienced strong updrafts and significant lightning activity that appear to mark a transition between oceanic hurricane dynamics and continental thunderstorm dynamics. In section 2, we give a brief overview of Hurricane Rita, including its development as a hurricane and its lightning history. In the following section, we present WSR-88D data of Rita's landfall, including reflectivity images and temporal variation. In section 4, we present both VHF and VLF lightning data, overplotted on radar reflectivity images. Finally, we discuss our observations, including a comparison to previous studies and a brief conclusion.

Henderson, Bradley G [Los Alamos National Laboratory; Suszcynsky, David M [Los Alamos National Laboratory; Hamlin, Timothy E [Los Alamos National Laboratory; Jeffery, C A [Los Alamos National Laboratory; Wiens, Kyle C [TEXAS TECH U.; Orville, R E [TEXAS A& M

2009-01-01T23:59:59.000Z

368

Lightning and radar observations of hurricane Rita landfall  

SciTech Connect

Los Alamos National Laboratory (LANL) owns and operates an array of Very-Low Frequency (VLF) sensors that measure the Radio-Frequency (RF) waveforms emitted by Cloud-to-Ground (CG) and InCloud (IC) lightning. This array, the Los Alamos Sferic Array (LASA), has approximately 15 sensors concentrated in the Great Plains and Florida, which detect electric field changes in a bandwidth from 200 Hz to 500 kHz (Smith et al., 2002). Recently, LANL has begun development of a new dual-band RF sensor array that includes the Very-High Frequency (VHF) band as well as the VLF. Whereas VLF lightning emissions can be used to deduce physical parameters such as lightning type and peak current, VHF emissions can be used to perform precise 3d mapping of individual radiation sources, which can number in the thousands for a typical CG flash. These new dual-band sensors will be used to monitor lightning activity in hurricanes in an effort to better predict intensification cycles. Although the new LANL dual-band array is not yet operational, we have begun initial work utilizing both VLF and VHF lightning data to monitor hurricane evolution. In this paper, we present the temporal evolution of Rita's landfall using VLF and VHF lightning data, and also WSR-88D radar. At landfall, Rita's northern eyewall experienced strong updrafts and significant lightning activity that appear to mark a transition between oceanic hurricane dynamics and continental thunderstorm dynamics. In section 2, we give a brief overview of Hurricane Rita, including its development as a hurricane and its lightning history. In the following section, we present WSR-88D data of Rita's landfall, including reflectivity images and temporal variation. In section 4, we present both VHF and VLF lightning data, overplotted on radar reflectivity images. Finally, we discuss our observations, including a comparison to previous studies and a brief conclusion.

Henderson, Bradley G [Los Alamos National Laboratory; Suszcynsky, David M [Los Alamos National Laboratory; Hamlin, Timothy E [Los Alamos National Laboratory; Jeffery, C A [Los Alamos National Laboratory; Wiens, Kyle C [TEXAS TECH U.; Orville, R E [TEXAS A& M

2009-01-01T23:59:59.000Z

369

Observations of Quasi-Stationary and Shallow Orographic Snow Clouds: Spatial Distributions of Supercooled Liquid Water and Snow Particles  

Science Conference Proceedings (OSTI)

On 25 February 1999, due to a winter monsoon after a cyclonic storm, orographic snow clouds formed under conditions of weak cold advection on the western side of the central mountain range of Japan. In this study, the Ka-band Doppler radar and ...

Kenichi Kusunoki; Masataka Murakami; Narihiro Orikasa; Mizuho Hoshimoto; Yoshinobu Tanaka; Yoshinori Yamada; Hakaru Mizuno; Kyosuke Hamazu; Hideyuki Watanabe

2005-04-01T23:59:59.000Z

370

The Evolution of Cloud-to-Ground Lightning within a Portion of the 10–11 June 1985 Squall Line  

Science Conference Proceedings (OSTI)

The character of cloud-to-ground lightning is examined during the life cycle of a distinct mesoscale segment of the 10–11 June 1985 mesoscale convective system (MCS). Three phases of lightning activity are identified and related to both the radar-...

K. E. Nielsen; R. A. Maddox; S. V. Vasiloff

1994-08-01T23:59:59.000Z

371

ARM - Facility News Article  

NLE Websites -- All DOE Office Websites (Extended Search)

New Data Stream Available from Millimeter Wave Cloud Radar New Data Stream Available from Millimeter Wave Cloud Radar Bookmark and Share Inside the instrument shelter, the MMCR data system collects radar spectral data and processes these into reflectivity, vertical velocities, and spectral width. Inside the instrument shelter, the MMCR data system collects radar spectral data and processes these into reflectivity, vertical velocities, and spectral width. As a result of upgrades to the Millimeter Wave Cloud Radar (MMCR) processors (see http://www.arm.gov/acrf/updates051504.stm#nsammcr) at the ARM Climate Research Facility Southern Great Plains (SGP) and North Slope of Alaska (NSA) locales, two MMCR data streams-mmcrcalC1.a1 (calibration data) and mmcrmomentsC1.a1 (spectral "moments" data)-have been combined

372

Two terminal micropower radar sensor  

DOE Patents (OSTI)

A simple, low power ultra-wideband radar motion sensor/switch configuration connects a power source and load to ground. The switch is connected to and controlled by the signal output of a radar motion sensor. The power input of the motion sensor is connected to the load through a diode which conducts power to the motion sensor when the switch is open. A storage capacitor or rechargeable battery is connected to the power input of the motion sensor. The storage capacitor or battery is charged when the switch is open and powers the motion sensor when the switch is closed. The motion sensor and switch are connected between the same two terminals between the source/load and ground. 3 figs.

McEwan, T.E.

1995-11-07T23:59:59.000Z

373

Two terminal micropower radar sensor  

SciTech Connect

A simple, low power ultra-wideband radar motion sensor/switch configuration connects a power source and load to ground. The switch is connected to and controlled by the signal output of a radar motion sensor. The power input of the motion sensor is connected to the load through a diode which conducts power to the motion sensor when the switch is open. A storage capacitor or rechargeable battery is connected to the power input of the motion sensor. The storage capacitor or battery is charged when the switch is open and powers the motion sensor when the switch is closed. The motion sensor and switch are connected between the same two terminals between the source/load and ground.

McEwan, Thomas E. (Livermore, CA)

1995-01-01T23:59:59.000Z

374

High-Temporal-Resolution Capabilities of the National Weather Radar Testbed Phased-Array Radar  

Science Conference Proceedings (OSTI)

Since 2007 the advancement of the National Weather Radar Testbed Phased-Array Radar (NWRT PAR) hardware and software capabilities has been supporting the implementation of high-temporal-resolution (1 min) sampling. To achieve the increase in ...

Pamela L. Heinselman; Sebastián M. Torres

2011-03-01T23:59:59.000Z

375

Measurement of Atmospheric Aspect Sensitivity Using Coherent Radar Imaging after Mitigation of Radar Beam Weighting Effect  

Science Conference Proceedings (OSTI)

The aspect angle, a measurement of the aspect sensitivity of atmospheric refractivity irregularities, was estimated with multiple-receiver coherent radar imaging (CRI) of very high frequency (VHF) atmospheric radar. Two CRI parameters retrieved by ...

Jenn-Shyong Chen; Jun-ichi Furumoto

2013-02-01T23:59:59.000Z

376

The Use of TRMM Precipitation Radar Observations in Determining Ground Radar Calibration Biases  

Science Conference Proceedings (OSTI)

Since the successful launch of the Tropical Rainfall Measuring Mission (TRMM) satellite, measurements of a wide variety of precipitating systems have been obtained with unprecedented detail from the first space-based radar [precipitation radar (...

Emmanouil N. Anagnostou; Carlos A. Morales; Tufa Dinku

2001-04-01T23:59:59.000Z

377

Monitoring the Reflectivity Calibration of a Scanning Radar Using a Profiling Radar and a Disdrometer  

Science Conference Proceedings (OSTI)

This paper describes a method of absolutely calibrating and routinely monitoring the reflectivity calibration from a scanning weather radar using a vertically profiling radar that has been absolutely calibrated using a collocated surface ...

Christopher R. Williams; Kenneth S. Gage; Wallace Clark; Paul Kucera

2005-07-01T23:59:59.000Z

378

Small Cloud Particle Shapes in Mixed-Phase Clouds  

Science Conference Proceedings (OSTI)

The shapes of cloud particles with maximum dimensions Dmax between 35 and 60 ?m in mixed-phase clouds were studied using high-resolution particle images collected by a cloud particle imager (CPI) during the Mixed-Phase Arctic Cloud Experiment (M-...

Greg M. McFarquhar; Junshik Um; Robert Jackson

2013-05-01T23:59:59.000Z

379

Satellite Retrievals of Arctic and Equatorial Rain and Snowfall Rates Using Millimeter Wavelengths  

E-Print Network (OSTI)

A new global precipitation retrieval algorithm for the millimeter-wave Advanced Microwave Sounding Unit is presented that also retrieves Arctic precipitation rates over surface snow and ice. This algorithm improves upon ...

Surussavadee, Chinnawat

380

Millimeter-wave GaN high electron mobility transistors and their integration with silicon electronics  

E-Print Network (OSTI)

In spite of the great progress in performance achieved during the last few years, GaN high electron mobility transistors (HEMTs) still have several important issues to be solved for millimeter-wave (30 ~ 300 GHz) applications. ...

Chung, Jinwook W. (Jinwook Will)

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Novel millimeter wave sensor concepts for energy, environment, and national security  

E-Print Network (OSTI)

Millimeter waves are ideally suited for sensing and diagnosing materials, devices, and processes that are broadly important to energy, environment, and national security. Thermal return reflection (TRR) techniques that ...

Sundaram, S. K.

