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Note: This page contains sample records for the topic "marine boundary layer" from the National Library of EnergyBeta (NLEBeta).
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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

Measurements of the Marine Boundary Layer from an Airship  

Science Conference Proceedings (OSTI)

In 1992 and 1993, the authors made measurements of the marine boundary layer off the coast of Oregon from an airship. In 1992, these measurements consisted of coherent microwave backscatter measurements at Ku band taken from the gondola of the ...

William J. Plant; William C. Keller; Vahid Hesany; Kenneth Hayes; Karl W. Hoppel; Theodore V. Blanc

1998-12-01T23:59:59.000Z

2

Marine Boundary Layer Cloud Observations in the Azores  

Science Conference Proceedings (OSTI)

The recent deployment of the Atmospheric Radiation Measurement Program (ARM) Mobile Facility at Graciosa Island, Azores, in the context of the Clouds, Aerosol and Precipitation in the Marine Boundary Layer (CAP-MBL) field campaign added the most ...

Jasmine Rémillard; Pavlos Kollias; Edward Luke; Robert Wood

2012-11-01T23:59:59.000Z

3

Evolution of a Marine Boundary-Layer Jet  

Science Conference Proceedings (OSTI)

High-resolution profiles of temperature and wind-speed measurements were made with a tethered baloon in and above the marine boundary layer at San Nicolas Island (SNI) during a period when the cloud-free boundary layer grew from near the sea ...

H. Gerber; Simon Chang; Teddy Holt

1989-05-01T23:59:59.000Z

4

Modeling the Effects of the Spatially Varying Sea Surface Temperature on the Marine Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

A two-dimensional marine planetary boundary layer model is developed and applied to simulate the evolution of coupled dynamic, thermodynamic and cloud properties of the marine boundary layer over a zonally varying sea surface temperature field. ...

Mickey Man-Kui Wai

1988-01-01T23:59:59.000Z

5

On Mixed-Layer Modeling of the Stratocumulus-Topped Marine Boundary Layer  

Science Conference Proceedings (OSTI)

Research aircraft measurements of a well-developed marine stratocumulus cloud-topped boundary layer, made in June 1981 off the coast of California, are analyzed using the saturation point method developed by Betts. Estimates of the cloud-top ...

Howard P. Hanson

1984-04-01T23:59:59.000Z

6

Boundary Layer Depth, Entrainment, and Decoupling in the Cloud-Capped Subtropical and Tropical Marine Boundary Layer  

Science Conference Proceedings (OSTI)

Estimates of marine boundary layer (MBL) depth and degree of decoupling for two regions of the subtropical and tropical east Pacific are presented using satellite observations from the Moderate Resolution Imaging Spectroradiometer (MODIS) and the ...

Robert Wood; Christopher S. Bretherton

2004-09-01T23:59:59.000Z

7

A Cloudiness Transition in a Marine Boundary Layer  

Science Conference Proceedings (OSTI)

In situ aircraft data and lidar data are used to analyze a transition in the boundary layer thermodynamic structure from a clear boundary layer through small cumulus and broken stratocumulus to a deck of solid stratocumulus. The data was ...

Alan K. Betts; Reinout Boers

1990-06-01T23:59:59.000Z

8

Radar Observations of Humidity Variability in and above the Marine Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

Humidity variability at the top of the marine atmospheric boundary layer and in the overlying free troposphere was examined using data collected during the marine stratocumulus phase of the First Regional Experiment (FIRE) of the International ...

Allen B. White; C. W. Fairall; Dennis W. Thomson

1991-10-01T23:59:59.000Z

9

A New Parameterization for Shallow Cumulus Convection and Its Application to Marine Subtropical Cloud-Topped Boundary Layers. Part II: Regional Simulations of Marine Boundary Layer Clouds  

Science Conference Proceedings (OSTI)

The impact of physical parameterizations on simulations of cloud-topped marine boundary layers is investigated using the fifth-generation Pennsylvania State University–NCAR Mesoscale Model (MM5). Three-month MM5 simulations of the northeast and ...

James R. McCaa; Christopher S. Bretherton

2004-04-01T23:59:59.000Z

10

Observations of Vertical Velocity Skewness within the Marine Stratocumulus-Topped Boundary Layer  

Science Conference Proceedings (OSTI)

During June and July 1987 the First ISCCP (International Satellite Cloud Climatology Project) Regional Experiment (FIRE) was conducted within the marine stratocumulus-topped boundary layer off the coast of California. One of the goals of the ...

Kerry A. Moyer; George S. Young

1991-02-01T23:59:59.000Z

11

Evaluations of Diagnostic Marine Boundary-Layer Models Applied to Hurricanes  

Science Conference Proceedings (OSTI)

Four diagnostic marine boundary-layer models are evaluated for applicability to the hurricane regime. The goat was to develop an operational method of estimating surface variables with research aircraft flight-level (500 m) data. Evaluation ...

Mark D. Powell

1980-06-01T23:59:59.000Z

12

Synoptic Forcing Of Coastal-Trapped Disturbances in the Marine Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

Motivated by recent observations along the west coast of the United States, the authors investigate the generation and propagation of coastal-trapped disturbances in the marine atmospheric boundary layer. Analytic solutions are obtained in a ...

A. M. Rogerson; R. M. Samelson

1995-06-01T23:59:59.000Z

13

The Structure of the Unstable Marine Boundary Layer Viewed by Lidar and Aircraft Observations  

Science Conference Proceedings (OSTI)

The combination of vertical lidar and in situ meteorological observations from two aircraft provide an unprecedented view of the marine atmospheric boundary layer (MABL) during a cold air outbreak. To a first approximation, the lidar reflectivity ...

David Atlas; Bernard Walter; Shu-Hsien Chou; P. J. Sheu

1986-07-01T23:59:59.000Z

14

Parameterizing Grid-Averaged Longwave Fluxes for Inhomogeneous Marine Boundary Layer Clouds  

Science Conference Proceedings (OSTI)

This paper examines the relative impacts on grid-averaged longwave flux transmittance (emittance) for marine boundary layer (MBL) cloud fields arising from horizontal variability of optical depth ? and cloud sides. First, using fields of Landsat-...

Howard W. Barker; Bruce A. Wielicki

1997-12-01T23:59:59.000Z

15

Conditional Sampling of Updrafts and Downdrafts in the Marine Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

The properties of updrafts and downdrafts in the lower third of the marine atmospheric boundary layer (MABL) over the central Pacific Ocean are investigated using a conditional sampling technique. When the drafts are classified according to their ...

Siri Jodha Singh Khalsa; Gary K. Greenhut

1985-12-01T23:59:59.000Z

16

A Case Study of Ship Track Formation in a Polluted Marine Boundary Layer  

Science Conference Proceedings (OSTI)

A case study of the effects of ship emissions on the microphysical, radiative, and chemical properties of polluted marine boundary layer clouds is presented. Two ship tracks are discussed in detail. In situ measurements of cloud drop size ...

Kevin J. Noone; Doug W. Johnson; Jonathan P. Taylor; Ronald J. Ferek; Tim Garrett; Peter V. Hobbs; Philip A. Durkee; Kurt Nielsen; Elisabeth Öström; Colin O’Dowd; Michael H. Smith; Lynn M. Russell; Richard C. Flagan; John H. Seinfeld; Lieve De Bock; René E. Van Grieken; James G. Hudson; Ian Brooks; Richard F. Gasparovic; Robert A. Pockalny

2000-08-01T23:59:59.000Z

17

Turbulence and Radiation in Stratocumulus Topped Marine Boundary Layers: A Case Study from VOCALS-REx  

Science Conference Proceedings (OSTI)

Observations made during a 24 hour period as part of the VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx) are analyzed to study the radiation and turbulence associated with stratocumulus topped marine boundary layer (BL). ...

Virendra P. Ghate; Bruce A. Albrecht; Mark A. Miller; Alan Brewer; Christopher W. Fairall

18

A Modeling Study on the Fair Weather Marine Boundary Layer of the GATE  

Science Conference Proceedings (OSTI)

A three-dimensional ensemble-mean atmospheric model, with simplified second-moment turbulence closure equations and a statistical treatment for the condensation process, is used to simulate a fair weather marine boundary layer observed during the ...

T. Yamada; C-Y. J. Kao

1986-12-01T23:59:59.000Z

19

Relating Satellite-Observed Cloud Properties from MODIS to Meteorological Conditions for Marine Boundary Layer Clouds  

Science Conference Proceedings (OSTI)

This study examines 6 yr of cloud properties observed by the Moderate Resolution Imaging Spectroradiometer (MODIS) on board the NASA Terra satellite in five prominent marine boundary layer (MBL) cloud regions (California, Peru, Canary, Angola, ...

Guang J. Zhang; Andrew M. Vogelmann; Michael P. Jensen; William D. Collins; Edward P. Luke

2010-03-01T23:59:59.000Z

20

Intermittency and the Organization of Turbulence in the Near-Neutral Marine Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

Aircraft data from the JASIN Experiment have been used to examine the role that intermittency plays in turbulent transfer in the near-neutral marine atmospheric boundary layer. Conditional sampling, using the time-varying dissipation rate as an ...

William J. Shaw; Joost A. Businger

1985-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Airship Measurements of Ship’s Exhaust Plumes and Their Effect on Marine Boundary Layer Clouds  

Science Conference Proceedings (OSTI)

High-resolution aerosol, trace gas, and cloud microphysical measurements were made from an airship during transects across ships exhaust plumes advecting downwind of ships in the marine boundary layer (MBL). This study was part of the Office of ...

G. M. Frick; W. A. Hoppel

2000-08-01T23:59:59.000Z

22

The Marine Boundary Layer in the Vicinity of an Ocean Front  

Science Conference Proceedings (OSTI)

Aircraft observations obtained during the Frontal Air–Sea Interaction Experiment (FASINEX) are used to investigate the structure of the marine atmospheric boundary layer in the vicinity of an ocean front. A quasi-stationary sea surface ...

David P. Rogers

1989-07-01T23:59:59.000Z

23

Investigation of Regional and Seasonal Variations in Marine Boundary Layer Cloud Properties from MODIS Observations  

Science Conference Proceedings (OSTI)

To aid in understanding the role that marine boundary layer (MBL) clouds play in climate and assist in improving their representations in general circulation models (GCMs), their long-term microphysical and macroscale characteristics are ...

Michael P. Jensen; Andrew M. Vogelmann; William D. Collins; Guang J. Zhang; Edward P. Luke

2008-10-01T23:59:59.000Z

24

Large Eddy Simulation of Turbulent Flow in a Marine Convective Boundary Layer with Snow  

Science Conference Proceedings (OSTI)

A large eddy simulation (LES) model, with ice phase included, has been used to study the marine convective boundary layer filled with snow. Extensions to Moeng's LES model include the diagnosis of cloud ice mixing ratio, snow precipitation, and ...

Guan-Shu Rao; Ernest M. Agee

1996-01-01T23:59:59.000Z

25

Seasonal Variation of the Physical Properties of Marine Boundary Layer Clouds off the California Coast  

Science Conference Proceedings (OSTI)

Marine boundary layer (MBL) clouds can significantly regulate the sensitivity of climate models, yet they are currently poorly simulated. This study aims to characterize the seasonal variations of physical properties of these clouds and their ...

Wuyin Lin; Minghua Zhang; Norman G. Loeb

2009-05-01T23:59:59.000Z

26

Observational Evidence That Enhanced Subsidence Reduces Subtropical Marine Boundary Layer Cloudiness  

Science Conference Proceedings (OSTI)

Conventional wisdom suggests that subsidence favors the presence of marine stratus and stratocumulus because regions of enhanced boundary layer cloudiness are observed to climatologically co-occur with regions of enhanced subsidence. Here it is ...

Timothy A. Myers; Joel R. Norris

2013-10-01T23:59:59.000Z

27

Convectivc Elements in the Marine Atmospheric Boundary Layer. Part II: Entrainment at the Capping Inversion  

Science Conference Proceedings (OSTI)

Data from two aircraft flights in the marine atmospheric boundary layer are analyzed in an investigation of entrainment processes at the top of the well-mixed layer. Both days had strong wind shear across the inversion, which is reflected in the ...

Siri Jodha Singh Khalsa; Gary K. Greenhut

1987-07-01T23:59:59.000Z

28

Revisiting the Definition of the Drag Coefficient in the Marine Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

A new functional form of the neutral drag coefficient for moderate to high wind speeds in the marine atmospheric boundary layer for a range of field measurements as reported in the literature is proposed. This new form is found to describe a wide ...

Richard J. Foreman; Stefan Emeis

2010-10-01T23:59:59.000Z

29

Large-Eddy Simulations and Observations of Atmospheric Marine Boundary Layers above Nonequilibrium Surface Waves  

Science Conference Proceedings (OSTI)

Winds and waves in marine boundary layers are often in an unsettled state when fast-running swell generated by distant storms propagates into local regions and modifies the overlying turbulent fields. A large-eddy simulation (LES) model with the ...

Peter P. Sullivan; James B. Edson; Tihomir Hristov; James C. McWilliams

2008-04-01T23:59:59.000Z

30

Numerical Simulations of the Marine Stratocumulus-Capped Boundary Layer and Its Diurnal Variation  

Science Conference Proceedings (OSTI)

A high-resolution one-dimensional version of a second-order turbulence radiative–convective model, developed at Los Alamos National Laboratory, is used to simulate the diurnal cycle of the marine stratocumulus cloud-capped boundary layer. The ...

W. S. Smith; C-Y. J. Kao

1996-08-01T23:59:59.000Z

31

Observations of the Interaction between Cumulus Clouds and Warm Stratocumulus Clouds in the Marine Boundary Layer during ASTEX  

Science Conference Proceedings (OSTI)

Decoupling of the marine boundary layer beneath stratocumulus clouds and the formation of cumulus clouds at the top of a surface-based mixed layer (SML) have frequently been observed and modeled. When such cumulus clouds penetrate the overlying ...

G. M. Martin; D. W. Johnson; D. P. Rogers; P. R. Jonas; P. Minnis; D. A. Hegg

1995-08-01T23:59:59.000Z

32

Probability Density Functions of Liquid Water Path and Total Water Content of Marine Boundary Layer Clouds: Implications for Cloud Parameterization  

Science Conference Proceedings (OSTI)

Mathematical forms of probability density functions (PDFs) of liquid water path (LWP) and total water content for marine boundary layer clouds are investigated using the homogeneity, skewness, and kurtosis of PDFs of LWP obtained from observations ...

Hideaki Kawai; João Teixeira

2012-03-01T23:59:59.000Z

33

Marine Boundary-layer Structure and Circulation in the Region of Offshore Redevelopment of a Cyclone during GALE  

Science Conference Proceedings (OSTI)

Marine boundary-layer structure and circulation is documented for the 24 February 1986 case of offshore redevelopment of a cyclone during the Genesis of Atlantic Lows Experiment (GALE) Intensive Observing Period (IOP) 9. Mesoscale and satellite ...

Teddy Holt; Sethu Raman

1990-02-01T23:59:59.000Z

34

Inference of Marine Atmospheric Boundary Layer Moisture and Temperature Structure Using Airborne Lidar and Infrared Radiometer Data  

Science Conference Proceedings (OSTI)

A new technique for retrieving near-surface moisture and profiles of mixing ratio and potential temperature through the depth of the marine atmospheric boundary layer (MABL) using airborne lidar and multichannel infrared radiometer data is ...

Stephen P. Palm; Denise Hagan; Geary Schwemmer; S. H. Melfi

1998-03-01T23:59:59.000Z

35

Doppler Lidar–Based Wind-Profile Measurement System for Offshore Wind-Energy and Other Marine Boundary Layer Applications  

Science Conference Proceedings (OSTI)

Accurate measurement of wind speed profiles aloft in the marine boundary layer is a difficult challenge. The development of offshore wind energy requires accurate information on wind speeds above the surface at least at the levels occupied by ...

Yelena L. Pichugina; Robert M. Banta; W. Alan Brewer; Scott P. Sandberg; R. Michael Hardesty

2012-02-01T23:59:59.000Z

36

Large-Scale Structure of the June–July 1996 Marine Boundary Layer along California and Oregon  

Science Conference Proceedings (OSTI)

Data from surface stations, profilers, long-range aircraft surveys, and satellites were used to characterize the large-scale structure of the marine boundary layer off of California and Oregon during June and July 1996. To supplement these ...

C. E. Dorman; T. Holt; D. P. Rogers; K. Edwards

2000-06-01T23:59:59.000Z

37

Aircraft Measurements of Turbulence Spectra in the Marine Stratocumulus-topped Boundary Layer  

Science Conference Proceedings (OSTI)

Mixed-layer scaling was successfully applied to the velocity, temperature, and moisture spectra of the marine stratocumulus-topped mixed layers observed during the First ISCCP Regional Experiment (FIRE). These turbulence spectra provide ...

Jeffrey J. Nucciarone; George S. Young

1991-11-01T23:59:59.000Z

38

An Observation System Used To Study the Marine Boundary Layer Over the Bay of Bengal During Summer Monex 79  

Science Conference Proceedings (OSTI)

An observation system used to study the marine boundary layer over the Bay of Bengal at Digha Beach, West Bengal, India, as part of the International Monsoon Experiments (MONEX 79) is described in this paper. It was a portable system that was ...

S. SethuRaman; P. Michael; W. A. Tuthill; J. McNeil

1980-10-01T23:59:59.000Z

39

Twenty-Four-Hour Observations of the Marine Boundary Layer Using Shipborne NOAA High-Resolution Doppler Lidar  

Science Conference Proceedings (OSTI)

Shipborne observations obtained with the NOAA high-resolution Doppler lidar (HRDL) during the 1999 Nauru (Nauru99) campaign were used to study the structure of the marine boundary layer (MBL) in the tropical Pacific Ocean. During a day with weak ...

Volker Wulfmeyer; Tijana Janji?

2005-11-01T23:59:59.000Z

40

A Model of Marine Boundary-Layer Cloudiness for Mesoscale Applications  

Science Conference Proceedings (OSTI)

A one-dimensional version of a multilevel mesoscale model is used to represent the cloud-topped boundary layer (CTBL). Turbulent exchanges are parameterized with a prognostic equation for the turbulent kinetic energy and an improved length-scale ...

Peter Bechtold; Jean Pierre Pinty; Charles Fravalo

1992-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Simulating the Transition from Drizzling Marine Stratocumulus to Boundary Layer Cumulus with a Mesoscale Model  

Science Conference Proceedings (OSTI)

A case of coastal California summer season boundary layer cloud has been simulated with the U.S. Navy Coupled Ocean–Atmosphere Mesoscale Prediction System and the results analyzed in the context of consistency with conclusions derived from large ...

David B. Mechem; Yefim L. Kogan

2003-10-01T23:59:59.000Z

42

Relevance of the Mesoscale Entrainment Instability to the Marine Cloud-topped Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

Mesoscale variability in entrainment across the inversion capping the cloud-topped atmospheric boundary layer (CTBL) has been proposed as an explanation for mesoscale variability in cloud thickness. The relevance of this mechanism, called ...

Hugh A. Rand; Christopher S. Bretherton

1993-04-01T23:59:59.000Z

43

A Model for Particle Microphysics, Turbulent Mixing, and Radiative Transfer in the Stratocumulus-Topped Marine Boundary Layer and Comparisons with Measurements  

Science Conference Proceedings (OSTI)

A detailed 1D model of the stratocumulus-topped marine boundary layer is described. The model has three coupled components: a microphysics module that resolves the size distributions of aerosols and cloud droplets, a turbulence module that treats ...

Andrew S. Ackerman; Peter V. Hobbs; Owen B. Toon

1995-04-01T23:59:59.000Z

44

A Parameterization for Computing Grid-Averaged Solar Fluxes for Inhomogeneous Marine Boundary Layer Clouds. Part I: Methodology and Homogeneous Biases  

Science Conference Proceedings (OSTI)

A method of computing grid-averaged solar radiative fluxes for horizontally inhomogeneous marine boundary layer cloud fields is presented. Its underlying assumptions are as follows: i) the independent pixel approximation (IPA) is applicable and ...

Howard W. Barker

1996-08-01T23:59:59.000Z

45

A Moist PBL Parameterization for Large-Scale Models and Its Application to Subtropical Cloud-Topped Marine Boundary Layers  

Science Conference Proceedings (OSTI)

A new general purpose boundary layer parameterization that permits realistic treatment of stratocumulus-capped boundary layers (SCBLs) with coarse vertical resolution is described. It combines a 1.5-order turbulent closure model with an ...

Hervé Grenier; Christopher S. Bretherton

2001-03-01T23:59:59.000Z

46

Understanding the role of organic aerosol in the coastal and remote pacic marine boundary layer  

E-Print Network (OSTI)

Marine Fossil Fuel Combustion Biomass Burning Frequency (South Asia: Biomass or Fossil Fuel Combustion? Science 323 (whereas fossil fuel combustion and biomass burning emissions

Hawkins, Lelia Nahid

2010-01-01T23:59:59.000Z

47

Probability Density Functions of Liquid Water Path and Cloud Amount of Marine Boundary Layer Clouds: Geographical and Seasonal Variations and Controlling Meteorological Factors  

Science Conference Proceedings (OSTI)

The subgrid-scale variability of the liquid water path (LWP) of marine boundary layer clouds in areas that correspond to the typical grid size of large-scale (global climate and weather prediction) atmospheric models (200 km × 200 km) is ...

Hideaki Kawai; João Teixeira

2010-04-01T23:59:59.000Z

48

Intercomparison and Interpretation of Single-Column Model Simulations of a Nocturnal Stratocumulus-Topped Marine Boundary Layer  

Science Conference Proceedings (OSTI)

Ten single-column models (SCMs) from eight groups are used to simulate a nocturnal nonprecipitating marine stratocumulus-topped mixed layer as part of an intercomparison organized by the Global Energy and Water Cycle Experiment Cloud System Study,...

Ping Zhu; Christopher S. Bretherton; Martin Köhler; Anning Cheng; Andreas Chlond; Quanzhen Geng; Phil Austin; Jean-Christophe Golaz; Geert Lenderink; Adrian Lock; Bjorn Stevens

2005-09-01T23:59:59.000Z

49

Development and Testing of Instrumentation for UAV-Based Flux Measurements within Terrestrial and Marine Atmospheric Boundary Layers  

Science Conference Proceedings (OSTI)

Instrumentation packages have been developed for small (18–28 kg) unmanned aerial vehicles (UAVs) to measure momentum fluxes as well as latent, sensible, and radiative heat fluxes in the atmospheric boundary layer (ABL) and the topography below. ...

Benjamin D. Reineman; Luc Lenain; Nicholas M. Statom; W. Kendall Melville

2013-07-01T23:59:59.000Z

50

Regional Model Simulations of Marine Boundary Layer Clouds over the Southeast Pacific off South America. Part I: Control Experiment  

Science Conference Proceedings (OSTI)

A regional climate model is used to simulate boundary layer stratocumulus (Sc) clouds over the southeast Pacific off South America during August–October 1999 and to study their dynamical, radiative, and microphysical properties and their ...

Yuqing Wang; Shang-Ping Xie; Haiming Xu; Bin Wang

2004-01-01T23:59:59.000Z

51

Preliminary Results from Long-Term Measurements of Atmospheric Moisture in the Marine Boundary Layer in the Gulf of Mexico*  

Science Conference Proceedings (OSTI)

Measurements of boundary layer moisture have been acquired from Rotronic MP-100 sensors deployed on two National Data Buoy Center (NDBC) buoys in the northern Gulf of Mexico from June through November 1993. For one sensor that was retrieved ...

Laurence C. Breaker; David B. Gilhousen; Lawrence D. Burroughs

1998-06-01T23:59:59.000Z

52

Ozone observations and a model of marine boundary layer photochemistry during SAGA 3  

SciTech Connect

A major purpose of the third joint Soviet-American Gases and Aerosols (SAGA 3) oceanographic cruise was to examine remote tropical marine O{sub 3} and photochemical cycles in detail. On leg 1, which took place between Hilo, Hawaii, and Pago-Pago, American Samoa, in February and March 1990, shipboard measurements were made of O{sub 3}, CO, CH{sub 4}, nonmethane hydrocarbons (NMHC), NO, dimethyl sulfide (DMS), H{sub 2}S, H{sub 2}O{sub 2}, organic peroxides, and total column O{sub 3}. Postcruise analysis was performed for alkyl nitrates and a set of nonmethane hydrocarbons. A latitudinal gradient in O{sub 3} was observed on SAGA 3, with O{sub 3} north of the intertropical convergence zone (ITCZ) at 15-20 parts per billion by volume (ppbv) and less than 12 ppbv south of the ITCZ but never {le} 3 ppbv as observed on some previous equatorial Pacific cruises. Total column O{sub 3} (230--250 Dobson units (DU)) measured from the Akademik Korolev was within 8% of the corresponding total ozone mapping spectrometer (TOMS) satellite observations and confirmed the equatorial Pacific as a low O{sub 3} region. A one-dimensional photochemical model gives a self-consistent picture of O{sub 3}-NO-CO-hydrocarbon interactions taking place during SAGA 3. At typical equatorial conditions, mean O{sub 3} is 10 ppbv with a 10-15% diurnal variation and maximum near sunrise. Measurements of O{sub 3}, CO, CH{sub 4}, NMHC, and H{sub 2}O constrain model-calculated OH to 9 x 10{sup 5} cm{sup {minus}3} for 10 ppbv O{sub 3} at the equator. The concentrations of alkyl nitrates on SAGA 3 (5-15 pptv total alkyl nitrates) were up to 6 times higher than expected from currently accepted kinetics, suggesting a largely continental source for these species. However, maxima in isopropyl nitrate and bromoform near the equator as well as for nitric oxide may signify photochemical and biological sources of these species. 43 refs., 11 figs., 6 tabs.

Thompson, A.M. [NASA Goddard Space Flight Center, Greenbelt, MD (United States); Johnson, J.E.; Bates, T.S.; Kelly, K.C. [NOAA Pacific Marine Environmental Lab., Seattle, WA (United States); Torres, A.L. [NASA Goddard Space Flight Center, Wallops Island, VA (United States); Atlas, E.; Greenberg, J.P. [National Center for Atmospheric Research (NCAR), Boulder, CO (United States); Donahue, N.M. [Massachusetts Institute of Technology, Cambridge, MA (United States); Yvon, S.A.; Saltzman, E.S. [Univ. of Miami, FL (United States)] [and others

1993-09-20T23:59:59.000Z

53

A REVISED CONCEPTUAL MODEL OF THE TROPICAL MARINE BOUNDARY LAYER. PART I: STATISTICAL CHARACTERIZATION OF THE VARIABILITY INHERENT IN THE WINTERTIME TRADE WIND REGIME OVER THE WESTERN TROPICAL ATLANTIC  

Science Conference Proceedings (OSTI)

This paper investigates wintertime tropical marine boundary layer (TMBL) statistical characteristics over the western North Atlantic using the complete set of island-launched soundings from the Rain in Cumulus over the Ocean (RICO) Experiment. The ...

Jennifer L. Davison; Robert M. Rauber; Larry Di Girolamo; Margaret A. LeMone

54

Microphysical Structure of the Marine Boundary Layer under Strong Wind and Spray Formation as Seen from Simulations Using a 2D Explicit Microphysical Model. Part I: The Impact of Large Eddies  

Science Conference Proceedings (OSTI)

The effects of large eddies (LE) on the marine boundary layer (MBL) microphysics and thermodynamics is investigated using a 2D Lagrangian model with spectral bin microphysics including effects of sea spray. The 600 m × 400 m MBL computational area ...

J. Shpund; M. Pinsky; A. Khain

2011-10-01T23:59:59.000Z

55

A Revised Conceptual Model of the Tropical Marine Boundary Layer. Part I: Statistical Characterization of the Variability Inherent in the Wintertime Trade Wind Regime over the Western Tropical Atlantic  

Science Conference Proceedings (OSTI)

This paper investigates wintertime tropical marine boundary layer (TMBL) statistical characteristics over the western North Atlantic using the complete set of island-launched soundings from the Rain in Cumulus over the Ocean (RICO) experiment. The ...

Jennifer L. Davison; Robert M. Rauber; Larry Di Girolamo; Margaret A. LeMone

2013-10-01T23:59:59.000Z

56

Clouds, Aerosols and Precipitation in the Marine Boundary Layer (CAP-MBL) AMF Deployment Graciosa Island, Azores, NE Atlantic Ocean May 2009-December 2010  

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

the Marine Boundary Layer (CAP-MBL) Graciosa Island, Azores, NE Atlantic Ocean May 2009-December 2010 Rob Wood, University of Washington CAP-MBL Proposal Team AMF Deployment Team Thanks to Mark Miller: AMF Site Scientist Kim Nitschke: AMF Site Manager Importance of Low-Clouds for Climate Imperative that we understand the processes controlling the formation, maintenance and dissipation of low clouds in order to improve their representation in climate models. Which clouds matter for climate sensitivity? Climate Feedbacks Model Intercomparison Project (CFMIP) 12 slab ocean models 2xCO 2 - control Correlation of global mean CRF with local values Mark Webb, Hadley Center 90 N 45 N 0 45 S 90S 0 90 E 180 90 W 0

57

Challenges in Mesoscale Prediction of a Nocturnal Stratocumulus-Topped Marine Boundary Layer and Implications for Operational Forecasting  

Science Conference Proceedings (OSTI)

A numerical study using the fifth-generation Pennsylvania State University–National Center for Atmospheric Research Mesoscale Model (MM5) was performed to assess the impact of initial and boundary conditions, the parameterization of turbulence ...

Ramesh Vellore; Darko Kora?in; Melanie Wetzel; Steven Chai; Qing Wang

2007-10-01T23:59:59.000Z

58

The Structure of the Marine inversion Layer off the Central California Coast: Mesoscale Conditions  

Science Conference Proceedings (OSTI)

Data collected on board an instrumented aircraft during the Marine Atmospheric Boundary Layer Experiments, West Coast (MABLES WC) field study are examined. The data were collected at several levels in the marine and inversion layers approximately ...

Alison F. C. Bridger; William C. Brick; Peter F. Lester

1993-02-01T23:59:59.000Z

59

Modeling the Benthic Boundary Layer  

Science Conference Proceedings (OSTI)

A second-order turbulence closure model is used to study the development of the benthic boundary layer. Results are presented on the effects of a time-dependent oscillatory forcing flow and an initially stably stratified density gradient. Using ...

K. J. Richards

1982-05-01T23:59:59.000Z

60

Large-Eddy Boundary Layer Entrainment  

Science Conference Proceedings (OSTI)

A series of large-eddy simulations have been performed to explore boundary layer entrainment under conditions of a strongly capped inversion layer with the boundary layer dynamics driven dominantly by buoyant forcing. Different conditions ...

D. C. Lewellen; W. S. Lewellen

1998-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Monsoon Trough Boundary Layer Experiment (MONTBLEX)  

Science Conference Proceedings (OSTI)

The Monsoon Trough Boundary Layer Experiment (MONTBLEX) is a multi-institutional, all-India coordinated program to study the atmospheric boundary-layer processes in the monsoon trough (MT) area of northern India. The experiment is being organized ...

