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Note: This page contains sample records for the topic "vaisala ceilometer vceil" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

ARM - Instrument - vceil  

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

govInstrumentsvceil govInstrumentsvceil Documentation VCEIL : Handbook VCEIL : Instrument Mentor Monthly Summary (IMMS) reports VCEIL : 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 : Vaisala Ceilometer (VCEIL) Beneficiary of Recovery Act funding. Instrument Categories Cloud Properties, Atmospheric Profiling Picture of the Vaisala Ceilometer (Model CL31) Picture of the Vaisala Ceilometer (Model CL31) General Overview The Vaisala Ceilometer (VCEIL) is a self-contained, ground-based, active, remote-sensing device designed to measure cloud-base height, vertical visibility, and potential backscatter signals by aerosols. It detects up to three cloud layers simultaneously. Model CL31 has a maximum vertical range

2

ARM: ARSCL: multiple outputs from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR  

DOE Data Explorer (OSTI)

ARSCL: multiple outputs from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR

Richard Coulter; Kevin Widener; Nitin Bharadwaj; Karen Johnson; Timothy Martin

3

ARM: ARSCL: cloud boundaries from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR  

DOE Data Explorer (OSTI)

ARSCL: cloud boundaries from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR

Richard Coulter; Kevin Widener; Nitin Bharadwaj; Karen Johnson; Timothy Martin

4

ARM: ARSCL: cloud base height from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR  

DOE Data Explorer (OSTI)

ARSCL: cloud base height from first Clothiaux algorithms on Vaisala or Belfort ceilometers, Micropulse lidar, and MMCR

Richard Coulter; Kevin Widener; Nitin Bharadwaj; Karen Johnson; Timothy Martin

5

Detection of Cloud-Base Height Using Jenoptik CHM15K and Vaisala CL31 Ceilometers  

Science Conference Proceedings (OSTI)

Twelve case studies of multilayer cloud-base height (CBH) retrievals from two collocated ceilometers (Vaisala CL31 and Jenoptik CHM15K) have been analyzed. The studies were performed during the period from September to December 2008 at the Mace ...

Giovanni Martucci; Conor Milroy; Colin D. O’Dowd

2010-02-01T23:59:59.000Z

6

Quantitative Interpretation of Laser Ceilometer Intensity Profiles  

Science Conference Proceedings (OSTI)

The authors have used a commercially available laser ceilometer to measure vertical profiles of the optical extinction in rain. This application requires special signal processing to correct the raw data for the effects of receiver noise, high-...

R. R. Rogers; M-F. Lamoureux; L. R. Bissonnette; R. M. Peters

1997-06-01T23:59:59.000Z

7

Radiation Dry Bias of the Vaisala RS92 Humidity Sensor  

Science Conference Proceedings (OSTI)

The comparison of simultaneous humidity measurements by the Vaisala RS92 radiosonde and by the Cryogenic Frostpoint Hygrometer (CFH) launched at Alajuela, Costa Rica, during July 2005 reveals a large solar radiation dry bias of the Vaisala RS92 ...

H. Vömel; H. Selkirk; L. Miloshevich; J. Valverde-Canossa; J. Valdés; E. Kyrö; R. Kivi; W. Stolz; G. Peng; J. A. Diaz

2007-06-01T23:59:59.000Z

8

DISCLAIMER  

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

DOE/SC-ARM-TR-020 DOE/SC-ARM-TR-020 Vaisala Ceilometer (VCEIL) Handbook VR Morris March 2012 Work supported by the U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research VR Morris, March 2012, DOE/SC-ARM-TR-020 ii Contents 1.0 General Overview ................................................................................................................................. 1 2.0 Contacts ................................................................................................................................................ 1 2.1 Mentor .......................................................................................................................................... 1 3.0 Deployment Locations and History ...................................................................................................... 1

9

Impact of Vaisala Radiosonde Humidity Corrections on ARM IOP...  

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

Proceedings, St. Petersburg, Florida, April 8-12, 2002 Impact of Vaisala Radiosonde Humidity Corrections on ARM IOP Data L. M. Miloshevich National Center for Atmospheric...

10

Ceilometer Retrieval of the Boundary Layer Vertical Aerosol Extinction Structure  

Science Conference Proceedings (OSTI)

The CT25K ceilometer is a general-purpose cloud height sensor employing lidar technology for detection of clouds. In this paper it is shown that it can also be used to retrieve aerosol optical properties in the boundary layer. The authors present ...

K. M. Markowicz; P. J. Flatau; A. E. Kardas; J. Remiszewska; K. Stelmaszczyk; L. Woeste

2008-06-01T23:59:59.000Z

11

ARM - Datastreams - ceilpblht  

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

Datastreamsceilpblht Datastreamsceilpblht Documentation Data Quality Plots Citation DOI: 10.5439/1095593 [ What is this? ] Generate Citation 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 Datastream : CEILPBLHT Boundary-layer height data with VCEIL Active Dates 2011.06.09 - 2014.01.09 Measurement Categories Atmospheric State Originating Instrument Vaisala Ceilometer (VCEIL) Measurements Only measurements considered scientifically relevant are shown below by default. Show all measurements Measurement Units Variable Altitude above mean sea level m alt Base time in Epoch seconds since 1970-1-1 0:00:00 0:00 base_time Planetary boundary layer height First boundary layer height candidate meters bl_height_1 ( time )

12

Pressure and Temperature Differences between Vaisala RS80 and RS92 Radiosonde Systems  

Science Conference Proceedings (OSTI)

In several twin flight campaigns, Vaisala RS80 radiosonde systems report lower temperatures than Vaisala RS92 systems in the daytime. Simultaneous differences increase from less than 0.1 K at pressure altitudes below 100 hPa to 0.7 K at 10 hPa. ...

Wolfgang Steinbrecht; Hans Claude; Fritz Schönenborn; Ulrich Leiterer; Horst Dier; Eckhard Lanzinger

2008-06-01T23:59:59.000Z

13

Cloud Signals from Lidar and Rotating Beam Ceilometer Compared with Pilot Ceiling  

Science Conference Proceedings (OSTI)

Cloud signals from a vertically pointing, range-corrected ruby lidar and a rotating beam ceilometer showed excellent agreement in the height at which peak signal occurred. However, pilot reports of ceiling were at significantly lower altitude ...

W. L. Eberhard

1986-09-01T23:59:59.000Z

14

Cloud-Base Height Measurements with a Single-Pulse Erbium-Glass Laser Ceilometer  

Science Conference Proceedings (OSTI)

A cloud ceilometer using a solid-state laser was developed by the French meteorological office in association with Sfim ODS. The transmitter is an eye-safe erbium-glass laser operating at 1.54 ?m.

J. L. Gaumet; J. C. Heinrich; M. Cluzeau; P. Pierrard; J. Prieur

1998-02-01T23:59:59.000Z

15

On the Quantitative Low-Level Aerosol Measurements Using Ceilometer-Type Lidar  

Science Conference Proceedings (OSTI)

The objective of this work is to investigate whether a commercial ceilometer-type lidar can be used as a quantitative aerosol measurement instrument. To this end, lidar backscattering measurements are compared with exact theoretical calculations ...

Anu-Maija Sundström; Timo Nousiainen; Tuukka Petäjä

2009-11-01T23:59:59.000Z

16

Characterization and Correction of Relative Humidity Measurements from Vaisala RS80-A Radiosondes at Cold Temperatures  

Science Conference Proceedings (OSTI)

Radiosonde relative humidity (RH) measurements are known to be unreliable at cold temperatures. This study characterizes radiosonde RH measurements from Vaisala RS80-A thin-film capacitive sensors in the temperature range 0° to ?70°C. Sources of ...

Larry M. Miloshevich; Holger Vömel; Ari Paukkunen; Andrew J. Heymsfield; Samuel J. Oltmans

2001-02-01T23:59:59.000Z

17

Development and Validation of a Time-Lag Correction for Vaisala Radiosonde Humidity Measurements  

Science Conference Proceedings (OSTI)

This study presents a method of improving the accuracy of relative humidity (RH) measurements from Vaisala RS80 and RS90 radiosondes by applying sensor-based corrections for well-understood sources of measurement error. Laboratory measurements of ...