382

Cloud properties derived from two lidars over the ARM SGP site  

Science Conference Proceedings (OSTI)

[1] Active remote sensors such as lidars or radars can be used with other data to quantify the cloud properties at regional scale and at global scale (Dupont et al., 2009). Relative to radar, lidar remote sensing is sensitive to very thin and high clouds but has a significant limitation due to signal attenuation in the ability to precisely quantify the properties of clouds with a 20 cloud optical thickness larger than 3. In this study, 10-years of backscatter lidar signal data are analysed by a unique algorithm called STRucture of ATmosphere (STRAT, Morille et al., 2007). We apply the STRAT algorithm to data from both the collocated Micropulse lidar (MPL) and a Raman lidar (RL) at the Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) site between 1998 and 2009. Raw backscatter lidar signal is processed and 25 corrections for detector deadtime, afterpulse, and overlap are applied. (Campbell et al.) The cloud properties for all levels of clouds are derived and distributions of cloud base height (CBH), top height (CTH), physical cloud thickness (CT), and optical thickness (COT) from local statistics are compared. The goal of this study is (1) to establish a climatology of macrophysical and optical properties for all levels of clouds observed over the ARM SGP site 30 and (2) to estimate the discrepancies induced by the two remote sensing systems (pulse energy, sampling, resolution, etc.). Our first results tend to show that the MPLs, which are the primary ARM lidars, have a distinctly limited range where all of these cloud properties are detectable, especially cloud top and cloud thickness, but even actual cloud base especially during summer daytime period. According to the comparisons between RL and MPL, almost 50% of situations show a signal to noise ratio too low (smaller than 3) for the MPL in order to detect clouds higher than 7km during daytime period in summer. Consequently, the MPLderived annual cycle of cirrus cloud base (top) altitude is biased low, especially for daylight periods, compared with those derived from the RL data, which detects 5 cloud base ranging from 7.5 km in winter to 9.5 km in summer (and tops ranging from 8.6 to 10.5 km). The optically thickest cirrus clouds (COT>0.3) reach 50% of the total population for the Raman lidar and only 20% for the Micropulse lidar due to the difference of pulse energy and the effect of solar irradiance contamination. A complementary study using the cloud fraction 10 derived from the Micropulse lidar for clouds below 5 km and from the Raman lidar for cloud above 5 km allows for better estimation of the total cloud fraction between the ground and the top of the atmosphere. This study presents the diurnal cycle of cloud fraction for each season in comparisons with the Long et al. (2006) cloud fraction calculation derived from radiative flux analysis.

Dupont, Jean-Charles; Haeffelin, Martial; Morille, Y.; Comstock, Jennifer M.; Flynn, Connor J.; Long, Charles N.; Sivaraman, Chitra; Newsom, Rob K.

2011-02-16T23:59:59.000Z

383

Rapid Sampling of Severe Storms by the National Weather Radar Testbed Phased Array Radar  

Science Conference Proceedings (OSTI)

A key advantage of the National Weather Radar Testbed Phased Array Radar (PAR) is the capability to adaptively scan storms at higher temporal resolution than is possible with the Weather Surveillance Radar-1988 Doppler (WSR-88D): 1 min or less ...

Pamela L. Heinselman; David L. Priegnitz; Kevin L. Manross; Travis M. Smith; Richard W. Adams

2008-10-01T23:59:59.000Z

384

The 30th International Conference on Radar Meteorology  

Science Conference Proceedings (OSTI)

The 30th International Conference on Radar Meteorology, held in Munich, Germany, 19–24 July 2001, highlighted recent progress in the field of radar meteorology and demonstrated how radar is used in many integrated ways to better understand and ...

Matthias Steiner; Peter F. Meischner

2002-11-01T23:59:59.000Z

385

Ultra-wideband radar motion sensor  

DOE Patents (OSTI)

A motion sensor is based on ultra-wideband (UWB) radar. UWB radar range is determined by a pulse-echo interval. For motion detection, the sensors operate by staring at a fixed range and then sensing any change in the averaged radar reflectivity at that range. A sampling gate is opened at a fixed delay after the emission of a transmit pulse. The resultant sampling gate output is averaged over repeated pulses. Changes in the averaged sampling gate output represent changes in the radar reflectivity at a particular range, and thus motion. 15 figs.

McEwan, T.E.

1994-11-01T23:59:59.000Z

386

Cloud Computing Forensic Science Workshop  

Science Conference Proceedings (OSTI)

Cloud Computing Forensic Science Workshop. Purpose: The New Frontiers in IT and Measurement Science Rapid advances ...

2013-09-05T23:59:59.000Z

387

A marketplace for cloud resources  

Science Conference Proceedings (OSTI)

Cloud computing is an emerging paradigm aimed to offer users pay-per-use computing resources, while leaving the burden of managing the computing infrastructure to the cloud provider. We present a new programming and pricing model that gives the cloud ... Keywords: cloud computing, iaas, large-scale scheduling, pricing models, worst-case execution time

Thomas A. Henzinger; Anmol V. Singh; Vasu Singh; Thomas Wies; Damien Zufferey

2010-10-01T23:59:59.000Z

388

RESOLVING THE CIRCUMSTELLAR DISK OF HL TAURI AT MILLIMETER WAVELENGTHS  

SciTech Connect

We present results of high-resolution imaging toward HL Tau by the Combined Array for Research in Millimeter-wave Astronomy. We have obtained {lambda} = 1.3 mm and 2.7 mm dust continua with an angular resolution down to 0.''13. Through simultaneous model fitting to the two wavelength data sets in Bayesian inference using a flared viscous accretion disk model, we estimate the physical properties of HL Tau, such as density distribution, dust opacity spectral index, disk mass, disk size, inclination angle, position angle, and disk thickness. HL Tau has a circumstellar disk mass of 0.13 M{sub sun}, a characteristic radius of 79 AU, an inclination of 40{sup 0}, and a position angle of 136{sup 0}. Although a thin disk model is preferred by our two wavelength data sets, a thick disk model is needed to explain the high mid- and far-infrared emission of the HL Tau spectral energy distribution. This could imply large dust grains settled down on the midplane with fine dust grains mixed with gas. The HL Tau disk is likely gravitationally unstable and can be fragmented between 50 and 100 AU of radius. However, we did not detect dust thermal continuum supporting the protoplanet candidate claimed by a previous study using observations of the Very Large Array at {lambda} = 1.3 cm.

Kwon, Woojin; Looney, Leslie W. [Department of Astronomy, University of Illinois, Urbana, IL 61801 (United States); Mundy, Lee G., E-mail: wkwon@illinois.edu [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States)

2011-11-01T23:59:59.000Z

389

CDIAC Cloud Data Sets  

NLE Websites -- All DOE Office Websites (Extended Search)

Period of Record A Gridded Climatology of Clouds over Land (1971-1996) and Ocean (1954-2008) from Surface Observations Worldwide (CDIAC NDP-026E) C.J. Hahn and S.G. Warren...

390

ISCCP Cloud Data Products  

Science Conference Proceedings (OSTI)

The operational data collection phase of the International Satellite Cloud Climatology Project (ISCCP) began in July 1983. Since then, visible and infrared images from an international network of weather satellites have been routinely processed ...

William B. Rossow; Robert A. Schiffer

1991-01-01T23:59:59.000Z

391

Cloud Transmissivities for Canada  

Science Conference Proceedings (OSTI)

Transmissivities are determined for different cloud types using nine years of hourly irradiance measurements under overcast skies at six Canadian stations. Values for individual stations and for pooled data using irradiances uncorrected for ...

J. A. Davies; M. Abdel-Wahab; J. E. Howard

1985-03-01T23:59:59.000Z

392

Marine Cloud Brightening  

Science Conference Proceedings (OSTI)

The idea behind the marine cloud-brightening (MCB) geoengineering technique is that seeding marine stratocumulus clouds with copious quantities of roughly monodisperse sub-micrometre sea water particles might significantly enhance the cloud droplet number concentration, and thereby the cloud albedo and possibly longevity. This would produce a cooling, which general circulation model (GCM) computations suggest could - subject to satisfactory resolution of technical and scientific problems identified herein - have the capacity to balance global warming up to the carbon dioxide-doubling point. We describe herein an account of our recent research on a number of critical issues associated with MCB. This involves (i) GCM studies, which are our primary tools for evaluating globally the effectiveness of MCB, and assessing its climate impacts on rainfall amounts and distribution, and also polar sea-ice cover and thickness; (ii) high-resolution modelling of the effects of seeding on marine stratocumulus, which are required to understand the complex array of interacting processes involved in cloud brightening; (iii) microphysical modelling sensitivity studies, examining the influence of seeding amount, seedparticle salt-mass, air-mass characteristics, updraught speed and other parameters on cloud-albedo change; (iv) sea water spray-production techniques; (v) computational fluid dynamics studies of possible large-scale periodicities in Flettner rotors; and (vi) the planning of a three-stage limited-area field research experiment, with the primary objectives of technology testing and determining to what extent, if any, cloud albedo might be enhanced by seeding marine stratocumulus clouds on a spatial scale of around 100 km. We stress that there would be no justification for deployment of MCB unless it was clearly established that no significant adverse consequences would result. There would also need to be an international agreement firmly in favour of such action.

Latham, John; Bower, Keith; Choularton, Tom; Coe, H.; Connolly, P.; Cooper, Gary; Craft, Tim; Foster, Jack; Gadian, Alan; Galbraith, Lee; Iacovides, Hector; Johnston, David; Launder, Brian; Leslie, Brian; Meyer, John; Neukermans, Armand; Ormond, Bob; Parkes, Ben; Rasch, Philip J.; Rush, John; Salter, Stephen; Stevenson, Tom; Wang, Hailong; Wang, Qin; Wood, Robert

2012-09-07T23:59:59.000Z

393

FORMATION OF MASSIVE MOLECULAR CLOUD CORES BY CLOUD-CLOUD COLLISION  

SciTech Connect

Recent observations of molecular clouds around rich massive star clusters including NGC 3603, Westerlund 2, and M20 revealed that the formation of massive stars could be triggered by a cloud-cloud collision. By using three-dimensional, isothermal, magnetohydrodynamics simulations with the effect of self-gravity, we demonstrate that massive, gravitationally unstable, molecular cloud cores are formed behind the strong shock waves induced by cloud-cloud collision. We find that the massive molecular cloud cores have large effective Jeans mass owing to the enhancement of the magnetic field strength by shock compression and turbulence in the compressed layer. Our results predict that massive molecular cloud cores formed by the cloud-cloud collision are filamentary and threaded by magnetic fields perpendicular to the filament.

Inoue, Tsuyoshi [Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara, Kanagawa 252-5258 (Japan); Fukui, Yasuo, E-mail: inouety@phys.aoyama.ac.jp [Department of Physics, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602 (Japan)

2013-09-10T23:59:59.000Z

394

Retrieval of Precipitation Profiles from Airborne Radar and Passive Radiometer Measurements: Comparison with Dual-Frequency Radar Measurements  

Science Conference Proceedings (OSTI)

This study compares precipitation rate profiles derived from a single frequency radar and radiometer with such profiles derived from a dual-frequency radar.