Malti Goel; H. N. Srivastava

1990-11-01T23:59:59.000Z

62

Ocean Boundary Mixing during Ekman Layer Arrest  

Science Conference Proceedings (OSTI)

As a water parcel comes into contact with an ocean boundary, energy is dissipated within the boundary layer with some fraction directed into vertical mixing. In a stratified flow this increases the potential energy associated with the density ...

Scott A. Condie

1999-12-01T23:59:59.000Z

63

The GATE Boundary Layer Instrumentation System (BLIS)  

Science Conference Proceedings (OSTI)

A tethered sonde, the Boundary Layer Instrument System (BLIS), was designed for use from shipboard platforms in the GARP Atlantic Tropical Experiment (GATE). This system was able to monitor the thermal and kinematic properties of the boundary ...

Donald P. Wylie; Chester F. Ropelewski

1980-09-01T23:59:59.000Z

64

Marine Stratocumulus Layers. Part 1: Mean Conditions  

Science Conference Proceedings (OSTI)

The mean radiational, dynamical and thermodynamical structure of the marine stratocumulus-topped mixed layers of the California coast is described for two days in June 1976 using data from the NCAR Electra aircraft. We suggest that the synoptic ...

R. A. Brost; D. H. Lenschow; J. C. Wyngaard

1982-04-01T23:59:59.000Z

65

Coexistence of Atmospheric Gravity Waves and Boundary Layer Rolls Observed by SAR  

Science Conference Proceedings (OSTI)

Both atmospheric gravity waves (AGW) and marine atmospheric boundary layer (MABL) rolls are simultaneously observed on an Environmental Satellite (Envisat) advanced synthetic aperture radar (ASAR) image acquired along the China coast on 22 May ...

Xiaofeng Li; Weizhong Zheng; Xiaofeng Yang; Jun A. Zhang; William G. Pichel; Ziwei Li

2013-11-01T23:59:59.000Z

66

Modification of the Atmospheric Boundary Layer by a Small Island: Observations from Nauru  

Science Conference Proceedings (OSTI)

Nauru, a small island in the tropical Pacific, generates cloud plumes that may grow to over 100-km lengths. This study uses observations to examine the mesoscale disturbance of the marine atmospheric boundary layer by the island that produces ...

Stuart Matthews; Jörg M. Hacker; Jason Cole; Jeffrey Hare; Charles N. Long; R. Michael Reynolds

2007-03-01T23:59:59.000Z

67

Dynamical Analysis of the Boundary Layer and Surface Wind Responses to Mesoscale SST Perturbations  

Science Conference Proceedings (OSTI)

The dynamical response of the marine atmospheric boundary layer (MABL) to mesoscale sea surface temperature (SST) perturbations is investigated over the Agulhas Return Current during winter from a 1-month, high-resolution, three-dimensional ...

Larry W. O’Neill; Steven K. Esbensen; Nicolai Thum; Roger M. Samelson; Dudley B. Chelton

2010-02-01T23:59:59.000Z

68

The Atmospheric Boundary Layer above the Agulhas Current during Alongcurrent Winds  

Science Conference Proceedings (OSTI)

The response of the marine atmospheric boundary layer to the strong sea surface temperature (SST) gradient across the warm Agulhas Current was studied in the Agulhas Current Air–Sea Exchange Experiment, south of Port Alfred, South Africa. ...

M. Rouault; A. M. Lee-Thorp; J. R. E. Lutjeharms

2000-01-01T23:59:59.000Z

69

Boundary layer convergence induced by strong winds across a midlatitude SST front  

Science Conference Proceedings (OSTI)

Recent studies indicate that midlatitude SST fronts’ influence extends through the marine atmospheric boundary layer (MABL) into the free atmosphere, with implications for climate variability. To better understand the mechanisms of this ocean-to-...

Thomas Kilpatrick; Niklas Schneider; Bo Qiu

70

An Evaluation of Boundary Conditions for Modeling Urban Boundary Layers  

DOE Green Energy (OSTI)

Numerical modeling of the urban boundary layer is complicated by the need to describe airflow patterns outside of the computational domain. These patterns have an impact on how successfully the simulation is able to model the turbulence associated with the urban boundary layer. This talk presents experiments with the model boundary conditions for simulations that were done to support two Department of Energy observational programs involving the Salt Lake City basin. The Chemical/Biological Non-proliferation Program (CBNP) is concerned with the effects of buildings on influencing dispersion patterns in urban environments. The Vertical Transport and Mixing Program (VTMX) investigating mixing mechanisms in the stable boundary layer and how they are influenced by the channeling caused by drainage flows or by obstacles such as building complexes. Both of these programs are investigating the turbulent mixing caused by building complexes and other urban obstacles.

Calhoun, R.J.; Chan, S.T.; Lee, R.L.

2000-05-18T23:59:59.000Z

71

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

72

Subsidence in the Nocturnal Boundary Layer  

Science Conference Proceedings (OSTI)

Nights with clear skies and strong radiative cooling that favor the formation of statically stable nocturnal boundary layers (NBL) are also those nights most likely to have subsidence, because of the presence of synoptic high-pressure regions. ...

Merrilee A. Carlson; Roland B. Stull

1986-08-01T23:59:59.000Z

73

Evaluating Formulations of Stable Boundary Layer Height  

Science Conference Proceedings (OSTI)

Stable boundary layer height h is determined from eddy correlation measurements of the vertical profiles of the buoyancy flux and turbulence energy from a tower over grassland in autumn, a tower over rangeland with variable snow cover during ...

D. Vickers; L. Mahrt

2004-11-01T23:59:59.000Z

74

Causal Viscosity in Accretion Disc Boundary Layers  

E-Print Network (OSTI)

The structure of the boundary layer region between the disc and a comparatively slowly rotating star is studied using a causal prescription for viscosity. The vertically integrated viscous stress relaxes towards its equilibrium value on a relaxation timescale $\\tau$, which naturally yields a finite speed of propagation for viscous information. For a standard alpha prescription with alpha in the range 0.1-0.01, and ratio of viscous speed to sound speed in the range 0.02-0.5, details in the boundary layer are strongly affected by the causality constraint. We study both steady state polytropic models and time dependent models, taking into account energy dissipation and transport. Steady state solutions are always subviscous with a variety of $\\Omega$ profiles which may exhibit near discontinuities. For alpha =0.01 and small viscous speeds, the boundary layer adjusted to a near steady state. A long wavelength oscillation generated by viscous overstability could be seen at times near the outer boundary. Being confined there, the boundary layer remained almost stationary. However, for alpha =0.1 and large viscous speeds, short wavelength disturbances were seen throughout which could significantly affect the power output in the boundary layer. This could be potentially important in producing time dependent behaviour in accreting systems such as CVs and protostars.

W. Kley; J. C. B. Papaloizou

1997-01-14T23:59:59.000Z

75

ARM - Field Campaign - Boundary Layer Cloud IOP  

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

govCampaignsBoundary Layer Cloud IOP govCampaignsBoundary Layer Cloud IOP Campaign Links Campaign Images Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Boundary Layer Cloud IOP 2005.07.11 - 2005.08.07 Lead Scientist : William Shaw For data sets, see below. Description Investigators from Pacific Northwest National Laboratory, in collaboration with scientists from a number of other institutions, carried out a month of intensive measurements at the ARM Climate Research Facility on the North Slope of Alaska in the summer of 2005. The purpose of these measurements was to determine how much the arctic land surface modifies the way low clouds reflect, absorb, and transmit solar and infrared radiation. This is an important problem because arctic clouds play a prominent role in

76

Boundary-Layer Damping of Baroclinic Instability  

Science Conference Proceedings (OSTI)

A shooting method is applied to a 100-level perturbation model with an explicit Ekman layer. Growth rates for a no-slip boundary condition are similar to those found previously. It is noted that the large cross-isobaric flow of the classic Ekman ...

D. O. Staley

1993-03-01T23:59:59.000Z

77

Spectral Scaling in a Tidal Boundary Layer  

Science Conference Proceedings (OSTI)

The simple scaling of a tidal bottom boundary layer by the shear velocity, u*, and the wall to the wall describes well the mean Bow field. To test the full extent of this scaling measurements were made of the turbulence spectra in a natural tidal ...

Thomas F. Gross; Arthur R. M. Nowell

1985-05-01T23:59:59.000Z

78

Direct Sampling of Entrainment Events in a Marine Stratocumulus Layer  

Science Conference Proceedings (OSTI)

Entrainment mixing and the stability of a marine stratocumulus layer are investigated using aircraft data gathered during the FIRE marine stratocumulus experiment. Direct measurement of entrainment events is accomplished through conditional ...

Siri Jodha S. Khalsa

1993-06-01T23:59:59.000Z

79

The Boundary Layer of Tropical Cyclone Kerry (1979)  

Science Conference Proceedings (OSTI)

The boundary layer structure of Tropical Cyclone Kerry (1979) is investigated using composite analysis of research aircraft, surface ship, and automatic weather station observations. The boundary layer was moist, convective, and strongly ...

Peter G. Black; Greg J. Holland

1995-07-01T23:59:59.000Z

80

Choosing a Boundary Layer Parameterization for Tropical Cyclone Modeling  

Science Conference Proceedings (OSTI)

The boundary layer in a tropical cyclone is in some respects unlike that elsewhere in the atmosphere. It is therefore necessary to evaluate boundary layer parameterizations for their suitability for use in tropical cyclone simulation. Previous ...

Jeffrey D. Kepert

2012-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Alternative Nonlocal Descriptions of Boundary-Layer Evolution  

Science Conference Proceedings (OSTI)

Two alternative parameterizations for nonlocal turbulence mixing are tested in a 1D boundary-layer model against a dataset from the 1983 Boundary-Layer Experiment (BLX83) in Oklahoma. One method, proposed previously by Stull and Driedonks, is ...

Qing Zhang; Roland Stull

1992-12-01T23:59:59.000Z

82

Evaluation of Boundary Layer Depth Estimates at Summit Station, Greenland  

Science Conference Proceedings (OSTI)

Boundary layer conditions in polar regions have been shown to have a significant impact on the levels of trace gases in the lower atmosphere. The ability to properly describe boundary layer characteristics (e.g., stability, depth, and variations ...

B. Van Dam; D. Helmig; W. Neff; L. Kramer

2013-10-01T23:59:59.000Z

83

Behavior of Turbulence Statistics in the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Velocity variances in the convective boundary layer are examined using data derived in PBL experiments over land (Minnesota) and ocean (the Coral Sea) supported by data from the Kansas study of the surface boundary layer. In the freely convective ...

B. B. Hicks

1985-06-01T23:59:59.000Z

84

Single-Point Closures in a Neutrally Stratified Boundary Layer  

Science Conference Proceedings (OSTI)

Closure assumptions often employed in single-point closure models for boundary-layer applications are evaluated against a neutrally stratified planetary boundary-layer flow generated by large-eddy simulation. The contributions from slow and rapid ...

Anders Andrén; Chin-Hoh Moeng

1993-10-01T23:59:59.000Z

85

Autumnal Mixed-Phase Cloudy Boundary Layers in the Arctic  

Science Conference Proceedings (OSTI)

Two mixed-phase cloudy boundary layer events observed over the Arctic ice pack in autumn are extensively analyzed. The local dynamic and thermodynamic structure of the boundary layers is determined from aircraft measurements including analysis of ...

James O. Pinto

1998-06-01T23:59:59.000Z

86

The Role of Boundary Layer Processes in Limiting PV Homogenization  

Science Conference Proceedings (OSTI)

A ?-plane multilevel quasigeostrophic channel model with interactive static stability and a simplified parameterization of atmospheric boundary layer physics is used to study the role of different boundary layer processes in eddy equilibration ...

Yang Zhang; Peter H. Stone; Amy Solomon

2009-06-01T23:59:59.000Z

87

BLIPS: A System for Studying Benthic Boundary Layer Dynamics  

Science Conference Proceedings (OSTI)

A Boundary Layer Interaction Profiting System (BLIPS) has been developed to measure kinematic quantities necessary for verification of theoretical, two-phase boundary layer flow models. BLIPS sensors include electromagnetic current meters, ...

Charles E. Adams Jr.; Winfield Hill; Rodney Fredericks

1990-10-01T23:59:59.000Z

88

Seasonal Simulations of the Planetary Boundary Layer and Boundary-Layer Stratocumulus Clouds with a General Circulation Model  

Science Conference Proceedings (OSTI)

The UCLA general circulation model (GCM) has been used to simulate the seasonally varying planetary boundary layer (PBL), as well as boundary-layer stratus and stratocumulus clouds. The PBL depth is a prognostic variable of the GCM, incorporated ...

David A. Randall; James A. Abeles; Thomas G. Corsetti

1985-04-01T23:59:59.000Z

89

The minisodar and planetary boundary layer studies  

SciTech Connect

The minisodar, in addition to being smaller than conventional sodar, operates at higher frequencies, obtains usable signal returns closer to the surface, and can use smaller range gates. Because the max range is generally limited to the lower 200 m above the surface, the minisodar is not able to interrogate the entire daytime atmospheric Planetary Boundary Layer (PBL); however it can be a very useful tool for understanding the PBL. In concert with other instruments, the minisodar can add significant new insights to our understanding of the PBL. This paper gives examples of past and potential uses of minisodars in such situations.

Coulter, R.L.

1996-06-01T23:59:59.000Z

90

Soot profiles in boundary-layer flames  

DOE Green Energy (OSTI)

Carbon particulate volume fractions and approximate particle size distributions are measured in a free laminar combusting boundary layer for liquid hydrocarbon fuels (n-heptane, iso-octane, cyclohexane, cyclohexene, toluene) and polymethylmethacrylate (PMMA). A multiwavelength laser transmission technique determines a most probable radius and the total particle concentration, which are two parameters in an assumed form for the size distribution. In the combusting boundary layer, a sooting region exists between the pyrolyzing fuel surface and the flame zone. The liquid fuel soot volume fractions, f/sub v/, range from f/sub v/ approx. 10/sup -7/ for n-heptane, a paraffin, to f/sub v approx. 10/sup -5/ for toluene, an aromatic. The PMMA volume fractions, f/sub v/ approx. 5 X 10/sup -7/, are approximately the same as the values previously reported for pool fires. The soot volume fractions increase with height; convection of carbon particles downstream widens the soot region with height. For all fuels tested, the most probable radius is between 20 nm and 50 nm, and it changes only slightly with height and distance from the fuel surface.

Beier, R.A.; Pagni, P.J.

1981-12-01T23:59:59.000Z

91

ARM - Field Campaign - Lower Atmospheric Boundary Layer Experiment  

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

govCampaignsLower Atmospheric Boundary Layer Experiment govCampaignsLower Atmospheric Boundary Layer Experiment Campaign Links LABLE Website Related Campaigns 2013 Lower Atmospheric Boundary Layer Experiment 2013.05.28, Turner, SGP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Lower Atmospheric Boundary Layer Experiment 2012.09.17 - 2012.11.13 Lead Scientist : David Turner Description Boundary layer turbulence is an important process that is parameterized in most atmospheric numerical models. Turbulence redistributes energy and mass within the boundary layer. Many different characteristics can impact the character of turbulence in the boundary layer, including different surface types, horizontal wind speed and direction, and the vertical temperature structure of the atmosphere. However, there have been few studies that have

92

Model of Trace Gas Flux in Boundary Layer  

E-Print Network (OSTI)

Mathematical model of the turbulent flux in the three-layer boundary system is presented. Turbulence is described as a presence of the nonzero vorticity. Generalized advection-diffusion-reaction equation is derived for arbitrary number components in the flux. The fluxes in the layers are objects for matching requirements on the boundaries between the layers.

I. I. Vasenev; I. S. Nurgaliev

2013-03-04T23:59:59.000Z

93

Wind and Temperature Profiles in the Radix Layer: The Bottom Fifth of the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

In the middle of the convective atmospheric boundary layer is often a deep layer of vertically uniform wind speed (MUL), wind direction, and potential temperature (?UL). A radix layer is identified as the whole region below this uniform layer, ...

Edi Santoso; Roland Stull

1998-06-01T23:59:59.000Z

94

A Rate Equation for the Nocturnal Boundary-Layer Height  

Science Conference Proceedings (OSTI)

A rate equation is derived which describes the development of the boundary-layer height under stable conditions as a function of time.

F. T. M. Nieuwstadt; H. Tennekes

1981-07-01T23:59:59.000Z

95

Boundary Layer Flame Spread over PMMA within the Initial ...  

Science Conference Proceedings (OSTI)

... INTRODUCTION Boundary layer-type flames are prevalent in wall fires, ceiling fires, and wind-driven fires on flat surfaces such as floors and roofs. ...

2011-11-03T23:59:59.000Z

96

A “Balanced” Approach to Stable Boundary Layer Dynamics  

Science Conference Proceedings (OSTI)

Semiempirical arguments from Roach and Nieuwstadt concerning Richardson numbers Ri, Rf in stably stratified shear layers and boundary layers appear to bypass uncertainties of turbulence closures. Here it is shown that these arguments can be ...

S. H. Derbyshire

1994-12-01T23:59:59.000Z

97

Boundary Layer Clouds and Vegetation–Atmosphere Feedbacks  

Science Conference Proceedings (OSTI)

An analysis of boundary layer cumulus clouds and their impact on land surface–atmosphere exchange is presented. Seasonal trends indicate that in response to increasing insolation and sensible heat flux, both the mixed-layer height (zi) and the ...

Jeffrey M. Freedman; David R. Fitzjarrald; Kathleen E. Moore; Ricardo K. Sakai

2001-01-01T23:59:59.000Z

98

A Theory of Gravity Wave Absorption by a Boundary Layer  

Science Conference Proceedings (OSTI)

A one-layer model of the atmospheric boundary layer (BL) is proposed to explain the nature of lee-wave attenuation and gravity wave absorption seen in numerical simulations. Two complex coefficients are defined: the compliance coefficient and the ...

Ronald B. Smith; Qingfang Jiang; James D. Doyle

2006-02-01T23:59:59.000Z

99

Supercritical Marine-Layer Flow along a Smoothly Varying Coastline  

Science Conference Proceedings (OSTI)

A model for hydraulically supercritical atmospheric marine-layer flow along a smoothly varying coastline is formulated and solved numerically. The model is motivated by a recent comparison of CODE observations to a simple hydraulic theory, which ...

R. M. Samelson

1992-09-01T23:59:59.000Z

100

Vertical Structure of the Tropical Boundary Layer  

Science Conference Proceedings (OSTI)

Obsemations presented show that the undisturbed subcloud layer near the ITCZ resembles that of the trades. Mixed and transition layers are also seen between cloud drafts during disturbed periods when shallow mixed layers (200 m) can persist for ...

Dayid R. Fitzjarrald; Michael Garstang

1981-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Marine Stratocumulus Layers. Part II: Turbulence Budgets  

Science Conference Proceedings (OSTI)

This paper discusses the turbulence profiles and budgets for two days of radiation, dynamical and thermodynamical observations by the NCAR Electra in shallow marine stratocumulus off the California coast in June 1976.

R. A. Brost; J. C. Wyngaard; D. H. Lenschow

1982-04-01T23:59:59.000Z

102

Dusty boundary layer in a surface-burst explosion  

SciTech Connect

Dusty boundary layers are an inherent feature of explosions over ground surfaces. Detailed knowledge of dusty boundary layer characteristics is needed in explosion safety analysis (e.g., to calculate the drag loads on structures). Also, to predicct the amount of dust in the rising fireball of an explsion, one must know the dusty boundary layer swept up during the positive and negative phases of the blast wave and how much of this boundary layer dust is entrained into the stem of the dust cloud. This paper describes the results of numerical simulations of the dusty boundary layer created by a surface burst explosion. The evolution of the flow was calculated by a high-order Godunov code that solves the nonsteady conservation laws.

Kuhl, A.L. [Lawrence Livermore National Lab., El Segundo, CA (United States); Ferguson, R.E.; Chien, K.Y.; Collins, J.P. [Naval Surface Warfare Center, Silver Spring, MD (United States)

1993-08-01T23:59:59.000Z

103

Convective Boundary Layers Driven by Nonstationary Surface Heat Fluxes  

Science Conference Proceedings (OSTI)

In this study the response of dry convective boundary layers to nonstationary surface heat fluxes is systematically investigated. This is relevant not only during sunset and sunrise but also, for example, when clouds modulate incoming solar ...

Robert van Driel; Harm J. J. Jonker

2011-04-01T23:59:59.000Z

104

Composite Structure of Plumes in Stratus-topped Boundary Layers  

Science Conference Proceedings (OSTI)

Knowledge of convective plumes within the clear convective boundary layer (CBL) is quite advanced owing to direct measurements, tank experiments, and large-eddy simulation studies. As a result, modeling of the CBL is relatively successful. ...

Chin-Hoh Moeng; Ulrich Schumann

1991-10-01T23:59:59.000Z

105

Measurements of Boundary Layer Profiles in an Urban Environment  

Science Conference Proceedings (OSTI)

Boundary layer profiles of mean temperature, velocity, and small-scale turbulence from in situ sensors, Doppler lidar, sodar, and rawinsondes are intercompared for an urban environment. A new Doppler lidar algorithm is presented to produce high-...

Rod Frehlich; Yannick Meillier; Michael L. Jensen; Ben Balsley; Robert Sharman

2006-06-01T23:59:59.000Z

106

Multiscale Large Eddy States in Weakly Stratified Planetary Boundary Layers  

Science Conference Proceedings (OSTI)

We first discuss observations of two classes of two-dimensional large eddy states in weakly stratified atmospheric boundary layers. One class is characterized by large eddies with a single horizontal scale. The other contains multiscale large ...

Pierre D. Mourad; Robert A. Brown

1990-02-01T23:59:59.000Z

107

Dispersion of Small Suspended Particles in a Wave Boundary Layer  

Science Conference Proceedings (OSTI)

The dispersion of heavy suspensions in a wave boundary layer over a nonerodible bed is examined theoretically. Focusing attention on the horizontal variation of the ambient wave pattern, an effective convection-diffusion equation is derived by ...

Chiang C. Mei; Chimin Chian

1994-12-01T23:59:59.000Z

108

Boundary-layer updrafts driven by airflow over heated terrain  

Science Conference Proceedings (OSTI)

This study presents linear and nonlinear scalings for boundary-layer ascent forced by airflow over heated terrain and compares them to results from corresponding high-resolution numerical simulations. Close agreement between theory and simulation ...

Daniel J. Kirshbaum; Chun-Chih Wang

109

Toward Convective Boundary Layer Parameterization: A Scalar Transport Module  

Science Conference Proceedings (OSTI)

Recent results from large-eddy simulations indicate that the eddy diffusivity for scalar diffusion through the top of a convective boundary layer is different from that for diffusion through the bottom. From this, one can show that the eddy ...

John C. Wyngaard

1984-06-01T23:59:59.000Z

110

Boundary Layer Oscillations from Thunderstorms at Sydney Airport  

Science Conference Proceedings (OSTI)

Analyses of wind velocity and air pressure data, acquired by a set of low-level anemometers at Sydney Airport, Australia, indicate the passage of a set of three remarkably smooth atmospheric boundary layer oscillations that traveled ahead of a ...

Richard Manasseh; Jason H. Middleton

1995-04-01T23:59:59.000Z

111

The Surface Boundary Layer in Coastal Upwelling Regions  

Science Conference Proceedings (OSTI)

Observations from the Oregon, northwest Africa, Peru, and northern California shelves are used to examine the characteristics of the surface boundary layer in coastal regions during the upwelling season. The observations from these four regions ...

Steven J. Lentz

1992-12-01T23:59:59.000Z

112

Observed Diurnal Cycle Climatology of Planetary Boundary Layer Height  

Science Conference Proceedings (OSTI)

An observational climatology of the planetary boundary layer height (PBLH) diurnal cycle, specific to surface characteristics, is derived from 58 286 fine-resolution soundings collected in 14 major field campaigns around the world. An objective ...

Shuyan Liu; Xin-Zhong Liang

2010-11-01T23:59:59.000Z

113

Gust Structure in the Neutral Surface Boundary Layer  

Science Conference Proceedings (OSTI)

Measured characteristics of gust amplitudes and times in the neutral surface boundary layer are presented. The probability of gust amplitudes exceeding a prescribed level is shown to decrease exponentially with amplitude, provided the amplitude ...

J. C. Doran; D. C. Powell

1982-01-01T23:59:59.000Z

114

Some Turbulence Characteristics in Stable Atmospheric Boundary Layer Flow  

Science Conference Proceedings (OSTI)

Atmospheric boundary layer measurements during stable and near neutral condition from seven sites in different kinds of terrain have been analyzed in order to find relationships among turbulence parameters.

Ann-Sofi Smedman

1991-03-01T23:59:59.000Z

115

Dynamical Modeling of Flow in Cumulus-Filled Boundary Layers  

Science Conference Proceedings (OSTI)

A primitive equation planetary boundary layer (PBL) model is constructed and applied to simulate the downwind evolution of coupled dynamic, thermodynamic and cloud properties in the PBL over warmer mean. A multilayered approach is adopted to ...

Chiu-Wai Yuen

1985-01-01T23:59:59.000Z

116

Daytime Evolution of Relative Humidity at the Boundary Layer Top  

Science Conference Proceedings (OSTI)

Data from the Hydrological and Atmospheric Pilot Experiment-Modélisation du Bilan Hydrigue (HAPEX-MOBILHY) field program and results from a one-dimensional model of the soil and atmospheric boundary layer are analyzed to study the daytime ...

M. Ek; L. Mahrt

1994-12-01T23:59:59.000Z

117

Coastal Boundary Layer Characteristics during Summer Stratification in Lake Ontario  

Science Conference Proceedings (OSTI)

Simultaneous measurements of Eulerian and Lagrangian currents along the north shore of Lake Ontario are analyzed to provide the mean flow properties and horizontal turbulent exchange characteristics in the coastal boundary layer (CBL). The summer ...

Y. R. Rao; C. R. Murthy

2001-04-01T23:59:59.000Z

118

Analytical Parameterizations of Diffusion: The Convective Boundary Layer  

Science Conference Proceedings (OSTI)

A brief review is made of data bases which have been used for developing diffusion parameterizations for the convective boundary layer (CBL). A variety of parameterizations for lateral and vertical dispersion, ?y and ?z, are surveyed; some of ...

Gary A. Briggs

1985-11-01T23:59:59.000Z

119

Nonlocal Treatment of the Buoyancy-Shear-Driven Boundary Layer  

Science Conference Proceedings (OSTI)

A successful description of a convective boundary layer requires that the model employed takes into account the nonlocal nature of turbulent convection. In this paper new third-order moments (TOMs) are presented and tested. Numerical solutions ...

E. Ferrero; N. Colonna

2006-10-01T23:59:59.000Z

120

Observations of Vertical Wind Shear Heterogeneity in Convective Boundary Layers  

Science Conference Proceedings (OSTI)

Dual-Doppler wind syntheses from mobile radar observations obtained during the International H2O Project document some of the spatial variability of vertical wind profiles in convective boundary layers. Much of the variability of popular ...

Paul Markowski; Yvette Richardson

2007-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

A Second-Order Bulk Boundary-Layer Model  

Science Conference Proceedings (OSTI)

Bulk mass-flux models represent the large eddies that are primarily responsible for the turbulent fluxes in the planetary boundary layer as convective circulations, with an associated convective mass flux. In order for such models to be useful, ...

David A. Randall; Qingqiu Shao; Chin-Hoh Moeng

1992-10-01T23:59:59.000Z

122

Spectral Characteristics of the Convective Boundary Layer Over Uneven Terrain  

Science Conference Proceedings (OSTI)

The paper describes a convective boundary layer experiment conducted in April 1978 at the Boulder Atmospheric Observatory, and examines the spectral behavior of wind velocity and temperature from the Observatory's 300 m tower, from aircraft ...

J. C. Kaimal; R. A. Eversole; D. H. Lenschow; B. B. Stankov; P. H. Kahn; J. A. Businger

1982-05-01T23:59:59.000Z

123

Boundary Layer Characteristics over Areas of Inhomogeneous Surface Fluxes  

Science Conference Proceedings (OSTI)

This paper describes results from a June 1992 field program to study the response of the boundary layer over a site with well-defined extreme differences in sensible and latent heat fluxes over clearly separated areas, each with characteristic ...

J. C. Doran; W. J. Shaw; J. M. Hubbe

1995-02-01T23:59:59.000Z

124

Sensitivity of Boundary-layer and Deep Convective Cloud Simulations...  

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

convective clouds using a cloud resolving model (CRM). A CRM usually uses a vertical grid spacing less than 100 m to simulate boundary layer clouds such as shallow cumuli and...

125

Estuarine Boundary Layer Mixing Processes: Insights from Dye Experiments  

Science Conference Proceedings (OSTI)

A series of dye releases in the Hudson River estuary elucidated diapycnal mixing rates and temporal variability over tidal and fortnightly time scales. Dye was injected in the bottom boundary layer for each of four releases during different ...

Robert J. Chant; Wayne R. Geyer; Robert Houghton; Elias Hunter; James Lerczak

2007-07-01T23:59:59.000Z

126

Pseudospectral Technique for Calculation of Atmospheric Boundary Layer Flows  

Science Conference Proceedings (OSTI)

A pseudospectral method and its numerical solution algorithm for application to boundary layer problems in the atmosphere are presented. The method introduces the evaluation of a polynomial function when the solution is expressed as the sum of a ...

H. N. Lee; J. K. Shi

1986-11-01T23:59:59.000Z

127

Intermittent and Elliptical Inertial Oscillations in the Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

As a convective boundary layer over land decays in the late afternoon, the atmosphere responds to the release of turbulent stresses. For many years, this response has been presumed to take the form of an inertial oscillation, a horizontal ...

Julie K. Lundquist

2003-11-01T23:59:59.000Z

128

Benthic Boundary-Layer Velocity Profiles: Dependence on Averaging Period  

Science Conference Proceedings (OSTI)

The relationship between benthic boundary-layer velocity profiles and current meter averaging time is investigated using detailed (0.61 Hz) current measurements recorded within 1 m of the bottom on the inner continental shelf. The percentage of ...

Barry M. Lesht

1980-06-01T23:59:59.000Z

129

Drizzle in Stratiform Boundary Layer Clouds. Part II: Microphysical Aspects  

Science Conference Proceedings (OSTI)

This is the second of two observational papers examining drizzle in stratiform boundary layer clouds. Part I details the vertical and horizontal structure of cloud and drizzle parameters, including some bulk microphysical variables. In this paper,...

R. Wood

2005-09-01T23:59:59.000Z

130

Radiative Cooling Effects within and above the Nocturnal Boundary Layer  

Science Conference Proceedings (OSTI)

For representative tropospheric profiles of water vapor, CO2 and temperature we have calculated in situ longwave radiative flux divergence for use in a simplified second-order closure model of nocturnal boundary-layer evolution. The time ...

J. R. Garratt; R. A. Brost

1981-12-01T23:59:59.000Z

131

Large-Eddy Simulation of the Convective Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

Large-eddy simulations of a free convective atmospheric boundary layer with an overlying capping inversion are considered. Attention is given to the dependence of the results upon the various factors influencing the simulation: the subgrid model, ...