Larry M. Miloshevich; Ari Paukkunen; Holger Vömel; Samuel J. Oltmans

2004-09-01T23:59:59.000Z

18

Improved Daytime Column-Integrated Precipitable Water Vapor from Vaisala Radiosonde Humidity Sensors  

Science Conference Proceedings (OSTI)

Accurate water vapor profiles from radiosondes are essential for long-term climate prediction, weather prediction, validation of remote sensing retrievals, and other applications. The Vaisala RS80, RS90, and RS92 radiosondes are among the more ...

K. E. Cady-Pereira; M. W. Shephard; D. D. Turner; E. J. Mlawer; S. A. Clough; T. J. Wagner

2008-06-01T23:59:59.000Z

19

Dry Bias and Variability in Vaisala RS80-H Radiosondes: The ARM Experience  

Science Conference Proceedings (OSTI)

Thousands of comparisons between total precipitable water vapor (PWV) obtained from radiosonde (Vaisala RS80-H) profiles and PWV retrieved from a collocated microwave radiometer (MWR) were made at the Atmospheric Radiation Measurement (ARM) ...

D. D. Turner; B. M. Lesht; S. A. Clough; J. C. Liljegren; H. E. Revercomb; D. C. Tobin

2003-01-01T23:59:59.000Z

20

ARM - Measurement - Cloud base height  

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

base height base height 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 base height For a given cloud or cloud layer, the lowest level of the atmosphere where cloud properties are detectable. 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 BLC : Belfort Laser Ceilometer MPL : Micropulse Lidar MWRP : Microwave Radiometer Profiler RL : Raman Lidar VCEIL : Vaisala Ceilometer External Instruments NOAASURF : NOAA Surface Meteorology Data, collected by NWS and NCDC

Note: This page contains sample records for the topic "vaisala ceilometer vceil" 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

Balloon-borne sounding system (BBSS): Vaisala-processed winds, press., temp, and RH  

DOE Data Explorer (OSTI)

Balloon-borne sounding system (BBSS): Vaisala-processed winds, press., temp, and RH. The balloon-borne sounding system (SONDE) provides in situ measurements (vertical profiles) of both the thermodynamic state of the atmosphere, and the wind speed and direction.

Coulter,Richard; Ritsche,Michael

22

Corrections of Humidity Measurement Errors from the Vaisala RS80 Radiosonde—Application to TOGA COARE Data  

Science Conference Proceedings (OSTI)

A series of laboratory tests have been conducted on several different batches of Vaisala RS80 radiosondes to understand and develop methods to correct six humidity measurement errors, including chemical contamination, temperature dependence, ...

Junhong Wang; Harold L. Cole; David J. Carlson; Erik R. Miller; Kathryn Beierle; Ari Paukkunen; Tapani K. Laine

2002-07-01T23:59:59.000Z

23

Daytime Mixed Layer over the Santiago Basin: Description of Two Years of Observations with a Lidar Ceilometer  

Science Conference Proceedings (OSTI)

Two years of high-resolution backscatter profiles obtained with a commercial lidar ceilometer in Santiago Basin (33.5°S, 70.6°W) are analyzed. The generally large aerosol load in the Santiago atmospheric boundary layer (ABL) facilitates the use ...

Ricardo C. Muñoz; Angella A. Undurraga

2010-08-01T23:59:59.000Z

24

ARM - Measurement - Planetary boundary layer height  

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

govMeasurementsPlanetary boundary layer height govMeasurementsPlanetary boundary layer height 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 : Planetary boundary layer height Top of the planetary boundary layer; also known as depth or height of the mixing layer. Categories Atmospheric State 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 VCEIL : Vaisala Ceilometer External Instruments NCEPGFS : National Centers for Environment Prediction Global Forecast System Field Campaign Instruments

25

Radiation Dry Bias Correction of Vaisala RS92 Humidity Data and Its Impacts on Historical Radiosonde Data  

Science Conference Proceedings (OSTI)

The Vaisala RS92 radiosonde is the most widely used type of sonde in the current global radiosonde network. One of the largest biases in the RS92 humidity data is its daytime solar radiation dry bias (SRDB). An algorithm [referred to as NCAR ...

Junhong Wang; Liangying Zhang; Aiguo Dai; Franz Immler; Michael Sommer; Holger Vömel

2013-02-01T23:59:59.000Z

26

Recent Changes in NWS Upper-Air Observations with Emphasis on Changes from VIZ to Vaisala Radiosondes  

Science Conference Proceedings (OSTI)

Recent changes in the NWS upperair observing network are listed and an analysis is presented of the change in 1995 from VIZ to Vaisala radiosonde instruments. Results are shown for 14 stations at 850, 700, 500, 100, and 50 hPa and atboth 0000 and ...

William P. Elliott; Rebecca J. Ross; William H. Blackmore

2002-07-01T23:59:59.000Z

27

ARM - Datastreams - vceil25k  

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

ARIES Observatory, Nainital, Uttarkhand, India PVC M1 Browse Data Highland Center, Cape Cod MA; AMF 1 PYE M1 Browse Data Point Reyes, CA SBS M1 Browse Data Steamboat Springs CO,...

28

Tropospheric Comparisons of Vaisala Radiosondes and Balloon-Borne Frost-Point and Lyman-? Hygrometers during the LAUTLOS-WAVVAP Experiment  

Science Conference Proceedings (OSTI)

The accuracy of all types of Vaisala radiosondes and two types of Snow White chilled-mirror hygrosondes was assessed in an intensive in situ comparison with reference hygrometers. Fourteen nighttime reference comparisons were performed to ...

T. M. Suortti; R. Kivi; A. Kats; V. Yushkov; N. Kämpfer; U. Leiterer; L. M. Miloshevich; R. Neuber; A. Paukkunen; P. Ruppert; H. Vömel

2008-02-01T23:59:59.000Z

29

In Situ Validation of a Correction for Time-Lag and Bias Errors in Vaisala RS80-H Radiosonde Humidity Measurements  

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

In Situ Validation of a Correction for Time-Lag and In Situ Validation of a Correction for Time-Lag and Bias Errors in Vaisala RS80-H Radiosonde Humidity Measurements L. M. Miloshevich National Center for Atmospheric Research Boulder, Colorado H. Vömel and S. J. Oltmans National Oceanic and Atmospheric Administration Boulder, Colorado A. Paukkunen Vaisala Oy Helsinki, Finland Introduction Radiosonde relative humidity (RH) measurements are fundamentally important to Atmospheric Radiation Measurement (ARM) Program goals because they are used in a wide variety of both operational and research applications, including initialization of numerical models and evaluation of model results, validation of remote-sensor water vapor retrievals, construction of water vapor climatologies and studies of climate trends, parameterization of cloud processes, and as input to

30

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

31

Comparison of Satellite Cloud Masks with Ceilometer Sky Conditions in Southern Finland  

Science Conference Proceedings (OSTI)

The cloud mask is an essential product derived from satellite data. Whereas cloud analysis applications typically make use of information from cloudy pixels, many other applications require cloud-free conditions. For this reason many ...

Sauli Joro; Otto Hyvärinen; Janne Kotro

2010-12-01T23:59:59.000Z

32

Correction of Humidity Bias for Vaisala RS80-A Sondes during the AMMA 2006 Observing Period  

Science Conference Proceedings (OSTI)

During the African Monsoon Multidisciplinary Analyses (AMMA) program, which included a special observing period that took place over West Africa in 2006, a major effort was devoted to monitor the atmosphere and its water cycle. The radiosonde ...

Mathieu Nuret; Jean-Philippe Lafore; Françoise Guichard; Jean-Luc Redelsperger; Olivier Bock; Anna Agusti-Panareda; Jean-Blaise N’Gamini

2008-11-01T23:59:59.000Z

33

Dry Bias in Vaisala RS90 Radiosonde Humidity Profiles over Antarctica  

Science Conference Proceedings (OSTI)

Middle to upper tropospheric humidity plays a large role in determining terrestrial outgoing longwave radiation. Much work has gone into improving the accuracy of humidity measurements made by radiosondes. Some radiosonde humidity sensors ...

Penny M. Rowe; Larry M. Miloshevich; David D. Turner; Von P. Walden

2008-09-01T23:59:59.000Z

34

Correction of Humidity Biases in Vaisala RS80-H Sondes during NAME  

Science Conference Proceedings (OSTI)

Examination of the upper-air sonde data taken in conjunction with the North American Monsoon Experiment (NAME) revealed that data at several sites in the core monsoon region exhibited a significant dry bias. In this study, a simple, yet effective,...