J. A. Weinman; R. Meneghini; K. Nakamura

1990-10-01T23:59:59.000Z

395

Dense Star-forming Gas and Dust in the Magellanic Clouds  

E-Print Network (OSTI)

The early stages of star formation are closely related to the ambient conditions in the interstellar medium. Important questions such as dust abundance, size distribution, temperature distribution, fraction of molecular gas, fraction of dense gas, gas surface density and total amount of gas and dust require separation of metallicity and radiation effects. The Magellanic Clouds provide an ideal laboratory to carry out such studies. They are prominent targets for space observatories (Spitzer, Herschel), but an important role remains for large groundbased facilities, such as a 25 m class sub-millimeter telescope on Dome C.

Israel, F P

2009-01-01T23:59:59.000Z

396

Radar Determination of Snowfall Rate and Accumulation  

Science Conference Proceedings (OSTI)

A unique method that provides for relating radar-measured reflectivity factors to snowfall rates at the ground is presented. Data were provided by a CPS-9, 3.2 cm radar from six 1978 Massachusetts snowstorms A best-fit power-law relationship ...

Roland J. Boucher; James G. Wieler

1985-01-01T23:59:59.000Z

397

Helicopter discrimination apparatus for the murine radar  

DOE Patents (OSTI)

A helicopter discrimination apparatus for a radar utilizing doppler filtering to discriminate between a missile and ground clutter. The short duration of the doppler filter pulses which are emitted by helicopter rotor blades are processed to prevent false alarms, thus allowing the radar-protected helicopter to operate in formation with other helicopters while maintaining protection against infra-red-seeking missiles.

Webb, Jr., John G. (Sandia Park, NM); Gray, Roger M. (Dallas, TX)

1977-01-01T23:59:59.000Z

398

Ultra-wideband radar sensors and networks  

DOE Patents (OSTI)

Ultra wideband radar motion sensors strategically placed in an area of interest communicate with a wireless ad hoc network to provide remote area surveillance. Swept range impulse radar and a heart and respiration monitor combined with the motion sensor further improves discrimination.

Leach, Jr., Richard R; Nekoogar, Faranak; Haugen, Peter C

2013-08-06T23:59:59.000Z

399

Cirrus Clouds. Part I: A Cirrus Cloud Model  

Science Conference Proceedings (OSTI)

A two-dimensional (x, z), time-dependent, numerical cloud model is developed for the purpose of investigating the role of various physical processes involved in the maintenance of cirriform clouds. In addition to accounting for dynamic and ...

David O'C. Starr; Stephen K. Cox

1985-12-01T23:59:59.000Z

400

On the Use of Cloud Forcing to Estimate Cloud Feedback  

Science Conference Proceedings (OSTI)

Uncertainty in cloud feedback is the leading cause of discrepancy in model predictions of climate change. The use of observed or model-simulated radiative fluxes to diagnose the effect of clouds on climate sensitivity requires an accurate ...

Brian J. Soden; Anthony J. Broccoli; Richard S. Hemler

2004-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Comparisons of CCN with Supercooled Clouds  

Science Conference Proceedings (OSTI)

More than 140 supercooled clouds were compared with corresponding out-of-cloud cloud condensation nuclei (CCN) measurements. In spite of significant differences in altitude, temperature, distances from cloud base, updraft velocity (W), ...

James G. Hudson; Stephen Noble; Vandana Jha

2010-09-01T23:59:59.000Z

402

Effects of CCN Concentrations on Stratus Clouds  

Science Conference Proceedings (OSTI)

Comparisons between cloud-base CCN concentrations and cloud droplet concentrations in stratus clouds over San Diego and 100 km out to sea showed a positive correlation. The supersaturation in these clouds, as derived from the matching of the CCN ...

James G. Hudson

1983-02-01T23:59:59.000Z

403

More Observations of Small Funnel Clouds and Other Tubular Clouds  

Science Conference Proceedings (OSTI)

In this brief contribution, photographic documentation is provided of a variety of small, tubular-shaped clouds and of a small funnel cloud pendant from a convective cloud that appears to have been modified by flow over high-altitude mountains in ...

Howard B. Bluestein

2005-12-01T23:59:59.000Z

404

ETSI CLOUD - initial standardization requirements for cloud services  

Science Conference Proceedings (OSTI)

While the technological basis for cloud services is relatively mature, the development of the market is still at an early stage. There is considerable potential, but also a number of widely held concerns which are inhibiting mainstream adoption of cloud ... Keywords: ETSI, cloud services, standardization

Karsten Oberle; Mike Fisher

2010-08-01T23:59:59.000Z

405

Observations of Cloud-Top Entrainment in Marine Stratocumulus Clouds  

Science Conference Proceedings (OSTI)

Measurements of the thermodynamic and dynamic properties of entrainment events in marine stratocumulus are used to explain why cloud-top entrainment instability may not lead to the breakup of the clouds and to define the role of cloud-top ...

Qing Wang; Bruce A. Albrecht

1994-06-01T23:59:59.000Z

406

The Magellan Final Report on Cloud Computing  

E-Print Network (OSTI)

resources. 1. Finding Tropical Cyclones on a Cloud Computing2010 2. Finding Tropical Cyclones on Clouds, D. Hasenkamp

Coghlan, Susan

2013-01-01T23:59:59.000Z

407

Ash cloud aviation advisories  

SciTech Connect

During the recent (12--22 June 1991) Mount Pinatubo volcano eruptions, the US Air Force Global Weather Central (AFGWC) requested assistance of the US Department of Energy`s Atmospheric Release Advisory Capability (ARAC) in creating volcanic ash cloud aviation advisories for the region of the Philippine Islands. Through application of its three-dimensional material transport and diffusion models using AFGWC meteorological analysis and forecast wind fields ARAC developed extensive analysis and 12-hourly forecast ash cloud position advisories extending to 48 hours for a period of five days. The advisories consisted of ``relative`` ash cloud concentrations in ten layers (surface-5,000 feet, 5,000--10,000 feet and every 10,000 feet to 90,000 feet). The ash was represented as a log-normal size distribution of 10--200 {mu}m diameter solid particles. Size-dependent ``ashfall`` was simulated over time as the eruption clouds dispersed. Except for an internal experimental attempt to model one of the Mount Redoubt, Alaska, eruptions (12/89), ARAC had no prior experience in modeling volcanic eruption ash hazards. For the cataclysmic eruption of 15--16 June, the complex three-dimensional atmospheric structure of the region produced dramatically divergent ash cloud patterns. The large eruptions (> 7--10 km) produced ash plume clouds with strong westward transport over the South China Sea, Southeast Asia, India and beyond. The low-level eruptions (< 7 km) and quasi-steady-state venting produced a plume which generally dispersed to the north and east throughout the support period. Modeling the sequence of eruptions presented a unique challenge. Although the initial approach proved viable, further refinement is necessary and possible. A distinct need exists to quantify eruptions consistently such that ``relative`` ash concentrations relate to specific aviation hazard categories.

Sullivan, T.J.; Ellis, J.S. [Lawrence Livermore National Lab., CA (United States); Schalk, W.W.; Nasstrom, J.S. [EG and G, Inc., Pleasanton, CA (United States)

1992-06-25T23:59:59.000Z

408

Internet ware cloud computing :Challenges  

E-Print Network (OSTI)

After decades of engineering development and infrastructural investment, Internet connections have become commodity product in many countries, and Internet scale "cloud computing" has started to compete with traditional software business through its technological advantages and economy of scale. Cloud computing is a promising enabling technology of Internet ware Cloud Computing is termed as the next big thing in the modern corporate world. Apart from the present day software and technologies, cloud computing will have a growing impact on enterprise IT and business activities in many large organizations. This paper provides an insight to cloud computing, its impacts and discusses various issues that business organizations face while implementing cloud computing. Further, it recommends various strategies that organizations need to adopt while migrating to cloud computing. The purpose of this paper is to develop an understanding of cloud computing in the modern world and its impact on organizations and businesse...

Qamar, S; Singh, Mrityunjay

2010-01-01T23:59:59.000Z

409

Supersaturation Intermittency in Turbulent Clouds  

Science Conference Proceedings (OSTI)

It is hypothesized that bursts of high supersaturation are produced in turbulent, convective clouds through interactions between cloud droplets and the small-scale structure of atmospheric turbulence. This hypothesis is based on the observation ...

Raymond A. Shaw

2000-10-01T23:59:59.000Z

410

Mechanisms of Banner Cloud Formation  

Science Conference Proceedings (OSTI)

Banner clouds are clouds in the lee of steep mountains or sharp ridges. Their formation has previously been hypothesized as due to three different mechanisms: (i) vertical uplift in a lee vortex (which has a horizontal axis), (ii) adiabatic ...

Matthias Voigt; Volkmar Wirth

2013-11-01T23:59:59.000Z

411

A Computer for the Clouds  

NLE Websites -- All DOE Office Websites (Extended Search)

Computer for the Clouds A Computer for the Clouds August 1, 2008 By PHILIP E. ROSS Columnist IEEE Spectrum: Inside Technology In May an IBM-built supercomputer called Roadrunner...

412

Remote Sensing of Cloud Parameters  

Science Conference Proceedings (OSTI)

Day and night mapping of the global distributions of the horizontal cloud covers and the corresponding cloud-top pressure levels are derived from the same set of infrared radiance data used to retrieve clear-column temperature profiles. General ...

Moustafa T. Chahine

1982-01-01T23:59:59.000Z

413

NIST Cloud Computing Related Publications  

Science Conference Proceedings (OSTI)

... Challenging Security Requirements for US Government Cloud Computing Adoption", December 2012 C. Dabrowski and K. Mills, "VM Leakage and ...

2013-07-31T23:59:59.000Z

414

Using doppler radar images to estimate aircraft navigational heading error  

SciTech Connect

A yaw angle error of a motion measurement system carried on an aircraft for navigation is estimated from Doppler radar images captured using the aircraft. At least two radar pulses aimed at respectively different physical locations in a targeted area are transmitted from a radar antenna carried on the aircraft. At least two Doppler radar images that respectively correspond to the at least two transmitted radar pulses are produced. These images are used to produce an estimate of the yaw angle error.