P. J. Mason

1989-06-01T23:59:59.000Z

132

The Temporal Behavior of the Atmospheric Boundary Layer in Israel  

Science Conference Proceedings (OSTI)

Upper-air measurements collected for three consecutive years (1987–89) from the Israel Meteorological Service permanent sounding site, in Beit-Dagan, Israel, enabled the temporal behavior of the atmospheric boundary layer over Israel to be ...

Uri Dayan; Jacob Rodnizki

1999-06-01T23:59:59.000Z

133

Lidar Observation of the Atmospheric Boundary Layer in Jerusalem  

Science Conference Proceedings (OSTI)

The temporal variation of the atmospheric boundary layer (ABL) over Jerusalem is accurately measured by means of a lidar system. The findings are explained and discussed based on the specific synoptic situation of typical summer days in the ...

Ram Hashmonay; Ariel Cohen; Uri Dayan

1991-08-01T23:59:59.000Z

134

Evolution of Nitrogen Oxide Chemistry in the Nocturnal Boundary Layer  

Science Conference Proceedings (OSTI)

The nocturnal cycle of nitrogen oxides in the atmospheric boundary layer is studied by means of a one-dimensional model. The model solves the conservation equations of momentum, entropy, total water content, and of five chemical species. The ...

S. Galmarini; P. G. Duynkerke; J. Vilà-Guerau de Arellano

1997-07-01T23:59:59.000Z

135

The Nocturnal Boundary Layer: Model Calculations Compared with Observations  

Science Conference Proceedings (OSTI)

The structure and evolution of the nocturnal boundary layer (NBL) is simulated using a model which includes the transfer of energy by radiation and turbulence. The radiation scheme is an accurate narrow band model which simulates the absorption ...

Stephen A. Tjemkes; Peter G. Duynkergke

1989-03-01T23:59:59.000Z

136

Dynamics and Boundary Layer Processes in Two Asian Cyclones  

Science Conference Proceedings (OSTI)

An explosive and nonexplosive cyclone that developed during March 1986 along the coast of Japan are analyzed to illustrate the possible interaction of moist baroclinic dynamics, boundary layer structure and surface heat and moisture fluxes in ...

Wendell A. Nuss; Shun I. Kamikawa

1990-03-01T23:59:59.000Z

137

Racoro Extended-Term Aircraft Observations of Boundary Layer Clouds  

Science Conference Proceedings (OSTI)

A first-of-a-kind, extended-term cloud aircraft campaign was conducted to obtain an in situ statistical characterization of continental boundary layer clouds needed to investigate cloud processes and refine retrieval algorithms. Coordinated by the ...

Andrew M. Vogelmann; Greg M. McFarquhar; John A. Ogren; David D. Turner; Jennifer M. Comstock; Graham Feingold; Charles N. Long; Haflidi H. Jonsson; Anthony Bucholtz; Don R. Collins; Glenn S. Diskin; Hermann Gerber; R. Paul Lawson; Roy K. Woods; Elisabeth Andrews; Hee-Jung Yang; J. Christine Chiu; Daniel Hartsock; John M. Hubbe; Chaomei Lo; Alexander Marshak; Justin W. Monroe; Sally A. McFarlane; Beat Schmid; Jason M. Tomlinson; Tami Toto

2012-06-01T23:59:59.000Z

138

Physical Processes within the Nocturnal Stratus-topped Boundary Layer  

Science Conference Proceedings (OSTI)

Within the stratus-topped boundary layer many physical processes are involved: longwave radiation cooling, entrainment, latent heating, surface heating, solar heating, drizzling, etc. How all processes combine to maintain the turbulence within ...

Chin-Hoh Moeng; Shaohua Shen; David A. Randall

1992-12-01T23:59:59.000Z

139

Convectively Driven Mixing in the Bottom Boundary Layer  

Science Conference Proceedings (OSTI)

Closely spaced vertical profiles through the bottom boundary layer over a sloping continental shelf during relaxation from coastal upwelling reveal structure that is consistent with convectively driven mixing. Parcels of fluid were observed ...

J. N. Moum; A. Perlin; J. M. Klymak; M. D. Levine; T. Boyd; P. M. Kosro

2004-10-01T23:59:59.000Z

140

The Layered Structure of the Winter Atmospheric Boundary Layer in the Interior of Alaska  

Science Conference Proceedings (OSTI)

The high-latitude winter atmospheric boundary layer of interior Alaska continually exhibits a complex layered structure as a result of extreme meteorological conditions. In this paper the occurrence of elevated inversions (EI), surface-based ...

John A. Mayfield; Gilberto J. Fochesatto

2013-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

PROVISIONAL AGENDA Forum on Modeling the Atmospheric Boundary Layer  

E-Print Network (OSTI)

turbulence, surface layer turbulence, surface heat and moisture representations, heterogenous sub-grid scale-0915 Coordinate System ­ Roger Pielke, Sr., Chair (generalized vertical coordinate, horizontal spatial grid (on your own) 1400-1545 Sub-Grid Scale Fluxes ­ Jon Mercurio, Chair (planetary boundary layer

142

Time Scales of the Trade Wind Boundary Layer Adjustment  

Science Conference Proceedings (OSTI)

The adjustment of the trade wind atmospheric boundary layer to an abrupt sea surface warming is investigated using a large-eddy simulation (LES) and two simple bulk models: a mixed-layer model (MLM), and a model based on the mixing-line hypothesis ...

Gilles Bellon; Bjorn Stevens

2013-04-01T23:59:59.000Z

143

A Parameter Study of Interactions Between Convective Clouds, the Convective Boundary Layer, and a Forested Surface  

Science Conference Proceedings (OSTI)

A numerical model was developed which included cloud parameterizations, a convective boundary layer, solar and longwave radiation, a soil layer and a parameterized forest layer. The model simulated the growth of the convective boundary layer and ...

Alfred J. Garrett

1982-08-01T23:59:59.000Z

144

ARM - Field Campaign - Boundary Layer CO2 Using CW Lidar  

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

govCampaignsBoundary Layer CO2 Using CW Lidar govCampaignsBoundary Layer CO2 Using CW Lidar Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Boundary Layer CO2 Using CW Lidar 2005.05.21 - 2005.05.24 Lead Scientist : Michael Dobbs Description Overflights Underway at ACRF Southern Great Plains Site (M.Dobbs/J.Liljegren) Science collaborators at ITT Industries and the National Aeronautics and Space Administration (NASA) Langley Research Center (LaRC) conducted flights over the Central Facility at ACRF's Southern Great Plains (SGP) site as part of the Climate Sources and Sink (CO2) Intensive Operational Period (IOP), using a CW lidar. The objective of the flights was to validate, by demonstration and comparison with SGP ground observations, the performance of the ITT system when used in conjunction with retrieval

145

A dual mass flux framework for boundary layer convection  

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

A dual mass flux framework for boundary layer convection A dual mass flux framework for boundary layer convection Neggers, Roel European Centre for Medium-range Weather Forecasts (ECMWF) Category: Modeling A new convective boundary layer scheme is presented that is currently being developed for the Integrated Forecasting System (IFS) of the European Centre for Medium-range Weather Forecasts (ECMWF). Part of the total turbulent flux is modeled through advective mass flux by multiple updrafts, initialized at the surface. Two groups of updrafts are explicitly represented; i) updrafts that never reach their lifting condensation level, and ii) updrafts that condensate and become cloudy. Key new ingredient is the flexibility of the associated updraft area fractions, as a function of model state. As a result, an extra degree of freedom is introduced in the

146

Properties and Parameterization of the Stable Boundary Layer over Moderate Topography  

Science Conference Proceedings (OSTI)

Numerical simulations are used to investigate the impact on the stable boundary layer of moderate topography (with hill heights in some cases comparable to the undisturbed boundary layer depth). Area-averaged properties of the resulting boundary ...

A. R. Brown; N. Wood

2003-11-01T23:59:59.000Z

147

Absorption of Internal Waves by the Benthic Boundary Layer  

Science Conference Proceedings (OSTI)

The interaction of near-inertial velocities with the benthic boundary layer above a flat bottom is investigated using a diagnostic model and a 3-month time series of velocity from a fixed array of current meters. The observed near-inertial ...

Eric D'Asaro

1982-04-01T23:59:59.000Z

148

Thermally Indirect Motions in the Convective Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

The energetics of the dry convective boundary layer is studied by partitioning the turbulent heat flux into thermally indirect (w???thermally direct (w???>0) components as a function of z/Zi. It is found that except for the inversion ...

J. M. Wilczak; Joost A. Businger

1983-02-01T23:59:59.000Z

149

Numerical Simulation of Boundary Layer Variables Using ??? Closure Scheme  

Science Conference Proceedings (OSTI)

In this study, a one-and-a-half-order ??? closure scheme is used to study the planetary boundary layer development over a full diurnal cycle using Wangara 33d-day observations as initial conditions. The simulated results are compared with a first-...

N. Ramanathan; K. Srinivasan; B. V. Seshasayee

1995-02-01T23:59:59.000Z

150

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

151

Boundary Layer Parameterization for a Non-Gaussian Puff Model  

Science Conference Proceedings (OSTI)

The paper presents two boundary layer parameterizations for a model based on a general technique for solving the K equation using the truncated Gram–Charlier expansion (type A) of the concentration field and a finite set of equations for the ...

T. Tirabassi; U. Rizza

1997-08-01T23:59:59.000Z

152

Von Kármán's Constant in Atmospheric Boundary Layer Flow: Reevaluated  

Science Conference Proceedings (OSTI)

A field experiment has been carried out with the specific objective in mind to determine the value of von Kármán's constant in atmospheric boundary layer flow, and also to investigate its possible dependence on the surface Rossby number Ro0. Data ...

Ulf Högström

1985-02-01T23:59:59.000Z

153

Chaos and “Bursting” in the Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

A theoretical study of the intermittent breakdowns of the planetary boundary layer (PBL) has been carried out using a one-dimensional, “flat” terrain, PBL model of the type originally developed by A.K. Blackadar. It was found that the turbulent ...

Douglas O. ReVelle

1993-07-01T23:59:59.000Z

154

Influence of Soil Moisture on Boundary Layer Cloud Development  

Science Conference Proceedings (OSTI)

The daytime interaction of the land surface with the atmospheric boundary layer (ABL) is studied using a coupled one-dimensional (column) land surface–ABL model. This is an extension of earlier work that focused on modeling the ABL for 31 May ...

M. B. Ek; A. A. M. Holtslag

2004-02-01T23:59:59.000Z

155

Effects of mesoscale surface inhomogeneities on atmospheric boundary layer transfer  

SciTech Connect

Defining the nature of turbulent transfer over horizontally inhomogeneous surfaces remains one of the challenges in meteorology. Because the transfer of energy and momentum through the atmospheric boundary layer forms part of the lower boundary condition for global climate models (GCMs), the problem is important. Over the last two decades, advances in sensor and computer technology wave made good point measurements of turbulent fluxes fairly routine. A fundamental question with respect to climate models, however, is how such point measurements are related to average fluxes over the area of a GCM grid box. In this paper we will use data from the field program to depict the evolution of the boundary layer over adjacent, sharply contrasting surface types on two separate occasions. We will then use simple scaling based on the observations to argue that sub-gridscale motions would often be likely to significantly alter the estimates and resulting parameterizations of GCM-scale surface fluxes in the region.

Shaw, W.J.; Doran, J.C.; Hubbe, J.M.

1992-09-01T23:59:59.000Z

156

Microphysical Structure of the Marine Boundary Layer under Strong Wind and Spray Formation as Seen from Simulations Using a 2D Explicit Microphysical Model. Part II: The Role of Sea Spray  

Science Conference Proceedings (OSTI)

The effect of sea spray on the thermodynamics and microphysical structure of the lowest 400-m layer under strong wind speeds is investigated using a 2D hybrid Lagrangian–Eulerian model with spectral bin microphysics. A large number of adjacent and ...

J. Shpund; J. A. Zhang; M. Pinsky; A. Khain

2012-12-01T23:59:59.000Z

157

Application of a Perturbation Recycling Method in the Large-Eddy Simulation of a Mesoscale Convective Internal Boundary Layer  

Science Conference Proceedings (OSTI)

An arrangement of boundary conditions is described and demonstrated that facilitates the large-eddy simulation (LES) of inhomogeneous boundary layers such as internal boundary layers. In addition to the domain where the internal boundary layer ...

Shane D. Mayor; Philippe R. Spalart; Gregory J. Tripoli

2002-08-01T23:59:59.000Z

158

Influences on the Height of the Stable Boundary Layer as seen in Large-Eddy Simulations  

DOE Green Energy (OSTI)

Numerical weather prediction (NWP) models and atmospheric dispersion models rely on parameterizations of planetary boundary layer height. In the case of a stable boundary layer, errors in boundary layer height estimation can result in gross errors in boundary-layer evolution and in prediction of turbulent mixing within the boundary layer. We use large-eddy simulations (LES) of moderately stable boundary layers to characterize the effects of various physical processes on stable boundary layers. The stable boundary layer height is assumed to be a function of surface friction velocity, geostrophic wind, Monin-Obukhov length, and the strength of the temperature inversion atop the stable boundary layer. This temperature inversion induces gravity waves with a frequency determined by the strength of the temperature inversion.

Kosovic, B; Lundquist, J K

2004-03-29T23:59:59.000Z

159

Boundary Layer under Near-Inertial Internal Waves over a Critically Sloping Bottom  

Science Conference Proceedings (OSTI)

Internal waves reflecting off sloping bottoms have been shown to have boundary-layer scales proportional to ?½ (? is viscosity). As the characteristic slope of the wave approaches the slope of the bottom, the boundary-layer scale increases ...

R. Lee Gordon

1980-07-01T23:59:59.000Z

160

Aircraft Observations of Boundary Layer Rolls off the Coast of California  

Science Conference Proceedings (OSTI)

Large-scale horizontal rolls can have a significant influence on turbulent transport across the atmospheric boundary layer. The formation and maintenance of such rolls is dependent on the thermal and dynamic stability of the boundary layer (BL). ...

Ian M. Brooks; David P. Rogers

1997-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Turbulent Fluxes in the Hurricane Boundary Layer. Part II: Latent Heat Flux  

Science Conference Proceedings (OSTI)

As part of the recent ONR-sponsored Coupled Boundary Layer Air–Sea Transfer (CBLAST) Departmental Research Initiative, an aircraft was instrumented to carry out direct turbulent flux measurements in the high wind boundary layer of a hurricane. ...

William M. Drennan; Jun A. Zhang; Jeffrey R. French; Cyril McCormick; Peter G. Black

2007-04-01T23:59:59.000Z

162

An Equatorial Diffusive Boundary Layer and the Equatorial Stacked Jets in Thermally Driven OGCMs  

Science Conference Proceedings (OSTI)

New equatorial boundary layer solutions are found in a reduced-gravity model with large horizontal diffusivity. Analytical and semianalytical solutions are obtained and the structure of the boundary layer is discussed. The equatorial “stacked ...

Ryo Furue

2001-09-01T23:59:59.000Z

163

Observed Boundary Layer Wind Structure and Balance in the Hurricane Core. Part I: Hurricane Georges  

Science Conference Proceedings (OSTI)

The GPS dropsonde allows observations at unprecedentedly high horizontal and vertical resolution, and of very high accuracy, within the tropical cyclone boundary layer. These data are used to document the boundary layer wind field of the core of ...

Jeffrey D. Kepert

2006-09-01T23:59:59.000Z

164

Comparisons between Model Forecast and Observed Boundary Layer Profiles and Related Comments on Cloud Prediction  

Science Conference Proceedings (OSTI)

In this study comparisons are made between Met Office mesoscale model boundary layer profiles, and radiosonde data collected in the central United Kingdom during three intensive boundary layer cloud experiments. Significant differences between ...

J. D. Price; M. R. Bush

2004-12-01T23:59:59.000Z

165

Mesoscale Boundary Layer Evolution over Complex Terrain. Part I. Numerical Simulation of the Diurnal Cycle  

Science Conference Proceedings (OSTI)

The continuous development of a meso-?-scale boundary layer over sloping terrain upwind of a high mountain barrier was simulated through a complete diurnal cycle using a nonhydrostatic boundary-layer model. The simulation detailed the evolution ...

David C. Bader; Thomas B. McKee; Gregory J. Tripoli

1987-10-01T23:59:59.000Z

166

The Structure of Turbulence in the Near-neutral Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

In this paper, the idea of local similarity, previously used to study turbulence in the stably stratified boundary layer, is used to investigate the structure of turbulence in the neutral atmospheric boundary layer and to relate this structure to ...

A. L. M. Grant

1992-02-01T23:59:59.000Z

167

Boundary-Layer Transition across a Stratocumulus Cloud Edge in a Coastal Zone  

Science Conference Proceedings (OSTI)

We examine the lateral transition from a stratocumulus-covered boundary layer to a clear-sky convective boundary layer during onshore flow in a coastal environment, using both mobile sodar observations and a numerical model. During four ...

C. E. Skupniewicz; J. W. Glendening; R. F. Kamada

1991-10-01T23:59:59.000Z

168

Convective Boundary Layer Height Measurement with Wind Profilers and Comparison to Cloud Base  

Science Conference Proceedings (OSTI)

The depth of the atmospheric boundary layer is of interest in several different areas, such as chemistry, pollutant studies, and global modeling. In this research the authors describe and compare several different measurements of boundary layer ...

Alison W. Grimsdell; Wayne M. Angevine

1998-12-01T23:59:59.000Z

169

A Method for Coupling a Parameterization of the Planetary Boundary Layer with a Hydrologic Model  

Science Conference Proceedings (OSTI)

Deardorff's parameterization of the planetary boundary layer is adapted to drive a hydrologic model. The method converts the atmospheric conditions measured at the anemometer height at one site to the mean values in the planetary boundary layer ...

J. D. Lin; Shu Fen Sun

1986-12-01T23:59:59.000Z

170

Simulation of Atmospheric Boundary Layer Processes Using Local- and Nonlocal-Closure Schemes  

Science Conference Proceedings (OSTI)

A soil–vegetation–atmospheric boundary layer model was developed to study the performance of two local-closure and two nonlocal-closure boundary layer mixing schemes for use in meteorological and air quality simulation models. Full interaction ...

Kiran Alapaty; Jonathan E. Pleim; Sethu Raman; Devdutta S. Niyogi; Daewon W. Byun

1997-03-01T23:59:59.000Z

171

Spatial Variability of Atmospheric Boundary Layer Structure over the Eastern Equatorial Pacific  

Science Conference Proceedings (OSTI)

Variations in the atmospheric boundary layer structure over the eastern equatorial Pacific are analyzed using 916 soundings collected during the First Global Atmospheric Research Program Global Experiment. Unstable boundary layer structures are ...

Bingfan Yin; Bruce A. Albrecht

2000-05-01T23:59:59.000Z

172

Large-Eddy Simulation of a Stratus-Topped Boundary Layer. Part I: Structure and Budgets  

Science Conference Proceedings (OSTI)

The structure of a stratus-topped boundary layer is observed through large-eddy simulation which includes the interaction of longwave radiation and turbulence processes. This simulated boundary layer has a relatively warm and dry overlying ...

Chin-Hoh Moeng

1986-12-01T23:59:59.000Z

173

Use of Synthetic Data to Test Flight Patterns for a Boundary Layer Field Experiment  

Science Conference Proceedings (OSTI)

A virtual research aircraft was flown through a synthetic atmospheric boundary layer to help design a real flight plan that would allow robust turbulence statistics to be obtained in a heterogeneous, evolving, convective boundary layer. The ...

Edi Santoso; Roland Stull

1999-09-01T23:59:59.000Z

174

Turbulence Structure of the Hurricane Boundary Layer between the Outer Rainbands  

Science Conference Proceedings (OSTI)

As part of the Coupled Boundary Layers Air–Sea Transfer (CBLAST)-Hurricane program, flights were conducted to directly measure turbulent fluxes and turbulence properties in the high-wind boundary layer of hurricanes between the outer rainbands. ...

Jun A. Zhang; William M. Drennan; Peter G. Black; Jeffrey R. French

2009-08-01T23:59:59.000Z

175

Derivation of Turbulent Kinetic Energy from a First-Order Nonlocal Planetary Boundary Layer Parameterization  

Science Conference Proceedings (OSTI)

Turbulent kinetic energy (TKE) is derived from a first-order planetary boundary layer (PBL) parameterization for convective boundary layers: the nonlocal K-profile Yonsei University (YSU) PBL. A parameterization for the TKE equation is developed ...

Hyeyum Hailey Shin; Song-You Hong; Yign Noh; Jimy Dudhia

2013-06-01T23:59:59.000Z

176

A Case Study of the Morning Evolution of the Convective Boundary Layer Depth  

Science Conference Proceedings (OSTI)

Because of the importance of the convective boundary layer depth (CBLD) in determining pollutant concentrations near the surface, a study of the morning evolution of the convective boundary layer was carried out at the Central Nuclear de Almaraz, ...

José A. Garc; Mar L. Cancillo; José L. Cano

2002-10-01T23:59:59.000Z

177

Conserved Variable Analysis of the Convective Boundary Layer Thermodynamic Structure over the Tropical Oceans  

Science Conference Proceedings (OSTI)

An analysis of FGGE dropwindsonde data using conserved thermodynamic variables shows mixing line structures for the convective boundary layer over the equatorial Pacific. Deeper boundary layers show a double structure. Reversals of the gradients ...

Alan K. Betts; Bruce A. Albrecht

1987-01-01T23:59:59.000Z

178

Study of atmospheric boundary layer over Hong Kong using mobile micro-pulse lidar.  

E-Print Network (OSTI)

??Study of the boundary layer height, also known as the mixed layer height or mixing height, is of most importance to air pollution research and… (more)

Chan, Chiu Shing (???)

2005-01-01T23:59:59.000Z

179

Upward Momentum Transfer in the Marine Boundary Layer  

Science Conference Proceedings (OSTI)

This paper focuses on the study of momentum flux between ocean and atmosphere in light winds and is based on the data collected during several field campaigns, the Atlantic Stratocumulus Transition Experiment, the Tropical Ocean Global Atmosphere ...

A. A. Grachev; C. W. Fairall

2001-07-01T23:59:59.000Z

180

Observational Study of Marine Atmospheric Boundary Layer Characteristics during Swell  

Science Conference Proceedings (OSTI)

By combining simultaneous data from an instrumented Air–Sea Interaction Spar (ASIS) buoy and a 30-m tower, profiles of wind and turbulence characteristics have been obtained at several heights from about 1 to 30 m above the water surface during ...

A. Smedman; U. Högström; E. Sahleé; W. M. Drennan; K. K. Kahma; H. Pettersson; F. Zhang

2009-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Integrated Shipboard Measurements of the Marine Boundary Layer  

Science Conference Proceedings (OSTI)

The NOAA Environmental Technology Laboratory air–sea interaction group and collaborators at the Woods Hole Oceanographic Institution have developed a seagoing measurement system suitable for mounting aboard ships. During its development, it was ...

C. W. Fairall; A. B. White; J. B. Edson; J. E. Hare

1997-06-01T23:59:59.000Z

182

Defining Marine Boundary Layer Clouds with a Prognostic Scheme  

Science Conference Proceedings (OSTI)

A prognostic cloud scheme is described based on Tiedtke's cloud parameterization for large-scale meteorological models, which uses prognostic equations for both mean liquid water content and cloud fraction. The present work parameterizes the ...

Shouping Wang

1996-08-01T23:59:59.000Z

183

Low Cost Geothermal Separators BLISS Boundary Layer Inline Separator Scrubber  

DOE Green Energy (OSTI)

A new compact, low cost, and high performance separator is being developed to help reduce the installed and O and M cost of geothermal power generation. This device has been given the acronym ''BLISS'' that stands for ''Boundary Layer Inline Separator Scrubber''. The device is the first of a series of separators, and in the case of injectates, scrubbers to address the cost-reduction needs of the industry. The BLISS is a multi-positional centrifugal separator primarily designed to be simply installed between pipe supports, in a horizontal position. This lower profile reduces the height safety concern for workers, and significantly reduces the total installation cost. The vessel can demand as little as one-quarter (25%) the amount of steel traditionally required to fabricate many large vertical separators. The compact nature and high separating efficiency of this device are directly attributable to a high centrifugal force coupled with boundary layer control. The pseudo isokinetic flow design imparts a self-cleaning and scale resistant feature. This polishing separator is designed to remove moderate amounts of liquid and entrained solids.

Jung, Douglas; Wai, King

2000-05-26T23:59:59.000Z

184

Boundary layer structure over areas of heterogeneous heat fluxes  

SciTech Connect

In general circulation models (GCMs), some properties of a grid element are necessarily considered homogeneous. That is, for each grid volume there is associated a particular combination of boundary layer depth, vertical profiles of wind and temperature, surface fluxes of sensible and latent heat, etc. In reality, all of these quantities may exhibit significant spatial variations within the grid area, and the larger the area the greater the likely variations. In balancing the benefits of higher resolution against increased computational time and expense, it is useful to consider what the consequences of such subgrid-scale variability may be. Moveover, in interpreting the results of a simulation, one must be able to define an appropriate average value over a grid. There are two aspects of this latter problem: (1) in observations, how does one take a set of discrete or volume-averaged measurements and relate these to properties of the entire domain, and (2) in computations, how can subgrid-scale features be accounted for in the model parameterizations To address these and related issues, two field campaigns were carried out near Boardman, Oregon, in June 1991 and 1992. These campaigns were designed to measure the surface fluxes of latent and sensible heat over adjacent areas with strongly contrasting surface types and to measure the response of the boundary layer to those fluxes. This paper discuses some initial findings from those campaigns.

Doran, J.C. (Pacific Northwest Lab., Richland, WA (United States)); Barnes, F.J. (Los Alamos National Lab., NM (United States)); Coulter, R.L. (Argonne National Lab., IL (United States)); Crawford, T.L. (National Oceanic and Atmospheric Administration, Oak Ridge, TN (United States). Air Resources Lab. Atmospheric Turbulence and Diffusion Div.)

1993-01-01T23:59:59.000Z

185

Boundary layer structure over areas of heterogeneous heat fluxes  

SciTech Connect

In general circulation models (GCMs), some properties of a grid element are necessarily considered homogeneous. That is, for each grid volume there is associated a particular combination of boundary layer depth, vertical profiles of wind and temperature, surface fluxes of sensible and latent heat, etc. In reality, all of these quantities may exhibit significant spatial variations the grid area, and the larger the area the greater the likely variations. In balancing the benefits of higher resolution against increased computational time and expense, it is useful to consider what the consequences of such subgrid-scale variability may be. Moreover, in interpreting the results of a simulation, one must be able to define an appropriate average value over a grid. There are two aspects of this latter problem: (1) in observations, how does one take a set of discrete or volume-averaged measurements and relate these to properties of the entire domain, and (2) in computations, how can subgrid-scale features be accounted for in the model parameterizations? To address these and related issues, two field campaigns were carried out near Boardman, Oregon, in June 1991 and 1992. These campaigns were designed to measure the surface fluxes of latent and sensible heat over adjacent areas with strongly contrasting surface types and to measure the response of the boundary layer to those fluxes. This paper discusses some initial findings from those campaigns.

Doran, J.C. [Pacific Northwest Lab., Richland, WA (United States); Barnes, F.J. [Los Alamos National Lab., NM (United States); Coulter, R.L. [Argonne National Lab., IL (United States); Crawford, T.L. [National Oceanic and Atmospheric Administration, Oak Ridge, TN (United States). Air Resources Lab. Atmospheric Turbulence and Diffusion Div.

1993-01-01T23:59:59.000Z

186

Boundary layer structure over areas of heterogeneous heat fluxes  

SciTech Connect

In general circulation models (GCMs), some properties of a grid element are necessarily considered homogeneous. That is, for each grid volume there is associated a particular combination of boundary layer depth, vertical profiles of wind and temperature, surface fluxes of sensible and latent heat, etc. In reality, all of these quantities may exhibit significant spatial variations within the grid area, and the larger the area the greater the likely variations. In balancing the benefits of higher resolution against increased computational time and expense, it is useful to consider what the consequences of such subgrid-scale variability may be. Moveover, in interpreting the results of a simulation, one must be able to define an appropriate average value over a grid. There are two aspects of this latter problem: (1) in observations, how does one take a set of discrete or volume-averaged measurements and relate these to properties of the entire domain, and (2) in computations, how can subgrid-scale features be accounted for in the model parameterizations? To address these and related issues, two field campaigns were carried out near Boardman, Oregon, in June 1991 and 1992. These campaigns were designed to measure the surface fluxes of latent and sensible heat over adjacent areas with strongly contrasting surface types and to measure the response of the boundary layer to those fluxes. This paper discuses some initial findings from those campaigns.

Doran, J.C. [Pacific Northwest Lab., Richland, WA (United States); Barnes, F.J. [Los Alamos National Lab., NM (United States); Coulter, R.L. [Argonne National Lab., IL (United States); Crawford, T.L. [National Oceanic and Atmospheric Administration, Oak Ridge, TN (United States). Air Resources Lab. Atmospheric Turbulence and Diffusion Div.

1993-04-01T23:59:59.000Z

187

Boundary layer structure over areas of heterogeneous heat fluxes  

SciTech Connect

In general circulation models (GCMs), some properties of a grid element are necessarily considered homogeneous. That is, for each grid volume there is associated a particular combination of boundary layer depth, vertical profiles of wind and temperature, surface fluxes of sensible and latent heat, etc. In reality, all of these quantities may exhibit significant spatial variations the grid area, and the larger the area the greater the likely variations. In balancing the benefits of higher resolution against increased computational time and expense, it is useful to consider what the consequences of such subgrid-scale variability may be. Moreover, in interpreting the results of a simulation, one must be able to define an appropriate average value over a grid. There are two aspects of this latter problem: (1) in observations, how does one take a set of discrete or volume-averaged measurements and relate these to properties of the entire domain, and (2) in computations, how can subgrid-scale features be accounted for in the model parameterizations To address these and related issues, two field campaigns were carried out near Boardman, Oregon, in June 1991 and 1992. These campaigns were designed to measure the surface fluxes of latent and sensible heat over adjacent areas with strongly contrasting surface types and to measure the response of the boundary layer to those fluxes. This paper discusses some initial findings from those campaigns.

Doran, J.C. (Pacific Northwest Lab., Richland, WA (United States)); Barnes, F.J. (Los Alamos National Lab., NM (United States)); Coulter, R.L. (Argonne National Lab., IL (United States)); Crawford, T.L. (National Oceanic and Atmospheric Administration, Oak Ridge, TN (United States). Air Resources Lab. Atmospheric Turbulence and Diffusion Div.)

1993-01-01T23:59:59.000Z

188

Estimates of Surface Heat Flux from Sodar and Laser Scintillation Measurements in the Unstable Boundary Layer  

Science Conference Proceedings (OSTI)

Measurements of acoustic backscatter in the lower planetary boundary layer and optical line-of-sight scintillation in the surface layer are each used to compute sensible heat fluxes in the unstable surface layer. Comparisons with simultaneous low-...

R. L. Coulter; M. L. Wesely

1980-10-01T23:59:59.000Z

189

Study of Radiative and Turbulent Processes in the Stable Boundary Layer under Weak Wind Conditions  

Science Conference Proceedings (OSTI)

The role of radiation and turbulence was studied in a weak wind nocturnal inversion layer using a one-dimensional model. In contrast to a strong wind stable boundary layer where cooling within the surface inversion layer is dominated by ...