Paul E. Ciesielski; Richard H. Johnson; Junhong Wang

2009-09-01T23:59:59.000Z

35

Accurate Liquid Water Path Retrieval from Low-Cost Microwave Radiometers Using Additional Information from a Lidar Ceilometer and Operational Forecast Models  

Science Conference Proceedings (OSTI)

Water clouds have an important impact on the radiative balance of the earth. The use of ground-based dual-frequency microwave radiometers to derive both liquid water path (LWP) and water vapor path (WVP) is well established, but uncertainties ...

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

2007-09-01T23:59:59.000Z

36

Accurate Liquid Water Path Retrieval from Low-Cost Microwave Radiometers Using Additional Information from a Lidar Ceilometer and Operational Forecast Models  

E-Print Network (OSTI)

, but their presence in the liquid rather than the ice phase can lead to shortwave flux changes of about 100 W m 2 (NWP). In most operational NWP models, production of rain by collision and coalescence is parameterized

Reading, University of

37

Performance of the Vaisala RS80A/H and RS90 Humicap Sensors and the Meteolabor “Snow White” Chilled-Mirror Hygrometer in Paramaribo, Suriname  

Science Conference Proceedings (OSTI)

In climate research there is a strong need for accurate observations of water vapor in the upper atmosphere. Radiosoundings provide relative humidity profiles but the accuracy of many routine instruments is notoriously inadequate in the cold ...

Gé Verver; Masatomo Fujiwara; Pier Dolmans; Cor Becker; Paul Fortuin; Larry Miloshevich

2006-11-01T23:59:59.000Z

38

Performance of the Meteolabor “Snow White” Chilled-Mirror Hygrometer in the Tropical Troposphere: Comparisons with the Vaisala RS80 A/H-Humicap Sensors  

Science Conference Proceedings (OSTI)

The “Snow White” hygrometer is a low-cost, chilled-mirror hygrometer for radiosonde applications provided by a Swiss company, Meteolabor AG. A total of 54 Snow White soundings were conducted at five tropical stations in different seasons in 2000–...

Masatomo Fujiwara; Masato Shiotani; Fumio Hasebe; Holger Vömel; Samuel J. Oltmans; Paul W. Ruppert; Takeshi Horinouchi; Toshitaka Tsuda

2003-11-01T23:59:59.000Z

39

Seasonal Variability in the Diurnal Evolution of the Boundary Layer in a Near-Coastal Urban Environment  

Science Conference Proceedings (OSTI)

Boundary layer height is estimated during a 21-month period in Houston, Texas, using continuous ceilometer observations and the minimum-gradient method. A comparison with over 60 radiosondes indicates overall agreement between ceilometer- and ...

Christine L. Haman; Barry Lefer; Gary A. Morris

2012-05-01T23:59:59.000Z

40

Intercomparison of Atmospheric Soundings from the Aerosonde and Radiosonde  

Science Conference Proceedings (OSTI)

This paper presents a preliminary evaluation of meteorological measurements made by the Aerosonde (using Vaisala, Inc., RS90 sensors) by comparing them with closely correlated measurements made using traditional balloonborne sondes (Vaisala RS80-...

Jade R. Soddell; Kendal McGuffie; Greg J. Holland

2004-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "vaisala ceilometer vceil" 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

Characterization of a Biomimetic Polymeric Lipid Bilayer by ...  

Science Conference Proceedings (OSTI)

... VAISALA, Inc.) model HMD70Y. Temperature was controlled by a Neslab model RTE-111 chiller- heater (Thermo Neslab). 92 ...

2003-01-16T23:59:59.000Z

42

miller-er-99.PDF  

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

Correction for Dry Bias in Vaisala Radiosonde RH Data Correction for Dry Bias in Vaisala Radiosonde RH Data E. R. Miller, J. Wang, and H. L. Cole National Center for Atmospheric Research Atmospheric Technology Division Boulder, Colorado Abstract Extensive data analysis of sounding data from the Tropical Ocean Global Atmosphere-Coupled Ocean Atmosphere Response Experiment (TOGA-COARE) and other research projects coupled with supporting evidence from other sources have lead to the conclusion that there is a dry bias in Vaisala radiosonde relative humidity (RH) measurements. This dry bias occurs in both the A-type and H-type radiosonde RH sensors. Convinced of the problem, Vaisala engineers conducted extensive chamber tests on Vaisala sondes of varying age. Vaisala determined that the dry bias was due to contamination

43

liljegren(3)-99.PDF  

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

site to site. MWR-BBSS Comparisons The correction to the RS-80 radiosonde relative humidity measurement developed by Vaisala results in increased relative humidity. The...

44

1  

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

Atlanta, Georgia, March 19-23, 2001 1 Preliminary Correction of Vaisala Radiosonde Humidity Measurements for Slow Sensor Time-Response at Cold Temperatures L. M. Miloshevich and...

45

DOE/SC-ARM-TR-102 Sonde Adjust Value-Added Product Technical...  

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

... 14 Figures 1 The original and corrected relative humidity profile for Vaisala RS-92 radiosondes launched at the SGP Central Facility on May 12,...

46

1  

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

from the research vessel Ronald H. Brown (RHB) were available. In contrast to the earlier Pilot Radiation Observation Experiment (PROBE), the lot numbers of the Vaisala RAOBs were...

47

No Slide Title  

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

Static Port Sensors Transducers and signal amplifiers Transducers and signal amplifiers * Water vapor chilled mirror and simpler Vaisala system for redundancy on water vapor...

48

1  

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

Vaisala RS-80H Radiosonde Vaisala RS-80H Radiosonde Dry-Bias Correction Redux B. M. Lesht Environmental Research Division Argonne National Laboratory Argonne, Illinois S. J. Richardson Department of Meteorology Pennsylvania State University University Park, Pennsylvania Introduction In previous studies (e.g., Lesht 1997, 1998, 1999; Lesht and Richardson 2001; Richardson et al. 2000) we examined the effects of dry bias in Vaisala RS-80H radiosonde humidity measurements on Atmospheric Radiation Measurement (ARM) data. Some of this analysis was done by using a preliminary version of a humidity correction algorithm that was developed by Vaisala in conjunction with their colleagues at the National Center for Atmospheric Research (NCAR). Because Vaisala insisted that the information included in the algorithm be proprietary, we were required to execute a

49

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

50

Advances in Continuously Profiling the Thermodynamic State of the Boundary Layer: Integration of Measurements and Methods  

Science Conference Proceedings (OSTI)

This paper describes advances in ground-based thermodynamic profiling of the lower troposphere through sensor synergy. The well-documented integrated profiling technique (IPT), which uses a microwave profiler, a cloud radar, and a ceilometer to ...

Ulrich Löhnert; S. Crewell; O. Krasnov; E. O’Connor; H. Russchenberg

2008-08-01T23:59:59.000Z

51

Ground-Based and Satellite Observations of Cloud Fields in the Netherlands  

Science Conference Proceedings (OSTI)

A study is performed on the combination of ground-based and satellite observations for the derivation of cloud properties. Ground-based measurements from a lidar ceilometer and an infrared radiometer were combined with measurements of the NOAA ...

Arnout Feut; André van Lammeren

1996-09-01T23:59:59.000Z

52

Recent Trends in Cloudiness over the United States: A Tale of Monitoring Inadequacies  

Science Conference Proceedings (OSTI)

Automated Surface Observation Systems (ASOS) were widely introduced to replace manned weather stations around the mid-1990s over North America and other parts of the world. While laser beam ceilometers of the ASOS in North America measure ...

Aiguo Dai; Thomas R. Karl; Bomin Sun; Kevin E. Trenberth

2006-05-01T23:59:59.000Z

53

On the Structural Characteristics of Steady Finite-Amplitude Mountain Waves over Bell-Shaped Topography  

Science Conference Proceedings (OSTI)

The characteristics of the two-dimensional steady state flow of unbounded stratified Boussinesq fluid over an isolated obstacle of finite height are analyzed for the simplqst case in which the incident flow speed, UO, and Brunt-Vaisala frequency, ...