Doerry, Armin W. (Albuquerque, NM); Jordan, Jay D. (Albuquerque, NM); Kim, Theodore J. (Albuquerque, NM)

2012-07-03T23:59:59.000Z

415

Edward Luke | BNL  

NLE Websites -- All DOE Office Websites (Extended Search)

Edward Luke Edward Luke Advanced Applications Engineer Education Rensselaer Polytechnic Institute, B.S., Electrical Engineering Membership American Geophysical Union Areas of Interest Remote sensing of the atmosphere Cloud property retrieval algorithms Computational intelligence Pattern recognition Data fusion Radar meteorology Climate modeling Parallel/GPU computing Experience Developed a range of novel techniques for observing the microphysics and dynamics of clouds and precipitation using millimeter wavelength radars, particularly their Doppler spectra, with an emphasis on improving our detailed observational capabilities of cloud-precipitation mixtures and the formation of precipitation within cloud, including drizzling stratocumulus and Arctic mixed-phase clouds. Created algorithms for the classification of cloud types and

416

Parameterizing Vertically Coherent Cloud Distributions  

Science Conference Proceedings (OSTI)

A parameterization for specifying subgrid-scale cloud distributions in atmospheric models is developed. The fractional area of a grid-scale column in which clouds from two levels overlap (i.e., the cloud overlap probability) is described in terms ...

John W. Bergman; Philip J. Rasch

2002-07-01T23:59:59.000Z

417

Contract RBAC in cloud computing  

Science Conference Proceedings (OSTI)

Cloud computing is a fast growing field, which is arguably a new computing paradigm. In cloud computing, computing resources are provided as services over the Internet and users can access resources based on their payments. The issue of access control ... Keywords: Cloud computing, Contract, Contract RBAC, Datacenter, RBAC

Hsing-Chung (Jack) Chen, Marsha Anjanette Violetta, Cheng-Ying Yang

2013-11-01T23:59:59.000Z

418

Improving Utilization of Infrastructure Clouds  

Science Conference Proceedings (OSTI)

A key advantage of infrastructure-as-a-service (IaaS) clouds is providing users on-demand access to resources. To provide on-demand access, however, cloud providers must either significantly overprovision their infrastructure (and pay a high price for ... Keywords: Cloud Computing, Infrastructure-as-a-Service, High Throughput Computing

Paul Marshall; Kate Keahey; Tim Freeman

2011-05-01T23:59:59.000Z

419

DOE/SC-ARM-12-009 ARM Radar Organization JW Voyles  

NLE Websites -- All DOE Office Websites (Extended Search)

Bharadwaj Radar Calibration Plan, controlled document Nitin Bharadwaj Instrument Handbooks, controlled documents Kevin Widener Radar status and information: www.radar.arm.gov...

420

1  

NLE Websites -- All DOE Office Websites (Extended Search)

Rainfall Profiling Using ARM Millimeter Rainfall Profiling Using ARM Millimeter Wavelength Cloud Radars SY Matrosov and MD Shupe Cooperative Institute for Research in Environmental Sciences University of Colorado and National Oceanic and Atmospheric Administration Earth System Research Laboratory Boulder, Colorado PD May Bureau of Meteorology Research Centre Melbourne, Australia Introduction The Atmospheric Radiation Measurement (ARM) Program Data Archive contains detailed vertically resolved radar measurements representing echoes from clouds and precipitation. Since it earlier days, the ARM Program has invested heavily (both financially and intellectually) in the development of remote sensing methods to retrieve cloud microphysical parameters. No significant development for

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

A Smooth Cloud Model  

Science Conference Proceedings (OSTI)

In this paper a large-eddy “smooth” cloud (SC) model will be presented with smooth implying that the entire model converges under a Newton-based solution procedure or that time scales within the SC model are being resolved. Besides ensuring that ...

J. M. Reisner; C. A. Jeffery

2009-06-01T23:59:59.000Z

422

Virtual CSU-CHILL Radar: The VCHILL  

Science Conference Proceedings (OSTI)

The Virtual CHILL (VCHILL) system makes it possible to transfer the educational and research experience of the Colorado State University dual polarization radar to remote locations over the Internet. The VCHILL operation includes remote control ...

V. Chandrasekar; Yoong-Goog Cho; D. Brunkow; A. Jayasumana

2005-07-01T23:59:59.000Z

423

Mean Radar Echo Characteristics during Project GALE  

Science Conference Proceedings (OSTI)

The mean radar echo characteristics during the Genesis of Atlantic Lows Experiment (GALE) are presented for the southeastern United States during the 15 January–15 March 1986 field phase of the program. The echo characteristics were derived from ...

Thomas J. Trunk; Lance F. Bosart

1990-02-01T23:59:59.000Z

424

Multiple-Doppler Radar Network Design  

Science Conference Proceedings (OSTI)

Observing programs utilizing Doppler radar must have them deployed in optimum locations to best satisfy experimental objectives and maximize economies. One wishes to determine the coordinate triples (xi, yi, zi), where i equals the number of ...

Peter S. Ray; Karen L. Sangren

1983-08-01T23:59:59.000Z

425

On the Sensitivity of Weather Radars  

Science Conference Proceedings (OSTI)

This paper discusses the subject of weather radar system sensitivity from a general point of view, with emphasis an the influence of wavelength. Expressions for the echo signal-to-noise ratio are examined using a detection theory approach to ...

Paul L. Smith

1986-12-01T23:59:59.000Z

426

Radar Backscattering by Inhomogeneous Precipitation Particles  

Science Conference Proceedings (OSTI)

Calculations of radar backscattering by inhomogeneous precipitation particles require values of the dielectric function of two-component mixtures. Four such dielectric functions are critically examined and their relative merits are weighed. ...

Craig F. Bohren; Louis J. Battan

1980-08-01T23:59:59.000Z

427

Radar Observations of a Major Industrial Fire  

Science Conference Proceedings (OSTI)

On 23 May 1996, a Montreal suburban paint factory containing several hundred thousand gallons of paints, solvents, and other chemicals burned to the ground in a spectacular fire. The smoke plume from the fire was readily detected by three radars ...

R. R. Rogers; W. O. J. Brown

1997-05-01T23:59:59.000Z

428

Geostationary Doppler Radar and Tropical Cyclone Surveillance  

Science Conference Proceedings (OSTI)

The potential usefulness of spaceborne Doppler radar as a tropical cyclone observing tool is assessed by conducting a high-resolution simulation of an intense hurricane and generating synthetic observations of reflectivity and radial velocity. The ...

William E. Lewis; Eastwood Im; Simone Tanelli; Ziad Haddad; Gregory J. Tripoli; Eric A. Smith

2011-10-01T23:59:59.000Z

429

Optimization of Multiparameter Radar Estimates of Rainfall  

Science Conference Proceedings (OSTI)

The estimates of rainfall rate derived from a multiparameter radar based on reflectivity factor (RZH), differential reflectivity (RDR), and specific differential propagation phase (RDP) have widely varying accuracies over the dynamic range of the ...

V. Chandrasekar; Eugenio Gorgucci; Gianfranco Scarchilli

1993-07-01T23:59:59.000Z

430

Mapping of Airborne Doppler Radar Data  

Science Conference Proceedings (OSTI)

Two sets of equations are derived to 1) map airborne Doppler radar data from an aircraft-relative coordinate system to an earth-relative coordinate system, and 2) remove the platform motion from the observed Doppler velocities. These equations ...

Wen-Chau Lee; Peter Dodge; Frank D. Marks Jr.; Peter H. Hildebrand

1994-04-01T23:59:59.000Z

431

Radar System Errors in Polarization Diversity Measurements  

Science Conference Proceedings (OSTI)

The measurement capability of a polarization diversity radar is limited by several characteristics of the system and particularly by the performance of the antenna, which is characterized by the integrated cancellation ratio or integrated cross-...

James I. Metcalf; James S. Ussailis

1984-06-01T23:59:59.000Z

432

Ground Penetrating Imaging Radar Phase II  

Science Conference Proceedings (OSTI)

EPRI project "Ground Penetrating Imaging Radar Phase II," also called the "GPiR Project," started in August 1998 at Schlumberger-Doll Research, a division of Schlumberger Technology Corporation. Its goal was to determine if modern ground-penetrating radar (GPR) could make three-dimensional (3D) images of buried utility lines accurate and detailed enough to help utility companies better manage their underground infrastructure. Work began with a comparison of commercial and prototype GPR systems in the lab...

2001-06-20T23:59:59.000Z

433

Cumulus Cloud Properties Derived Using Landsat Satellite Data  

Science Conference Proceedings (OSTI)

Landsat Multispectral Scanner (MSS) digital data are used to remotely sense cumulus cloud properties such as cloud fraction and cloud reflectance, along with the distribution of cloud number and cloud fraction as a function of cloud size. The ...

Bruce A. Wielicki; Ronald M. Welch

1986-03-01T23:59:59.000Z

434

The convective structures associated with cloud-to-ground lightning in TOGA COARE Mesoscale Convective Systems  

E-Print Network (OSTI)

The TOGA COARE experiment was carried out in the western Pacific warm pool region from November 1992 through February 1993. Data from TOGA COARE provide the opportunity for comprehensive studies of tropical oceanic convection. This study seeks to understand more about the structures of tropical mesoscale convective systems in relation to their lightning activity and cold cloud area. The properties of convective cores within the MCSs, as well as their infrared (IR) cloud top temperatures are related to cloud-to-ground lightning. IR and lightning time histories for each case are compared, and the cases ranked by mean flashes per 10000 km2. For selected cases, radar/lightning overlays and vertical profiles of maximum radar reflectivities (VPRRs) are shown in order to describe the convective structures of cells that produced lightning, and also cells that did not produce lightning. IR cloud-top temperature and lightning histories indicate the highly variable nature of the TOGA COARE MCSs. Some MCSs which have very cold cloud-top temperatures have little or no lightning. When a system did produce lightning, more flashes generally occurred during its growth phase. Overall, IR measurements seem to be a poor indicator of lightning due to the lack of a clear relationship between the size of cold cloud-top area and cloud-to-ground flashes. The overall flash rates of the TOGA COARE MCSs support previous work which showed that tropical oceanic convection has an order of magnitude less cloud-to-ground lightning than continental convection. In fact, the highest flash rate for the 13 cases was less than the weakest continental case in a Texas MCS study (Toracinta et al. 1995). Examination of individual VPRR and of all convective VPRR from the 13 cases indicate a pronounced difference between lightning producing and non-lightning producing cells. Lightning producing convective cells have higher radar reflectivity in the 5.0- 8.0 km layer, and a slower decrease with height, both observations indicating larger ice particles in the mixed phase region between 00 C and-200 C.