S. G. Gopalakrishnan; Maithili Sharan; R. T. McNider; M. P. Singh

1998-03-01T23:59:59.000Z

190

Boundary layer eddies at the Goodnoe Hills site  

DOE Green Energy (OSTI)

Data from nine instrumented meteorological towers at the MOD-2 wind turbine site at Goodnoe Hills in Washington State were analyzed to evaluate high-frequency perturbations, which were observed in the lower boundary-layer flow. Horizontal winds and temperature measurements for a period of 8 min, undisturbed by turbine operation, were available for this study. The data are in 1-s values from June 27, 1985. Throughout the study, departures from the mean for the period and for each sensor were used on area maps and on line-time and tower-time cross sections. Conventional streamline and isotach analyses were employed; they show highly organized flow fields with embedded perturbations traversing the site. Most of the flow fields have a well-developed vortical structure that reaches from the surface through the top level of the highest tower. These structures consist of a system of clockwise and counter-clockwise circulations. The wave length is about 500 to 600 m. Their wave speed is slightly greater than the mean wind speed and their movement is in the general direction of the mean flow. The results of the study show two main reasons why wind conditions and turbine power output in a wind farm may vary in a remarkable and abrupt fashion in space and time under certain circumstances: (1) The boundary-layer flow contains highly organized coherent perturbations with a typical size of 300 {times} 300 M{sup 2}. (2) The transition zones between the perturbations moving through a wind farm are associated with very definitive changes in the wind field that are on the order of meters and seconds. 2 refs., 11 figs.

Aspliden, C.I.; Wendell, L.L.; Clem, K.S.; Gower, G.L.

1991-05-01T23:59:59.000Z

191

Large eddy simultations of the atmospheric boundary layer east of the Colorado Rockies  

SciTech Connect

Large eddy simulation, LES, has often been carried out for the idealized situation of a simple convective boundary layer. Studies of dual Doppler radar and aircraft data from the Phoenix II experiment indicate that the boundary layer of the Colorado High Plains is not a purely convective boundary layer and it is influenced by the mountains to the west. The purpose of this study is to investigate the atmospheric boundary layer on one particular day on the Colorado High Plains. This research applies a LES nested within larger grids, which contain realistic topography and can simulate the larger-scale circulations initiated by the presence of the mountain barrier. How and to what extent the atmospheric boundary layer of the Colorado High Plains is influenced by larger scale circulations and other phenomena associated with the mountain barrier to the west is investigated. The nested grid LES reproduces the characteristics of the atmosphere for the case study day reasonably well. The mountains influence the atmospheric boundary layer over the plains to the east in several ways. The mountains contribute to the vertical shear of the horizontal winds through the thermally-induced mountain-plains circulation. As a consequence of the wind shear, the boundary layer that develops over the mountains is advected eastward over the top of the plains boundary layer, which is developing separately. This layer is marked by a mixture of gravity waves and turbulence and is atypical of a purely convective boundary layer. Just below this layer, the capping inversion of the plains boundary layer is weak and poorly defined compared to the inversions capping purely convective boundary layers. Gravity waves, triggered by the obstacle of the Rocky Mountains and by convection in the mountain boundary layer, also influence the atmosphere above the Colorado High Plains. These influences are found to have significant effects on the turbulence statistics and the energy spectra.

Costigan, K.R.; Cotton, W.R.

1992-10-22T23:59:59.000Z

192

A Two-Layer First-Order Closure Model for the Study of the Baroclinic Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

A steady-state two-layer model has been developed for the baroclinic boundary layer. The lower layer is the constant flux surface layer (SL) in which the eddy viscosity K varies with height and stability according to the Monin-Obukhov similarity ...

K. Krishna

1981-07-01T23:59:59.000Z

193

Ekman Pumping for Stratified Planetary Boundary Layers Adjacent to a Free Surface or Topography  

Science Conference Proceedings (OSTI)

In this paper, the classic Ekman pumping formulas for the vertical flow out of a boundary layer are generalized for both the layer above a rigid surface of variable slope and also for the boundary layer underneath a moving free surface. The ...

Benkui Tan

2000-10-01T23:59:59.000Z

194

Long-Term Observations of the Dynamics of the Continental Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

Time series of mixed layer depth, zi, and stable boundary layer height from March through October of 1998 are derived from a 915-MHz boundary layer profiling radar and CO2 mixing ratio measured from a 447-m tower in northern Wisconsin. Mixed ...

Chuixiang Yi; Kenneth J. Davis; Bradford W. Berger; Peter S. Bakwin

2001-05-01T23:59:59.000Z

195

Formation and Development of Nocturnal Boundary Layer Clouds over the Southern Great Plains  

Science Conference Proceedings (OSTI)

The formation and evolution of nocturnal boundary layer clouds over land are studied using a simple well-mixed boundary layer theory. By analyzing the deepening rate of the mixed layer depth based on the turbulent kinetic energy budget of the ...

Ping Zhu; Bruce Albrecht; Jon Gottschalck

2001-06-01T23:59:59.000Z

196

A Fractal Interfacial Entrainment Model for Dry Convective Boundary Layers. Part I: Model Description  

Science Conference Proceedings (OSTI)

An entrainment model for the convective planetary boundary layer is presented. It is based upon an ensemble-averaged view of the local entrainment interface that caps the convective mixed layer. Fractal and variational methods are used to ...

Ray F. Kamada

1988-09-01T23:59:59.000Z

197

Moisture Transport, Lower-Tropospheric Stability, and Decoupling of Cloud-Topped Boundary Layers  

Science Conference Proceedings (OSTI)

Decoupling during the “Lagrangian” evolution of a cloud-topped boundary layer advected equatorward by the trade winds in an idealized eastern subtropical ocean is studied using a mixed-layer model (MLM). The sea surface temperature is gradually ...

Christopher S. Bretherton; Matthew C. Wyant

1997-01-01T23:59:59.000Z

198

A Model for a Shear-Free Convective Boundary Layer with Parameterized Capping Inversion Structure  

Science Conference Proceedings (OSTI)

The paper extends Deardorff's general structure parameterization for a shear-free convective boundary layer. The model suggested employs the mixed layer hypothesis that the buoyancy (which is defined as b = g(?0 ? &rho)/?0, where ? is the density,...

E. E. Fedorovich; D. V. Mironov

1995-01-01T23:59:59.000Z

199

Similarity Equations for Wind and Temperature Profiles in the Radix Layer, at the Bottom of the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

In the middle of the convective boundary layer, also known as the mixed layer, is a relatively thick region where wind speed and potential temperature are nearly uniform with height. Below this uniform layer (UL), wind speed decreases to zero at ...

Edi Santoso; Roland Stull

2001-06-01T23:59:59.000Z

200

Numerical Simulation of Topographically Forced Mesoscale Variability in a Well-Mixed Marine Layer  

Science Conference Proceedings (OSTI)

A simple nonlinear numerical model of a well-mixed marine layer is used to study topographically forced mesoscale variability off coastal California. The model is used to simulate a persistent wind maximum observed near Point Conception during ...

Lee W. Eddington; J. J. O'brien; D. W. Stuart

1992-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Vertical Transports by Plumes within the Moderately Convective Marine Atmospheric Surface Layer  

Science Conference Proceedings (OSTI)

Bursts in the kinematic vertical transports of heat and horizontal momentum in a moderately convective marine atmospheric surface layer are studied by applying the variable interval time averaging (VITA) detection method to principal components ...

Richard A. Mason; Hampton N. Shirer; Robert Wells; George S. Young

2002-04-01T23:59:59.000Z

202

POTTY ET AL. Simulation of Boundary Layer Structure over the Indian Summer Monsoon Trough  

E-Print Network (OSTI)

POTTY ET AL. Simulation of Boundary Layer Structure over the Indian Summer Monsoon Trough during The planetary boundary layer (PBL) structure over the Indian summer monsoon trough region has been simulated using a regional numerical model during the passage of a monsoon depression along the monsoon trough

Raman, Sethu

203

Turbulent Fluxes in the Hurricane Boundary Layer. Part I: Momentum Flux  

Science Conference Proceedings (OSTI)

An important outcome from the ONR-sponsored Coupled Boundary Layer Air–Sea Transfer (CBLAST) Hurricane Program is the first-ever direct measurements of momentum flux from within hurricane boundary layers. In 2003, a specially instrumented NOAA P3 ...

Jeffrey R. French; William M. Drennan; Jun A. Zhang; Peter G. Black

2007-04-01T23:59:59.000Z

204

Boundary Layer and Mesoscale Structure over Lake Michigan during a Wintertime Cold Air Outbreak  

Science Conference Proceedings (OSTI)

An investigation of a cloud-topped boundary layer during a wintertime cold air outbreak over Lake Michigan has been conducted based on research aircraft 1 and 20 Hz data for five vertically-stacked levels within the boundary layer. Mean east-west ...

Ernest M. Agee; Mary L. Hart

1990-10-01T23:59:59.000Z

205

Numerical simulation of the shock wave / boundary layer interaction in a shock tube by  

E-Print Network (OSTI)

Numerical simulation of the shock wave / boundary layer interaction in a shock tube by using a high in a shock tube after the shock wave has reflected at the end wall. When the fluid is viscous, a complex unsteady interaction takes place between the reflected shock wave and the incident boundary layer

206

Shock-unsteadiness model applied to oblique shock wave/turbulent boundary-layer interaction  

Science Conference Proceedings (OSTI)

Reynolds-averaged Navier-Stokes prediction of shock wave/turbulent boundary layer interactions can yield significant error in terms of the size of the separation bubble. In many applications, this can alter the shock structure and the resulting surface ... Keywords: high-speed flows, separation bubble, shock-unsteadiness, turbulence modelling, turbulent boundary layer

Amjad Ali Pasha; Krishnendu Sinha

2008-09-01T23:59:59.000Z

207

A Boundary-Layer Model for Mars: Comparison with Viking Lander and Entry Data  

Science Conference Proceedings (OSTI)

A one-dimensional boundary-layer model for Mars is described, and its results are compared with Viking data. The model equations are similar to Earth boundary-layer models in that they include contributions from Coriolis, pressure gradient, and ...

Robert M. Haberle; Howard C. Houben; Rolf Hertenstein; Tomas Herdtle

1993-06-01T23:59:59.000Z

208

Crop Wind Energy Experiment (CWEX): Observations of Surface-Layer, Boundary Layer, and Mesoscale Interactions with a Wind Farm  

Science Conference Proceedings (OSTI)

Perturbations of mean and turbulent wind characteristics by large wind turbines modify fluxes between the vegetated surface and the lower boundary layer. While simulations have suggested that wind farms could significantly change surface fluxes of heat, ...

Daniel A. Rajewski; Eugene S. Takle; Julie K. Lundquist; Steven Oncley; John H. Prueger; Thomas W. Horst; Michael E. Rhodes; Richard Pfeiffer; Jerry L. Hatfield; Kristopher K. Spoth; Russell K. Doorenbos

2013-05-01T23:59:59.000Z

209

Boundary Layer Structure and Dynamics in Outer Hurricane Rainbands. Part II: Downdraft Modification and Mixed Layer Recovery  

Science Conference Proceedings (OSTI)

Recent aircraft boundary layer measurements in the vicinity of principal hurricane rainbands have confirmed that convective downdrafts are capable of transporting cool, dry, low equivalent potential temperature (?E) air to the surface, where the ...

Mark D. Powell

1990-04-01T23:59:59.000Z

210

Boundary Layer Dynamics and Cross-Equatorial Hadley Circulation  

Science Conference Proceedings (OSTI)

The behavior of the Hadley circulation is analyzed in the context of an idealized axisymmetric atmosphere. It is argued that the cross-equatorial Hadley circulation exhibits two different regimes depending on the depth of the planetary boundary ...

Olivier Pauluis

2004-05-01T23:59:59.000Z

211

Parameterization of Joint Frequency Distributions of Potential Temperature and Water Vapor Mixing Ratio in the Daytime Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Joint frequency distributions (JFDs) of potential temperature (?) versus water vapor mixing ratio (r) within the convective boundary layer were measured during a new field experiment named Boundary Layer Experiment 1996 (BLX96). These JFDs were ...

Larry K. Berg; Roland B. Stull

2004-04-01T23:59:59.000Z

212

PDF Parameterization of Boundary Layer Clouds in Models with Horizontal Grid Spacings from 2 to 16 km  

Science Conference Proceedings (OSTI)

Many present-day numerical weather prediction (NWP) models are run at resolutions that permit deep convection. In these models, however, the boundary layer turbulence and boundary layer cloud features are still grossly underresolved. ...

Vincent E. Larson; David P. Schanen; Minghuai Wang; Mikhail Ovchinnikov; Steven Ghan

2012-01-01T23:59:59.000Z

213

A Climatological Study of Internal Gravity Waves in the Atmospheric Boundary Layer Overlying the Brunt Ice Shelf, Antarctica  

Science Conference Proceedings (OSTI)

Internal gravity waves are frequently observed in stably stratified regions of the atmospheric boundary layer. In order to determine the statistical influence of such waves on the dynamics of the boundary layer it is necessary to compile ...

J. M. Rees; J. C. W. Denholm-Price; J. C. King; P. S. Anderson

2000-02-01T23:59:59.000Z

214

An Examination of Local versus Nonlocal Aspects of a TKE-Based Boundary Layer Scheme in Clear Convective Conditions  

Science Conference Proceedings (OSTI)

In this study, the ability of a turbulent kinetic energy (TKE)–based boundary layer scheme to reproduce the rapid evolution of the planetary boundary layer (PBL) observed during two clear convective days is examined together with the impact of ...

Stéphane Bélair; Jocelyn Mailhot; J. Walter Strapp; J. Ian MacPherson

1999-10-01T23:59:59.000Z

215

Baroclinic Adjustment in an Atmosphere–Ocean Thermally Coupled Model: The Role of the Boundary Layer Processes  

Science Conference Proceedings (OSTI)

Baroclinic eddy equilibration and the roles of different boundary layer processes in limiting the baroclinic adjustment are studied using an atmosphere–ocean thermally coupled model. Boundary layer processes not only affect the dynamical ...

Yang Zhang; Peter H. Stone

2011-11-01T23:59:59.000Z

216

Boundary Layer Energy Transport and Cumulus Development over a Heated Mountain: An Observational Study  

Science Conference Proceedings (OSTI)

Aircraft and surface measurements of the boundary layer transport of mass and moisture toward an isolated, heated mountain are presented. The data were collected around the Santa Catalina Mountains in Arizona, 20–30 km in diameter, during the ...

J. Cory Demko; Bart Geerts; Qun Miao; Joseph A. Zehnder

2009-01-01T23:59:59.000Z

217

Characteristics of the Near-Surface Boundary Layer within a Mountain Valley during Winter  

Science Conference Proceedings (OSTI)

Within mountainous regions, estimating the exchange of sensible heat and water vapor between the surface and the atmosphere is an important but inexact endeavor. Measurements of the turbulence characteristics of the near-surface boundary layer in ...

Warren Helgason; John W. Pomeroy

2012-03-01T23:59:59.000Z

218

A Simple Model for Pollution Dispersion in a Convective Boundary Layer  

Science Conference Proceedings (OSTI)

A simplified model for dispersion in a convective boundary layer is presented and is used to diagnose crosswind-integrated concentrations, ground-level concentrations, and vertical plume spread over flat terrain for various release heights. The ...

Roland Stull; Bruce Ainslie

2006-12-01T23:59:59.000Z

219

Mechanism of Heating and the Boundary Layer over the Tibetan Plateau  

Science Conference Proceedings (OSTI)

The structure of the boundary layer and the mechanism of heating over the Tibetan Plateau are examined using the data obtained from the First GARP (Global Atmospheric Research Program) Global Experiment and the Chinese Qinghai–Xizang (Tibet) ...

Michio Yanai; Chengfeng Li

1994-02-01T23:59:59.000Z

220

Large Eddy Simulation of an Inhomogeneous Atmospheric Boundary Layer under Neutral Conditions  

Science Conference Proceedings (OSTI)

Flow structures in an inhomogeneous neutrally stratified atmospheric boundary layer flow, obtained from large eddy simulation, are analyzed and compared with homogeneous case counterparts. The inhomogeneity is imposed in the streamwise direction ...

Ching-Long Lin; John W. Glendening

2002-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

A Combined Eddy-Diffusivity Mass-Flux Approach for the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

A better conceptual understanding and more realistic parameterizations of convective boundary layers in climate and weather prediction models have been major challenges in meteorological research. In particular, parameterizations of the dry ...

A. Pier Siebesma; Pedro M. M. Soares; João Teixeira

2007-04-01T23:59:59.000Z

222

Convective Evolution and Merger in the FACE Experimental Area: Mesoscale Convection and Boundary Layer Interactions  

Science Conference Proceedings (OSTI)

This paper investigates the interactions between the various scales of motion and, specifically, the inter-actions between convection and the surface boundary layer in the development of a mesoscale convective system within the Florida Area ...

John B. Cunning; Ronald L. Holle; Patrick T. Gannon; Andrew I. Watson

1982-07-01T23:59:59.000Z

223

An Approximate Footprint Model for Flux Measurements in the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

An explicit footprint model for flux measurements of passive scalars in the lower part of the convective boundary layer (CBL) is introduced. A simple footprint model is derived analytically in an idealized CBL. The simple model can simulate the ...

Weiguo Wang; Kenneth J. Davis; Daniel M. Ricciuto; Martha P. Butler

2006-10-01T23:59:59.000Z

224

Meteorological and Astronomical Influences on Radar Reflectivity in the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Observations are presented of time-varying radar reflectivity during a partial solar eclipse in Oklahoma. The measurements from a radar of 10-cm wavelength, were obtained in the clear-air boundary layer. The reflectivity changes closely follow ...

Robert M. Rabin; Richard J. Doviak

1989-11-01T23:59:59.000Z

225

Estimating the Orientation and Spacing of Midlatitude Linear Convective Boundary Layer Features: Cloud Streets  

Science Conference Proceedings (OSTI)

Linear features in a clear convective boundary layer (CBL) over the North Atlantic Ocean were studied during a weak cold air outbreak using a down-looking airborne lidar. Sequential lidar profiles were placed together and color coded to provide ...

S. H. Melfi; Stephen P. Palm

2012-01-01T23:59:59.000Z

226

A Model for the Turbulent Structure of the Stratocumulus–Topped Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

A multilevel ensemble-averaged model has been developed to study the cloud-topped atmospheric boundary layer (ABL). Turbulence closure is formulated by using an equation for the turbulent kinetic energy and either a diagnostic formulation of the ...

P. G. Duynkerke; A. G. M. Driedonks

1987-01-01T23:59:59.000Z

227

Exploring the Possible Role of Small-Scale Terrain Drag on Stable Boundary Layers over Land  

Science Conference Proceedings (OSTI)

This paper addresses the possible role of unresolved terrain drag, relative to the turbulent drag on the development of the stable atmospheric boundary layer over land. Adding a first-order estimate for terrain drag to the turbulent drag appears ...

G. J. Steeneveld; A. A. M. Holtslag; C. J. Nappo; B. J. H. van de Wiel; L. Mahrt

2008-10-01T23:59:59.000Z

228

Transient Evolution of Langmuir Turbulence in Ocean Boundary Layers Driven by Hurricane Winds and Waves  

Science Conference Proceedings (OSTI)

A large-eddy simulation (LES) model, which adopts wave-averaged equations with vortex force, is used to investigate Langmuir turbulence and ocean boundary layer (OBL) dynamics in high-wind hurricane conditions. The temporally evolving spatially ...

Peter P. Sullivan; Leonel Romero; James C. McWilliams; W. Kendall Melville

2012-11-01T23:59:59.000Z

229

A Modeling Study of the Effects of Inhomogeneous Surface Fluxes on Boundary-Layer Properties  

Science Conference Proceedings (OSTI)

A numerical modeling study was conducted to examine the response of the atmospheric boundary layer to inhomogeneous surface fluxes. The study was used to extend the results obtained from a field experiment carried out in spring 1992 in north-...

Shiyuan Zhong; J. C. Doran

1995-09-01T23:59:59.000Z

230

An Embedded Bottom Boundary Layer Formulation for Z-Coordinate Ocean Models  

Science Conference Proceedings (OSTI)

An embedded bottom boundary layer (EBBL) scheme is developed to improve the bottom topographic representation in z-coordinate ocean general circulation models. The EBBL scheme is based on the combined techniques of an embedded topography-...

Y. Tony Song; Yi Chao

2000-04-01T23:59:59.000Z

231

Wave Exchange between the Ground Surface and a Boundary-Layer Critical Level  

Science Conference Proceedings (OSTI)

Gravity waves induced by two- and three-dimensional terrain features are examined theoretically in the planetary boundary layer (PBL) using a linear wave model that includes reabsorption at a critical level. The PBL structure is characterized by ...

Carmen J. Nappo; George Chimonas

1992-07-01T23:59:59.000Z

232

Evaluation of Boundary Layer Similarity Theory for Stable Conditions in CASES-99  

Science Conference Proceedings (OSTI)

The Monin–Obukhov similarity theory and a generalized formulation of the mixing length for the stable boundary layer are evaluated using the Cooperative Atmosphere–Surface Exchange Study-1999 (CASES-99) data. The large-scale wind forcing is ...

Kyung-Ja Ha; Yu-Kyung Hyun; Hyun-Mi Oh; Kyung-Eak Kim; Larry Mahrt

2007-10-01T23:59:59.000Z

233

Advances in the visualization and analysis of boundary layer flow in swimming fish  

E-Print Network (OSTI)

In biology, the importance of fluid drag, diffusion, and heat transfer both internally and externally, suggest the boundary layer as an important subject of investigation, however, the complexities of biological systems ...

Anderson, Erik J

2005-01-01T23:59:59.000Z

234

Observations of Turbulence Mixing and Vorticity in a Littoral Surface Boundary Layer  

Science Conference Proceedings (OSTI)

Measurements of small-scale vorticity, turbulence velocity, and dissipation rates of turbulence kinetic energy ? were taken in a littoral fetch-limited surface wave boundary layer. Drifters deployed on the surface formed convergence streaks with ...

R-C. Lien; B. Sanford; W-T. Tsai

2008-03-01T23:59:59.000Z

235

Observations of Flow and Turbulence in the Nocturnal Boundary Layer over a Slope  

Science Conference Proceedings (OSTI)

Measurements were conducted on an eastern slope of the Salt Lake Basin (SLB) as a part of the Vertical Transport and Mixing Experiment (VTMX) conducted in October 2000. Of interest was the nocturnal boundary layer on a slope (in particular, ...

P. Monti; H. J. S. Fernando; M. Princevac; W. C. Chan; T. A. Kowalewski; E. R. Pardyjak

2002-09-01T23:59:59.000Z

236

An Investigation of the Development of Cumulonimbus Systems over South Florida. Part I: Boundary Layer Interactions  

Science Conference Proceedings (OSTI)

This paper investigates the interactions between two developing cumulonimbus systems and the boundary layer (surface winds, pressure, divergence and temperature fields) on a case study day, 25 August 1975. These two systems formed within 45 min ...

John B. Cunning; Mark Demaria

1986-01-01T23:59:59.000Z

237

Local Structure of the Convective Boundary Layer from a Volume-Imaging Radar  

Science Conference Proceedings (OSTI)

The local structure and evolution of the convective boundary layer (CBL) are studied through measurements obtained with a volume-imaging radar, the turbulent eddy profiler (TEP). TEP has the unique ability to image the temporal and spatial ...

Brian D. Pollard; Samir Khanna; Stephen J. Frasier; John C. Wyngaard; Dennis W. Thomson; Robert E. McIntosh

2000-07-01T23:59:59.000Z

238

Numerical Prediction of Submesoscale Flow in the Nocturnal Stable Boundary Layer over Complex Terrain  

Science Conference Proceedings (OSTI)

Numerical weather prediction models often perform poorly for weakly forced, highly variable winds in nocturnal stable boundary layers (SBLs). When used as input to air-quality and dispersion models, these wind errors can lead to large errors in ...

Nelson L. Seaman; Brian J. Gaudet; David R. Stauffer; Larry Mahrt; Scott J. Richardson; Jeffrey R. Zielonka; John C. Wyngaard

2012-03-01T23:59:59.000Z

239

Numerical Modeling of the Propagation Environment in the Atmospheric Boundary Layer over the Persian Gulf  

Science Conference Proceedings (OSTI)

Strong vertical gradients at the top of the atmospheric boundary layer affect the propagation of electromagnetic waves and can produce radar ducts. A three-dimensional, time-dependent, nonhydrostatic numerical model was used to simulate the ...

B. W. Atkinson; J-G. Li; R. S. Plant

2001-03-01T23:59:59.000Z

240

Control of Chemical Reactions by Convective Turbulence in the Boundary Layer  

Science Conference Proceedings (OSTI)

The influence of convective turbulence on chemical reactions in the atmospheric boundary layer is studied by means of direct numerical simulation (DNS). An archetype of turbulent reacting flows is used to study the reaction zones and to obtain a ...

M. Jeroen Molemaker; Jordi Vilà-Guerau de Arellano

1998-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Large Eddy Simulation of Internal Boundary Layers Created by a Change in Surface Roughness  

Science Conference Proceedings (OSTI)

Turbulence in a ?-mesoscale internal boundary layer (IBL) formed by a discontinuous change in surface roughness has been investigated using a large eddy simulation (LES) model to explicitly treat turbulent transport. Two cases are examined: a ...

John W. Glendening; Ching-Long Lin

2002-05-01T23:59:59.000Z

242

A Rate Equation for the Inversion Height in a Nocturnal Boundary Layer  

Science Conference Proceedings (OSTI)

The application of a self-similar profile in the integration of the temperature equation across the stable boundary layer leads to a rate equation for the inversion height. An analytic solution of the resulting equation is derived. Its behavior ...

F. T. M. Nieuwstadt

1980-12-01T23:59:59.000Z

243

An Analytical Method to Evaluate Mixing Length Scales for the Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

An analytical method to evaluate the Lagrangian length scales for a turbulent planetary boundary layer (PBL) under stable and convective conditions is described in this paper. The method is based on the Taylor's diffusion theory. Agreement with ...

G. A. Degrazia; O. L. L. Moraes; A. P. Oliveira

1996-06-01T23:59:59.000Z

244

Sensitivity of MM5-Simulated Boundary Layer Characteristics to Turbulence Parameterizations  

Science Conference Proceedings (OSTI)

The sensitivity of high-resolution mesoscale simulations to boundary layer turbulence parameterizations is investigated using the fifth-generation Pennsylvania State University–NCAR Mesoscale Model (MM5) and observations from two field campaigns. ...

Larry K. Berg; Shiyuan Zhong

2005-09-01T23:59:59.000Z

245

The Role of Longwave Radiation and Boundary Layer Thermodynamics in Forcing Tropical Surface Winds  

Science Conference Proceedings (OSTI)

This paper reveals major deficiencies of the existing intermediate climate models for tropical surface winds and elaborates the important roles of cloud-longwave radiational forcing and boundary layer thermodynamics in driving the tropical ...

Xiouhua Fu; Bin Wang

1999-04-01T23:59:59.000Z

246

Numerical Simulation of Transitions in Boundary Layer Convective Structures in a Lake-Effect Snow Event  

Science Conference Proceedings (OSTI)

Numerical simulations are used to study transitions between boundary layer rolls and more cellular convective structures observed during a lake-effect snow event over Lake Michigan on 17 December 1983. Weak lake-effect nonroll convection was ...

Kevin A. Cooper; Mark R. Hjelmfelt; Russell G. Derickson; David A. R. Kristovich; Neil F. Laird

2000-09-01T23:59:59.000Z

247

Wind Direction Dependence of Atmospheric Boundary Layer Turbulence Parameters in the Urban Roughness Sublayer  

Science Conference Proceedings (OSTI)

A variety of atmospheric boundary layer parameters are examined as a function of wind direction in both urban and suburban settings in Oklahoma City, Oklahoma, derived from measurements during the Joint Urban 2003 field campaign. Heterogeneous ...

Cheryl Klipp

2007-12-01T23:59:59.000Z

248

Deep convection triggering by boundary layer thermals. Part 1: LES analysis and stochastic triggering formulation  

Science Conference Proceedings (OSTI)

This paper proposes a new formulation of the deep convection triggering for GCM (General Circulation Model) convective parameterizations. This triggering is driven by evolving properties of the strongest boundary-layer thermals. To investigate ...

Nicolas Rochetin; Fleur Couvreux; Jean-Yves Grandpeix; Catherine Rio

249

Parameterization of the Dry Convective Boundary Layer Based on a Mass Flux Representation of Thermals  

Science Conference Proceedings (OSTI)

Presented is a mass flux parameterization of vertical transport in the convective boundary layer. The formulation of the new parameterization is based on an idealization of thermal cells or rolls. The parameterization is validated by comparison ...

Frédéric Hourdin; Fleur Couvreux; Laurent Menut

2002-03-01T23:59:59.000Z

250

Heat Energy Balance in the Convective Atmospheric Boundary Layer at Xianghe (Beijing Area), China  

Science Conference Proceedings (OSTI)

A simple and physically consistent expression for the turbulent heat flux equation in the convective atmospheric boundary layer (CABL) has been suggested by Holtslag and Moeng in 1991. In their equation, valid under quasi-steady states and ...

M. W. Qian; A. Longhetto; C. Cassardo; C. Giraud; Z. X. Hong; W. D. Luo; Y. J. Zhao

2000-12-01T23:59:59.000Z

251

Dynamics of Sheared Convective Boundary Layer Entrainment. Part I: Methodological Background and Large-Eddy Simulations  

Science Conference Proceedings (OSTI)

The reported study examines the dynamics of entrainment and its effects on the evolution of the dry atmospheric convective boundary layer (CBL) when wind shear is present. The sheared CBL can be studied by means of direct measurements in the ...

Robert J. Conzemius; Evgeni Fedorovich

2006-04-01T23:59:59.000Z

252

Large-Eddy Simulation of the Stable Boundary Layer with Explicit Filtering and Reconstruction Turbulence Modeling  

Science Conference Proceedings (OSTI)

Large-eddy simulation (LES) of the stably stratified atmospheric boundary layer is performed using an explicit filtering and reconstruction approach with a finite difference method. Turbulent stresses are split into the resolvable subfilter-scale ...

Bowen Zhou; Fotini Katopodes Chow

2011-09-01T23:59:59.000Z

253

Boundary Layer Dynamics in a Simple Model for Convectively Coupled Gravity Waves  

Science Conference Proceedings (OSTI)

A simplified model of intermediate complexity for convectively coupled gravity waves that incorporates the bulk dynamics of the atmospheric boundary layer is developed and analyzed. The model comprises equations for velocity, potential ...

Michael L. Waite; Boualem Khouider

2009-09-01T23:59:59.000Z

254

Observed Boundary Layer Wind Structure and Balance in the Hurricane Core. Part II: Hurricane Mitch  

Science Conference Proceedings (OSTI)

Part I of this paper presented a detailed analysis of the boundary layer of Hurricane Georges (1998), based mainly on the newly available high-resolution GPS dropsonde data. Here, similar techniques and data are used to study Hurricane Mitch (...