R. Laprise; W. R. Peltier

1989-02-01T23:59:59.000Z

54

The Helsinki Testbed: A Mesoscale Measurement, Research, and Service Platform  

Science Conference Proceedings (OSTI)

The Finnish Meteorological Institute and Vaisala have established a mesoscale weather observational network in southern Finland. The Helsinki Testbed is an open research and quasi-operational program designed to provide new information on ...

Jarkko T. Koskinen; Jani Poutiainen; David M. Schultz; Sylvain Joffre; Jarmo Koistinen; Elena Saltikoff; Erik Gregow; Heikki Turtiainen; Walter F. Dabberdt; Juhani Damski; Noora Eresmaa; Sabine Göke; Otto Hyvärinen; Leena Järvi; Ari Karppinen; Janne Kotro; Timo Kuitunen; Jaakko Kukkonen; Markku Kulmala; Dmitri Moisseev; Pertti Nurmi; Heikki Pohjola; Pirkko Pylkkö; Timo Vesala; Yrjö Viisanen

2011-03-01T23:59:59.000Z

55

Simultaneous Measurements of Atmospheric Water Vapor with MIR, Raman Lidar, and Rawinsondes  

Science Conference Proceedings (OSTI)

Simultaneous measurements of atmospheric water vapor were made by the Millimeter-wave Imaging Radiometer (MIR), Raman lidar, and rawinsondes. Two types of rawinsonde sensor packages (AIR and Vaisala) were carried by the same balloon. The measured ...

J. R. Wang; S. H. Melfi; P. Racette; D. N. Whitemen; L. A. Chang; R. A. Ferrare; K. D. Evans; F. J. Schmidlin

1995-07-01T23:59:59.000Z

56

The Influence of Radiosonde “Age” on TRMM Field Campaign Soundings Humidity Correction  

Science Conference Proceedings (OSTI)

Hundreds of Vaisala sondes with an RS80-H Humicap thin-film capacitor humidity sensor were launched during the Tropical Rainfall Measuring Mission (TRMM) field campaigns (1999) Large Scale Biosphere–Atmosphere (LBA) experiment held in Brazil and ...

Biswadev Roy; Jeffrey B. Halverson; Junhong Wang

2004-03-01T23:59:59.000Z

57

Unexplained Discontinuity in the U.S. Radiosonde Temperature Data. Part I: Troposphere  

Science Conference Proceedings (OSTI)

Inhomogeneities in U.S. radiosonde data that used the VIZ and Vaisala RS80 cannot be explained by radiation errors, which can be removed by the heat balance models. WMO intercomparision data, modeling results, temperature time series, and 1200 ...

Robert E. Eskridge; James K. Luers; C. R. Redder

2003-07-01T23:59:59.000Z

58

Convective Boundary Layer Depth Estimation from Wind Profilers: Statistical Comparison between an Automated Algorithm and Expert Estimations  

Science Conference Proceedings (OSTI)

A previous study showed success in determining the convective boundary layer depth with radar wind-profiling radars using fuzzy logic methods, and improvements to the earlier work are discussed. The improved method uses the Vaisala multipeak ...

Laura Bianco; James M. Wilczak; Allen B. White

2008-08-01T23:59:59.000Z

59

Research Highlight  

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

Improved Daytime Precipitable Water Vapor from Vaisala Radiosonde Humidity Improved Daytime Precipitable Water Vapor from Vaisala Radiosonde Humidity Sensors Download a printable PDF Submitter: Cady-Pereira, K. E., Atmospheric and Environmental Research, Inc. Mlawer, E. J., Atmospheric & Environmental Research, Inc. Turner, D. D., National Oceanic and Atmospheric Administration Shephard, M. W., Atmospheric and Environmental Research, Inc. Clough, S. A., Atmospheric and Environmental Research, Inc. Area of Research: Atmospheric Thermodynamics and Vertical Structures Working Group(s): Radiative Processes Journal Reference: Cady-Pereira, K, M Shephard, E Mlawer, D Turner, S Clough, and T Wagner. 2008. "Improved daytime column-integrated precipitable water vapor from Vaisala radiosonde humidity sensors." Journal of Atmospheric and Oceanic Technology doi: 10.1175/2007JTECHA1027.1.

60

1  

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Improved Water Vapor Measurements Improved Water Vapor Measurements from ARM Radiosondes L. Miloshevich and A. J. Heymsfield National Center for Atmospheric Research Boulder, Colorado A. Paukkunen Vaisala Oy Helsinki, Finland Introduction Accurate radiosonde measurements of water vapor in the mid and upper troposphere are important for such applications as evaluating remote-sensor water vapor retrievals, initializing numerical models, and improving parameterizations of radiative and cloud processes. Measurements of relative humidity (RH) from Vaisala radiosondes are subject to several measurement errors, most of which increase in magnitude with decreasing temperature (Miloshevich et al. 2000). Several of these measurement errors have already been corrected in part of the Atmospheric Radiation Measurement (ARM) Program dataset

Note: This page contains sample records for the topic "vaisala ceilometer vceil" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


61

Southern Great Plains Newsletter  

SciTech Connect

This months issue contains the following articles: (1) Scientists convene at SGP site for complex convective cloud experiment; (2) VORTEX2 spins down; (3) Sunphotometer supports SPARTICUS (a Sun and Aureole Measurement imaging sunphotometer) campaign and satellite validation studies; and (4) Ceilometer represents first deployment of new ground-based instruments from Recovery Act.

J. Prell L. R. Roeder

2010-09-01T23:59:59.000Z

62

Cloud response to the meandering Kuroshio Extension front  

Science Conference Proceedings (OSTI)

A unique set of observations onboard research vessel (R/V) Mirai in April 2010 captured a striking cloud hole over a cold meander of the Kuroshio Extension (KE) east of Japan as corroborated by atmospheric soundings, ceilometer, ship-board ...

Hiroyuki Tomita; Shang-Ping Xie; Hiroki Tokinaga; Yoshimi Kawai

63

Unexplained Discontinuity in the U.S. Radiosonde Temperature Data. Part II: Stratosphere  

Science Conference Proceedings (OSTI)

The second part of this two-part article discusses the differences between observations taken at 0000 and 1200 UTC, particularly in the stratosphere, by the Vaisala RS80-57H radiosondes that are integrated within the National Weather Service's (...

Christopher R. Redder; Jim K. Luers; Robert E. Eskridge

2004-08-01T23:59:59.000Z

64

Advanced Lidars for ARM: What Would We Get?  

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CMWG Breakout Session CMWG Breakout Session 2009 ARM Science Team Meeting Advanced Lidars for ARM: What Would We Get? Dave Turner, Ed Eloranta University of Wisconsin - Madison CMWG Breakout Session 2009 ARM Science Team Meeting What is an "Advanced Lidar?" (1) * Ceilometer - Max range ~7km, unpolarized, uncalibrated * Micropulse lidar (MPL) - Sensitive to clouds & aerosols throughout troposphere - Small telescope, rep rate is 1.5 kHz, microjoules of power - Loses sensitivity to cirrus in upper trop during the day - Polarization sensitive - Uncalibrated * Backscatter signals measured by both the MPL and the Ceilometer are convolutions of molecular and particle scattering events - Unable to determine particle extinction without significant assumptions - Main use by ARM has been to determine layer boundaries

65

ARM - Publications: Science Team Meeting Documents  

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

Radiosonde Intercomparison During the Fall 2000 Water Vapor IOP Radiosonde Intercomparison During the Fall 2000 Water Vapor IOP Lesht, B.M. (a) and Richardson, S.J. (b), Argonne National Laboratory (a), University of Oklahoma (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting We conducted 160 dual-radiosonde soundings during the fall 2000 Water Vapor Intensive Operations Period (WVIOP). The soundings were done every three hours at the SGP/CART site central facility from 1430 on 18 September 2000 through 1130 on 8 October 2000. The dual soundings included Vaisala RH-80H radiosondes from four different calibration lots as well as Vaisala RS-90 radiosondes. The radisondes were distributed during the experiment so as to conduct pairwise comparisons between RS-80s, RS-90s and RS-80s/RS-90s. Prior to the WVIOP we tested the calibration of these types of radiosondes