Restivo, Michael Edward

1995-01-01T23:59:59.000Z

435

Assessment of Uncertainty in Cloud Radiative Effects and Heating Rates through Retrieval Algorithm Differences: Analysis using 3-years of ARM data at Darwin, Australia  

SciTech Connect

Ground-based radar and lidar observations obtained at the Department of Energy’s Atmospheric Radiation Measurement Program’s Tropical Western Pacific site located in Darwin, Australia are used to retrieve ice cloud properties in anvil and cirrus clouds. Cloud microphysical properties derived from four different retrieval algorithms (two radar-lidar and two radar only algorithms) are compared by examining mean profiles and probability density functions of effective radius (Re), ice water content (IWC), extinction, ice number concentration, ice crystal fall speed, and vertical air velocity. Retrieval algorithm uncertainty is quantified using radiative flux closure exercises. The effect of uncertainty in retrieved quantities on the cloud radiative effect and radiative heating rates are presented. Our analysis shows that IWC compares well among algorithms, but Re shows significant discrepancies, which is attributed primarily to assumptions of particle shape. Uncertainty in Re and IWC translates into sometimes-large differences in cloud radiative effect (CRE) though the majority of cases have a CRE difference of roughly 10 W m-2 on average. These differences, which we believe are primarily driven by the uncertainty in Re, can cause up to 2 K/day difference in the radiative heating rates between algorithms.

Comstock, Jennifer M.; Protat, Alain; McFarlane, Sally A.; Delanoe, Julien; Deng, Min

2013-05-22T23:59:59.000Z

436

Millimeter Wave Sensor Technologies Track Biometrics; Detect Chemicals, Gases, and Radiation  

Security threats come in many forms—airborne, radiative, gaseous, human, or infiltrative—and it can be costly and impractical to deploy a broad suite of detector technologies to identify all potential hazards in public places. Argonne’s millimeter ...

437

Near-Millimeter Wave Issues for a Space Power Grid Narayanan Komerath, Vigneshwar Venkat, Jason Fernandez  

E-Print Network (OSTI)

Near-Millimeter Wave Issues for a Space Power Grid Narayanan Komerath, Vigneshwar Venkat, Jason on Earth. This phase enables renewable power plants to be built at remote locations, and yet exploit these plants to smooth out their power output using input from plants as far away as the other side

438

Quantum-limited detection of millimeter waves using superconducting tunnel junctions  

SciTech Connect

The quasiparticle tunneling current in a superconductor-insulator- superconductor (SIS) tunnel junction is highly nonlinear. Such a nonlinearity can be used to mix two millimeter wave signals to produce a signal at a much lower intermediate frequency. We have constructed several millimeter and sub-millimeter wave SIS mixers in order to study high frequency response of the quasiparticle tunneling current and the physics of high frequency mixing. We have made the first measurement of the out-of-phase tunneling currents in an SIS tunnel junction. We have developed a method that allows us to determine the parameters of the high frequency embedding circuit by studying the details of the pumped I-V curve. We have constructed a 80--110 GHz waveguide-based mixer test apparatus that allows us to accurately measure the gain and added noise of the SIS mixer under test. Using extremely high quality tunnel junctions, we have measured an added mixer noise of 0.61 {plus_minus} 0.36 quanta, which is within 25 percent of the quantum limit imposed by the Heisenberg uncertainty principle. This measured performance is in excellent agreement with that predicted by Tucker`s theory of quantum mixing. We have also studied quasioptically coupled millimeter- and submillimeter-wave mixers using several types of integrated tuning elements. 83 refs.

Mears, C.A.

1991-09-01T23:59:59.000Z

439

Quantum-limited detection of millimeter waves using superconducting tunnel junctions  

SciTech Connect

The quasiparticle tunneling current in a superconductor-insulator- superconductor (SIS) tunnel junction is highly nonlinear. Such a nonlinearity can be used to mix two millimeter wave signals to produce a signal at a much lower intermediate frequency. We have constructed several millimeter and sub-millimeter wave SIS mixers in order to study high frequency response of the quasiparticle tunneling current and the physics of high frequency mixing. We have made the first measurement of the out-of-phase tunneling currents in an SIS tunnel junction. We have developed a method that allows us to determine the parameters of the high frequency embedding circuit by studying the details of the pumped I-V curve. We have constructed a 80--110 GHz waveguide-based mixer test apparatus that allows us to accurately measure the gain and added noise of the SIS mixer under test. Using extremely high quality tunnel junctions, we have measured an added mixer noise of 0.61 {plus minus} 0.36 quanta, which is within 25 percent of the quantum limit imposed by the Heisenberg uncertainty principle. This measured performance is in excellent agreement with that predicted by Tucker's theory of quantum mixing. We have also studied quasioptically coupled millimeter- and submillimeter-wave mixers using several types of integrated tuning elements. 83 refs.

Mears, C.A.

1991-09-01T23:59:59.000Z

440

Use of the CSU–CHILL Radar in Radar Meteorology Education at Colorado State University  

Science Conference Proceedings (OSTI)

A recent example illustrating the use of the CSU–CHILL Doppler radar in a graduate-level course in radar meteorology at Colorado State University (CSU) is described. In addition to providing students in the Department of Atmospheric Science with “...

Steven A. Rutledge; Patrick C. Kennedy; David A. Brunkow

1993-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Nonuniform Beamfilling Correction for Spaceborne Radar Rainfall Measurement: Implications from TOGA COARE Radar Data Analysis  

Science Conference Proceedings (OSTI)

A method is studied to make a nonuniform beamfilling (NUBF) correction for the path-integrated attenuation (PIA) derived from spaceborne radar measurement. The key of this method is to estimate rain-rate variability within a radar field of view ...

Toshiaki Kozu; Toshio Iguchi

1999-11-01T23:59:59.000Z

442

On the measurement of wind speeds in tornadoes with a portable CW/FM-CW Doppler radar  

Science Conference Proceedings (OSTI)

Both the formation mechanism and structure of tornadoes are not yet well understood. The Doppler radar is probably the best remote-sensing instrument at present for determining the wind field in tornadoes. Although much has been learned about the non-supercell tornado from relatively close range using Doppler radars at fixed sites, close-range measurements in supercell tornadoes are relatively few. Doppler radar can increase significantly the number of high-resolution, sub-cloud base measurements of both the tornado vortex and its parent vortex in supercells, with simultaneous visual documentation. The design details and operation of the CW/FM-CW Doppler radar developed at the Los Alamos National Laboratory and used by storm-intercept teams at the Univ. of Oklahoma are described elsewhere. The radar transmits 1 W at 3 cm, and can be switched back and forth between CW and FM-CW modes. In the FM-CW mode the sweep repetition frequency is 15.575 kHz and the sweep width 1.9 MHz; the corresponding maximum unambiguous range and velocity, and range resolution are 5 km, {plus minus} 115 m s{sup {minus}1}, and 78 m respectively. The bistatic antennas, which have half-power beamwidths of 5{degree}, are easily pointed wit the aid of a boresighted VCR. FM-CW Data are recorded on the VCR, while voice documentation is recorded on the audio tape; video is recorded on another VCR. The radar and antennas are easily mounted on a tripod, and can be set up by three people in a minute or two. The purpose of this paper is to describe the signal processing techniques used to determine the Doppler spectrum in the FM-CW mode and a method of its interpretation in real time, and to present data gathered in a tornadic storm in 1990. 15 refs., 7 figs.

Bluestein, H.B. (Oklahoma Univ., Norman, OK (USA). School of Meteorology); Unruh, W.P. (Los Alamos National Lab., NM (USA))

1991-01-01T23:59:59.000Z

443

Strengths and Limitations of Current Radar Systems for Two Stakeholder Groups in the Southern Plains  

Science Conference Proceedings (OSTI)

Advancements in radar technology since the deployment of the Weather Surveillance Radar-1988 Doppler (WSR-88D) network have prompted consideration of radar replacement technologies. In order for the outcomes of advanced radar research and ...

Daphne S. LaDue; Pamela L. Heinselman; Jennifer F. Newman

2010-07-01T23:59:59.000Z

444

A Comparison of Tornado Warning Lead Times with and without NEXRAD Doppler Radar  

Science Conference Proceedings (OSTI)

The installation of the network of NEXRAD (Next Generation Weather Radar) WSR-88D (Weather Surveillance Radar—1988 Doppler) radars has been an ongoing process for more than three years. An assessment is made on how these radars and related ...

Paul Bieringer; Peter S. Ray

1996-03-01T23:59:59.000Z

445

Spurious Velocities in Doppler Radar Data Caused by a Moving Antenna Feedhorn  

Science Conference Proceedings (OSTI)

Modern Doppler weather radars use clutter filtering to reduce the strength of ground targets and enhance the detection of meteorological echoes. WSR-88D [NEXRAD (Next Generation Radar) and TDWR (Terminal Doppler Weather Radar)] radars, for ...

Ronald E. Rinehart

1991-12-01T23:59:59.000Z

446

Hupmobile cloud chamber parameters  

SciTech Connect

The accompanying table lists the presently selected parameters for the twelve cloud chambers. The chambers are numbered consecutively from 4 through 15 as they are lined up in the bunker. The lowest number is closest to the source. All except the first chamber have some thin metal filters to attenuate the flux and harden the spectrum. Cloud chambers 10, 12, and 14 are shielded by a collimator with about 200 pinholes in it. The flux in these chambers is attenuated by the ratio of the pinhole area to total beam area which is a factor of 50. Various gases and gas pressures are used to obtain suitable track lengths and interaction cross sections. Neon, argon, and krypton are used to obtain photo electrons. Hydrogen is used to obtain Compton electrons.

Hansen, N. E.

1967-09-28T23:59:59.000Z

447

Statistical cloud coverage as a function of cloud optical thickness  

Science Conference Proceedings (OSTI)

The time-averaged, daylight fractional statistical cloud coverages as a function of cloud optical thickness and selected values of cloud transmission were determined for various geographic areas using D1 data from the International Satellite Cloud Climatology Project (ISCCP). The regions of interest chosen for this report are: global earth, global sea, global land, global coast, and the six 30{degree}-latitude bands over sea, over land, and over coast with longitude 0{degree}--360{degree}. This statistical information is deduced from data determined from satellite measurements of terrestrial, atmospheric and cloud properties by the International Satellite Cloud Climatology Project. In particular the results are based on the ISCCP D1 data base.

Brower, K.L.