Jeffrey D. Kepert

2006-09-01T23:59:59.000Z

255

Asymmetric Hurricane Boundary Layer Structure from Dropsonde Composites in Relation to the Environmental Vertical Wind Shear  

Science Conference Proceedings (OSTI)

This study investigates the asymmetric structure of the hurricane boundary layer in relation to the environmental vertical wind shear in the inner core region. Data from 1878 GPS dropsondes deployed by research aircraft in 19 hurricanes are ...

Jun A. Zhang; Robert F. Rogers; Paul D. Reasor; Eric W. Uhlhorn; Frank D. Marks Jr.

2013-11-01T23:59:59.000Z

256

The Boundary Layer Winds in Hurricanes Danielle (1998) and Isabel (2003)  

Science Conference Proceedings (OSTI)

This paper describes the boundary layer wind structure and dynamics of Hurricanes Danielle (1998) and Isabel (2003), based on the analysis of high-resolution global positioning system dropwindsonde data and simulation of the flow by a three-...

Juliane Schwendike; Jeffrey D. Kepert

2008-08-01T23:59:59.000Z

257

An Observational Case for the Prevalence of Roll Vortices in the Hurricane Boundary Layer  

Science Conference Proceedings (OSTI)

Doppler velocity data from Weather Surveillance Radar-1988 Doppler (WSR-88D) radars during four hurricane landfalls are analyzed to investigate the presence of organized vortices in the hurricane boundary layer (HBL). The wavelength, depth, ...

Ian Morrison; Steven Businger; Frank Marks; Peter Dodge; Joost A. Businger

2005-08-01T23:59:59.000Z

258

Parameterization of Surface Heat Fluxes above Forest with Satellite Thermal Sensing and Boundary-Layer Soundings  

Science Conference Proceedings (OSTI)

Satellite-derived surface temperature measurements can be used in conjunction with temperature and wind soundings in the boundary layer to determine the surface sensible heat flux from forests at the regional scale. The underlying formulation is ...

Wilfried Brutsaert; A. Y. Hsu; Thomas J. Schmugge

1993-05-01T23:59:59.000Z

259

Leeside Boundary Layer Confluence and Afternoon Thunderstorms over Mayaguez, Puerto Rico  

Science Conference Proceedings (OSTI)

The midsummer boundary layer (BL) circulation and afternoon thunderstorm convection on the lee side of Puerto Rico is studied using observations and high-resolution models. Satellite infrared data help to identify cases on 5 and 14 June 2010 when ...

Mark R. Jury; Sen Chiao

2013-02-01T23:59:59.000Z

260

Climatic Equilibrium of the Atmospheric Convective Boundary Layer over a Tropical Ocean  

Science Conference Proceedings (OSTI)

A one-dimensional thermodynamic model for a partially mixed, partly cloudy, convective boundary layer (CBL) is coupled to a radiation model to compute equilibrium solutions for a tropical CBL and troposphere in energy balance over the ocean. For ...

Alan K. Betts; W. Ridgway

1989-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

A Planetary Boundary Layer Height Climatology Derived from ECMWF Reanalysis Data  

Science Conference Proceedings (OSTI)

A planetary boundary layer (PBL) height climatology from ECMWF reanalysis data is generated and analyzed. Different methods are first compared to derive PBL heights from atmospheric temperature, pressure, and relative humidity (RH), which mostly ...

Axel von Engeln; João Teixeira

2013-09-01T23:59:59.000Z

262

Some Observational Evidence for Dry Soils Supporting Enhanced Relative Humidity at the Convective Boundary Layer Top  

Science Conference Proceedings (OSTI)

The tendency of the relative humidity at the top of a clear convective boundary layer (RHtop) is studied as an indicator of cloud formation over a semiarid region within the conceptual framework introduced by Ek and Holtslag. Typically the ...

D. Westra; G. J. Steeneveld; A. A. M. Holtslag

2012-08-01T23:59:59.000Z

263

Large-Scale Atmospheric Forcing by Southeast Pacific Boundary Layer Clouds: A Regional Model Study  

Science Conference Proceedings (OSTI)

A regional model is used to study the radiative effect of boundary layer clouds over the southeast Pacific on large-scale atmosphere circulation during August–October 1999. With the standard settings, the model simulates reasonably well the large-...

Yuqing Wang; Shang-Ping Xie; Bin Wang; Haiming Xu

2005-04-01T23:59:59.000Z

264

Dispersion of a Passive Tracer in Buoyancy- and Shear-Driven Boundary Layers  

Science Conference Proceedings (OSTI)

By means of finescale modeling [large-eddy simulation (LES)], the combined effect of thermal and mechanical forcing on the dispersion of a plume in a convective boundary layer is investigated. Dispersion of a passive tracer is studied in various ...

Alessandro Dosio; Jordi Vilà-Guerau de Arellano; Albert A. M. Holtslag; Peter J. H. Builtjes

2003-08-01T23:59:59.000Z

265

A PDF-Based Microphysics Parameterization for Simulation of Drizzling Boundary Layer Clouds  

Science Conference Proceedings (OSTI)

Formulating the contribution of subgrid-scale (SGS) variability to microphysical processes in boundary layer and deep convective cloud parameterizations is a challenging task because of the complexity of microphysical processes and the lack of ...

Anning Cheng; Kuan-Man Xu

2009-08-01T23:59:59.000Z

266

A Dual Mass Flux Framework for Boundary Layer Convection. Part II: Clouds  

Science Conference Proceedings (OSTI)

This paper presents the extension of the eddy diffusivity mass flux (EDMF) framework for turbulent transport into the statistical modeling of boundary layer clouds. The advection–diffusion decomposition that defines EDMF is projected onto the ...

Roel A. J. Neggers

2009-06-01T23:59:59.000Z

267

A PDF Dispersion Model for Buoyant Plumes in the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

A probability density function (PDF) dispersion model is presented for buoyant plumes in the convective boundary layer (CBL), where the mean concentration field C is obtained from the PDFs py and pz of tracer particle position in the lateral y ...

J. C. Weil; L. A. Corio; R. P. Brower

1997-08-01T23:59:59.000Z

268

How Does the Boundary Layer Contribute to Eyewall Replacement Cycles in Axisymmetric Tropical Cyclones?  

Science Conference Proceedings (OSTI)

Three diagnostic models of the axisymmetric tropical cyclone boundary layer, with different levels of approximation, are applied to the problem of tropical cyclones with concentric eyewalls. The outer eyewall is shown to have an inherently ...

Jeffrey D. Kepert

2013-09-01T23:59:59.000Z

269

Diapycnal Transport and Mixing Efficiency in Stratified Boundary Layers near Sloping Topography  

Science Conference Proceedings (OSTI)

The interaction of shear, stratification, and turbulence in boundary layers on sloping topography is investigated with the help of an idealized theoretical model, assuming uniform bottom slope and homogeneity in the upslope direction. It is shown ...

Lars Umlauf; Hans Burchard

2011-02-01T23:59:59.000Z

270

Observational Study of a Convective Internal Boundary Layer over Lake Michigan  

Science Conference Proceedings (OSTI)

Using aircraft data collected during the University of Chicago Lake-Effect Snow Storm project, the results of a case study of the convective thermal internal boundary layer (TIBL) over Lake Michigan are presented. An intense cold air outbreak on ...

Sam S. Chang; Roscoe R. Braham Jr.

1991-10-01T23:59:59.000Z

271

Evaluation of Numerical Predictions of Boundary Layer Structure during the Lake Michigan Ozone Study  

Science Conference Proceedings (OSTI)

The performance of two types of turbulence closures is compared in a 3D numerical investigation of an episode with poor air quality. The first is the Blackadar boundary layer scheme, which has a nonlocal closure for unstable conditions. The ...

Perry C. Shafran; Nelson L. Seaman; George A. Gayno

2000-03-01T23:59:59.000Z

272

A Lagrangian Long-Range Transport Model with Atmospheric Boundary Layer Chemistry  

Science Conference Proceedings (OSTI)

The present paper reports on the combination of a chemical model for the gas phase chemistry of the atmospheric boundary layer, with a Lagrangian model for the long-range transport of air pollutants. The resulting combined chemistry/transport ...

Anton Eliassen; Jørgen Saltbones; Frode Stordal; Øystein Hov; Ivar S. A. Isaksen; Frode Stordal

1982-11-01T23:59:59.000Z

273

How does the boundary layer contribute to eyewall replacement cycles in axisymmetric tropical cyclones?  

Science Conference Proceedings (OSTI)

Three diagnostic models of the axisymmetric tropical cyclone boundary layer, with different levels of approximation, are applied to the problem of tropical cyclones with concentric eyewalls. The outer eyewall is shown to have an inherently ...

Jeffrey D. Kepert

274

Plume Dispersion in the Convective Boundary Layer. Part I: CONDORS Field Experiment and Example Measurements  

Science Conference Proceedings (OSTI)

Project CONDORS (CONvective Diffusion Observed by Remote Sensors) measured the dispersion of a nonbuoyant plume in the highly convective boundary layer. Laboratory and numerical models have predicted vertical profiles of a passive tracer that are ...

W. L. Eberhard; W. R. Moninger; G. A. Briggs

1988-05-01T23:59:59.000Z

275

The Numerical Representation of Entrainment in Parameterizations of Boundary Layer Turbulent Mixing  

Science Conference Proceedings (OSTI)

Problems have been identified with parameterizations of convective boundary layers, in particular with their numerical treatment of the capping inversion. It is shown that the turbulence scheme can combine with the numerical representation of ...

A. P. Lock

2001-05-01T23:59:59.000Z

276

The Impact of Chemistry on Flux Estimates in the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Different higher-order flux closures are compared for two chemistry cases using a large eddy simulation (LES) model for the convective atmospheric boundary layer. Both a simple chemistry case and a photochemistry case more representative for ...

Arthur C. Petersen

2000-10-01T23:59:59.000Z

277

An Indirect Estimation of Convective Boundary Layer Structure for Use in Pollution Dispersion Models  

Science Conference Proceedings (OSTI)

Dispersion models of the convectively driven atmospheric boundary layer (ABL) often require as input meteorological parameters that are not routinely measured. These parameters usually include the surface fluxes of heat and momentum ?Cpw???and ?u?w?, the ...

James M. Wilczak; Mary Sue Phillips

1986-11-01T23:59:59.000Z

278

Structure of the Planetary Boundary Layer and Implications for its Modeling  

Science Conference Proceedings (OSTI)

Through the innovative use of laboratory experiments, numerical simulations, and direct measurements, researchers have greatly extended our knowledge of planetary boundary layer (PBL) structure over the last 15 years. This paper reviews some ...

John C. Wyngaard

1985-11-01T23:59:59.000Z

279

An Investigation of the Boundary Layer Dynamics of Sardinia Island under Sea-Breeze Conditions  

Science Conference Proceedings (OSTI)

A numerical mesoscale model is used to study the wind field and the boundary layer structure of the island of Sardinia during typical summer conditions. The numerical model is three-dimensional and employs a higher-order turbulence closure ...

Dimitrios Melas; Alfredo Lavagnini; Anna-Maria Sempreviva

2000-04-01T23:59:59.000Z

280

Convective Planetary Boundary Layer Interactions with the Land Surface at Diurnal Time Scales: Diagnostics and Feedbacks  

Science Conference Proceedings (OSTI)

The convective planetary boundary layer (PBL) integrates surface fluxes and conditions over regional and diurnal scales. As a result, the structure and evolution of the PBL contains information directly related to land surface states. To examine ...

Joseph A. Santanello Jr.; Mark A. Friedl; Michael B. Ek

2007-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Application of the E – ? Turbulence Closure Model to the Neutral and Stable Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

In the E – ? turbulence model an eddy-exchange coefficient is evaluated from the turbulent kinetic energy E and viscous dissipation ?. In this study we will apply the E – ? model to the stable and neutral atmospheric boundary layer. A discussion ...

P. G. Duynkerke

1988-03-01T23:59:59.000Z

282

Turbulence Characteristics and Dissipation Estimates in the Coastal Ocean Bottom Boundary Layer from PIV Data  

Science Conference Proceedings (OSTI)

Turbulence characteristics in the coastal ocean bottom boundary layer are measured using a submersible Particle Image Velocimetry (PIV) system with a sample area of 20 × 20 cm2. Measurements are performed in the New York Bight at elevations ...

P. Doron; L. Bertuccioli; J. Katz; T. R. Osborn

2001-08-01T23:59:59.000Z

283

A time-varying subsidence parameterization for the atmospheric boundary layer  

E-Print Network (OSTI)

This study examines the effect of a time-varying parameterization for subsidence in the atmospheric boundary layer (ABL) on a one-dimensional coupled land-atmosphere model. Measurements of large-scale divergence in the ABL ...

Flagg, David D. (David Douglas)

2005-01-01T23:59:59.000Z

284

Relating Eulerian and Lagrangian Statistics for the Turbulent Dispersion in the Atmospheric Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Eulerian and Lagrangian statistics in the atmospheric convective boundary layer (CBL) are studied by means of large eddy simulation (LES). Spectra analysis is performed in both the Eulerian and Lagrangian frameworks, autocorrelations are ...

Alessandro Dosio; Jordi Vilá Guerau de Arellano; Albert A. M. Holtslag; Peter J. H. Builtjes

2005-04-01T23:59:59.000Z

285

A UHF Wind Profiler for the Boundary Layer: Brief Description and Initial Results  

Science Conference Proceedings (OSTI)

In this paper we describe a boundary layer radar recently developed at NOAA's Aeronomy Laboratory. This radar extends wind profiler technology by using a small, relatively inexpensive radar to provide continuous, high-resolution wind measurements ...

W. L. Ecklund; D. A. Carter; B. B. Balsley

1988-06-01T23:59:59.000Z

286

Numerical Modeling of the Turbulent Fluxes of Chemically Reactive Trace Gases in the Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

Turbulent fluxes of chemically reactive trace gases in the neutral atmospheric boundary layer (ABL) were simulated with a one-dimensional, coupled diffusion-chemistry model. The effects of rapid chemical reactions were included with a suite of ...

W. Gao; M. L. Wesely

1994-07-01T23:59:59.000Z

287

The influence of submeso processes on stable boundary layer similarity relationships  

Science Conference Proceedings (OSTI)

Previous observational studies in the stable boundary layer diverge appreciably on the values of dimensionless ratios between turbulence-related quantities and on their stability dependence. In the present study, the hypothesis that such ...

Otávio C. Acevedo; Felipe D. Costa; Pablo E. S. Oliveira; Franciano S. Puhales; Gervásio A. Degrazia; Débora R. Roberti

288

Finding Boundary Layer Top: Application of a Wavelet Covariance Transform to Lidar Backscatter Profiles  

Science Conference Proceedings (OSTI)

Several recent studies have utilized a Haar wavelet covariance transform to provide automated detection of the boundary layer top from lidar backscatter profiles by locating the maximum in the covariance profiles. This approach is effective where ...

Ian M. Brooks

2003-08-01T23:59:59.000Z

289

An Eulerian Model of Dispersion in the Convective Boundary Layer Using Explicit Periodic Advections  

Science Conference Proceedings (OSTI)

The authors have developed a relatively simple, first-order closure, Eulerian diffusion model, in which turbulent coherent structures of the convective boundary layer are explicitly included as periodic velocities imposed on a stationary and ...

John J. Carroll; Ming Liu

1995-11-01T23:59:59.000Z

290

Large-Eddy Simulation of Roll Vortices in a Hurricane Boundary Layer  

Science Conference Proceedings (OSTI)

For the last decade, horizontal roll vortices have been often observed in hurricane boundary layers (HBLs). In this study, a large-eddy simulation is performed to explore the formation mechanism of the horizontal roll vortices and their ...

Mikio Nakanishi; Hiroshi Niino

2012-12-01T23:59:59.000Z

291

Multiple-Doppler Radar Observations of the Evolution of Vorticity Extrema in a Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Overdetermined, dual-Doppler wind syntheses are used to document the evolution, structure, and dynamics of vertical vorticity extrema observed in a convective boundary layer during the 12 June 2002 International H2O Project (IHOP) mission. ...

Paul Markowski; Christina Hannon

2006-01-01T23:59:59.000Z

292

Modification of a Commercial Condensation Particle Counter for Boundary Layer Balloon-Borne Aerosol Studies  

Science Conference Proceedings (OSTI)

A commercial battery-driven condensation particle counter (TSI-8020) was modified for use in a lightweight payload for tethered balloons to study new particle formation in the planetary boundary layer. After modifications, the instrument was ...

Jost Heintzenberg; Alfred Wiedensohler; Stefan Kütz

1999-05-01T23:59:59.000Z

293

A Mathematical Model of the Ocean Boundary Layer under Drifting Melting ice  

Science Conference Proceedings (OSTI)

A mathematical model of the ocean boundary layer under drifting melting ice is formulated, verified, and applied. The model is based on the conservation equations for heat, salt, and momentum and uses turbulence models to achieve closure. Novel ...

U. Svensson; A. Omstedt

1990-02-01T23:59:59.000Z

294

Ultralight Sounder: An Airborne System for Studying the Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

Until recently, investigations of the temperature structure of the planetary boundary layer have been confined to the use of balloon soundings (tethered balloon sondes, rawinsondes), disposable drop-sondes, or high performance instrumented ...

Randolph D. Borys; Kapin Tan; William Cotton

1983-04-01T23:59:59.000Z

295

Surface Temperature Calculation in Atmospheric Circulation Models with Coarse Resolution of the Boundary Layer  

Science Conference Proceedings (OSTI)

A parameterization of the surface nocturnal inversion of temperature is proposed to enable atmospheric circulation models to handle the surface energy budget without having to resolve the boundary layer. The scheme allows a wide range of vertical ...

Yves Delage

1986-02-01T23:59:59.000Z

296

Lidar-Observed Stress Vectors and Veer in the Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

We demonstrate that a pulsed wind lidar is a reliable instrument for measuring angles between horizontal vectors of significance in the atmospheric boundary layer. We consider three different angles: the wind turning, the angle between the stress ...

Jacob Berg; Jakob Mann; Edward G. Patton

297

On the Time Scale of Nocturnal Boundary Layer Cooling in Valleys and Basins and over Plains  

Science Conference Proceedings (OSTI)

Sequences of vertical temperature soundings over flat plains and in a variety of valleys and basins of different sizes and shapes were used to determine cooling-time-scale characteristics in the nocturnal stable boundary layer under clear, ...

Stephan F. J. De Wekker; C. David Whiteman

2006-06-01T23:59:59.000Z

298

Characteristics of Vertical Velocity Fluctuations in a Convective Urban Boundary Layer  

Science Conference Proceedings (OSTI)

Vertical air motions within the convective boundary layer over Toronto, Canada, have been observed using a monostatic Doppler echosonde. Data were acquired on cloudless days with strong insolation and light winds, when turbulence dynamics were ...

Humfrey Melling; Roland List

1980-10-01T23:59:59.000Z

299

Climatology of Warm Boundary Layer Clouds at the ARM SGP Site and Their Comparison to Models  

Science Conference Proceedings (OSTI)

A 4-yr climatology (1997–2000) of warm boundary layer cloud properties is developed for the U.S. Department of Energy Atmospheric Radiation Measurement (ARM) Program Southern Great Plains (SGP) site. Parameters in the climatology include cloud ...

Manajit Sengupta; Eugene E. Clothiaux; Thomas P. Ackerman

2004-12-01T23:59:59.000Z

300

Empirical Orthogonal Function Analysis of the Weakly Convective Atmospheric Boundary Layer. Part I: Eddy Structures  

Science Conference Proceedings (OSTI)

Three-dimensional empirical orthogonal functions (EOFs), representing atmospheric turbulence structures, are determined from a large-eddy simulation of a weakly convective, planetary boundary layer. The method of analysis is based on Lumley's ...

D. Keith Wilson

1996-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Asymmetric Hurricane Boundary Layer Structure from Dropsonde Composites in Relation to the Environmental Vertical Wind Shear  

Science Conference Proceedings (OSTI)

This study investigates the asymmetric structure of the hurricane boundary layer in relation to the environmental vertical wind shear in the inner core region. Data from 1878 GPS dropsondes deployed by research aircraft in 19 hurricanes are ...

Jun A. Zhang; Robert F. Rogers; Paul D. Reasor; Eric W. Uhlhorn; Frank D. Marks Jr.

302

Thermodynamic Variability within the Convective Boundary Layer Due to Horizontal Convective Rolls  

Science Conference Proceedings (OSTI)

Data from the Convection and Precipitation/Electrification (CaPE) Experiment conducted during the summer of 1991 are used to examine and quantify the horizontal variability of temperature and moisture within the convective boundary layer (CBL). ...

Tammy M. Weckwerth; James W. Wilson; Roger M. Wakimoto

1996-05-01T23:59:59.000Z

303

A Comparison of Shear- and Buoyancy-Driven Planetary Boundary Layer Flows  

Science Conference Proceedings (OSTI)

Planetary boundary layer (PBL) flows are known to exhibit fundamental differences depending on the relative combination of wind shear and buoyancy forces. These differences are not unexpected in that shear instabilities occur locally, while ...

Chin-Hoh Moeng; Peter P. Sullivan

1994-04-01T23:59:59.000Z

304

Integral Scales for the Nocturnal Boundary Layer. Part II: Heat Budget, Transport and Energy Implications  

Science Conference Proceedings (OSTI)

In Part I, external forcings such as pressure gradient, terrain roughness and imposed cooling were used to forecast the thickness and strength of an exponentially-shaped (ES) nocturnal boundary layer (NBL) temperature profile. In Part II, it is ...

Roland B. Stull

1983-11-01T23:59:59.000Z

305

A Comparison of Ekman Pumping in Approximate Models of the Accelerating Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

Several theories of the planetary boundary layer that retain the flow accelerations in approximate form are compared. Two special test cases focus on the role of either local or convective accelerations. The semigeotriptic theory of Cullen ...

Peter R. Bannon

1998-04-01T23:59:59.000Z

306

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

307

Asymmetric Behavior of an Oceanic Boundary Layer above a Sloping Bottom  

Science Conference Proceedings (OSTI)

The effects of stratification, planetary rotation and a sloping bottom combine to produce an asymmetric response in which the characteristics of an oceanic bottom boundary layer depend on the direction, in addition to the magnitude, of the along-...

J. H. Trowbridge; S. J. Lentz

1991-08-01T23:59:59.000Z

308

Observations and Numerical Model Simulations of the Atmospheric Boundary Layer in the Santa Barbara Coastal Region  

Science Conference Proceedings (OSTI)

Observations of boundary-layer flow within the Santa Barbara region taken on 20 September 1985 revel the presence of a wide variety of flow features, including mesoscale wind vortices sea/land breezes, and thermally driven upslope/downslope ...

J. M. Wilczak; W. F. Dabberdt; R. A. Kropfli

1991-05-01T23:59:59.000Z

309

Atmospheric Boundary-Layer Properties Affecting Wind Forecasting in Coastal Regions  

Science Conference Proceedings (OSTI)

Atmospheric boundary-layer properties and processes in gulf and coastal regions have special characteristics that are important in forecasting winds and ocean forcing. Accurate coastal-wind predictions require knowledge of local responses to a ...

Kenneth L. Davidson; Patricia J. Boyle; Peter S. Guest

1992-08-01T23:59:59.000Z

310

Cluster Analysis: A new approach applied to Lidar measurements for Atmospheric Boundary Layer height estimation  

Science Conference Proceedings (OSTI)

Several procedures are widely applied to estimate the Atmospheric Boundary Layer (ABL) top height by using aerosols as tracers from lidar measurements. These methods represent different mathematical approaches relying on either the abrupt step of ...

Daniel Toledo; Carmen Córdoba-Jabonero; Manuel Gil-Ojeda

311

Scalar Turbulence in Convective Boundary Layers by Changing the Entrainment Flux  

Science Conference Proceedings (OSTI)

A large-eddy simulation model is adopted to investigate the evolution of scalars transported by atmospheric cloud-free convective boundary layer flows. Temperature fluctuations due to the ground release of sensible heat and concentration ...

Alessandra S. Lanotte; Irene M. Mazzitelli

2013-01-01T23:59:59.000Z

312

Surface Heterogeneity Effects on Regional-Scale Fluxes in Stable Boundary Layers: Surface Temperature Transitions  

Science Conference Proceedings (OSTI)

Large-eddy simulation, with recently developed dynamic subgrid-scale models, is used to study the effect of heterogeneous surface temperature distributions on regional-scale turbulent fluxes in the stable boundary layer (SBL). Simulations are ...

Rob Stoll; Fernando Porté-Agel

2009-02-01T23:59:59.000Z

313

Turbulence Spectra and Dissipation Rates in a Wind Tunnel Model of the Atmospheric Convective Boundary Layer  

Science Conference Proceedings (OSTI)

A model of the atmospheric convective boundary layer (CBL) is realized in the thermally stratified wind tunnel of the Institute of Hydrology and Water Resources, University of Karlsruhe. Further experimental results from this model are presented. ...

Rolf Kaiser; Evgeni Fedorovich

1998-02-01T23:59:59.000Z

314

A Volume-Imaging Radar Wind Profiler for Atmospheric Boundary Layer Turbulence Studies  

Science Conference Proceedings (OSTI)

This paper describes the turbulent eddy profiler (TEP), a volume-imaging, UHF radar wind profiler designed for clear-air measurements in the atmospheric boundary layer on scales comparable to grid cell sizes of large eddy simulation models. TEP ...

James B. Mead; Geoffrey Hopcraft; Stephen J. Frasier; Brian D. Pollard; Christopher D. Cherry; Daniel H. Schaubert; Robert E. McIntosh

1998-08-01T23:59:59.000Z

315

Drizzle in Stratiform Boundary Layer Clouds. Part I: Vertical and Horizontal Structure  

Science Conference Proceedings (OSTI)

Detailed observations of stratiform boundary layer clouds on 12 days are examined with specific reference to drizzle formation processes. The clouds differ considerably in mean thickness, liquid water path (LWP), and droplet concentration. Cloud-...

R. Wood

2005-09-01T23:59:59.000Z

316

Observations of Small-Scale Turbulence and Energy Dissipation Rates in the Cloudy Boundary Layer  

Science Conference Proceedings (OSTI)

Tethered balloon–borne measurements with a resolution in the order of 10 cm in a cloudy boundary layer are presented. Two examples sampled under different conditions concerning the clouds' stage of life are discussed. The hypothesis tested here ...

Holger Siebert; Katrin Lehmann; Manfred Wendisch

2006-05-01T23:59:59.000Z

317

A New Second-Order Turbulence Closure Scheme for the Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

A new turbulence formulation for the planetary boundary layer (PBL) is presented and compared with large-eddy simulations (LES) for the dry PBL. The new scheme contains a prognostic equation for the turbulent kinetic energy. Other second-order ...

K. Abdella; N. McFarlane

1997-07-01T23:59:59.000Z

318

Mean Structure of the Nocturnal Boundary Layer under Strong and Weak Wind Conditions: EPRI Case Study  

Science Conference Proceedings (OSTI)

The major objective of this study was to analyze the mean structure and evolution of the nocturnal boundary layer (NBL) under strong and weak wind conditions. Meteorological data collected during the plume-validation experiment conducted by the ...

T. B. P. S. Rama V. Krishna; Maithili Sharan; S. G. Gopalakrishnan; Aditi

2003-07-01T23:59:59.000Z

319

The Impact of Wet Soil and Canopy Temperatures on Daytime Boundary–Layer Growth  

Science Conference Proceedings (OSTI)

The impact of very wet soil and canopy temperatures on the surface sensible heat flux, and on related daytime boundary-layer properties is evaluated. For very wet soils, two winter situations are considered, related to significant changes in soil ...

M. Segal; J. R. Garratt; G. Kallos; R. A. Pielke

1989-12-01T23:59:59.000Z

320

Thunderstorm Initiation, Organization, and Lifetime Associated with Florida Boundary Layer Convergence Lines  

Science Conference Proceedings (OSTI)

The initiation, organization, and longevity of thunderstorms associated with boundary layer convergence lines in the Cape Canaveral, Florida, vicinity are examined using data from the Convection and Precipitation/Electrification (CaPE) ...

James W. Wilson; Daniel L. Megenhardt

1997-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Numerical Simulations of a Stratocumulus-Capped Boundary Layer Observed over Land  

Science Conference Proceedings (OSTI)

Detailed observations of both mean and turbulence fields of an anticyclonic, quasi-steady state, stratocumulus-capped boundary layer obtained with ground-based and balloonborne equipment during the night of 19/20 November 1976 at Cardington, ...

Chih-Yue Jim Kao; Tetsuji Yamada

1989-03-01T23:59:59.000Z

322

A 6-yr Climatology of Fronts Affecting Helsinki, Finland, and Their Boundary Layer Structure  

Science Conference Proceedings (OSTI)

A 6-yr climatology of the frequency, characteristics, and boundary layer structure of synoptic-scale fronts in Helsinki, Finland, was created using significant weather charts and observations from a 327-m-tall mast and from the Station for ...

Victoria A. Sinclair

2013-09-01T23:59:59.000Z

323

Spectral Estimates of Bed Shear Stress at Subcritical Reynolds Numbers in a Tidal Boundary Layer  

Science Conference Proceedings (OSTI)

Velocity measurements from five levels in the constant-stress region of a neutrally stratified turbulent boundary layer are used to show that below a critical height the spectral energy density in the inertial subrange remains constant at a ...

Malcolm O. Green

1992-08-01T23:59:59.000Z

324

Validation of a UV to RF High Spectral Resolution Atmospheric Boundary Layer Characterization Tool  

Science Conference Proceedings (OSTI)

This paper demonstrates the capability of the Laser Environmental Effects Definition and Reference (LEEDR) model to accurately characterize the meteorological parameters and radiative transfer effects of the atmospheric boundary layer with surface ...

Steven T. Fiorino; Robb M. Randall; Michelle F. Via; Jarred L. Burley

325

Acoustic Sounder Observations of the Atmospheric Boundary Layer from the Top of a Steep Mountain  

Science Conference Proceedings (OSTI)

Preliminary results from a series of experiments utilizing an acoustic sounder located at the top of a 1026 m mountain are presented which show some interesting features of the evolution of the atmospheric boundary layer.

D. N. Asimakopoulos; D. G. Deligiorgi; D. P. Lalas

1980-01-01T23:59:59.000Z

326

Boundary Layer Control of Buoyant Coastal Currents and the Establishment of a Shelfbreak Front  

Science Conference Proceedings (OSTI)

The bottom boundary layer exerts a powerful control over buoyant coastal currents that contact the bottom, providing a mechanism for trapping density fronts along isobaths. Recent observations suggest that this mechanism may play a role in ...

David C. Chapman

2000-11-01T23:59:59.000Z

327

The Development of a Scanning Raman Water Vapor Lidar for Boundary Layer and Tropospheric Observations  

Science Conference Proceedings (OSTI)

A scanning, ultraviolet, Raman water vapor lidar designed primarily for boundary layer measurements has been built and operated by the Los Alamos National Laboratory Ground-Based Earth Observing Network team. The system provides high temporal and ...