66

ARM - Facility News Article  

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Improved Radiosonde Sensor Ready for Launch Improved Radiosonde Sensor Ready for Launch Bookmark and Share At the end of a string tied to the weather balloon, a small sensor package, called a radiosonde, contains the "brains" for measuring atmospheric temperature, pressure and humidity. At the end of a string tied to the weather balloon, a small sensor package, called a radiosonde, contains the "brains" for measuring atmospheric temperature, pressure and humidity. As part of the Balloon Borne Sounding System, radiosondes launched at the the ARM Climate Research Facility sites are supplied by Vaisala, one of the market leaders of this technology. Vaisala began phasing out production of the RS90 radiosondes at the end of calendar year 2004 in favor of their new RS92 model. The new version has an improved global positioning system

67

ARM - PI Product - Radiosondes Corrected for Inaccuracy in RH Measurements  

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ProductsRadiosondes Corrected for Inaccuracy in RH ProductsRadiosondes Corrected for Inaccuracy in RH Measurements Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send PI Product : Radiosondes Corrected for Inaccuracy in RH Measurements 2000.01.01 - 2005.12.31 Site(s) SGP General Description Corrections for inaccuracy in Vaisala radiosonde RH measurements have been applied to ARM SGP radiosonde soundings. The magnitude of the corrections can vary considerably between soundings. The radiosonde measurement accuracy, and therefore the correction magnitude, is a function of atmospheric conditions, mainly T, RH, and dRH/dt (humidity gradient). The corrections are also very sensitive to the RH sensor type, and there are 3 Vaisala sensor types represented in this dataset (RS80-H, RS90, and RS92).

68

ovtchinnikov-98.pdf  

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51 51 Cloud Remote Sensing Using ARM Instruments: Observations and Modeling M. Ovtchinnikov and Y. L. Kogan Cooperative Institute for Mesoscale Meteorological Studies Norman, Oklahoma Introduction The constantly expanding Atmospheric Radiation Measure- ment (ARM) instrumental base for observing clouds now consists of about a dozen instruments including ceilometers, lidars, and a cloud radar. The majority of these instruments provides indirect measurements and requires a use of retrieval algorithms to deduce cloud properties needed for developing and testing cloud parameterizations for general circulation models (GCMs). In situ aircraft measurements during intensive observation periods (IOPs) are intended to provide ground truth for testing these retrieval procedures.

69

SOAR Data: Data from Shipboard Oceanographic and Atmospheric Radiation (SOAR)1999 through 2001  

DOE Data Explorer (OSTI)

SOAR is a global network of research and volunteer ships that carry global change instrumentation. The primary emphasis for SOAR is solar and IR radiation but some ships cary ceilometers, meteorological instruments, and related equipment. All data are collected in a central data collection computer and the flexible data collection software can be adapted to any other user instrumentation. Currently SOAR is installed pas permanent instrumentation on four ships operating in the western Pacific, eastern tropical Pacific, West Indies, and an oceanographic ship that operates around the world. In addition, six other system are used on cruises of opportunity. [Taken from SOAR homepage at http://www.gim.bnl.gov/soar/index.html

70

I  

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BAECC: BAECC: I ni*al S ite L ayout AOS Instrument Field, radars, and containers Instrument F ield a nd C ontainers 6 0 m 9 0 m Met Twr T r e e H e i g h t ~ 2 0 M T r e e H e i g h t ~ 2 0 m Tree Height ~5m T r e e H e i g h t ~ 2 0 m K A Z R B S R W P P D M Rad Tables: mfrsr, TSI skyrad, SPN 10 M Scale M W A C R MWR mounted side by side with 1 m in between scan direction indicated by arrows MWR3C p w r P W R D r o p G P R W P A N T E Q 1 9 0 f t 6 4 f t E Q 2 u n d e r s a c r E Q 1 A N T Snow Fence Measurements a re c lose a pproximates. S ite w as l aid o ut D uring A ug S ite V isit Container P ad D etail AMF2 SACR OPS Van GP Van RWP Van 20' 90' 64' PWR 20' 20' mpl 2d VD MAERI BBSS cart WBRG VCEIL Instrument Field 10" 10' 10" 10" 10" SWACR Antenna EQ1 Van AMFX SACR 20' EQ2 under SACR Instrument F ield 1 1 2 3 2 3 Instrument F ield Looking S outh E ast Looking S outh Looking N orth E ast Looking N orth W---Band a nd K a---Band R adar

71

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

72

ARM - Publications: Science Team Meeting Documents  

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Sizes, Fractional Coverage, and Radar Doppler Moments Profiles of Sizes, Fractional Coverage, and Radar Doppler Moments Profiles of Fair-Weather Cumulus Clouds at the TWP ARM Site Kollias, P., Albrecht B.A., and Dow B.J., University of Miami Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Fair-weather cumuli are fundamental in regulating the vertical structure of water vapor and entropy in the lowest 2 km of the Earth's atmosphere over vast areas of the oceans. Using data from the mm-wavelength cloud radar, the micro-pulse lidar and ceilometer at the Nauru (TWP-ARM) site, a statistical description of the field of fair weather cumulus is inferred. Frequency diagrams of cloud thickness, fractional coverage, updraft-downdraft magnitudes and cloud reflectivity are calculated. The relationship of the statistical behavior of the cumulus field to the

73

ARM - Publications: Science Team Meeting Documents  

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

Boundary Layer Structure and Fair-Weather Cumulus Characteristics at the Boundary Layer Structure and Fair-Weather Cumulus Characteristics at the TWP ARM Site - Comparisons with Other Tropical and Subtropical Sites Albrecht, B. and Kollias, P., University of Miami Thirteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting Fair-weather cumuli are fundamental in regulating the vertical structure of water vapor and entropy in the lowest 2 km of the Earths atmosphere over vast areas of the oceans. Boundary layer structures and cloud characteristics observed at Nauru (ARM TWP) during suppressed convective conditions are compared with those observed at other tropical and subtropical sites. Over three years of data from the mm-wavelength cloud radar and ceilometer observations at the Nauru site are analyzed and a statistical description of the field of fair weather cumulus is inferred.

74

Section 74  

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Comparisons of the Micropulse Lidar and the Belfort Comparisons of the Micropulse Lidar and the Belfort Laser Ceilometer at the Atmospheric Radiation Measurement Southern Great Plains Cloud and Radiation Testbed Site D.D. Turner Pacific Northwest National Laboratory Richland, Washington Introduction The general goal of the Atmospheric Radiation Measurement (ARM) Program is to improve general circulation and related models of the atmosphere for global and regional prediction (DOE 1990). In order to achieve this goal, the ARM Program is collecting a prodigious volume of data at its first Cloud and The time period selected to do the comparisons between the Radiation Testbed (CART) in the Southern Great Plains of the instruments was April 4, 1994, through May 8, 1994. In this United States. Some quantities, such as cloud base height, can

75

Research Highlight  

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Cloud Observations at Niamey During the AMF Deployment Cloud Observations at Niamey During the AMF Deployment Submitter: Kollias, P., McGill University Area of Research: Cloud Distributions/Characterizations Working Group(s): Cloud Properties Journal Reference: Kollias, P. and M. A. Miller, 2007: Cloud and Precipitation Observations at Niamey During the 2006 ARM Mobile Facility Deployment. Submitted to Geophysical Research Letters. Daily observed cloud fraction in Niamey during the AMF deployment. The cloud fraction is derived using measurements from the 94-GHz radar, the MPL, and the ceilometer. The vertical resolution is 260 m, and a 5-day temporal filter is applied to the daily cloud fraction profiles. (a) Monthly-averaged cloud and precipitation fraction. The monthly mean and standard deviation of cirrus cloud top (white line), middle cloud tops

76

Microsoft PowerPoint - ARMST2009.shupeposter.ppt [Compatibility Mode]  

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

Spring and Fall Arctic Mixed-Phase Clouds: Spring and Fall Arctic Mixed-Phase Clouds: Perspectives from the surface during ISDAC and MPACE Matthew Shupe a , David Turner b , Ed Eloranta b , Pavlos Kollias c p a CIRES - University of Colorado and NOAA/ESRL, b University of Wisconsin- Madison, c McGill University Summary Cloud Boundaries -Cloud top identified using radar, cloud base identified using high spectral resolution lidar or ceilometer. Phase Classification Uses phase specific signatures from radar lidar microwave radiometer and radiosonde measurements (Shupe GRL 2007) Retrieval Methods Analysis involves 6 weeks of single-layer, stratiform, mixed-phase cloud observations from the NSA site during MPACE (Sept-Nov 2004) and ISDAC (April-May 2008)  Similar structure and processes occur in Arctic stratiform