1998-07-01T23:59:59.000Z

448

Controlled synthesis of millimeter-long silicon nanowires with uniform electronic properties  

E-Print Network (OSTI)

We report the nanocluster-catalyzed growth of ultralong and highly uniform single-crystalline silicon nanowires (SiNWs) with millimeter-scale lengths and aspect ratios up to approximately 100 000. The average SiNW growth rate using disilane (Si2H6) at400°C was31µm/min, while the growth rate determined for silane (SiH4) reactant under similar growth conditions was 130 times lower. Transmission electron microscopy studies of millimeter-long SiNWs with diameters of 20-80 nm show that the nanowires grow preferentially along the ?110 ? direction independent of diameter. In addition, ultralong SiNWs were used as building blocks to fabricate one-dimensional arrays of field-effect transistors (FETs) consisting of approximately 100 independent devices per nanowire. Significantly, electrical transport measurements demonstrated that the millimeter-long SiNWs had uniform electrical properties along the entire length of wires, and each device can behave as a reliable FET with an on-state current, threshold voltage, and transconductance values (average (1 standard deviation) of 1.8 ( 0.3 µA, 6.0 ( 1.1 V, 210 ( 60 nS, respectively. Electronically uniform millimeter-long SiNWs were also functionalized with monoclonal antibody receptors and used to demonstrate multiplexed detection of cancer marker proteins with a single nanowire. The synthesis of structurally and electronically uniform ultralong SiNWs may open up new opportunities for integrated nanoelectronics and could serve as unique building blocks linking integrated structures from the nanometer through millimeter length scales. Semiconducting nanowires (NWs) 1-5 are attractive building blocks for fabricating functional nanodevices with single

Won Il Park; Gengfeng Zheng; Xiaocheng Jiang; Bozhi Tian; Charles M. Lieber

2008-01-01T23:59:59.000Z

449

A Cloud-Resolving Model with an Adaptive Vertical Grid for Boundary Layer Clouds  

Science Conference Proceedings (OSTI)

Accurate cloud-resolving model simulations of cloud cover and cloud water content for boundary layer clouds are difficult to achieve without vertical grid spacing well below 100 m, especially for inversion-topped stratocumulus. The need for fine ...

Roger Marchand; Thomas Ackerman

2011-05-01T23:59:59.000Z

450

An Automated Cirrus Cloud Detection Method for a Ground-Based Cloud Image  

Science Conference Proceedings (OSTI)

Cloud detection is a basic research for achieving cloud-cover state and other cloud characteristics. Because of the influence of sunlight, the brightness of sky background on the ground-based cloud image is usually nonuniform, which increases the ...

Jun Yang; Weitao Lu; Ying Ma; Wen Yao

2012-04-01T23:59:59.000Z

451

Preliminary definition of Barstow standard cloud model  

DOE Green Energy (OSTI)

The motion of cloud shadows across a collector field for a central receiver solar power plant can affect the design of such a facility. Cloud models were developed to be used for basis of design in technology areas. The first effect, that of the temperature gradient, is simulated by postulating the worst case cloud situation. The cyclic effects require realistic cloud shadow time histories for simulation. Cloud shadow models were developed to determine probable cloud type, the cloud area and shape, cloud velocity and cloud-to-cloud spacing. The probability of cloud occurrence is estimated. A collector field computer program is run to determine the effect of cloud variables on collector field power delivery capability. Recommendation of cloud models to be used for basis of design are then made.

None

1978-04-05T23:59:59.000Z

452

Radiation Parameterization for Three-Dimensional Inhomogeneous Cirrus Clouds Applied to ARM Data and Climate Models  

DOE Green Energy (OSTI)

OAK-B135 (a) We developed a 3D radiative transfer model to simulate the transfer of solar and thermal infrared radiation in inhomogeneous cirrus clouds. The model utilized a diffusion approximation approach (four-term expansion in the intensity) employing Cartesian coordinates. The required single-scattering parameters, including the extinction coefficient, single-scattering albedo, and asymmetry factor, for input to the model, were parameterized in terms of the ice water content and mean effective ice crystal size. The incorporation of gaseous absorption in multiple scattering atmospheres was accomplished by means of the correlated k-distribution approach. In addition, the strong forward diffraction nature in the phase function was accounted for in each predivided spatial grid based on a delta-function adjustment. The radiation parameterization developed herein is applied to potential cloud configurations generated from GCMs to investigate broken clouds and cloud-overlapping effects on the domain-averaged heating rate. Cloud inhomogeneity plays an important role in the determination of flux and heating rate distributions. Clouds with maximum overlap tend to produce less heating than those with random overlap. Broken clouds show more solar heating as well as more IR cooling as compared to a continuous cloud field (Gu and Liou, 2001). (b) We incorporated a contemporary radiation parameterization scheme in the UCLA atmospheric GCM in collaboration with the UCLA GCM group. In conjunction with the cloud/radiation process studies, we developed a physically-based cloud cover formation scheme in association with radiation calculations. The model clouds were first vertically grouped in terms of low, middle, and high types. Maximum overlap was then used for each cloud type, followed by random overlap among the three cloud types. Fu and Liou's 1D radiation code with modification was subsequently employed for pixel-by-pixel radiation calculations in the UCLA GCM. We showed that the simulated cloud cover and OLR fields without special tuning are comparable to those of ISCCP dataset and the results derived from radiation budget experiments. Use of the new radiation and cloud schemes enhances the radiative warming in the middle to upper tropical troposphere and alleviates the cold bias in the UCLA atmospheric GCM. We also illustrated that ice crystal size and cloud inhomogeneous are significant factors affecting the radiation budgets at the top of the atmosphere and the surface (Gu et al. 2003). (c) An innovative approach has been developed to construct a 3D field of inhomogeneous clouds in general and cirrus in particular in terms of liquid/ice water content and particle size on the basis of a unification of satellite and ground-based cloud radar data. Satellite remote sensing employing the current narrow-band spectro-radiometers has limitation and only the vertically integrated cloud parameters (optical depth and mean particle size) can be determined. However, by combining the horizontal cloud mapping inferred from satellites with the vertical structure derived from the profiling Doppler cloud radar, a 3D cloud field can be constructed. This represents a new conceptual approach to 3D remote sensing and imaging and offers a new perspective in observing the cloud structure. We applied this novel technique to AVHRR/NOAA satellite and mm-wave cloud radar data obtained from the ARM achieve and assessed the 3D cirrus cloud field with the ice crystal size distributions independently derived from optical probe measurements aboard the University of North Dakota Citation. The retrieved 3D ice water content and mean effective ice crystal size involving an impressive cirrus cloud occurring on April 18, 1997, are shown to be comparable to those derived from the analysis of collocated and coincident in situ aircraft measurements (Liou et al. 2002). (d) Detection of thin cirrus with optical depths less than 0.5, particularly those occurring i n the tropics remains a fundamental problem in remote sensing. We developed a new detection scheme for the

Kuo-Nan Liou

2003-12-29T23:59:59.000Z

453

CloudCast: Cloud Computing for Short-Term Weather Forecasts  

Science Conference Proceedings (OSTI)

CloudCast provides clients with personalized short-term weather forecasts based on their current location using cloud services

Dilip Kumar Krishnappa; David Irwin; Eric Lyons; Michael Zink

2013-01-01T23:59:59.000Z

454

Cloud Boundary Statistics during FIRE II  

Science Conference Proceedings (OSTI)

An 8-mm wavelength radar, 3-mm wavelength radar, and 10.6-µm wavelength lidar operated side by side in vertically pointing mode during the First ISCCP Regional Experiment (FIRE II). This data collection mode yielded detailed information on ...

Taneil Uttal; Janet M. Intrieri; Wynn L. Eberhard; Eugene E. Clothiaux; Thomas P. Ackerman

1995-12-01T23:59:59.000Z

455

Size of Cloud from Shadow  

NLE Websites -- All DOE Office Websites (Extended Search)

Size of Cloud from Shadow Size of Cloud from Shadow Name: mike Status: other Grade: other Location: N/A Country: USA Date: Summer 2011 Question: I see a cloud and I see its shadow in a field - knowing high sun angles - is there a way of telling how far away the cloud is or how big? - I am thinking if the shadow is 30' wide and the sun is at 2:00 pm- ? Replies: Hi Mike, Try this, draw a small circle representing the Sun. Somewhere below this circle and maybe to the right, draw an oblong, make this oblong bigger than the circle. Now connect the leftmost edge of the circle with the leftmost edge of the oblong with a straight line. Do the same for the rightmost edges. The oblong now represent the shadow of a cloud on the ground, and the lines represent the rays of the sun passing along the edges of the cloud.

456

ARM - Measurement - Cloud droplet size  

NLE Websites -- All DOE Office Websites (Extended Search)

droplet size droplet size ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Cloud droplet size Linear size (e.g. radius or diameter) of a cloud particle Categories Cloud Properties Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. Field Campaign Instruments CPI : Cloud Particle Imager CVI-AIR : Counterflow Virtual Impactor MIRAI : JAMSTEC Research Vessel Mirai PDI : Phase Doppler Interferometer UAV-PROTEUS-MICRO : Proteus Cloud Microphysics Instruments SPEC-CPI : Stratton Park Engineering Company - Cloud particle imager

457

Cumulus Clouds and Reflected Sunlight  

NLE Websites -- All DOE Office Websites (Extended Search)

Cumulus Clouds and Reflected Sunlight Cumulus Clouds and Reflected Sunlight from Landsat ETM+ G. Wen and L. Oreopoulos National Aeronautics and Space Administration Goddard Space Flight Center University of Maryland Baltimore County Joint Center of Earth System Technology Greenbelt, Maryland R. F. Cahalan and S. C. Tsay National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt, Maryland Introduction Cumulus clouds attenuate solar radiation casting shows on the ground. Cumulus clouds can also enhance solar radiation in the clear region nearby. The enhancement of down-welling solar radiation has been observed at the ground level in the clear region near cumulus clouds (Mims and Frederick 1994). The additional diffuse radiation source from cumulus clouds makes the clear gaps appear to be

458

ARM - Measurement - Total cloud water  

NLE Websites -- All DOE Office Websites (Extended Search)

cloud water cloud water ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Total cloud water The total concentration (mass/vol) of ice and liquid water particles in a cloud; this includes condensed water content (CWC). Categories Cloud Properties Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. External Instruments NCEPGFS : National Centers for Environment Prediction Global Forecast System Field Campaign Instruments CSI : Cloud Spectrometer and Impactor PDI : Phase Doppler Interferometer

459

The Bolocam Galactic Plane Survey -- III. Characterizing Physical Properties of Massive Star-Forming Regions in the Gemini OB1 Molecular Cloud  

E-Print Network (OSTI)

We present the 1.1 millimeter Bolocam Galactic Plane Survey (BGPS) observations of the Gemini OB1 molecular cloud complex, and targeted ammonia observations of the BGPS sources. When paired with molecular spectroscopy of a dense gas tracer, millimeter observations yield physical properties such as masses, radii, mean densities, kinetic temperatures and line widths. We detect 34 distinct BGPS sources above 5-sigma=0.37 Jy/beam with corresponding 5-sigma detections in the ammonia (1,1) transition. Eight of the objects show water maser emission (20%). We find a mean millimeter source FWHM of 1.12 pc, and a mean kinetic temperature of 20 K for the sample of 34 BGPS sources. The observed ammonia line widths are dominated by non-thermal motions, typically found to be a few times the thermal sound speed expected for the derived kinetic temperature. We calculate the mass for each source from the millimeter flux assuming the sources are isothermal and find a mean isothermal mass within a 120" aperture of 230 +/- 180 s...