W. E. Eichinger; D. I. Cooper; P. R. Forman; J. Griegos; M. A. Osborn; D. Richter; L. L. Tellier; R. Thornton

1999-11-01T23:59:59.000Z

328

Boundary Layer Height and Entrainment Zone Thickness Measured by Lidars and Wind-Profiling Radars  

Science Conference Proceedings (OSTI)

The authors examine measurements of boundary layer height zi and entrainment zone thickness observed with two lidars and with a radar wind profiler during the Flatland96 Lidars in Flat Terrain experiment. Lidar backscatter is proportional to ...

Stephen A. Cohn; Wayne M. Angevine

2000-08-01T23:59:59.000Z

329

Aspects of Convective Boundary Layer Turbulence Measured by a Dual-Doppler Lidar System  

Science Conference Proceedings (OSTI)

Special designed dual-Doppler setups can be used to retrieve simultaneous measurements of two wind components with high temporal resolution in several heights throughout the atmospheric boundary layer. During a field campaign in summer 2011, ...

Luisa Röhner; Katja Träumner

2013-09-01T23:59:59.000Z

330

Lidar Observations of the Vertical Aerosol Flux in the Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

The vertical aerosol transport in the planetary boundary layer (PBL) is investigated with lidars. Profiles of the vertical wind velocity are measured with a 2-?m Doppler wind lidar. Aerosol parameters are derived from observations with an aerosol ...

Ronny Engelmann; Ulla Wandinger; Albert Ansmann; Detlef Müller; Egidijus Žeromskis; Dietrich Althausen; Birgit Wehner

2008-08-01T23:59:59.000Z

331

Lidar-Observed Stress Vectors and Veer in the Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

This study demonstrates that a pulsed wind lidar is a reliable instrument for measuring angles between horizontal vectors of significance in the atmospheric boundary layer. Three different angles are considered: the wind turning, the angle between ...

Jacob Berg; Jakob Mann; Edward G. Patton

2013-09-01T23:59:59.000Z

332

Retrieval of Urban Boundary Layer Structures from Doppler Lidar Data. Part II: Proper Orthogonal Decomposition  

Science Conference Proceedings (OSTI)

The proper orthogonal decomposition technique is applied to 74 snapshots of 3D wind and temperature fields to study turbulent coherent structures and their interplay in the urban boundary layer over Oklahoma City, Oklahoma. These snapshots of ...

Ching-Long Lin; Quanxin Xia; Ronald Calhoun

2008-01-01T23:59:59.000Z

333

Doppler Profiler and Radar Observations of Boundary Layer Variability during the Landfall of Tropical Storm Gabrielle  

Science Conference Proceedings (OSTI)

Detailed observations of boundary layer structure were acquired on 14 September 2001, prior to and during the landfall of Tropical Storm Gabrielle. The Mobile Integrated Profiling System (MIPS) and the Shared Mobile Atmospheric Research and ...

Kevin R. Knupp; Justin Walters; Michael Biggerstaff

2006-01-01T23:59:59.000Z

334

A Coupled Hydrodynamic–Bottom Boundary Layer Model of Ekman Flow on Stratified Continental Shelves  

Science Conference Proceedings (OSTI)

This paper describes a hydrodynamic model with turbulent energy closure that uses a simplified wave-current interaction model of the bottom boundary layer to compute bed drag coefficients. The coupled model is used to investigate the interaction ...

Timothy R. Keen; Scott M. Glenn

1994-08-01T23:59:59.000Z

335

The Role of Quantitative Infrared Imagery in Investigations of the Nocturnal Boundary Layer  

Science Conference Proceedings (OSTI)

During the Cooperative Atmospheric–Surface Exchange Study in 1999 (CASES99), an intensive investigation of the stable nocturnal boundary layer, a versatile and sensitive cryogenically cooled thermal imaging radiometer, the Inframetrics PM 380 ...

Lawrence F. Radke; Anthony C. Delany

2002-11-01T23:59:59.000Z

336

Velocity and Stress in the Deep-Ocean Boundary Layer  

Science Conference Proceedings (OSTI)

In order to predict the response of deep ocean sediments to the near-bottom currents, accurate estimates of the near-bottom velocity and the boundary shear stress are necessary. Because of the unsteady nature of deep ocean currents, dynamic ...

S. R. McLean; J. Yean

1987-09-01T23:59:59.000Z

337

A new wall-shear stress model for atmospheric boundary layer simulations  

Science Conference Proceedings (OSTI)

A new wall-shear stress model to be used as wall-boundary condition for Large Eddy Simulations of the Atmospheric Boundary Layer is proposed. The new model computes the wall shear stress and the vertical derivatives of the streamwise velocity ...

Marcus Hultmark; Marc Calaf; Marc B. Parlange

338

The Bottom Boundary Layer Over the Northern California Shelf  

Science Conference Proceedings (OSTI)

Moored temperature and shipboard CTD observations from a northern California coastal upwelling region reveal variable bottom mixed-layer heights that are typically 5–15 m, but occasionally exceed 50 m. Observations from Oregon, northern ...

Steven J. Lentz; John H. Trowbridge

1991-08-01T23:59:59.000Z

339

Turbulent Mixing with Chemical Reaction in the Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

Detailed statistics of the fluctuating concentration field produced by large-eddy simulations (LES) of the chemically reactive mixing of two species in a convectively driven mixed layer are presented. The effect of the turbulent mixing on the ...

R. I. Sykes; S. F. Parker; D. S. Henn; W. S. Lewellen

1994-07-01T23:59:59.000Z

340

Mesoscale Modeling of Boundary Layer Refractivity and Atmospheric Ducting  

Science Conference Proceedings (OSTI)

In this study four mesoscale forecasting systems were used to investigate the four-dimensional structure of atmospheric refractivity and ducting layers that occur within evolving synoptic conditions over the eastern seaboard of the United States. ...

Tracy Haack; Changgui Wang; Sally Garrett; Anna Glazer; Jocelyn Mailhot; Robert Marshall

2010-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Role of Amorphous Boundary Layer in Enhancing Ionic Conductivity of Lithium–lanthanum–titanate Electrolyte  

DOE Green Energy (OSTI)

The low ionic conductivity is a bottleneck of the inorganic solid state electrolyte used for lithium ion battery. In ceramic electrolytes, grain boundary usually dominates the total conductivity. In order to improve the grain boundary effect, an amorphous silica layer is introduced into grain boundary of ceramic electrolytes based on lithium-lanthanum-titanate, as evidenced by electron microscopy. The results showed that the total ionic conductivity could be to be enhanced over 1 x 10{sup -4} S/cm at room temperature. The reasons can be attributed to removing the anisotropy of outer-shell of grains, supplement of lithium ions in various sites in grain boundary and close bindings among grains by the amorphous boundary layer among grains.

Mei, A.; Wang, X.; Lana, J.-L.; Fenga, Y.-C.; Genga, H.-X.; Lina, Y.-H.; Nana, C.-W.

2010-03-01T23:59:59.000Z

342

The Parameterization Of the Planetary Boundary Layer in the UCLA General Circulation Model: Formulation and Results  

Science Conference Proceedings (OSTI)

A planetary boundary layer (PBL) parameterization for general circulation models (GCMs) is presented. It uses a mixed-layer approach in which the PBL is assumed to be capped by discontinuities in the mean profiles. Both clear and cloud-topped ...

Max J. Suarez; Akio Arakawa; David A. Randall

1983-11-01T23:59:59.000Z

343

A Numerical Investigation of Tetroon versus Fluid Particle Dispersion in the Convective Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

Data from Deardorff's (1974) turbulence model are used in simulations of fluid particle and tetroon dispersion in the convective atmospheric boundary layer with ?h/L ? 1, where h is the mixed-layer depth. It is found that the lateral spread ?y(t) ...

Robert G. Lamb

1981-04-01T23:59:59.000Z

344

On the Turbulent Mixing Length in the Oceanic Boundary Layer  

Science Conference Proceedings (OSTI)

Turbulence measurements from under drifting pack ice illustrate the distribution of turbulent mixing length in the well-mixed layer of the upper ocean. Mixing length (? ? K/u*, where K and u* are the local eddy viscosity and square root of ...

Miles G. Mcphee

1994-09-01T23:59:59.000Z

345

Investigation of Upstream Boundary Layer Influence on Mountain Wave Breaking and Lee Wave Rotors Using a Large-Eddy Simulation  

Science Conference Proceedings (OSTI)

Interactions between a turbulent boundary layer and nonlinear mountain waves are explored using a large-eddy simulation model. Simulations of a self-induced critical layer, which develop a stagnation layer and a strong leeside surface jet, are ...

Craig M. Smith; Eric D. Skyllingstad

2009-10-01T23:59:59.000Z

346

Droplet Spectra Observed in Marine Stratus Cloud Layers  

Science Conference Proceedings (OSTI)

Airborne measurements of the water droplet spectra n(r) (r is radius) (0.23 ? r ? 150 ?m) were made at about 14 levels in stratus layers during May and August 1981, 130 km SW of San Diego. All May days were found to be associated with air masses ...

V. Ray Noonkester

1984-03-01T23:59:59.000Z

347

The Physics of the Marine Stratocumulus-Capped Mixed Layer  

Science Conference Proceedings (OSTI)

In order to simulate the stratocumulus-capped mixed layer, a one-dimensional stratocumulus model is developed. This model consists of five major points: 1) a one-dimensional (1D) option of the CSU Cloud/Mesoscale Model, 2) a partially diagnostic ...

Chaing Chen; William R. Cotton

1987-10-01T23:59:59.000Z

348

Thin Acoustic Scattering Layers Observed in the Low Marine Boundary Layer  

Science Conference Proceedings (OSTI)

A novel high-resolution, low minimum-range monostatic sodar, steerable in elevation angle, was tested aboard the Research Vessel Point Sur during Project FIRE (First International Satellite Cloud Climatology Project Regional Experiment), 7–16 ...

T. K. Cheung; C. G. Little; H. E. Ramm

1990-11-01T23:59:59.000Z

349

The Boundary Layer of Mars: Fluxes, Stability, Turbulent Spectra, and Growth of the Mixed Layer  

Science Conference Proceedings (OSTI)

Spectra of wind from high-frequency measurements in the Martian atmospheric surface layer, along with the diurnal variation of the height of the mixed surface layer, are calculated for the first time for Mars. Heat and momentum fluxes, stability, ...

James E. Tillman; Lars Landberg; Søren E. Larsen

1994-06-01T23:59:59.000Z

350

Impact of Surface Flux Formulations and Geostrophic Forcing on Large-Eddy Simulations of Diurnal Atmospheric Boundary Layer Flow  

Science Conference Proceedings (OSTI)

The impact of surface flux boundary conditions and geostrophic forcing on multiday evolution of flow in the atmospheric boundary layer (ABL) was assessed using large-eddy simulations (LES). The LES investigations included several combinations of ...

Vijayant Kumar; Gunilla Svensson; A. A. M. Holtslag; Charles Meneveau; Marc B. Parlange

2010-07-01T23:59:59.000Z

351

Comparison of two-equation turbulence models for boundary layers with pressure gradient  

SciTech Connect

This paper compares the performance of eight low Reynolds number k-epsilon and k-omega models for high Reynolds number, incompressible turbulent boundary layers with favorable, zero, and adverse pressure gradients. Results obtained underscore the k-epsilon model's unsuitability for such flows. Even more seriously, the k-epsilon model is demonstrated to be inconsistent with the well-established physical structure of the turbulent boundary layer, and low Reynolds number corrections cannot remove the inconsistency. By contrast, the k-omega model, with and without low Reynolds number modifications, proves to be very accurate for all of the tests conducted. 16 refs.

Wilcox, D.C. (DCW Industries, Inc., La Canada, CA (United States))

1993-08-01T23:59:59.000Z

352

Anthropogenic moisture production and its effect on boundary layer circulations over New York City  

SciTech Connect

A heat and moisture excess over New York City is shown to exist by the analysis of helicopter soundings of temperature and wet bulb depression. The magnitude of the temporal and spatial distribution of anthropogenic moisture emissions in New York City were estimated from fuel usage data. The URBMET urban boundary layer model was used to evaluate the effects on the dynamics of the urban boundary layer resulting from the observed urban moisture excess. Work is currently in progress which seeks to determine the fraction of the observed moisture excess over New York that is due to anthropogenic sources. (auth)

Bornstein, R.D.; Tam, Y.T.

1975-01-01T23:59:59.000Z

353

Summertime Marine Refractivity Conditions along Coastal California  

Science Conference Proceedings (OSTI)

Large vertical gradients of temperature and moisture, which are not uncommon at the top of the marine atmospheric boundary layer (MABL), yield strong gradients in microwave refractivity that can result in anomalous electromagnetic (EM) ...

Tracy Haack; Stephen D. Burk

2001-04-01T23:59:59.000Z

354

The effect of periodic unsteady wakes on boundary layer transition and heat transfer on a curved plate.  

E-Print Network (OSTI)

??The effect of unsteady periodic wakes on heat transfer and boundary layer transition was investigated on a constant curvature heat transfer curved plate in a… (more)

Wright, Lance Cole

2012-01-01T23:59:59.000Z

355

An experimental and numerical study of boundary layer structure over areas of inhomogeneous sensible heat fluxes  

SciTech Connect

In June of 1992 a boundary-layer experiment was carried out near Boardman, Oregon. The campaigns were part of a program of studies under the auspices of the US Department of Energy`s Atmospheric Radiation Measurement (ARM) program, whose goal is to improve the treatment of radiative transfer, particularly as affected by clouds, in general circulation models (GCMs) used for climate studies. One aspect of this program is concerned with the determination of appropriate lower boundary conditions for such models and the representation of subgrid-scale variability in regions where the surface conditions are not uniform. To study this problem, boundary-layer and surface properties were measured over a region of two sharply contrasting land types: a large, dry, sagebrush steppe area and irrigated farmland that formed the east, northeast, and western borders of the steppe. A combination of surface flux instrumentation, airsondes, sodars, and near-surface wind and temperature sensors was used. Measurements were carried out over the eastern portion of this region, which featured a well-defined boundary between the dry and irrigated areas. In this paper, the authors present some results from those observations and from a set of numerical simulations that address the effects of inhomogeneous surface fluxes on boundary-layer structure.

Zhong, S.; Doran, J.C.

1994-03-01T23:59:59.000Z

356

Bulk Models of the Sheared Convective Boundary Layer: Evaluation through Large Eddy Simulations  

Science Conference Proceedings (OSTI)

A set of first-order model (FOM) equations, describing the sheared convective boundary layer (CBL) evolution, is derived. The model output is compared with predictions of the zero-order bulk model (ZOM) for the same CBL type. Large eddy ...

Robert Conzemius; Evgeni Fedorovich

2007-03-01T23:59:59.000Z

357

An Integrated Turbulence Scheme for Boundary Layers with Shallow Cumulus Applied to Pollutant Transport  

Science Conference Proceedings (OSTI)

A scheme is described that provides an integrated description of turbulent transport in free convective boundary layers with shallow cumulus. The scheme uses a mass-flux formulation, as is commonly found in cumulus schemes, and a 1.5-order ...

Wayne M. Angevine

2005-09-01T23:59:59.000Z

358

Performance of an Eddy Diffusivity–Mass Flux Scheme for Shallow Cumulus Boundary Layers  

Science Conference Proceedings (OSTI)

Comparisons between single-column (SCM) simulations with the total energy–mass flux boundary layer scheme (TEMF) and large-eddy simulations (LES) are shown for four cases from the Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) ...

Wayne M. Angevine; Hongli Jiang; Thorsten Mauritsen

2010-07-01T23:59:59.000Z

359

The Amazon Boundary-Layer Experiment (ABLE 2B): A Meteorological Perspective  

Science Conference Proceedings (OSTI)

In July and August 1985, and April and May 1987, two atmospheric chemistry field experiments called the Amazon Boundary-layer Experiments, (ABLE 2A and 2B) were conducted from a base near Manaus, Brazil in the central Amazon basin. The ...

Michael Garstang; Steven Greco; John Scala; Robert Swap; Stanley Ulanski; David Fitzjarrald; David Martin; Edward Browell; Mark Shipman; Vickie Connors; Robert Harriss; Robert Talbot

1990-01-01T23:59:59.000Z

360

A Mean-Gradient Model of the Dry Convective Boundary Layer  

Science Conference Proceedings (OSTI)

A mean-gradient model of the dry convective boundary layer is developed using a convective mass flux representation of the turbulent fluxes. A top-hat model of thermals is used to represent the average characteristics of updrafts and downdrafts ...

Shouping Wang; Bruce A. Albrecht

1990-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Observations of the Nocturnal Boundary Layer Associated with the West African Monsoon  

Science Conference Proceedings (OSTI)

A set of nighttime tethered balloon and kite measurements from the central Sahel (15.2°N, 1.3°W) in August 2005 were acquired and analyzed. A composite of all the nights’ data was produced using boundary layer height to normalize measured ...

Caroline L. Bain; Douglas J. Parker; Christopher M. Taylor; Laurent Kergoat; Françoise Guichard

2010-08-01T23:59:59.000Z

362

Mechanisms for Diurnal Boundary Layer Circulations in the Great Basin Desert  

Science Conference Proceedings (OSTI)

The purpose of this observation- and model-based study of the Great Basin Desert boundary layer is to illustrate the variety of locally forced circulations that can affect such an area during a diurnal cycle. The area of the Great Basin Desert (...

Daran L. Rife; Thomas T. Warner; Fei Chen; Elford G. Astling

2002-04-01T23:59:59.000Z

363

An overview on the Urban Boundary-layer Atmosphere Network in Helsinki  

Science Conference Proceedings (OSTI)

Helsinki UrBAN (Urban Boundary-layer Atmosphere Network, http://urban.fmi.fi) is a dedicated research-grade observational network where we study the physical processes in the atmosphere above the city. Helsinki UrBAN is the most poleward intensive urban ...

Wood CR; Järvi L; Kouznetsov RD; Nordbo A; Joffre S; Drebs A; Vihma T; Hirsikko A; Suomi I; Fortelius C; O'Connor E; Moiseev D; Haapanala S; Moilanen J; Kangas M; Karppinen A; Vesala T; Kukkonen J

364

Lidar Investigation of Tropical Nocturnal Boundary Layer Aerosols and Cloud Macrophysics  

SciTech Connect

Observational evidence of two-way association between nocturnal boundary layer aerosols and cloud macrophysical properties under different meteorological conditions is reported in this paper. The study has been conducted during 2008-09 employing a high space-time resolution polarimetric micro-pulse lidar over a tropical urban station in India. Firstly, the study highlights the crucial role of boundary layer aerosols and background meteorology on the formation and structure of low-level stratiform clouds in the backdrop of different atmospheric stability conditions. Turbulent mixing induced by the wind shear at the station, which is associated with a complex terrain, is found to play a pivotal role in the formation and structural evolution of nocturnal boundary layer clouds. Secondly, it is shown that the trapping of energy in the form of outgoing terrestrial radiation by the overlying low-level clouds can enhance the aerosol mixing height associated with the nocturnal boundary layer. To substantiate this, the long-wave heating associated with cloud capping has been quantitatively estimated in an indirect way by employing an Advanced Research Weather Research and Forecasting (WRF-ARW) model version 2.2 developed by National Center for Atmospheric Research (NCAR), Colorado, USA, and supplementary data sets; and differentiated against other heating mechanisms. The present investigation as well establishes the potential of lidar remote-sensing technique in exploring some of the intriguing aspects of the cloud-environment relationship.

Manoj, M. G.; Devara, PC S.; Taraphdar, Sourav

2013-10-01T23:59:59.000Z

365

The Three-Dimensional Structure and Evolution of a Tornado Boundary Layer  

Science Conference Proceedings (OSTI)

The finescale three-dimensional structure and evolution of the near-surface boundary layer of a tornado (TBL) is mapped for the first time. The multibeam Rapid-Scan Doppler on Wheels (RSDOW) collected data at several vertical levels, as low as 4, ...

Karen A. Kosiba; Joshua Wurman

2013-12-01T23:59:59.000Z

366

Local Versus Nonlocal Boundary-Layer Diffusion in a Global Climate Model  

Science Conference Proceedings (OSTI)

The results of a local and a nonlocal scheme for vertical diffusion in the atmospheric boundary layer are compared within the context of a global climate model. The global model is an updated version of the NCAR Community Climate Model (CCM2). ...

A. A. M. Holtslag; B. A. Boville

1993-10-01T23:59:59.000Z

367

An Overview of the Urban Boundary Layer Atmosphere Network in Helsinki  

Science Conference Proceedings (OSTI)

The Helsinki Urban Boundary-Layer Atmosphere Network (UrBAN: http://urban.fmi.fi) is a dedicated research-grade observational network where the physical processes in the atmosphere above the city are studied. Helsinki UrBAN is the most poleward intensive ...

C. R. Wood; L. Järvi; R. D. Kouznetsov; A. Nordbo; S. Joffre; A. Drebs; T. Vihma; A. Hirsikko; I. Suomi; C. Fortelius; E. O'Connor; D. Moiseev; S. Haapanala; J. Moilanen; M. Kangas; A. Karppinen; T. Vesala; J. Kukkonen

2013-11-01T23:59:59.000Z

368

A PDF-Based Model for Boundary Layer Clouds. Part I: Method and Model Description  

Science Conference Proceedings (OSTI)

A new cloudy boundary layer single-column model is presented. It is designed to be flexible enough to represent a variety of cloudiness regimes—such as cumulus, stratocumulus, and clear regimes—without the need for case-specific adjustments. The ...

Jean-Christophe Golaz; Vincent E. Larson; William R. Cotton

2002-12-01T23:59:59.000Z

369

A PDF-Based Model for Boundary Layer Clouds. Part II: Model Results  

Science Conference Proceedings (OSTI)

A new single-column model for the cloudy boundary layer, described in a companion paper, is tested for a variety of regimes. To represent the subgrid-scale variability, the model uses a joint probability density function (PDF) of vertical ...

Jean-Christophe Golaz; Vincent E. Larson; William R. Cotton

2002-12-01T23:59:59.000Z

370

Sea-Breeze Circulation over Jakarta, Indonesia: A Climatology Based on Boundary Layer Radar Observations  

Science Conference Proceedings (OSTI)

Characteristics of sea-breeze circulation over the tropical site of Jakarta, Indonesia, have been documented based on analyses of satellite images and data from long-term L-band boundary layer radar measurements carried out at Serpong (6.4°S, ...

Tri W. Hadi; T. Horinouchi; T. Tsuda; H. Hashiguchi; S. Fukao

2002-09-01T23:59:59.000Z

371

Horizontal Roll and Boundary-Layer Interrelationships Observed over Lake Michigan  

Science Conference Proceedings (OSTI)

On 7, 9 and 10 January 1981 some 35 hours of organized horizontal roll convection in the boundary layer over lake Michigan were probed with two airplanes and two radars from the University of Chicago Lake Snow Project. During this time, roll ...

Robert D. Kelly

1984-06-01T23:59:59.000Z

372

Boundary-Layer Structure Over Tropical Oceans from TIROS-N Infrared Sounder Observations  

Science Conference Proceedings (OSTI)

It has been shown by simulation studies that the 13.4, 11.1 and 8.3 ?m spectral radiances are sensitive to the moisture distribution within the boundary layer. If the distribution gets significantly perturbed due to some stratification present in ...

Vijay K. Agarwal; A. V. Ashajayanthi

1983-07-01T23:59:59.000Z

373

Can an E–l Turbulence Closure Simulate Entrainment in Radiatively Driven Convective Boundary Layers?  

Science Conference Proceedings (OSTI)

The simulation of entrainment by an (E–l) turbulent kinetic energy–diagnostic length scale closure model is investigated in a smoke cloud convective boundary layer. The behavior of the E–l scheme is compared with two simple entrainment closures ...

Geert Lenderink; Margreet C. vanZanten; Peter G. Duynkerke

1999-09-01T23:59:59.000Z

374

On the Structure of Turbulence in the Bottom Boundary Layer of the Coastal Ocean  

Science Conference Proceedings (OSTI)

Six sets of particle image velocimetry (PIV) data from the bottom boundary layer of the coastal ocean are examined. The data represent periods when the mean currents are higher, of the same order, and much weaker than the wave-induced motions. ...

W. A. M. Nimmo Smith; J. Katz; T. R. Osborn

2005-01-01T23:59:59.000Z

375

Stable Boundary Layer Depth from High-Resolution Measurements of the Mean Wind Profile  

Science Conference Proceedings (OSTI)

The depth h of the stable boundary layer (SBL) has long been an elusive measurement. In this diagnostic study the use of high-quality, high-resolution (?z = 10 m) vertical profile data of the mean wind U(z) and streamwise variance ?u2(z) is ...

Yelena L. Pichugina; Robert M. Banta

2010-01-01T23:59:59.000Z

376

The Very Stable Boundary Layer on Nights with Weak Low-Level Jets  

Science Conference Proceedings (OSTI)

The light-wind, clear-sky, very stable boundary layer (vSBL) is characterized by large values of bulk Richardson number. The light winds produce weak shear, turbulence, and mixing, and resulting strong temperature gradients near the surface. Here ...

Robert M. Banta; Larry Mahrt; Dean Vickers; Jielun Sun; Ben B. Balsley; Yelena L. Pichugina; Eric J. Williams

2007-09-01T23:59:59.000Z

377

A Model for Objective Simulation of Boundary-Layer Winds in an Area of Complex Terrain  

Science Conference Proceedings (OSTI)

An objective analysis model is formulated to simulate the boundary-layer wind field in an area of complex terrain on the island of Oahu, Hawaii. The model is designed to reproduce the effects of the terrain on the undisturbed trade wind flow in ...

D. André Erasmus

1986-12-01T23:59:59.000Z

378

A six-year climatology of fronts affecting Helsinki, Finland and their boundary layer structure  

Science Conference Proceedings (OSTI)

A six-year climatology of the frequency, characteristics, and boundary-layer structure of synoptic-scale fronts in Helsinki, Finland was created using significant weather charts and observations from a 327 m tall mast and from the Station for ...

Victoria A. Sinclair

379

Doppler Radar Observations of the Development of a Boundary-Layer Nocturnal Jet  

Science Conference Proceedings (OSTI)

A single Doppler radar obtained detailed clear-air measurements of the development of a strong boundary-layer nocturnal jet in North Dakota during the summer of 1989. The evolution of the jet was monitored by the radar with a high degree of ...

A. Shelby Frisch; Brad W. Orr; Brooks E. Martner

1992-01-01T23:59:59.000Z

380

Very simple, carbuncle-free, boundary-layer-resolving, rotated-hybrid Riemann solvers  

Science Conference Proceedings (OSTI)

In this paper, we propose new Euler flux functions for use in a finite-volume Euler/Navier-Stokes code, which are very simple, carbuncle-free, yet have an excellent boundary-layer-resolving capability, by combining two different Riemann solvers into ... Keywords: Carbuncle, Hybrid schemes, Rotated Riemann solvers, Shock instability, Upwind schemes

Hiroaki Nishikawa; Keiichi Kitamura

2008-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Observed Characteristics of the Afternoon–Evening Boundary Layer Transition Based on Sodar and Surface Data  

Science Conference Proceedings (OSTI)

The early-evening boundary layer transition has been defined in the past using a variety of criteria, the most popular of which is the onset of a negative surface heat flux. According to this definition, the transition is an almost-instantaneous ...

Jessica Busse; Kevin Knupp

2012-03-01T23:59:59.000Z

382

Stable Atmospheric Boundary Layers and Diurnal Cycles: Challenges for Weather and Climate Models  

Science Conference Proceedings (OSTI)

The representation of the atmospheric boundary layer is an important part of weather and climate models and impacts many applications such as air quality and wind energy. Over the years, the performance in modeling 2-m temperature and 10-m wind speed has ...

A. A. M. Holtslag; G. Svensson; P. Baas; S. Basu; B. Beare; A. C. M. Beljaars; F. C. Bosveld; J. Cuxart; J. Lindvall; G. J. Steeneveld; M. Tjernström; B. J. H. Van De Wiel

2013-11-01T23:59:59.000Z

383

Evaluation of Three Planetary Boundary Layer Schemes in the WRF Model XIAO-MING HU  

E-Print Network (OSTI)

of air from above the PBL. A sensitivity experiment with the ACM2 scheme confirms this diagnosis. 1 the planetary boundary layer (PBL), is important for air pollution modeling, and PBL parameterization schemes­Yamada­Janjic (MYJ), Yonsei University (YSU), and the asymmetric convective model, version 2 (ACM2)]. Comparison

384

Evaluation of Planetary Boundary Layer Scheme Sensitivities for the Purpose of Parameter Estimation  

E-Print Network (OSTI)

for the parameters within the Asymmetrical Convective Model, version 2 (ACM2) planetary boundary layer (PBL) scheme of the simulations to these 10 particular ACM2 parameters within their plausible physical bounds. The most Appropriate treatment of vertical mixing is an essen- tial component of meteorological and air quality models

385

The Structure of a Fair Weather Boundary Layer Based on the Results of Several Measurement Strategies  

Science Conference Proceedings (OSTI)

A fair weather boundary layer (BL) with light winds and scattered cumulus to 1100 m is examined in the GATE C-scale triangle using data from tethered balloons, surface measurements from the booms of the ships, structure sondes and gust probe ...

Gary Barnes; George D. Emmitt; Burghard Brummer; Margaret A. LeMone; Stephen Nicholls

1980-03-01T23:59:59.000Z

386

Simulation of a Stratocumulus-Topped Planetary Boundary Layer: Intercomparison among Different Numerical Codes  

Science Conference Proceedings (OSTI)

This paper reports an intercomparison study of a stratocumulus-topped planetary boundary layer (PBL) generated from ten 3D large eddy simulation (LES) codes and four 2D cloud-resolving models (CRMs). These models vary in the numerics, the ...

C-H. Moeng; W. R. Cotton; B. Stevens; C. Bretherton; H. A. Rand; A. Chlond; M. Khairoutdinov; S. Krueger; W. S. Lewellen; M. K. MacVean; J. R. M. Pasquier; A. P. Siebesma; R. I. Sykes

1996-02-01T23:59:59.000Z

387

Transport and Resuspension of Fine Particles in a Tidal Boundary Layer near a Small Peninsula  

Science Conference Proceedings (OSTI)

The authors present a theory on the transport and resuspension of fine particles in a tidal boundary layer when the ambient tidal flow is nonuniform due to a peninsula along the coastline. As a first step toward better physical understanding the ...

Chiang C. Mei; Chimin Chian; Feng Ye

1998-11-01T23:59:59.000Z

388

Cyclonic Spirals in Tidally Accelerating Bottom Boundary Layers in the Zhujiang (Pearl River) Estuary  

Science Conference Proceedings (OSTI)

A velocity spiral in the tidally accelerating bottom boundary layer (BBL) was defined as a directional shear of the prevailing flow with the elevation and the tidal phase. However, so far there is no information on the spiral for the oscillatory ...

Jiaxue Wu; Huan Liu; Jie Ren; Junjie Deng

2011-06-01T23:59:59.000Z

389

Measurement of Turbulence in the Oceanic Bottom Boundary layer with an Acoustic Current Meter Array  

Science Conference Proceedings (OSTI)

A vertical array of acoustic current meters measures the vector flow field in the lowest 5 m of the oceanic boundary layer. By resolving the velocity to 0.03 cm s?1 over 15 cm paths, it samples the dominant turbulent eddies responsible for ...