77

ARM - Field Campaign - Winter Single Column Model IOP  

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govCampaignsWinter Single Column Model IOP govCampaignsWinter Single Column Model IOP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Winter Single Column Model IOP 1999.01.19 - 1999.02.08 Lead Scientist : David Randall Data Availability Actual data files for a number of past SCM IOPs are available from the ARM Archive under IOPs/UAV. Cloud and Radiation Products Derived from Satellite Data Colorado State's Single Column Modeling Home Page For data sets, see below. Description A second winter SCM IOP was conducted (1/19 - 2/8/99) to provide additional sampling of winter weather conditions. This was the first SCM IOP where AERIs and ceilometers were installed at the boundary facilities to give retrievals of temperature and moisture to supplement the sounding data. A

78

Section 18  

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Analysis of the Temperature Dependence of Low Cloud Optical Thickness Using ARM Data and the GISS GCM A. D. Del Genio NASA/Goddard Institute for Space Studies New York, New York A. B. Wolf Science Systems and Applications, Inc. New York, New York G. Tselioudis Columbia University New York, New York One of the larger uncertainties in global climate model C The Belfort Laser Ceilometer (BLC) measures cloud base estimates of sensitivity to external perturbations is the height projected climate change of cloud optical thickness. Conventional wisdom suggests that since an adiabatically C The Geostationary Operational Environmental Satellite lifted parcel condenses more water if its temperature is higher, (GOES) infrared satellite brightness temperatures identify its optical thickness should increase with warming. For low

79

ARM - Field Campaign - Observations and Modeling of the Green Ocean Amazon:  

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

govCampaignsObservations and Modeling of the Green Ocean Amazon: SKIP govCampaignsObservations and Modeling of the Green Ocean Amazon: SKIP Pre-campaign Measurements Related Campaigns Observations and Modeling of the Green Ocean Amazon (GOAMAZON 2014) 2014.01.01, Martin, AMF Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Observations and Modeling of the Green Ocean Amazon: SKIP Pre-campaign Measurements 2013.03.15 - 2015.12.31 Lead Scientist : Heath Powers For data sets, see below. Description The Self-Kontained Instrument Platform (SKIP) container is being deployed at the T3 GOAmazon site containing a basic set of meteorological and radiometric instrumentation including: SMET, SKYRAD, GRNRAD, and ceilometer (all ARM instruments), an ozone monitor, and a nitric Oxide/nitrogen

80

ARM - Publications: Science Team Meeting Documents  

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

Comparison of Boundary Layer Cloud Properties using Surface and GOES Comparison of Boundary Layer Cloud Properties using Surface and GOES Measurements at the ARM SGP Site Dong, X. (a), Minnis, P. (b), Smith, W.L., Jr. (b), and Mace, G.G. (a), University of Utah (a), NASA Langley Research Center (b) Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting Boundary layer cloud microphysical and radiative properties derived from GOES data during March 2000 cloud IOP at ARM SGP site are compared with simultaneous surface-based observations. The cloud-droplet effective radius, optical depth, and top-of-atmoshpere (TOA) albedo are retrieved from a 2-stream radiative transfer model in conjunction with ground-based measurements of cloud radar, laser ceilometer, microwave and solar radiometers. The satellite results are retrieved from GOES visible and

Note: This page contains sample records for the topic "vaisala ceilometer vceil" 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

ackerman-98.pdf  

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

One-Year Cloud Climatology for the One-Year Cloud Climatology for the Southern Great Plains Site T. P. Ackerman, R. T. Marchand, and E. E. Clothiaux Department of Meteorology The Pennsylvania State University University Park, Pennsylvania Introduction The addition of the millimeter wave cloud radar (MMCR) to the suite of instruments at the Southern Great Plains (SGP) site has provided the necessary observations to produce a cloud climatology. Data from the MMCR are currently being combined with data from the Belfort laser ceilometer (BLC) and micropulse lidar (MPL) to determine cloud occurrence and location using algorithms developed by our research group. These basic cloud statistics should prove useful for comparing with both single-column model (SCM) and general circulation model (GCM) predictions of cloud

82

PowerPoint Presentation  

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

SIRTA, a French Atmospheric Observatory SIRTA, a French Atmospheric Observatory for Clouds, Aerosols and Water Vapor Institut Pierre Simon Laplace, France H. Chepfer Coordinator : M. Haeffelin (haeffelin@lmd.polytechnique.fr) Contributors : C. Boitel, D. Bouniol, M. Chiriaco, P. Drobinski, J-L. Dusfrene, C. Goukenleuque, M. Grall, A. Hodzic, F. Hourdin, F. Lapouge, A Mathieu, P. Minnis, Y. Morille, C. Naud, V. Noel, B. O'Hirok, J. Pelon, C. Pietras, A. Protat, B. Romand, R. Vautard SIRTA : Atmospheric Remote Sensing 25 km south of Paris Palaiseau (48.7 o N, 2.2 o E) SIRTA Instrumentation LIDAR B-scat Lidar (532, 1064) Clouds, aerosols properties 1999 Ceilometer (KNMI) Cloud, BL Height 2002 IR Doppler Lidar (10.6 mm) 3D Wind 1999

83

Evaluating the Contribution of Climate Forcing and Forest Dynamics to Accelerating Carbon Sequestration by Forest Ecosystems in the Northeastern U.S.  

Science Conference Proceedings (OSTI)

We used 10 Hz eddy flux signals and 0.2 Hz incident radiation (global shortwave and PAR) records from Harvard Forest (Massachusetts) and Tapajos National Forest (Brazil) to establish empirical relationships among directly measured cloud type and cover percentage and corresponding PAR fluctuations and its diffuse fraction. In future work such a cloud characterization will be related to water and light use efficiency estimates for each of these ecosystems. We developed empirical relationships to link sky cover type and fraction (measured with the ceilometer) to incident direct and diffuse PAR. We developed a methodology for constructing synthetic incident solar radiation time series based on operational reports of sky cover and cloud type from National Weather Service METAR reports. The aim of this work is to document the temporal and spectral properties radiation incident on the canopy, as a first step toward developing a sky-type parameterization for the net carbon uptake models.

Fitzjarrald, David Roy [Atmos Sciences Res Ctr] Atmos Sciences Res Ctr

2013-09-11T23:59:59.000Z

84

ARM - Datastreams - sondewnpn  

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

Datastreamssondewnpn Datastreamssondewnpn Documentation XDC documentation Data Quality Plots Citation DOI: 10.5439/1021460 [ What is this? ] Generate Citation 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 Example sondewnpn Archive Data Plot Example sondewnpn Archive Data Plot Datastream : SONDEWNPN Balloon-borne sounding system (BBSS): Vaisala-processed winds, press., temp, &RH Active Dates 1994.04.12 - 2014.01.10 Measurement Categories Atmospheric State Originating Instrument Balloon-Borne Sounding System (SONDE) Measurements Only measurements considered scientifically relevant are shown below by default. Show all measurements Measurement Units Variable altitude meters above Mean Sea Level alt ( time )

85

Atmospheric Radiation Measurement Climate Research Facility | Argonne  

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Atmospheric Radiation Measurement Climate Research Facility Atmospheric Radiation Measurement Climate Research Facility Argonne scientists study climate change 1 of 22 Argonne scientists study climate change The U.S. Department of Energy's Office of Science provided $60 million in ARRA funding for climate research to the Atmospheric Radiation Measurement (ARM) Climate Research Facility, a DOE national user facility that has been operating climate observing sites around the world for nearly two decades. These sites help scientists study clouds and their influence on the sun's radiant energy, which heats our planet. Above is one of the purchases: the Vaisala Present Weather Detector. It optically measures visibility, present weather, precipitation intensity, and precipitation type. It provides a measure of current weather conditions by combining measurements from three

86

Thunderhead Radiation Measurements and Radiative Flux Analysis in Support of STORMVEX  