Dunham, Miranda K; Evans, Neal J; Cyganowski, Claudia J; Aguirre, James; Bally, John; Battersby, Cara; Bradley, Eric Todd; Dowell, Darren; Drosback, Meredith; Ginsburg, Adam; Glenn, Jason; Harvey, Paul; Merello, Manuel; Schlingman, Wayne; Shirley, Yancy L; Stringfellow, Guy S; Walawender, Josh; Williams, Jonathan P

2010-01-01T23:59:59.000Z

460

Broken and inhomogeneous cloud impact on satellite cloud particle effective radius and cloudphase retrievals  

E-Print Network (OSTI)

on the particle size distribution, height, and thermo- dynamic phase of clouds. Water and ice clouds have parameterizations is the global dis- tribution of cloud thermodynamic phase, i.e., whether a cloud is composed on satellitederived cloud particle effective radius (re) and cloud phase (CPH) for broken and overcast inhomogeneous

Stoffelen, Ad

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

An Integrated Display and Analysis Methodology for Multivariable Radar Data  

Science Conference Proceedings (OSTI)

Polarimetric Doppler radars provide valuable information about the kinematic and microphysical structure of storms. However, in-depth analysis using radar products, such as Doppler-derived wind vectors and hydrometeor identification, has been ...

Brenda A. Dolan; Steven A. Rutledge

2007-08-01T23:59:59.000Z

462

An 11-cm Coherent Polarimetric Radar for Meteorological Research  

Science Conference Proceedings (OSTI)

The Geophysics Directorate of the U.S. Air Force developed a unique 11-cm (S-band) coherent polarimetric radar. The radar can transmit signals of alternating orthogonal polarizations, with either circular or linear basis, and receive signals of ...

James I. Metcalf; Alexander W. Bishop; Richard C. Chanley; Timothy C. Hiett; Pio J. Petrocchi

1993-06-01T23:59:59.000Z

463

Inversion of Marine Radar Images for Surface Wave Analysis  

Science Conference Proceedings (OSTI)

A method to estimate sea surface elevation maps from marine radar image sequences is presented. This method is the extension of an existing inverse modeling technique to derive wave spectra from marine radar images, which assumes linear wave ...

JoséC. Nieto Borge; Germán RodrÍguez RodrÍguez; Katrin Hessner; Paloma Izquierdo González

2004-08-01T23:59:59.000Z

464

Dual-Polarization Radar Characteristics of an Apartment Fire  

Science Conference Proceedings (OSTI)

Dual-polarimetric microwave wavelength radar observations of an apartment fire in Huntsville, Alabama, on 3 March 2008 are examined to determine the radar-observable properties of ash and fire debris lofted into the atmosphere. Dual-polarimetric ...

Thomas A. Jones; Sundar A. Christopher; Walt Petersen

2009-10-01T23:59:59.000Z

465

Retrieval of Reflectivity in a Networked Radar Environment  

Science Conference Proceedings (OSTI)

A system for reflectivity and attenuation retrieval for rain medium in a networked radar environment is described. Electromagnetic waves backscattered from a common volume in networked radar systems are attenuated differently along the different ...

V. Chandrasekar; S. Lim

2008-10-01T23:59:59.000Z

466

On the Use of Radars for Operational Wind Profiling  

Science Conference Proceedings (OSTI)

The application of clear-air radars to operational wind profiling is considered. Several alternative techniques for determining atmospheric winds from radars are surveyed and, in light of the current interest in operational applications, the ...

B. B. Balsley; K. S. Gage

1982-09-01T23:59:59.000Z

467

Factors Affecting the Accuracy of SHOWEX HF Radar Wave Measurements  

Science Conference Proceedings (OSTI)

Ocean Surface Current Radar (OSCR) HF radar measurements of ocean waves and currents were made during the Shoaling Waves Experiment (SHOWEX) in the fall of 1999. During some periods, at some locations, good quality wave measurements were ...

Lucy R. Wyatt; Guennadi Liakhovetski; Hans C. Graber; Brian K. Haus

2005-07-01T23:59:59.000Z

468

A Dual-Wavelength Radar Method to Measure Snowfall Rate  

Science Conference Proceedings (OSTI)

A dual-wavelength radar method to estimate snowfall rate has been developed. The method suggests taking simultaneous and collocated reflectivity measurements at two radar wavelengths. Snowfall backscattering at one of these wavelengths should be ...

Sergey Y. Matrosov

1998-11-01T23:59:59.000Z

469

International Weather-Radar Networking in Western Europe  

Science Conference Proceedings (OSTI)

During the last few years there has been considerable activity in Western Europe aimed at establishing national radar networks. Concurrent with this work, several bilateral agreements to exchange weather-radar data across national boundaries have ...

C. G. Collier; C. A. Fair; D. H. Newsome

1988-01-01T23:59:59.000Z

470

A Radar Study of the Plasma and Geometry of Lightning  

Science Conference Proceedings (OSTI)

Radar measurements and model studies are combined to investigate the plasma condition and the physical structure of lightning in thunderclouds. The lightning radar target is inferred to be an arclike plasma whose temperature exceeds 5000 K, ...

Earle R. Williams; Spiros G. Geotis; A. B. Bhattacharya

1989-05-01T23:59:59.000Z

471

Heating Profiles Derived From Cm-wavelength Radar During TWP...  

NLE Websites -- All DOE Office Websites (Extended Search)

Heating Profiles Derived From Cm-wavelength Radar During TWP-ICE Heating Profiles Derived From Cm-wavelength Radar During TWP-ICE Courtney Schumacher and Kaycee Frederick Courtney...

472

Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach  

Science Conference Proceedings (OSTI)

From the Publisher:Spotlight-mode Synthetic Aperture Radar: A Signal Processing Approach describes an important mode of synthetic aperture radar (SAR) imaging, known as spotlight-mode SAR. By treating the subject via the principles of signal processing, ...

Paul Thompson; Daniel E. Wahl; Paul H. Eichel; Dennis C. Ghiglia; Charles V. Jakowatz

1996-01-01T23:59:59.000Z

473

Auxiliary Signal Processing System for a Multiparameter Radar  

Science Conference Proceedings (OSTI)

The design of an auxiliary signal processor for a multiparameter radar is described with emphasis on low cost, quick development, and minimum disruption of radar operations. The processor is based around a low-cost digital signal processor card ...

V. Chandrasekar; G. R. Gray; I. J. Caylor

1993-06-01T23:59:59.000Z

474

RADIAL-BASED NOISE POWER ESTIMATION FOR WEATHER RADARS  

Science Conference Proceedings (OSTI)

A radar antenna intercepts thermal radiation from various sources including the ground, the sun, the sky, precipitation and man-made radiators. In the radar receiver, this external radiation produces noise that constructively adds to the receiver ...

Igor R. Ivi?; Christopher Curtis; Sebastián M. Torres

475

Procedures to Improve the Accuracy of Airborne Doppler Radar Data  

Science Conference Proceedings (OSTI)

The navigation correction method proposed in Testud et al. (referred to as the THL method) systematically identifies uncertainties in the aircraft Inertial Navigation System and errors in the radar-pointing angles by analyzing the radar returns ...

Brian L. Bosart; Wen-Chau Lee; Roger M. Wakimoto

2002-03-01T23:59:59.000Z

476

Estimating Urban Canopy Parameters Using Synthetic Aperture Radar Data  

Science Conference Proceedings (OSTI)

This paper introduces a remote sensing–based approach to rapidly derive urban morphological characteristics using radar satellite data. The approach is based on the expectation that the magnitude of the synthetic aperture radar (SAR) backscatter ...

Indumathi Jeyachandran; Steven J. Burian; Stephen W. Stetson

2010-04-01T23:59:59.000Z

477

Tracking system for photon-counting laser radar  

E-Print Network (OSTI)

The purpose of this thesis is to build the tracking system for a photon-counting laser radar specifically a laser radar that has the ability to perform direct and coherent detection measurement at low signal levels with ...

Chang, Joshua TsuKang

2007-01-01T23:59:59.000Z

478

VHF and UHF Doppler Radars as Tools for Synoptic Research  

Science Conference Proceedings (OSTI)

Applications of VHF and UHF Doppler radars to research in synoptic meteorology are reviewed. We find that these radars show great potential for studies of large scales, but the area of research where the instruments really excel is in studying ...

M. F. Larsen; J. Röttger

1982-09-01T23:59:59.000Z

479

Mean Vertical Motions Seen by Radar Wind Profilers  

Science Conference Proceedings (OSTI)

Radar wind profilers have been used to measure directly the vertical motion above the radar site. Mean values of vertical motions in the troposphere and lower stratosphere reported at sites in and near mountains are often several centimeters per ...

G. D. Nastrom; T. E. VanZandt

1994-08-01T23:59:59.000Z

480

A Statistical Approach to Ground Radar-Rainfall Estimation  

Science Conference Proceedings (OSTI)

This paper presents development of a statistical procedure for estimation of ensemble rainfall fields from a combination of ground radar observations and in situ rain gauge measurements. The uncertainty framework characterizes radar-rainfall ...