Albert J. Williams 3rd; John S. Tochko; Richard L. Koehler; William D. Grant; Thomas F. Gross; Christopher V. R. Dunn

1987-06-01T23:59:59.000Z

390

Effect of wave boundary layer on sea-to-air dimethylsulfide transfer velocity during typhoon passage  

E-Print Network (OSTI)

: Dimethylsulfide; Sea-to-air gas transfer velocity; Wave boundary layer; Tropical cyclone; Drag coefficient in order to accurately calculate aerosol radiative forcing. The sea-to-air DMS flux depends on airside coefficient CD and roughness length z0 has been investigated over small areas of the sea or in wave tanks

Chu, Peter C.

391

The IMADA-AVER Boundary Layer Experiment in the Mexico City Area  

Science Conference Proceedings (OSTI)

A boundary layer field experiment in the Mexico City basin during the period 24 February–22 March 1997 is described. A total of six sites were instrumented. At four of the sites, 915-MHz radar wind profilers were deployed and radiosondes were ...

J. C. Doran; X. Bian; S. F. J. de Wekker; S. Edgerton; J. D. Fast; J. M. Hubbe; W. J. Shaw; C. D. Whiteman; S. Abbott; C. King; J. Leach; M. Mulhearn; C. Russell; B. Templeman; D. Wolfe; J. Archuleta; S. Elliott; A. Fernandez; D. Langley; J. T. Lee; W. Porch; L. Tellier; J. Chow; J. G. Watson; R. L. Coulter; T. J. Martin; J. D. Shannon; R. White; D. Martinez; J. L. Martinez; V. Mora; G. Sosa; G. Mercado; J. L. Pena; R. Salas; R. Petty

1998-11-01T23:59:59.000Z

392

The Vertical Distribution of Radon in Clear and Cloudy Daytime Terrestrial Boundary Layers  

Science Conference Proceedings (OSTI)

Radon (222Rn) is a powerful natural tracer of mixing and exchange processes in the atmospheric boundary layer. The authors present and discuss the main features of a unique dataset of 50 high-resolution vertical radon profiles up to 3500 m above ...

Alastair G. Williams; Wlodek Zahorowski; Scott Chambers; Alan Griffiths; Jörg M. Hacker; Adrian Element; Sylvester Werczynski

2011-01-01T23:59:59.000Z

393

Comparative Evaluation of Eddy Exchange Coefficients for Strong and Weak Wind Stable Boundary Layer Modeling  

Science Conference Proceedings (OSTI)

Five local K-closure formulations and a TKE closure were incorporated in a one-dimensional version of the Pielke’s model, and a comparative evaluation of the closure schemes was made for strong and weak wind stable boundary layer (SBL). The ...

Maithili Sharan; S. G. Gopalakrishnan

1997-05-01T23:59:59.000Z

394

The Minimum Wind Speed for Sustainable Turbulence in the Nocturnal Boundary Layer  

Science Conference Proceedings (OSTI)

The collapse of turbulence in the nocturnal boundary layer is studied by means of a simple bulk model that describes the basic physical interactions in the surface energy balance. It is shown that for a given mechanical forcing, the amount of ...

B. J. H. Van de Wiel; A. F. Moene; H. J. J. Jonker; P. Baas; S. Basu; J. M. M. Donda; J. Sun; A. A. M. Holtslag

2012-11-01T23:59:59.000Z

395

The Coastal Bottom Boundary Layer: A Note on the Model of Chapman and Lentz  

Science Conference Proceedings (OSTI)

The bottom boundary layer of a stratified flow on a coastal continental shelf is examined using the model of Chapman and Lentz. The flow is driven by a surface stress, uniform in the alongshore coordinate, in a downwelling-favorable direction. ...

Joseph Pedlosky

2007-11-01T23:59:59.000Z

396

Trapping of a Coastal Density Front by the Bottom Boundary Layer  

Science Conference Proceedings (OSTI)

The dynamics of a surface-to-bottom density front on a uniformly sloping continental shelf and the role of density advection in the bottom boundary layer are examined using a three-dimensional, primitive equation numerical model. The front is ...

David C. Chapman; Steven J. Lentz

1994-07-01T23:59:59.000Z

397

Rolls, Streets, Waves, and More: A Review of Quasi-Two-Dimensional Structures in the Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

The atmospheric boundary layer is home to a number of horizontally elongated quasi-two-dimensionalphenomena including cloud streets, roll vortices, thermal waves, and surface layer streaks. These phenomena, their dynamics, and their interactions ...

George S. Young; David A. R. Kristovich; Mark R. Hjelmfelt; Ralph C. Foster

2002-07-01T23:59:59.000Z

398

Turbulence Structure of the Convective Boundary Layer. Part II. Phonenix 78 Aircraft Observations of Thermals and Their Environment  

Science Conference Proceedings (OSTI)

A conditional sampling technique based upon the mixed layer spectra of vertical velocity and temperature is developed. This technique is used to analyze the turbulence data obtained by aircraft during the Phoenix 78 convective boundary layer ...

George S. Young

1988-02-01T23:59:59.000Z

399

The Extrapolation of Vertical Profiles of Wind Speed within the Marine Atmospheric Surface layer Using the p Formula  

Science Conference Proceedings (OSTI)

Values of p for the exponent-type wind profile formulation, used in vertical extrapolations of wind speed, were derived for the marine atmospheric surface layer. Nomograms were constructed providing p values as dependent on a single elevation ...

M. Segal; R. A. Pielke

1988-02-01T23:59:59.000Z

400

Similarity Relationships in the Marine Atmospheric Surface Layer for Terms in the TKE and Scalar Variance Budgets  

Science Conference Proceedings (OSTI)

Measurements of the momentum, heat, moisture, energy, and scalar variance fluxes are combined with dissipation estimates to investigate the behavior of marine surface layer turbulence. These measurements span a wide range of atmospheric stability ...

J. B. Edson; C. W. Fairall

1998-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Posters Triggering of Boundary Layer Cumulus Clouds Over a Heterogeneous Surface  

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

5 5 Posters Triggering of Boundary Layer Cumulus Clouds Over a Heterogeneous Surface K. Schrieber, R. Stull, and Q. Zhang Boundary Layer Research Team Department of Atmospheric and Oceanic Science University of Wisconsin Madison, Wisconsin Complex multimodal joint frequency distributions of LCL height versus θ v in surface-layer air over a large heteroge- neous surface area are modeled as the superposition of simpler mono-modal distributions. These simpler distri- butions, which apply to quasi-homogeneous subdomains, are approximated with bivariate distribution models. The shape of each of these modeled distributions depends on variations of the Bowen ratio and heat input forcings. These forcings are a function of the landscape, insolation, surface albedo, cloud-shading, soil moisture, and other

402

Cloud Droplet Residual Particle Microphysics in Marine Stratocumulus Clouds Observed during the Monterey Area Ship Track Experiment  

Science Conference Proceedings (OSTI)

The effect of marine boundary layer pollution level (as determined by the aerosol particle number concentration) on the size distribution of aerosol particles that formed cloud droplets in marine stratiform clouds is examined. In situ ...

Elisabeth Öström; Kevin J. Noone; Robert A. Pockalny

2000-08-01T23:59:59.000Z

403

Evaluating the Performance of Planetary Boundary Layer and Cloud Microphysical Parameterization Schemes in Convection-Permitting Ensemble Forecasts using  

E-Print Network (OSTI)

uncertainty in how to include various processes (e.g., drop breakup and ice-phase categories 1 Evaluating the Performance of Planetary Boundary Layer and Cloud Microphysical Parameterization In this study, the ability of several cloud microphysical and planetary boundary layer parameterization schemes

Xue, Ming

404

Modeling the Evolution of the Atmospheric Boundary Layer Coupled to the Land Surface for Three Contrasting Nights in CASES-99  

Science Conference Proceedings (OSTI)

The modeling and prediction of the stable boundary layer over land is a persistent, problematic feature in weather, climate, and air quality topics. Here, the performance of a state-of-the-art single-column boundary layer model is evaluated with ...

G. J. Steeneveld; B. J. H. van de Wiel; A. A. M. Holtslag

2006-03-01T23:59:59.000Z

405

Climatology of a Summer Coastal Boundary Layer with 1290-MHz Wind Profiler Radar and a WRF Simulation  

Science Conference Proceedings (OSTI)

A study of the Israeli summer coastal boundary layer (BL) with a 1290-MHz wind profiler located 3.5 km from the coastline has revealed four main features associated with the sea-breeze onset: 1) by midday the boundary layer height drops by an ...

Yoav Levi; Elad Shilo; Ilan Setter

2011-09-01T23:59:59.000Z

406

Non-local closure model for vertical mixing in the convective boundary layer  

Science Conference Proceedings (OSTI)

A simple non-local closure model for vertical mixing in Convective Boundary Layers (CBL) has been developed specifically for application in regional or meso-scale atmospheric chemistry models. The model, named the Asymmetrical Convective Model (ACM), is based on the concept that vertical transport within the CBL is inherently asymmetrical. Upward transport by buoyant plumes originating in the surface layer is simulated by mixing from the lowest model layer directly to all other layers in the CBL. Downward transport, however, proceeds only to the next lower layer in order to emulate gradual compensatory subsidence. The realism of the ACM is tested through comparisons to large-eddy simulations of several idealized test cases. The ACM is also tested in the context of the Regional Acid Deposition Model (RADM) both to determine sensitivity to different CBL mixing schemes and to compare to vertically resolved aircraft measurements. These tests demonstrate quicker upward transport of ground level emissions by the ACM as compared to the eddy diffusion scheme currently used in RADM. The ACM also affects ozone photochemistry in the boundary layer resulting in lower ozone concentrations in areas of high NOx emissions.

Pleim, J.E.; Chang, J.S.

1993-01-01T23:59:59.000Z

407

Marine Downscaling of a Future Climate Scenario for Australian Boundary Currents  

Science Conference Proceedings (OSTI)

Ocean boundary currents are poorly represented in existing coupled climate models, partly because of their insufficient resolution to resolve narrow jets. Therefore, there is limited confidence in the simulated response of boundary currents to ...

Chaojiao Sun; Ming Feng; Richard J. Matear; Matthew A. Chamberlain; Peter Craig; Ken R. Ridgway; Andreas Schiller

2012-04-01T23:59:59.000Z

408

Four-Dimensional Data Assimilation Boundary-Layer Observations Over the Southern  

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

Boundary-Layer Observations Over the Southern Boundary-Layer Observations Over the Southern Great Plains Cloud and Radiation Testbed Site During the November Flux-Profiler Test s. P. Oncley and J. Van Baelen National Center for Atmospheric Research(8) Boulder, CO 80307-3000 Introduction Resu Its Figure 1 shows the raw data from two of the ten profile patterns flown during this experiment. Each aircraft profile consisted of a descent to the profiler site followed by 3-5 legs at increasing heights. Note that because of this flightpattern, the downward and upward profiles may differ due to temporal changes during the time of the pattern (about 50 minutes) and due to horizontal gradients. The profiler was operated in DBS mode alternating between two sets of three beams. Thus, two sets of consensus- averaged winds were available. Finally, several

409

Numerical study of boundary layer injection as a scale control method  

DOE Green Energy (OSTI)

A boundary layer injection method of controlling scale-buildup in geothermal two-phase flow nozzles is studied. The object of this study is to set an upper limit on the ratio of the injected mass flow rate to the free stream mass flow rate that is necessary to isolate the scale carrying free stream flow from the nozzle wall. In order to develop a numerical model of the boundary layer flow, assumptions are made which reduce the results to order of magnitude approximations. Two configurations of nozzles with various injection flow rates are tried. It is found by numerical experiment that a nozzle with injection through a 1 mm thick ring near the inlet, is more efficient at isolating the free stream than a porous nozzle. A mass flow rate ratio of 0.173% was necessary to achieve this effect. It may be concluded that an upper limit on the mass flow rate ratio is about 2.0% with injection through a ring near the inlet, and that boundary layer injection is a reasonable method of controlling scale-buildup. A glossary of variables, program documentation and listings are presented for programs GMD15SR8, TRACK11, and TRACK12.

Feiereisen, W.

1975-09-26T23:59:59.000Z

410

Cancellation of Aerosol Indirect Effects in Marine Stratocumulus through Cloud Thinning  

Science Conference Proceedings (OSTI)

Applying perturbation theory within a mixed layer framework, the response of the marine boundary layer (MBL) cloud thickness h to imposed increases of the cloud droplet concentration Nd as a surrogate for increases in cloud condensation nuclei (...

Robert Wood

2007-07-01T23:59:59.000Z

411

Numerical and Laboratory Study of a Horizontally Evolving Convective Boundary Layer. Part I: Transition Regimes and Development of the Mixed Layer  

Science Conference Proceedings (OSTI)

Results are presented from a large eddy simulation (LES) and wind tunnel study of the turbulence regime in a horizontally evolving sheared atmospheric convective boundary layer (CBL) capped by a temperature inversion. The wind tunnel part of the ...

E. Fedorovich; F. T. M. Nieuwstadt; R. Kaiser

2001-01-01T23:59:59.000Z

412

Observations of the Evolution of the Nocturnal and Convective Boundary Layers and the Structure of Open-Celled Convection on 14 June 2002  

Science Conference Proceedings (OSTI)

The Boundary Layer Evolution (BLE) missions of the International H2O Project (IHOP_2002) were designed to provide comprehensive observations of the distribution of water vapor in the quiescent boundary layer and its evolution during the early ...

Lindsay J. Bennett; Tammy M. Weckwerth; Alan M. Blyth; Bart Geerts; Qun Miao; Yvette P. Richardson

2010-07-01T23:59:59.000Z

413

Evolution of the lower planetary boundary layer over strongly contrasting surfaces  

SciTech Connect

In a multilaboratory field study held near Boardman in northeastern Oregon in June 1991, various properties of the surface and lower atmospheric boundary layer over heavily irrigated cropland and adjacent desert steppe were investigated in the initial campaign of the Atmospheric Radiation Measurement (ARM) program. The locale was selected because its disparate characteristics over various spatial scales stress the ability of general circulation models (GCMS) to describe lower boundary conditions, particularly across the discontinuity between desert (in which turbulent flux of heat must be primarily as sensible heat) and large irrigated tracts (in which turbulent flux of latent heat should be the larger term). This campaign of ARM seeks to increase knowledge in three critical areas: (1) determination of the relationships between surface heat fluxes measured over multiple scales and the controlling surface parameters within each scale, (2) integration of local and nearly local heat flux estimates to produce estimates appropriate for GCM grid cells of 100-200 km horizontal dimension, and (3) characterization of the growth and development of the atmospheric boundary layer near transitions between surfaces with strongly contrasting moisture availabilities.

Coulter, R.L.; Gao, W.; Martin, T.J.; Shannon, J.D. [Argonne National Lab., IL (United States); Doran, J.C.; Hubbe, J.M.; Shaw, W.M. [Pacific Northwest Lab., Richland, WA (United States)

1992-12-31T23:59:59.000Z

414

Evolution of the lower planetary boundary layer over strongly contrasting surfaces  

SciTech Connect

In a multilaboratory field study held near Boardman in northeastern Oregon in June 1991, various properties of the surface and lower atmospheric boundary layer over heavily irrigated cropland and adjacent desert steppe were investigated in the initial campaign of the Atmospheric Radiation Measurement (ARM) program. The locale was selected because its disparate characteristics over various spatial scales stress the ability of general circulation models (GCMS) to describe lower boundary conditions, particularly across the discontinuity between desert (in which turbulent flux of heat must be primarily as sensible heat) and large irrigated tracts (in which turbulent flux of latent heat should be the larger term). This campaign of ARM seeks to increase knowledge in three critical areas: (1) determination of the relationships between surface heat fluxes measured over multiple scales and the controlling surface parameters within each scale, (2) integration of local and nearly local heat flux estimates to produce estimates appropriate for GCM grid cells of 100-200 km horizontal dimension, and (3) characterization of the growth and development of the atmospheric boundary layer near transitions between surfaces with strongly contrasting moisture availabilities.

Coulter, R.L.; Gao, W.; Martin, T.J.; Shannon, J.D. (Argonne National Lab., IL (United States)); Doran, J.C.; Hubbe, J.M.; Shaw, W.M. (Pacific Northwest Lab., Richland, WA (United States))

1992-01-01T23:59:59.000Z

415

Distribution of Energy Spectra, Reynolds Stresses, Turbulence Production, and Dissipation in a Tidally Driven Bottom Boundary Layer  

Science Conference Proceedings (OSTI)

Seven sets of 2D particle image velocimetry data obtained in the bottom boundary layer of the coastal ocean along the South Carolina and Georgia coast [at the South Atlantic Bight Synoptic Offshore Observational Network (SABSOON) site] are ...

L. Luznik; W. Zhu; R. Gurka; J. Katz; W. A. M. Nimmo Smith; T. R. Osborn

2007-06-01T23:59:59.000Z

416

An Observational and Modeling Study of Characteristics of Urban Heat Island and Boundary Layer Structures in Beijing  

Science Conference Proceedings (OSTI)

In this paper, the characteristics of urban heat island (UHI) and boundary layer structures in the Beijing area, China, are analyzed using conventional and Moderate Resolution Imaging Spectroradiometer (MODIS) observations. The Weather Research ...

Shiguang Miao; Fei Chen; Margaret A. LeMone; Mukul Tewari; Qingchun Li; Yingchun Wang

2009-03-01T23:59:59.000Z

417

The Interaction between an Internal Gravity Wave and Turbulence in the Stably-Stratified Nocturnal Boundary Layer  

Science Conference Proceedings (OSTI)

Observations have been made of a stably-stratified nighttime boundary layer perturbed by Kelvin-Helmholtz internal waves with critical levels around 600 m. Significant turbulence intensities were measured although the time-mean gradient ...

J. J. Finnigan; F. Einaudi; D. Fua

1984-08-01T23:59:59.000Z

418

Evaluation of an LES-Based Wind Profiler Simulator for Observations of a Daytime Atmospheric Convective Boundary Layer  

Science Conference Proceedings (OSTI)

The daytime atmospheric convective boundary layer (CBL) is characterized by strong turbulence that is primarily caused by buoyancy forced from the heated underlying surface. The present study considers a combination of a virtual radar and large ...

Danny E. Scipión; Phillip B. Chilson; Evgeni Fedorovich; Robert D. Palmer

2008-08-01T23:59:59.000Z

419

A Finite-Element Model of the Atmospheric Boundary Layer Suitable for Use with Numerical Weather Prediction Models  

Science Conference Proceedings (OSTI)

We give a detailed description of an atmospheric boundary layer model capable of simulating the diurnal cycles of wind, temperature and humidity. The model includes a formulation of various physical processes (radiative effects, variation of soil ...

J. Mailhot; R. Benoit

1982-10-01T23:59:59.000Z

420

Simulation of Boundary Layer Structure over the Indian Summer Monsoon Trough during the Passage of a Depression  

Science Conference Proceedings (OSTI)

The planetary boundary layer (PBL) structure over the Indian summer monsoon trough region has been simulated using a regional numerical model during the passage of a monsoon depression along the monsoon trough. Monin–Obukhov similarity theory for ...

K. V. J. Potty; U. C. Mohanty; S. Raman

2001-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

The Effect of Mesh Resolution on Convective Boundary Layer Statistics and Structures Generated by Large-Eddy Simulation  

Science Conference Proceedings (OSTI)

A massively parallel large-eddy simulation (LES) code for planetary boundary layers (PBLs) that utilizes pseudospectral differencing in horizontal planes and solves an elliptic pressure equation is described. As an application, this code is used ...

Peter P. Sullivan; Edward G. Patton

2011-10-01T23:59:59.000Z

422

The Effects of Nonhomogeneous Surface Fluxes on the Convective Boundary Layer: A Case Study Using Large-Eddy Simulation  

Science Conference Proceedings (OSTI)

Most land surfaces are quasi-randomly nonhomogeneous, yet most boundary-layer studies assume homogeneous or simply varying surface conditions. In this study, nonhomogeneous surface fluxes of realistic scale and amplitude are applied to a large-...

Leslie M. Hechtel; Roland B. Stul; Chin-Hoh Moeng

1990-07-01T23:59:59.000Z

423

A Study of the Urban Boundary Layer Using Different Urban Parameterizations and High-Resolution Urban Canopy Parameters with WRF  

Science Conference Proceedings (OSTI)

In the last two decades, mesoscale models (MMs) with urban canopy parameterizations have been widely used to study urban boundary layer processes. Different studies show that such parameterizations are sensitive to the urban canopy parameters (...

Francisco Salamanca; Alberto Martilli; Mukul Tewari; Fei Chen

2011-05-01T23:59:59.000Z

424

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

425

The Modification of Bottom Boundary Layer Turbulence and Mixing by Internal Waves Shoaling on a Barrier Reef  

Science Conference Proceedings (OSTI)

Results are presented from an observational study of stratified, turbulent flow in the bottom boundary layer on the outer southeast Florida shelf. Measurements of momentum and heat fluxes were made using an array of acoustic Doppler velocimeters ...

Kristen A. Davis; Stephen G. Monismith

2011-11-01T23:59:59.000Z

426

The Vertical Structure of the Wave Bottom Boundary Layer over a Sloping Bed: Theory and Field Measurements  

Science Conference Proceedings (OSTI)

Theoretical solutions for the wave bottom boundary layer (WBL) over a sloping bed are compared with field measurements in the nearshore zone. The WBL theory is constructed using both viscoelastic–diffusion and conventional eddy viscosity ...

Qingping Zou; Alex E. Hay

2003-07-01T23:59:59.000Z

427

Air–Sea Exchange in Hurricanes: Synthesis of Observations from the Coupled Boundary Layer Air–Sea Transfer Experiment  

Science Conference Proceedings (OSTI)

The Coupled Boundary Layer Air–Sea Transfer (CBLAST) field program, conducted from 2002 to 2004, has provided a wealth of new air–sea interaction observations in hurricanes. The wind speed range for which turbulent momentum and moisture exchange ...

Peter G. Black; Eric A. D'Asaro; Thomas B. Sanford; William M. Drennan; Jun A. Zhang; Jeffrey R. French; Pearn P. Niiler; Eric J. Terrill; Edward J. Walsh

2007-03-01T23:59:59.000Z

428

Response of an Oceanic Bottom Boundary Layer on a Slope to Interior Flow. Part I: Time-Independent Interior Flow  

Science Conference Proceedings (OSTI)

The behavior of oceanic boundary layers on a sloping bottom in the presence of stratification is investigated by the method of direct numerical simulations. The Navier–Stokes equations are decomposed into mean and turbulent components with the ...

Dave Ramsden

1995-07-01T23:59:59.000Z

429

Cell Merger Potential in Multicell Thunderstorms of Weakly Sheared Environments: Cell Separation Distance versus Planetary Boundary Layer Depth  

Science Conference Proceedings (OSTI)

Using high-resolution three-dimensional numerical experiments, this paper shows that the cell separation distance scales as 0.75 times the planetary boundary layer (PBL) depth for successful cell mergers between constructively interacting cells ...

James R. Stalker; Kevin R. Knupp

2003-08-01T23:59:59.000Z

430

A Method for Estimating Planetary Boundary Layer Heights and Its Application over the ARM Southern Great Plains Site  

Science Conference Proceedings (OSTI)

A new objective method to determine the height of the planetary boundary layer (PBL) is presented here. PBL heights are computed using the statistical variance and kurtosis of dewpoint and virtual potential temperature differences measured from ...

Paul Schmid; Dev Niyogi

2012-03-01T23:59:59.000Z

431

Turbulent Velocity-Variance Profiles in the Stable Boundary Layer Generated by a Nocturnal Low-Level Jet  

Science Conference Proceedings (OSTI)

Profiles of mean winds and turbulence were measured by the High Resolution Doppler lidar in the strong-wind stable boundary layer (SBL) with continuous turbulence. The turbulence quantity measured was the variance of the streamwise wind velocity ...

Robert M. Banta; Yelena L. Pichugina; W. Alan Brewer

2006-11-01T23:59:59.000Z

432

Research Radar Analyses of the Internal Boundary Layer over Cape Canaveral, Florida, during the Landfall of Hurricane Frances (2004)  

Science Conference Proceedings (OSTI)

The structure of the coastal internal boundary layer (IBL) during a landfalling hurricane has important ramifications on operational forecasting, structural design, and poststorm damage assessment. Despite these important issues, the mean IBL ...

Brian D. Hirth; John L. Schroeder; Christopher C. Weiss; Douglas A. Smith; Michael I. Biggerstaff

2012-12-01T23:59:59.000Z

433

Importance of Accurate Liquid Water Path for Estimation of Solar Radiation in Warm Boundary Layer Clouds: An Observational Study  

Science Conference Proceedings (OSTI)

A 1-yr observational study of overcast boundary layer stratus at the U.S. Department of Energy Atmospheric Radiation Measurement Program Southern Great Plains site illustrates that surface radiation has a higher sensitivity to cloud liquid water ...

Manajit Sengupta; Eugene E. Clothiaux; Thomas P. Ackerman; Seiji Kato; Qilong Min

2003-09-01T23:59:59.000Z

434

Sensitivity of Climate Simulations to Land-Surface and Atmospheric Boundary-Layer Treatments-A Review  

Science Conference Proceedings (OSTI)

Aspects of the land-surface and boundary-layer treatments in some 20 or so atmospheric general circulation models (GCMS) are summarized. In only a small fraction of these have significant sensitivity studies been carried out and published. ...

J. R. Garratt

1993-03-01T23:59:59.000Z

435

Turbulence Structure of the Convective Boundary Layer. Part III: The Vertical Velocity Budgets of Thermals and Their Environment  

Science Conference Proceedings (OSTI)

The dynamics of thermal updrafts and compensating environmental downdrafts in the convective boundary layer are examined using observations from the Phoenix 78 field experiment. Separate vertical velocity budgets are presented for thermal ...

George S. Young

1988-07-01T23:59:59.000Z

436

Western Pacific Warm Pool Region Sensitivity to Convective Triggering byBoundary Layer Thermals in the NOGAPS Atmospheric GCM  

Science Conference Proceedings (OSTI)

The sensitivity of the atmospheric general circulation model of the Navy Operational Global Atmospheric Prediction System to a parameterization of convective triggering by atmospheric boundary layer thermals is investigated. The study focuses on ...

James A. Ridout; Carolyn A. Reynolds

1998-07-01T23:59:59.000Z

437

Modification of the Boundary Layer over the South China Sea during a Winter MONEX Cold Surge Event  

Science Conference Proceedings (OSTI)

Aircraft dropwindsonde and conventional sounding data have been used to document the boundary layer structure over the South China Sea during the period of a 3-day moderate cold surge that occurred during the December 1918 Winter Monsoon ...

Richard H. Johnson; Jeffery R. Zimmerman

1986-11-01T23:59:59.000Z

438

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

439

Measurement of Water Vapor Flux Profiles in the Convective Boundary Layer with Lidar and Radar-RASS  

Science Conference Proceedings (OSTI)

A remote-sensing method to retrieve vertical profiles of water vapor flux in the convective boundary layer by using a differential absorption lidar and a radar-radio acoustic sounding system is described. The system's height range presently ...

Christoph Senff; Jens Bösenberg; Gerhard Peters

1994-02-01T23:59:59.000Z

440

Development and Application of a Compact, Tunable, Solid-State Airborne Ozone Lidar System for Boundary Layer Profiling  

Science Conference Proceedings (OSTI)

The National Oceanic and Atmospheric Administration/Earth System Research Laboratory/Chemical Sciences Division (NOAA/ESRL/CSD) has developed a versatile, airborne lidar system for measuring ozone and aerosols in the boundary layer and lower free ...

R. J. Alvarez II; C. J. Senff; A. O. Langford; A. M. Weickmann; D. C. Law; J. L. Machol; D. A. Merritt; R. D. Marchbanks; S. P. Sandberg; W. A. Brewer; R. M. Hardesty; R. M. Banta

2011-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

Boundary-Layer Water Vapor Probing with a Solar-Blind Raman Lidar: Validations, Meteorological Observations and Prospects  

Science Conference Proceedings (OSTI)

The ability of a solar-blind Raman lidar (SBRL) to measure the vertical profile of water vapor in the boundary layer is proved from a theoretical as well as an experimental point of view.

D. Renaut; R. Capitini

1988-10-01T23:59:59.000Z

442

Time Series Measurements of Chlorophyll Fluorescence in the Oceanic Bottom Boundary Layer with a Multisensor Fiber-Optic Fluorometer  

Science Conference Proceedings (OSTI)

An in situ multisensor fiber-optic fluorometer (MFF) has been developed to acquire long-term chlorophyll fluorescence measurements in the oceanic bottom boundary layer to characterize the finescale pigment structure at vertical spatial scales ...

Eurico J. D’Sa; Steven E. Lohrenz; Vernon L. Asper; Roy A. Walters

1997-08-01T23:59:59.000Z

443

Horizontal-Velocity and Variance Measurements in the Stable Boundary Layer Using Doppler Lidar: Sensitivity to Averaging Procedures  

Science Conference Proceedings (OSTI)

Quantitative data on turbulence variables aloft—above the region of the atmosphere conveniently measured from towers—have been an important but difficult measurement need for advancing understanding and modeling of the stable boundary layer (SBL)...

Yelena L. Pichugina; Sara C. Tucker; Robert M. Banta; W. Alan Brewer; Neil D. Kelley; Bonnie J. Jonkman; Rob K. Newsom

2008-08-01T23:59:59.000Z

444

Relation between Mean Boundary-Layer Structure and Cloudiness at the R/V Valdivia during ASTEX  

Science Conference Proceedings (OSTI)

The relationship between boundary-layer thermodynamic structure and cloud fields and their diurnal variation are explored using seven days of data from dw R/V Valdivia during the Atlantic Stratocumulus Transition Experiment. Cloudiness is at a ...

Alan K. Betts; Christopher S. Bretherton; Ernst Klinker

1995-08-01T23:59:59.000Z

445

Numerical Study of Urban Impact on Boundary Layer Structure: Sensitivity to Wind Speed, Urban Morphology, and Rural Soil Moisture  

Science Conference Proceedings (OSTI)

A mesoscale model with a detailed urban surface exchange parameterization is used to study urban influences on boundary layer structure. The parameterization takes into account thermal and mechanical factors, and it is able to reproduce the most ...

Alberto Martilli

2002-12-01T23:59:59.000Z

446

Application of a dynamic-stochastic approach to short-term forecasting of the atmospheric boundary layer.  

Science Conference Proceedings (OSTI)

A two-dimensional, dynamic-stochastic model presented in this study is used for short-term forecasting of vertical profiles of air temperature and wind velocity orthogonal components in the atmospheric boundary layer (ABL). The technique of using ...

V. S. Komarov; A. V. Lavrinenko; N. Ya. Lomakina; S. N. Il’in

447

Eddy Diffusivity/Mass Flux and Shallow Cumulus Boundary Layer: An Updraft PDF Multiple Mass Flux Scheme  

Science Conference Proceedings (OSTI)

In this study, the eddy diffusivity/mass flux (EDMF) approach is used to combine parameterizations of nonprecipitating moist convection and boundary layer turbulence. The novel aspect of this EDMF version is the use of a probability density ...