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

Thunderhead Radiation Thunderhead Radiation Measurements and Radiative Flux Analysis in Support of STORMVEX Chuck Long Jay Mace Intent * Provide downwelling broadband radiation measurements at Thunderhead * Physically small footprint portable system * Designed to provide inputs necessary for Radiative Flux Analysis Basic RFA System COPS Hornisgrinde Deployment 1200m elevation System Components * Eppley ventilated PSP * Eppley ventilated PIR * Delta-T SPN-1 * Vaisala HMP-50 T/RH probe * Campbell CR23X datalogger SPN-1 Radiometer * Uses 7 thermopile detectors and a patented shading pattern * Measures Total and Diffuse SW with no moving parts * Includes internal heaters Relative accuracy StDev = 13.6 Winter Mountain Deployment Frost/Snow Mitigation * NSA Heated Ventilator Evaluation IOP - Testing various configurations and

87

Research Highlight  

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

Comparisons Between Radiosondes and Remote Sensors During the 2004 NSA Comparisons Between Radiosondes and Remote Sensors During the 2004 NSA Arctic Winter Radiometric Experiment Submitter: Westwater, E. R., University of Colorado Area of Research: Atmospheric Thermodynamics and Vertical Structures Working Group(s): Radiative Processes Journal Reference: Mattioli, V, ER Westwater, D Cimini, JS Liljegren, BM Lesht, SI Gutman, and FJ Schmidlin. 2007. "Analysis of radiosonde and ground-based remotely sensed PWV data from the 2004 North Slope of Alaska Arctic Winter Radiometric Experiment." Journal of Atmospheric and Oceanic Technology 243: 415-431. Description of radiosondes launched during the 2004 NSA Arctic Winter Radiometric Experiment. Dual-radiosonde launch of the Vaisala RS90 and Chilled Mirror radiosondes is pictured here.

88

ARM - Datastreams - sondewrpn  

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Datastreamssondewrpn Datastreamssondewrpn Documentation XDC documentation Data Quality Plots 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 Datastream : SONDEWRPN Balloon-borne sounding system (BBSS): research winds, Vaisala press., temp, &RH Active Dates 1994.04.20 - 2002.05.27 Measurement Categories Atmospheric State Originating Instrument Balloon-Borne Sounding System (SONDE) Measurements Only measurements considered scientifically relevant are shown below by default. Show all measurements Measurement Units Variable altitude meters above Mean Sea Level alt ( time ) Ascent Rate m/s asc ( time ) Base time in Epoch seconds since 1970-1-1 0:00:00 0:00 base_time Horizontal wind Wind Direction deg deg ( time )

89

ARM - Field Campaign - Arctic Winter Water Vapor IOP  

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govCampaignsArctic Winter Water Vapor IOP govCampaignsArctic Winter Water Vapor IOP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Arctic Winter Water Vapor IOP 2004.03.09 - 2004.04.09 Lead Scientist : Ed Westwater Data Availability http://www.etl.noaa.gov/programs/2004/wviop/data will contain quicklooks of all of the data. For data sets, see below. Summary During the IOP, the Ground-based Scanning Radiometer of NOAA/ETL, and the ARM MicroWave Radiometer and Microwave Profiler, yielded excellent data over a range of conditions. In all, angular-scanned and calibrated radiometric data from 22.345 to 380 GHz were taken. The Precipitable Water Vapor varied about an order of magnitude from 1 to 10 mm, and surface temperatures varied from about -10 to -40 deg. Celcius. Vaisala RS90

90

ARM - Facility News Article  

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15, 2007 [Facility News] 15, 2007 [Facility News] Radiosonde Temperature Sensor Benefits from Stronger Structure Bookmark and Share The new temperature sensor (front and back shown above) for the RS92 radiosonde sports an integrated fiber-reinforced structure that improves durability while maintaining the needed measurement accuracy and response. The new temperature sensor (front and back shown above) for the RS92 radiosonde sports an integrated fiber-reinforced structure that improves durability while maintaining the needed measurement accuracy and response. Small sensor packages called radiosondes (or "sondes") are used to transmit atmospheric information from weather balloons as they rise through the air. Vaisala, the supplier of sondes used at all the ARM sites, has introduced

91

ARM - Datastreams - sondewnpr  

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Datastreamssondewnpr Datastreamssondewnpr Documentation XDC documentation Data Quality Plots 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 Datastream : SONDEWNPR Balloon-borne sounding system (BBSS): Vaisala winds, research press., temp, &RH Active Dates 1997.09.18 - 1997.09.26 Measurement Categories Atmospheric State Originating Instrument Balloon-Borne Sounding System (SONDE) Measurements Only measurements considered scientifically relevant are shown below by default. Show all measurements Measurement Units Variable Altitude above mean sea level m alt ( time ) Ascent Rate m/s asc ( time ) Base time in Epoch seconds since 1970-1-1 0:00:00 0:00 base_time Horizontal wind Wind Direction deg deg ( time )

92

Microsoft Word - AMF2 Instruments for BAECC.docx  

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AMF2 AMF2 I nstruments f or B AECC Instrument Mentor Instrument Name Manufacturer Measurement ASSISTII ( like an A eri) Connor F lynn ASSISTII LR---Tech, Inc. Temperature a nd w ater v apor p rofiles CSPHOT Laurie G regory Cimel Sunphotometer CIMEL Electronique Solar i rradiance and sky radiance IRT Vic M orris Infrared Thermometer Heimann Equivalent b lack b ody b rightness t emps MWR---2C Maria C adeddu Microwave Radiometer Radiometrics Column H 20 v apor a nd l iquid MWR---3C Maria C adeddu Microwave Radiometer Radiometrics Column H 20 v apor a nd l iquid TSI Vic Morris/Mike Reynolds Total S ky I mager Yankee Environmental Systems Cloud f raction v alues BBSS Donna Holdridge Balloon B orne Sounding S ystem Vaisala, I nc. Temp, h umidity, p ressure, w ind s peed a nd direction p rofiles

93

Analysis of Selected Radiosonde Data from the ARM/NSA Site  

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Analysis of Selected Radiosonde Data Analysis of Selected Radiosonde Data from the ARM/NSA Site B. Petracca, H. W. Church, and B. D. Zak Sandia National Laboratories Albuquerque, New Mexico R. Storvold and C. Marty Geophysical Institute University of Alaska Fairbanks, Alaska B. M. Lesht Argonne National Laboratories Argonne, Illinois Introduction The purpose of this study was to analyze differences in temperature and relative humidity (RH) profiles obtained from near-simultaneous radiosonde soundings made from different locations at and near the North Slope of Alaska (NSA) Cloud and Radiation Testbed (CART) site. The data for this study come from the Vaisala RS-80H radiosondes flown by Atmospheric Radiation Measurement (ARM) Program during the comparison periods, and from VIZ B2 radiosondes flown by the National Weather Service

94

ARM - Datastreams - sonicwind2d  

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Datastreamssonicwind2d Datastreamssonicwind2d Documentation Data Quality Plots 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 Datastream : SONICWIND2D Horizontal wind speed and direction from ultrasonic wind sensor (Vaisala WS425), 2m above ground on Barrow MET tower Active Dates 2003.10.31 - 2008.09.16 Measurement Categories Atmospheric State Originating Instrument ultrasonic wind sensor (SONICWIND) Measurements Only measurements considered scientifically relevant are shown below by default. Show all measurements Measurement Units Variable Horizontal wind Wind direction vector mean deg SonicWD_DU_WVT ( time ) Wind direction vector mean standard deviation deg SonicWD_SDU_WVT ( time ) Horizontal wind Wind speed arithmetic mean m/s SonicWS_S_WVT ( time )

95

ARM - Facility News Article  

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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,

96

Sonde Adjust Value-Added Product Technical Report  

DOE Green Energy (OSTI)

The Sonde Adjust (SONDEADJUST) value-added product (VAP) creates a file that includes all fields from original Atmospheric Radiation Measurement Climate Research Facility (ARM Facility) radiosonde files and contains several value-added fields that provide adjustments related to well-known humidity issues. SONDEADJUST produces data that correct documented biases in radiosonde humidity measurements. Previous efforts towards applying some of these corrections are available via the discontinued PI product sgpsondecorr1miloC1. Unique fields contained within this datastream include smoothed original relative humidity, dry bias corrected relative humidity, and final corrected relative humidity. The smoothed RH field refines the relative humidity from integers-the resolution of the instrument-to fractions of a percent. This profile is then used to calculate the dry bias corrected field. The final correction fixes the time-lag problem and uses the dry-bias field as input into the algorithm. In addition to dry bias, solar heating is another correction that is encompassed in the final corrected RH field. Output from SONDEADJUST differs from the previous RH-corrected datastreams in important ways. First, all three types of ARM radiosondes-Vaisala RS-80, RS-90, and RS-92-are corrected using dedicated procedures and/or parameters. Second, the output variables include all of those found in the original radiosonde file: dry bulb temperature, dewpoint temperature, wind speed, wind direction, eastward wind component, northward wind component, wind status (a Vaisala-produced field used in conjunction with the Loran system), ascent rate, and original relative humidity. Additional humidity fields are smoothed relative humidity, dry biased corrected relative humidity, final ambient relative humidity, and scaled adjusted relative humidity. Third, quality control (QC) flags of the fields from the original radiosonde datastream are brought into the SONDEADJUST output file. Additional QC variables are created for the new fields.