Alemu Tadesse; Emmanouil N. Anagnostou

2005-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "millimeter cloud radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Estimation of Atmospheric Duct Structure Using Radar Sea Clutter  

Science Conference Proceedings (OSTI)

Retrieving atmospheric refractivity profiles from the sea surface backscattered radar clutter is known as the refractivity-from-clutter (RFC) technique. Because the relationship between refractivity and radar sea clutter is clearly nonlinear and ...

Zhao Xiaofeng; Huang Sixun

2012-09-01T23:59:59.000Z

482

The New French Operational Radar Rainfall Product. Part II: Validation  

Science Conference Proceedings (OSTI)

A new operational radar-based rainfall product has been developed at Météo-France and is currently being deployed within the French operational network. The new quantitative precipitation estimation (QPE) product is based entirely on radar data ...

P. Tabary; J. Desplats; K. Do Khac; F. Eideliman; C. Gueguen; J-C. Heinrich

2007-06-01T23:59:59.000Z

483

Operational Monitoring of Radar Differential Reflectivity Using the Sun  

Science Conference Proceedings (OSTI)

A method for the daily monitoring of the differential reflectivity bias for polarimetric weather radars is presented. Sun signals detected in polar volume data produced during operational scanning of the radar are used. This method is an ...

Iwan Holleman; Asko Huuskonen; Rashpal Gill; Pierre Tabary

2010-05-01T23:59:59.000Z

484

The Rain Profiling Algorithm Applied to Polarimetric Weather Radar  

Science Conference Proceedings (OSTI)

The algorithm developed in this paper for ground-based polarimetric radars is derived from those used for the spaceborne rain radar of TRMM (Tropical Rainfall Measurement Mission)—the so-called rain profiling algorithms. The characteristic of ...

Jacques Testud; Erwan Le Bouar; Estelle Obligis; Mustapha Ali-Mehenni

2000-03-01T23:59:59.000Z

485

Beam Multiplexing Using the Phased-Array Weather Radar  

Science Conference Proceedings (OSTI)

The recently installed S-band phased-array radar (PAR) at the National Weather Radar Testbed (NWRT) offers fast and flexible beam steering through electronic beam forming. This capability allows the implementation of a novel scanning strategy ...

Tian-You Yu; Marko B. Orescanin; Christopher D. Curtis; Dusan S. Zrni?; Douglas E. Forsyth

2007-04-01T23:59:59.000Z

486

Dual-wavelength polarimetric radar analyses of tornadic debris signatures  

Science Conference Proceedings (OSTI)

Statistical properties of tornado debris signatures (TDSs) are investigated using S- and C-band polarimetric radar data with comparisons to damage surveys and satellite imagery. Close proximity of the radars to the 10 May 2010 Moore-Oklahoma City ...

David J. Bodine; Robert D. Palmer; Guifu Zhang

487

Weather Radar Polarimetry-Trends Toward Operational Applications  

Science Conference Proceedings (OSTI)

This is a version of a speech presented at the 27th Conference on Radar Meteorology. Relative advantages of polarimetry are contrasted with the advantages accrued by the introduction of radar into meteorology and by the addition of Doppler ...

Dušan S. Zrni?

1996-07-01T23:59:59.000Z

488

Coastal Oceanography Applications of Digital Image Data from Marine Radar  

Science Conference Proceedings (OSTI)

A marine radar attached to a digital image capture system has been adapted for deployment from shore sites. Optimum operating parameters have been identified in relation to the resolution and sampling capabilities of both the radar and the ...

I. S. Robinson; N. P. Ward; C. P. Gommenginger; M. A. Tenorio-Gonzales

2000-05-01T23:59:59.000Z

489

Gust Front Characteristics as Detected by Doppler Radar  

Science Conference Proceedings (OSTI)

Gust fronts produce low altitude wind shear that can be hazardous to aircraft operations, especially during takeoff and landing. Radar meteorologists have long been able to identify gust front signatures in Doppler radar data, but in order to use ...

Diana L. Klingle; David R. Smith; Marilyn M. Wolfson

1987-05-01T23:59:59.000Z

490

Comparison of Dual-Polarization Radar Estimators of Rain  

Science Conference Proceedings (OSTI)

Several polarimetric radar estimators of rain rate R and rainwater content M are examined. The accuracy of the estimators is analyzed using a gamma drop size distribution (DSD) simulation and a radar wavelength of 11 cm. The estimators that use ...

A. V. Ryzhkov; D. S. Zrni?

1995-04-01T23:59:59.000Z

491

Radar Observations of the 3 May 1999 Oklahoma City Tornado  

Science Conference Proceedings (OSTI)

The 3 May 1999 Oklahoma City storm is unique from a weather radar perspective because a long-track violent tornado passed within close range of several Doppler radars, because a detailed damage survey was conducted immediately after the event, ...

Donald W. Burgess; Michael A. Magsig; Joshua Wurman; David C. Dowell; Yvette Richardson

2002-06-01T23:59:59.000Z

492

Service Availability in Cloud Computing.  

E-Print Network (OSTI)

?? Cloud computing provides access to on-demand computing resources and storage space, whereby applications and data are hosted with data centers managed by third parties,… (more)

Adegoke, Adekunle

2013-01-01T23:59:59.000Z

493

TC_CLOUD_REGIME.cdr  

NLE Websites -- All DOE Office Websites (Extended Search)

Tropical cloud properties as a function of regime Regimes? Monsoon versus Break * Different synoptic vertical velocity profiles - Changes convective inhibition, corresponding...

494

China Total Cloud Amount Trends  

NLE Websites -- All DOE Office Websites (Extended Search)

Trends in Total Cloud Amount Over China DOI: 10.3334CDIACcli.008 data Data image Graphics Investigator Dale P. Kaiser Carbon Dioxide Information Analysis Center, Environmental...

495

Indirect and Semi-Direct Aerosol Campaign: The Impact of Arctic Aerosols on Clouds  

SciTech Connect

A comprehensive dataset of microphysical and radiative properties of aerosols and clouds in the arctic boundary layer in the vicinity of Barrow, Alaska was collected in April 2008 during the Indirect and Semi-Direct Aerosol Campaign (ISDAC) sponsored by the Department of Energy Atmospheric Radiation Measurement (ARM) and Atmospheric Science Programs. The primary aim of ISDAC was to examine indirect effects of aerosols on clouds that contain both liquid and ice water. The experiment utilized the ARM permanent observational facilities at the North Slope of Alaska (NSA) in Barrow. These include a cloud radar, a polarized micropulse lidar, and an atmospheric emitted radiance interferometer as well as instruments specially deployed for ISDAC measuring aerosol, ice fog, precipitation and spectral shortwave radiation. The National Research Council of Canada Convair-580 flew 27 sorties during ISDAC, collecting data using an unprecedented 42 cloud and aerosol instruments for more than 100 hours on 12 different days. Data were obtained above, below and within single-layer stratus on 8 April and 26 April 2008. These data enable a process-oriented understanding of how aerosols affect the microphysical and radiative properties of arctic clouds influenced by different surface conditions. Observations acquired on a heavily polluted day, 19 April 2008, are enhancing this understanding. Data acquired in cirrus on transit flights between Fairbanks and Barrow are improving our understanding of the performance of cloud probes in ice. Ultimately the ISDAC data will be used to improve the representation of cloud and aerosol processes in models covering a variety of spatial and temporal scales, and to determine the extent to which long-term surface-based measurements can provide retrievals of aerosols, clouds, precipitation and radiative heating in the Arctic.

McFarquhar, Greg; Ghan, Steven J.; Verlinde, J.; Korolev, Alexei; Strapp, J. Walter; Schmid, Beat; Tomlinson, Jason M.; Wolde, Mengistu; Brooks, Sarah D.; Cziczo, Daniel J.; Dubey, Manvendra K.; Fan, Jiwen; Flynn, Connor J.; Gultepe, Ismail; Hubbe, John M.; Gilles, Mary K.; Laskin, Alexander; Lawson, Paul; Leaitch, W. R.; Liu, Peter S.; Liu, Xiaohong; Lubin, Dan; Mazzoleni, Claudio; Macdonald, A. M.; Moffet, Ryan C.; Morrison, H.; Ovchinnikov, Mikhail; Shupe, Matthew D.; Turner, David D.; Xie, Shaocheng; Zelenyuk, Alla; Bae, Kenny; Freer, Matthew; Glen, Andrew

2011-02-01T23:59:59.000Z

496

A Survey on Cloud Provider Security  

E-Print Network (OSTI)

A Survey on Cloud Provider Security Measures Alex Pucher, Stratos Dimopoulos Abstract Cloud take advantage of this model already, but security and privacy concerns limit the further adoption agencies and start offering security certifications and separate tightly controlled "government" cloud

497

Radiative Effects of Cloud-Type Variations  

Science Conference Proceedings (OSTI)

Radiative flux changes induced by the occurrence of different cloud types are investigated using International Satellite Cloud Climatology Project cloud data and a refined radiative transfer model from National Aeronautics and Space ...

Ting Chen; William B. Rossow; Yuanchong Zhang

2000-01-01T23:59:59.000Z

498

Statistical Description of Radiation Transfer in Clouds  

Science Conference Proceedings (OSTI)

The statistical characteristics of simulated cloud fields constructed based on Poisson point fluxes are studied. The input parameters of mathematical models of cloudiness include the cloud fraction and the mean horizontal size of clouds ...

Georgi A. Titov

1990-01-01T23:59:59.000Z

499

CALIPSO/CALIOP Cloud Phase Discrimination Algorithm  

Science Conference Proceedings (OSTI)

The current cloud thermodynamic phase discrimination by Cloud-Aerosol Lidar Pathfinder Satellite Observations (CALIPSO) is based on the depolarization of backscattered light measured by its lidar [Cloud-Aerosol Lidar with Orthogonal Polarization (...

Yongxiang Hu; David Winker; Mark Vaughan; Bing Lin; Ali Omar; Charles Trepte; David Flittner; Ping Yang; Shaima L. Nasiri; Bryan Baum; Robert Holz; Wenbo Sun; Zhaoyan Liu; Zhien Wang; Stuart Young; Knut Stamnes; Jianping Huang; Ralph Kuehn

2009-11-01T23:59:59.000Z

500

Cloud Microphysical Relationships in California Marine Stratus  

Science Conference Proceedings (OSTI)

Cloud microphysical measurements off the southern California coast are presented and compared with in situ airborne measurements of cloud condensation nuclei (CCN) spectra. Large-scale variations in cloud droplet concentrations were due to CCN ...

James G. Hudson; Gunilla Svensson

1995-12-01T23:59:59.000Z