Troyan, D

2012-01-09T23:59:59.000Z

97

The computation of cloud base height from paired whole-sky imaging cameras  

SciTech Connect

A major goal for global change studies is to improve the accuracy of general circulation models (GCMs) capable of predicting the timing and magnitude of greenhouse gas-induced global warming. Research has shown that cloud radiative feedback is the single most important effect determining the magnitude of possible climate responses to human activity. Of particular value to reducing the uncertainties associated with cloud-radiation interactions is the measurement of cloud base height (CBH), both because it is a dominant factor in determining the infrared radiative properties of clouds with respect to the earth`s surface and lower atmosphere and because CBHs are essential to measuring cloud cover fraction. We have developed a novel approach to the extraction of cloud base height from pairs of whole sky imaging (WSI) cameras. The core problem is to spatially register cloud fields from widely separated WSI cameras; this complete, triangulation provides the CBH measurements. The wide camera separation (necessary to cover the desired observation area) and the self-similarity of clouds defeats all standard matching algorithms when applied to static views of the sky. To address this, our approach is based on optical flow methods that exploit the fact that modern WSIs provide sequences of images. We will describe the algorithm and present its performance as evaluated both on real data validated by ceilometer measurements and on a variety of simulated cases.

Allmen, M.C.; Kegelmeyer, W.P. Jr.

1994-03-01T23:59:59.000Z

98

Stability and Turbulence in the Atmospheric Boundary Layer: A Comparison of Remote Sensing and Tower Observations  

Science Conference Proceedings (OSTI)

When monitoring winds and atmospheric stability for wind energy applications, remote sensing instruments present some advantages to in-situ instrumentation such as larger vertical extent, in some cases easy installation and maintenance, measurements of vertical humidity profiles throughout the boundary layer, and no restrictions on prevailing wind directions. In this study, we compare remote sensing devices, Windcube lidar and microwave radiometer, to meteorological in-situ tower measurements to demonstrate the accuracy of these measurements and to assess the utility of the remote sensing instruments in overcoming tower limitations. We compare temperature and wind observations, as well as calculations of Brunt-Vaisala frequency and Richardson numbers for the instrument deployment period in May-June 2011 at the U.S. Department of Energy National Renewable Energy Laboratory's National Wind Technology Center near Boulder, Colorado. The study reveals that a lidar and radiometer measure wind and temperature with the same accuracy as tower instruments, while also providing advantages for monitoring stability and turbulence. We demonstrate that the atmospheric stability is determined more accurately when the liquid-water mixing ratio derived from the vertical humidity profile is considered under moist-adiabatic conditions.

Friedrich, K.; Lundquist, J. K.; Aitken, M.; Kalina, E. A.; Marshall, R. F.

2012-01-01T23:59:59.000Z

99

Loch Linnhe experiment 1994: Background stratification and shear measurements. Part 1: Profile summary and dispersion relations  

SciTech Connect

This report documents water column measurements made during the 1994 Loch Linnhe experiment, a joint US/UK radar ocean imaging experiment. Part 1 summarizes the profiles of temperature, salinity, density, Brunt-Vaisala frequency, and horizontal currents resolved into along and cross track directions. Internal wave dispersion relations, phase and group velocities, and eigenfunctions for modes 1 and 2 are computed for each profile. The effect of depth on these derived internal wave parameters is examined as well by computing eigenvalues and eigenfunctions for two different depths. The trials were conducted in Loch Linnhe, Scotland during the period from September 4, 1994 to September 17, 1994. The measurements reported herein were made from on board the R. V. Calanus, a research vessel operated by the Dunstaffnage Marine Laboratory (DML). The Calanus was moored approximately 125 meters from the track of the wake generating ship, either the R. V. Colonel Templer or a {open_quotes}Dog{close_quotes} class tug, the Collie. The depth at the mooring location was approximately 45 meters, while the depth at the closest point along the ship track was approximately 80 meters. For further details of the experiment, one is referred to the Loch Linnhe Experiment 1994: Trial Plan, Draft Version 3.0.

Robey, H.F.; Ravizza, D.L.

1994-10-10T23:59:59.000Z

100

A new white dwarf constraint on the rate of change of the gravitational constant  

E-Print Network (OSTI)

In this paper we derive a bound on the rate of change of the gravitational constant G coming from the pulsating white dwarf G117-B15A. This star is a ZZ Ceti pulsator extensively studied with astroseismological techniques for last three decades. The most recent determination of {\\dot P} = (2.3 \\pm 1.4) * 10^{-15} s/s^{-1} for the 215.2s fundamental mode agrees very well with predictions of the best fit theoretical model. The rate of change of the oscillation period can be explained by two effects: the cooling (dominant factor) and change of gravitational binding energy (residual gravitational contraction). Since the white dwarfs are pulsating in g-modes whose frequencies are related to the Brunt-Vaisala frequency (explicitly dependent on G) observational determination of the change of the period (more precisely the difference between observed and calculated \\dot P) can be used to set the upper bound on the rate of change of G. In the light of the current data concerning G117-B15A we derive the following bound: |{\\frac {\\dot G}{G}}| \\leq 4.10 \\times 10^{-10} yr^{-1}. Our result is model independent in the sense that it does not need to invoke a concrete physical theory (such like Brans-Dicke theory)underlying the temporal variability of G. We also demonstrate that varying gravitational constant G does not modify cooling of white dwarfs in a significant way. This result implies that some earlier claims present in the literature that varying G can be reflected in the WD luminosity function are not correct.

Marek Biesiada; Beata Malec

2003-03-21T23:59:59.000Z

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101

Total lightning observations of severe convection over North Texas  

E-Print Network (OSTI)

Five severe convective cells over North Texas from three separate dates were examined to determine what three dimensional, or “total” lightning data can add to the understanding of a convective cell’s intensity, propagation, and severe weather potential. Total lightning data were obtained from Vaisala Inc.’s Dallas/Fort Worth (D/FW) Lightning Detection and Ranging (LDAR) network. Radar data from two Weather Surveillance Radar – 1988 Doppler (WSR-88D) sites were used for position data and information regarding the intensity and kinematic properties of each cell. Total lightning products used by the National Weather Service Forecast Office in Fort Worth, Texas were compared to total lightning flash rate; a quantity that has been shown to be correlated to changes in cell intensity inferred from other sources, such as radar and satellite data. These products, specifically flash extent density (FED) were also compared to CG flash rate and radar derived measures from the WSR-88D sites. The results of this work show that FED and total flash rate are well correlated, with an average Pearson correlation value of 0.73, indicating that previous total flash rate results may also apply to FED. Lightning hooks, holes, and notches in FED displays indicated likely updraft regions, while appendages were observed to develop prior to deviant motion with two supercells. These results, combined with a greater update frequency provided a useful complement to radar data in the warning decision process. FED jumps were observed prior to several severe weather reports, indicating that total lightning activity may be related to updraft strength as found in past studies. However, FED jumps were sometimes observed without any associated severe event. More work is clearly needed to define what FED changes are of most importance in the short-term prediction of storm severity. The usefulness of the total lightning data on these dates was dependant upon LDAR network status and distance of the cell from the network center. The results of this study suggest that combining total flash rate trends with visual displays of FED provides the greatest added benefit to forecasters in maintaining situational awareness during warning operations.

McKinney, Christopher Michael

2008-08-01T23:59:59.000Z