Kay Sušelj; João Teixeira; Georgios Matheou

2012-05-01T23:59:59.000Z

448

The Probability Distribution of Sea Surface Wind Speeds: Effects of Variable Surface Stratification and Boundary Layer Thickness  

Science Conference Proceedings (OSTI)

Air–sea exchanges of momentum, energy, and material substances of fundamental importance to the variability of the climate system are mediated by the character of the turbulence in the atmospheric and oceanic boundary layers. Sea surface winds ...

Adam Hugh Monahan

2010-10-01T23:59:59.000Z

449

Parameterization of Land Surface Processes to Study Boundary Layer Characteristics over a Semiarid Region in Northwest India  

Science Conference Proceedings (OSTI)

The atmospheric boundary layer and land surface processes play a crucial role and affect large-scale phenomena such as monsoons. A comprehensive soil–vegetation parameterization scheme has been developed to understand the complex interaction of ...

A. N. V. Satyanarayana; V. N. Lykossov; U. C. Mohanty; E. E. Machul'skaya

2003-04-01T23:59:59.000Z

450

Experimental Study of an Artificial Thermal Plume in the Boundary Layer. Part II: Some Aspects of the Plume Thermodynamical Structure  

Science Conference Proceedings (OSTI)

Some aspects of the mean and turbulent structures of artificial thermal plumes in the boundary layer (BL) are presented. This analysis is based mainly on measurements with an instrumented aircraft. As initial conditions for plume rise, the ...

J. Noilhan; B. Bénech; G. Letrenne; A. Druilhet; A. Saab

1986-04-01T23:59:59.000Z

451

Grid Adaption and Its Effect on Entrainment in an E–l Model of the Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

A one-dimensional numerical model KOLUM is introduced that demonstrates the use of continuous dynamic grid adaption in modeling the atmospheric boundary layer. The entrainment rates of KOLUM are compared against recent calibrations for smoke ...

Brian H. Fiedler

2002-03-01T23:59:59.000Z

452

Modeling the Trade-Wind Cumulus Boundary Layer. Part I: Testing the Ensemble Cloud Relations Against Numerical Data  

Science Conference Proceedings (OSTI)

The possibility of studying the cloudy planetary boundary layer through one-dimensional modeling is investigated. The various possible parameterizations of mean liquid water content and correlations, in term of the known statistical properties of ...

Ph Bougeault

1981-11-01T23:59:59.000Z

453

Comparative Experiments with MAPS on Different Parameterization Schemes for Surface Moisture Flux and Boundary-Layer Processes  

Science Conference Proceedings (OSTI)

This study compares several formulations parameterizing the surface moisture flux and boundary-layer processes using the ?-? hybrid-b model of the Mesoscale Analysis and Prediction System (MAPS) within both 1D and 3D frameworks.

Zaitao Pan; Stanley G. Benjamin; John M. Brown; Tatiana Smirnova

1994-03-01T23:59:59.000Z

454

An Observational and Numerical Study of a Sheared, Convective Boundary Layer. Part I: Phoenix II Observations, Statistical Description, and Visualization  

Science Conference Proceedings (OSTI)

Four-dimensional velocity fields derived from dual Doppler radar observations are the basis of a description and statistical analysis of a convective, sheared planetary boundary layer during an afternoon over the High Plains of eastern Colorado. ...

Jeanne M. Schneider; Douglas K. Lilly

1999-09-01T23:59:59.000Z

455

Evaluating Weather Research and Forecasting (WRF) Model Predictions of Turbulent Flow Parameters in a Dry Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Weather Research and Forecasting (WRF) model predictions using different boundary layer schemes and horizontal grid spacings were compared with observational and numerical large-eddy simulation data for conditions corresponding to a dry ...

Jeremy A. Gibbs; Evgeni Fedorovich; Alexander M. J. van Eijk

2011-12-01T23:59:59.000Z

456

A Combined Local and Nonlocal Closure Model for the Atmospheric Boundary Layer. Part I: Model Description and Testing  

Science Conference Proceedings (OSTI)

The modeling of the atmospheric boundary layer during convective conditions has long been a major source of uncertainty in the numerical modeling of meteorological conditions and air quality. Much of the difficulty stems from the large range of ...

Jonathan E. Pleim

2007-09-01T23:59:59.000Z

457

A Climatological Study of Boundary Layer Wind Speed Using a Meso-?-Scale Higher-Order Closure Model  

Science Conference Proceedings (OSTI)

A mesoscale higher-order closure atmospheric boundary layer model has been used to get more detailed information than is possible from observations regarding horizontal and vertical variations of the wind in an area in southeastern Sweden. To ...

Hans Bergström

1996-08-01T23:59:59.000Z

458

Wind Tunnel Study of Turbulent Flow Structure in the Convective Boundary Layer Capped by a Temperature Inversion  

Science Conference Proceedings (OSTI)

Experiments on simulating the atmospheric convective boundary layer (CBL), capped by a temperature inversion and affected by surface shear, were carried out in the thermally stratified wind tunnel of the Institute of Hydrology and Water Resources,...

Evgeni Fedorovich; Rolf Kaiser; Matthias Rau; Erich Plate

1996-05-01T23:59:59.000Z

459

Spatial and Temporal Scales of Boundary Layer Wind Predictability in Response to Small-Amplitude Land Surface Uncertainty  

Science Conference Proceedings (OSTI)

Predictability experiments with the Weather Research and Forecast (WRF) model as a proxy for the atmosphere are analyzed to quantify the spatial and temporal scales of boundary layer wind response to land surface perturbations. Soil moisture is ...

Joshua P. Hacker

2010-01-01T23:59:59.000Z

460

Modeling the Atmospheric Convective Boundary Layer within a Zero-Order Jump Approach: An Extended Theoretical Framework  

Science Conference Proceedings (OSTI)

The paper presents an extended theoretical background for applied modeling of the atmospheric convective boundary layer within the so-called zero-order jump approach, which implies vertical homogeneity of meteorological fields in the bulk of ...

Evgeni Fedorovich

1995-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "marine boundary layer" 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

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

462

Climatology of the Low-Level Jet at the Southern Great Plains Atmospheric Boundary Layer Experiments Site  

Science Conference Proceedings (OSTI)

A unique dataset obtained with combinations of minisodars and 915-MHz wind profilers at the Atmospheric Boundary Layer Experiments (ABLE) facility in Kansas was used to examine the detailed characteristics of the nocturnal low-level jet (LLJ). In ...

Jie Song; Ke Liao; Richard L. Coulter; Barry M. Lesht

2005-10-01T23:59:59.000Z

463

Spatial and Structural Variation of the Atmospheric Boundary Layer during Summer in Israel—Profiler and Rawinsonde Measurements  

Science Conference Proceedings (OSTI)

An opportunity to improve understanding related to the structure of the atmospheric boundary layer (ABL) in Israel along the coastal region environs emerged in April 1997 when the Israel Electric Corporation, Ltd. (IEC), installed and began the ...

Uri Dayan; Batia Lifshitz-Goldreich; Karel Pick

2002-04-01T23:59:59.000Z

464

Prediction of continental shelf sediment transport using a theoretical model of the wave-current boundary layer  

E-Print Network (OSTI)

This thesis presents an application of the Grant-Madsen-Glenn bottom boundary layer model (Grant and Madsen, 1979; Glenn and Grant, 1987) to predictions of sediment transport on the continental shelf. The analysis is a ...

Goud, Margaret R

1987-01-01T23:59:59.000Z

465

Dispersion of Particles Released into a Neutral Planetary Boundary Layer Using a Markov Chain–Monte Carlo Model  

Science Conference Proceedings (OSTI)

The dispersion and concentration of particles (fluid elements) that are continuously released into a neutral planetary boundary layer is presented. The velocity fluctuations of the particles are generated using a Markov chain–Monte Carlo (MCMC) ...

R. Avila; S. S. Raza

2005-07-01T23:59:59.000Z

466

A Model Study of the Stably Stratified Steady-State Atmospheric Boundary Layer over a Slightly Inclined Terrain  

Science Conference Proceedings (OSTI)

A simple, steady-state, numerical model is used to examine the Rossby-number similarity theory of the atmospheric boundary layer over a slightly inclined terrain. The model confirms the similarity predictions. The slope-influenced universal ...

Zbigniew Sorbjan

1984-06-01T23:59:59.000Z

467

EPIC 95°W Observations of the Eastern Pacific Atmospheric Boundary Layer from the Cold Tongue to the ITCZ  

Science Conference Proceedings (OSTI)

The atmospheric boundary layer (ABL) along 95°W in the eastern equatorial Pacific during boreal autumn is described using data from the East Pacific Investigation of Climate (EPIC) 2001, with an emphasis on the evolution of the thermodynamic ABL ...

Simon P. de Szoeke; Christopher S. Bretherton; Nicholas A. Bond; Meghan F. Cronin; Bruce M. Morley

2005-02-01T23:59:59.000Z

468

An LES Study of the Impacts of Land Surface Heterogeneity on Dispersion in the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

A systematic analysis of the impacts of heat patches and topographical features on the dispersion of passive materials in a shear-free convective boundary layer (CBL) was performed. Large eddy simulations and a Lagrangian particle dispersion ...

S. G. Gopalakrishnan; Roni Avissar

2000-01-01T23:59:59.000Z

469

Numerical solution for mixed convection boundary layer flow of a nanofluid along an inclined plate embedded in a porous medium  

Science Conference Proceedings (OSTI)

The steady mixed convection boundary layer flow of an incompressible nanofluid along a plate inclined at an angle @a in a porous medium is studied. The resulting nonlinear governing equations with associated boundary conditions are solved using an optimized, ... Keywords: FDM, FEM, Inclined plate, Mixed convection, Nanofluid, Porous medium

Puneet Rana; R. Bhargava; O. A. BéG

2012-11-01T23:59:59.000Z

470

THE SIMULATION OF FINE SCALE NOCTURNAL BOUNDARY LAYER MOTIONS WITH A MESO-SCALE ATMOSPHERIC MODEL  

SciTech Connect

A field project over the Atmospheric Radiation Measurement-Clouds and Radiation Testbed (ARM-CART) site during a period of several nights in September, 2007 was conducted to explore the evolution of the low-level jet (LLJ). Data was collected from a tower and a sodar and analyzed for turbulent behavior. To study the full range of nocturnal boundary layer (NBL) behavior, the Regional Atmospheric Modeling System (RAMS) was used to simulate the ARM-CART NBL field experiment and validated against the data collected from the site. This model was run at high resolution, and is ideal for calculating the interactions among the various motions within the boundary layer and their influence on the surface. The model reproduces adequately the synoptic situation and the formation and dissolution cycles of the low-level jet, although it suffers from insufficient cloud production and excessive nocturnal cooling. The authors suggest that observed heat flux data may further improve the realism of the simulations both in the cloud formation and in the jet characteristics. In a higher resolution simulation, the NBL experiences motion on a range of timescales as revealed by a wavelet analysis, and these are affected by the presence of the LLJ. The model can therefore be used to provide information on activity throughout the depth of the NBL.

Werth, D.; Kurzeja, R.; Parker, M.

2009-04-02T23:59:59.000Z

471

Radial boundary layer structure and Nusselt number in Rayleigh-Benard convection  

E-Print Network (OSTI)

Results from direct numerical simulations for three dimensional Rayleigh-Benard convection in a cylindrical cell of aspect ratio 1/2 and Pr=0.7 are presented. They span five decades of Ra from $2\\times 10^6$ to $2 \\times10^{11}$. Good numerical resolution with grid spacing $\\sim$ Kolmogorov scale turns out to be crucial to accurately calculate the Nusselt number, which is in good agreement with the experimental data by Niemela et al., Nature, 404, 837 (2000). In underresolved simulations the hot (cold) plumes travel further from the bottom (top) plate than in the fully resolved case, because the thermal dissipation close to the sidewall (where the grid cells are largest) is insufficient. We compared the fully resolved thermal boundary layer profile with the Prandtl-Blasius profile. We find that the boundary layer profile is closer to the Prandtl Blasius profile at the cylinder axis than close to the sidewall, due to rising plumes in that region.

Stevens, Richard J A M; Lohse, Detlef

2009-01-01T23:59:59.000Z

472

Relationship between Low-Level Jet Properties and Turbulence Kinetic Energy in the Nocturnal Stable Boundary Layer  

Science Conference Proceedings (OSTI)

In the nighttime stable boundary layer (SBL), shear and turbulence are generated in the layer between the maximum of the low-level jet (LLJ) and the earth's surface. Here, it is investigated whether gross properties of the LLJ—its height and ...

Robert M. Banta; Yelena L. Pichugina; Rob K. Newsom

2003-10-01T23:59:59.000Z

473

Numerical Characteriztion of the Fracture Behavior of Solid Oxide Fuel Cell Materials by Means of Modified Boundary Layer Modeling  

Science Conference Proceedings (OSTI)

A modified boundary layer modeling approach is used to predict the fracture toughness and crack resistance behaviors of solid oxide fuel cell (SOFC) materials. In this approach, a pre-existing crack inside a layer or at an interface between two different layers is assumed under plane strain conditions. Fracture is allowed to occur in a small process window situated at the crack tip. The process window is contained in a circular region, which can involve two different materials and their interface. Elastic asymptotic crack-tip fields are prescribed as remote boundary conditions. Special attention focuses on the cracking of the interface between the glass seal and the electrolyte material.

Nguyen, Ba Nghiep; Koeppel, Brian J.; Singh, Prabhakar; Khaleel, Mohammad A.; Ahzi, Said

2004-01-01T23:59:59.000Z

474

A High-Power, Dual-Frequency Monostatic Acoustic Sounder for Studying the Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

Microwave propagation conditions in the lower marine troposphere are evaluated using gradients of radio refractivity profiles. An inexpensive, weather-resistant system for Continuous monitoring of radio refractivity conditions in the lower marine ...

Steven M. Babin; Robert E. Miller; John R. Rowland

1993-08-01T23:59:59.000Z

475

Using remotely sensed planetary boundary layer variables as estimates of areally averaged heat flux  

SciTech Connect

Homogeneity across the Southern Great Plains (SGP) Cloud and Radiation Testbed (CART) site is an issue of importance to all facets of the Atmospheric Radiation Measurements (ARM) program. The degree to which measurements at the central facility can be used to verify, improve, or develop relationships in radiative flux models that are subsequently used in Global Circulation Models (GCMs), for example, is tied directly to the representativeness of the local measurements at the central facility for the site as a whole. The relative variation of surface energy budget terms over a 350- km X 400km domain such as the SGP CART site can be extremely large. The Planetary Boundary Layer (PBL) develops as a result of energy inputs from widely varying surfaces. The lower atmosphere effectively integrates the local inputs; measurements of PBL structure can potentially be used for estimates of surface heat flux over scales on the order of tens of kilometers. This project is focusing on two PBL quantities that are intimately tied to the surface heat flux: (1) the height of the mixed layer, z, that grows during daytime due to sensible heat flux input from the surface; and (2) the convective velocity scale, normally a scaling parameter defined by the product of the sensible heat flux and z, but in this case defined by coherent structures that connect the surface layer and the capping inversion that defines z.

Coulter, R.L.; Martin, T.J.; Holdridge, D.J.

1995-06-01T23:59:59.000Z

476

Influence of nosetip shape on boundary layer transition in arc heated jets  

SciTech Connect

The effect of model shape on the graphite recession rate and boundary layer transition was studied in an arc jet over the pressure and enthalpy ranges of 0.99 to 20.7 MPa (9.8 to 204 atm) and 3416 to 15640J/g (1470 to 6730 Btu;lb), respectively. Hemispheric, flat-faced and conic cylindrical models were used. It was found that resistance to transition occurs in the order of flat-faced > conic > hemispheric shape. Evidence of this behavior is provided in terms of the relative ablation rates associated with each shape and the times-to-transition. The differences in resistance to transition are appreciable and suggest that reentry vehicles would benefit with respect to nosetip shape change by changing from the conventional hemispheric shape to a conic or, preferably, a flat-faced configuration.

Auerbach, I.

1978-01-01T23:59:59.000Z

477

Coupled Mesoscale-Large-Eddy Modeling of Realistic Stable Boundary Layer Turbulence  

E-Print Network (OSTI)

Site-specific flow and turbulence information are needed for various practical applications, ranging from aerodynamic/aeroelastic modeling for wind turbine design to optical diffraction calculations. Even though highly desirable, collecting on-site meteorological measurements can be an expensive, time-consuming, and sometimes a challenging task. In this work, we propose a coupled mesoscale-large-eddy modeling framework to synthetically generate site-specific flow and turbulence data. The workhorses behind our framework are a state-of-the-art, open-source atmospheric model called the Weather Research and Forecasting (WRF) model and a tuning-free large-eddy simulation (LES) model. Using this coupled framework, we simulate a nighttime stable boundary layer (SBL) case from the well-known CASES-99 field campaign. One of the unique aspects of this work is the usage of a diverse range of observations for characterization and validation. The coupled models reproduce certain characteristics of observed low-level jets....

Wang, Yao; Manuel, Lance

2013-01-01T23:59:59.000Z

478

Analysis of the planetary boundary layer with a database of large-eddy simulation experiments  

E-Print Network (OSTI)

Observational studies of a planetary boundary layer (PBL) are difficult. Ground-born measurements usually characterize only a small portion of the PBL immediately above the surface. Air-born measurements cannot be obtained close to the surface and therefore cannot capture any significant portion of the PBL interior. Moreover, observations are limited in choice of instrumentation, time, duration, location of measurements and occasional weather conditions. Although turbulence-resolving simulations with a large-eddy simulation (LES) code do not supplant observational studies, they provide valuable complementary information on different aspect of the PBL dynamics, which otherwise difficult to acquire. These circumstances motivated development of a medium-resolution database (DATABASE64) of turbulence-resolving simulations, which is available on ftp://ftp.nersc.no/igor/. DATABASE64 covers a range of physical parameters typical for the barotropic SBL over a homogeneous rough surface. LES runs in DATABASE64 simulate...

Esau, Igor

2010-01-01T23:59:59.000Z

479

Catalyzed combustion in a flat plate boundary layer. II. Numerical calculations  

DOE Green Energy (OSTI)

A computer program has been developed to solve the boundary layer equations for laminar flow over a heated plate with H/sub 2//air combustion. The objectives are to investigate the importance of homogeneous as opposed to catalytic surface reactions during the combustion process, and to determine the roles of heat and mass transfer and their effect on combustion. Results are presented for combustion of H/sub 2//air at an equivalence ratio of 0.1 for flow over a noncatalytic plate at a surface temperature of 1100/sup 0/K. A detailed mechanism involving 8 chemical species and 13 reactions has been used to describe the kinetics. The reactions leading to the initiation of combustion and the effect of the large diffusivity of hydrogen are discussed. The boundary conditions for catalytic surface and a simplified model to account for catalytic wall reaction are formulated. Results are presented for combustion over a catalytic surface and compared with the non-catalytic case.

Schefer, R.; Robben, F.

1977-09-01T23:59:59.000Z

480

RACORO Extended-Term Aircraft Observations of Boundary-Layer Clouds  

SciTech Connect

A first-of-a-kind, extended-term cloud aircraft campaign was conducted to obtain an in-situ statistical characterization of boundary-layer clouds needed to investigate cloud processes and refine retrieval algorithms. Coordinated by the Atmospheric Radiation Measurement (ARM) Aerial Facility (AAF), the Routine AAF Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations (RACORO) field campaign operated over the ARM Southern Great Plains (SGP) site from 22 January to 30 June 2009, collecting 260 h of data during 59 research flights. A comprehensive payload aboard the Center for Interdisciplinary Remotely-Piloted Aircraft Studies (CIRPAS) Twin Otter aircraft measured cloud microphysics, solar and thermal radiation, aerosol properties, and atmospheric state parameters. Proximity to the SGP's extensive complement of surface measurements provides ancillary data that supports modeling studies and enables evaluating a variety of surface retrieval algorithms. The five-month duration enabled sampling a range of conditions associated with the seasonal transition from winter to summer. Although about two-thirds of the cloud flights occurred in May and June, boundary-layer cloud fields were sampled under a variety of environmental and aerosol conditions, with about 75% of the flights occurring in cumulus and stratocumulus. Preliminary analyses show how these data are being used to analyze cloud-aerosol relationships, determine the aerosol sizes that are responsible for nucleating cloud drops, characterize the horizontal variability of the cloud radiative impacts, and evaluate air-borne and surface-based cloud property retrievals. We discuss how conducting an extended-term campaign requires a simplified operating paradigm that is different from that used for typical, short-term, intensive aircraft field programs.

Vogelmann, A. M.; McFarquhar, Greg; Ogren, John A.; Turner, David D.; Comstock, Jennifer M.; Feingold, G.; Long, Charles N.; Jonsson, Haf; Bucholtz, Anthony; Collins, Donald R.; Diskin, G. S.; Gerber, H.; Lawson, Paul; Woods, Roy; Andrews, Elizabeth; Yang, Hee-Jung; Chiu, Christine J.; Hartsock, Daniel; Hubbe, John M.; Lo, Chaomei; Marshak, A.; Monroe, Justin; McFarlane, Sally A.; Schmid, Beat; Tomlinson, Jason M.; Toto, Tami

2012-06-30T23:59:59.000Z

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481

Boundary-Layer Receptivity to Three-Dimensional Roughness Arrays on a Swept-Wing  

E-Print Network (OSTI)

On-going efforts to reduce aircraft drag through transition delay focus on understanding the process of boundary-layer transition from a physics-based perspective. For swept-wings subject to transition dominated by a stationary crossflow instability, one of the remaining challenges is understanding how freestream disturbances and surface features such as surface roughness create the initial amplitudes for unstable waves. These waves grow, modify the mean flow and create conditions for secondary instabilities to occur, which in turn ultimately lead to transition. Computational methods that model the primary and secondary instability growth can accurately model disturbance evolution as long as appropriate initial conditions are supplied. Additionally, transition delay using discrete roughness arrays that exploit known sensitivities to surface roughness has been demonstrated in flight and wind tunnel testing; however, inconsistencies in performance from the two test platforms indicate further testing is required. This study uses detailed hotwire boundary-layer velocity scans to quantify the relationship between roughness height and initial disturbance amplitude. Naphthalene flow visualization provides insight into how transition changes as a result of roughness height and spacing. Micron-sized, circular roughness elements were applied near the leading edge of the ASU(67)-0315 model installed at an angle of attack of -2.9 degrees in the Klebanoff-Saric Wind Tunnel. Extensive flow quality measurements show turbulence intensities less than 0.02% over the speed range of interest. A survey of multiple roughness heights for the most unstable and control wavelengths and Reynolds numbers of 2.4 x 10? 2.8 x 10? and 3.2 x 10? was completed for chord locations of 10%, 15% and 20%. When care was taken to measure in the region of linear stability, it was found that the disturbance amplitude varies almost linearly with roughness height. Naphthalene flow visualization indicates that moderate changes in already-low freestream turbulence levels can have a significant impact on transition behavior.

Hunt, Lauren Elizabeth

2011-12-01T23:59:59.000Z

482

Marine Atmospheric Boundary Layer Divergence and Clouds along California in June 1996  

Science Conference Proceedings (OSTI)

The authors have performed a numerical experiment using Mesoscale Model 5 (MM5) with a horizontal resolution of 9 km to simulate hourly atmospheric dynamics and thermodynamics along the U.S. California coast for all of June 1996. The MM5 results ...

Darko Kora?in; Clive E. Dorman

2001-08-01T23:59:59.000Z

483

Understanding the role of organic aerosol in the coastal and remote pacic marine boundary layer  

E-Print Network (OSTI)

wood burning, it is expected that it would be correlated to tracers commonly associated with fossil fuel combustion.combustion aerosol to OM during summer 2008 in California. Similarities to previously reported wood

Hawkins, Lelia Nahid

2010-01-01T23:59:59.000Z

484

Understanding the role of organic aerosol in the coastal and remote pacic marine boundary layer  

E-Print Network (OSTI)

forest fire from fossil fuel combus- tion organicSouth Asia: Biomass or Fossil Fuel Combustion? Science 323 (of NOx and SOx from fossil-fuel combustion between 1966 and

Hawkins, Lelia Nahid

2010-01-01T23:59:59.000Z

485

Test of the Volume-of-Fluid Method on Simulations of Marine Boundary Layer Clouds  

Science Conference Proceedings (OSTI)

The impact of using grid-averaged thermodynamic properties (i.e., neglecting their subgrid variability due to partial cloudiness) to represent forcings for condensation or evaporation has long been recognized. In particular, numerical ...

C-Y. J. Kao; Y. H. Hang; J. M. Reisner; W. S. Smith

2000-06-01T23:59:59.000Z

486

Wave-Driven Wind Jets in the Marine Atmospheric Boundary Layer  

Science Conference Proceedings (OSTI)

The interaction between ocean surface waves and the overlying wind leads to a transfer of momentum across the air–sea interface. Atmospheric and oceanic models typically allow for momentum transfer to be directed only downward, from the ...

Kirsty E. Hanley; Stephen E. Belcher

2008-08-01T23:59:59.000Z

487

Nocturnal Low-Level-Jet-Dominated Atmospheric Boundary Layer Observed by a Doppler Lidar Over Oklahoma City during JU2003  

SciTech Connect

Boundary layer wind data observed by a Doppler lidar and sonic anemometers during the mornings of three intensive observational periods (IOP2, IOP3, and IOP7) of the Joint Urban 2003 (JU2003) field experiment are analyzed to extract the mean and turbulent characteristics of airflow over Oklahoma City, Oklahoma. A strong nocturnal low-level jet (LLJ) dominated the flow in the boundary layer over the measurement domain from midnight to the morning hours. Lidar scans through the LLJ taken after sunrise indicate that the LLJ elevation shows a gradual increase of 25-100 m over the urban area relative to that over the upstream suburban area. The mean wind speed beneath the jet over the urban area is about 10%-15% slower than that over the suburban area. Sonic anemometer observations combined with Doppler lidar observations in the urban and suburban areas are also analyzed to investigate the boundary layer turbulence production in the LLJ-dominated atmospheric boundary layer. The turbulence kinetic energy was higher over the urban domain mainly because of the shear production of building surfaces and building wakes. Direct transport of turbulent momentum flux from the LLJ to the urban street level was very small because of the relatively high elevation of the jet. However, since the LLJ dominated the mean wind in the boundary layer, the turbulence kinetic energy in the urban domain is correlated directly with the LLJ maximum speed and inversely with its height. The results indicate that the jet Richardson number is a reasonably good indicator for turbulent kinetic energy over the urban domain in the LLJ-dominated atmospheric boundary layer.

Wang, Yansen; Klipp, Cheryl L.; Garvey, Dennis M.; Ligon, David; Williamson, Chatt C.; Chang, Sam S.; Newsom, Rob K.; Calhoun, Ron

2007-12-01T23:59:59.000Z

488

Comparing modeled isoprene with aircraft-based measurements in the atmospheric boundary layer.  

Science Conference Proceedings (OSTI)

Nonmethane hydrocarbons (NMHCs) are involved in a complex series of reactions that regulate the levels of oxidants in the troposphere. Isoprene (C{sub 5}H{sub 8}), the primary NMHC emitted from deciduous trees, is one of the most important reactive hydrocarbons in the troposphere. The amount of isoprene entering the free troposphere is regulated by the compound's rate of emission from leaves and by chemical and physical processes in the forest canopy and the atmospheric boundary layer (ABL). This study uses a coupled canopy-ABL model to simulate these complex processes and compares calculated isoprene concentration profiles with those measured during aircraft flights above a forested region in the northeastern US. Land use information is coupled with satellite remote sensing data to describe spatial changes in canopy density during the field measurements. The high-resolution transport-chemistry model of Gao et al. (1993) for the ABL and the forest canopy layer is used to simulate vertical changes in isoprene concentration due to turbulent mixing and chemical reactions. The one-dimensional (1-D) ABL model includes detailed radiation transfer, turbulent diffusion, biogenic emissions, dry deposition, and chemical processes within the forest canopy and the ABL. The measured profiles are compared with the model simulations to investigate the biological, physical, and chemical processes that regulate the levels of isoprene within the ABL.

Doskey, P.; Gao, W.

1997-12-12T23:59:59.000Z

489

A Unified Model for Moist Convective Boundary Layers Based on a Stochastic Eddy-Diffusivity/Mass-Flux Parameterization  

Science Conference Proceedings (OSTI)

A single-column model (SCM) is developed for representing moist convective boundary layers. The key component of the SCM is the parameterization of subgrid-scale vertical mixing, which is based on a stochastic eddy-diffusivity/mass-flux (EDMF) ...

Kay Sušelj; João Teixeira; Daniel Chung

2013-07-01T23:59:59.000Z

490

The Boundary Layer Response to Recent Arctic Sea Ice Loss and Implications for High-Latitude Climate Feedbacks  

Science Conference Proceedings (OSTI)

This study documents and evaluates the boundary layer and energy budget response to record low 2007 sea ice extents in the Community Atmosphere Model version 4 (CAM4) using 1-day observationally constrained forecasts and 10-yr runs with a freely ...

J. E. Kay; K. Raeder; A. Gettelman; J. Anderson

2011-01-01T23:59:59.000Z

491

Nocturnal Low-Level-Jet-Dominated Atmospheric Boundary Layer Observed by a Doppler Lidar over Oklahoma City during JU2003  

Science Conference Proceedings (OSTI)

Boundary layer wind data observed by a Doppler lidar and sonic anemometers during the mornings of three intensive observational periods (IOP2, IOP3, and IOP7) of the Joint Urban 2003 (JU2003) field experiment are analyzed to extract the mean and ...

Yansen Wang; Cheryl L. Klipp; Dennis M. Garvey; David A. Ligon; Chatt C. Williamson; Sam S. Chang; Rob K. Newsom; Ronald Calhoun

2007-12-01T23:59:59.000Z

492

Wind profile above the surface boundary layer S.-E. Gryning (1), E. Batchvarova (2) and B. Brmmer (3)  

E-Print Network (OSTI)

Wind profile above the surface boundary layer S.-E. Gryning (1), E. Batchvarova (2) and B. Brümmer in predictions of the wind profile in the lowest hundreds me- ters of the atmosphere, being connected to the general increase in height of structures such as bridges, high houses and wind turbines. The hub height

493

A Numerical Study of the Interaction between a Deep Cold Jet and the Bottom Boundary Layer of the Ocean  

Science Conference Proceedings (OSTI)

A two-dimensional (x-z) primitive equation model is used to study the interaction between a deep cold jet on a sloping bottom and the bottom boundary layer (BBL) of the deep ocean. Two closure schemes are used: a standard second order turbulence ...

Tal Ezer; Georges L. Weatherly

1990-06-01T23:59:59.000Z

494

Analysis of a Radome Air-Motion System on a Twin-Jet Aircraft for Boundary-Layer Research  

Science Conference Proceedings (OSTI)

A “radome gust probe” system was installed on a twin-jet aircraft for the purpose of boundary-layer research. This system provided a useful relatively low-cost method for air motion and turbulence measurements on an aircraft already equipped with ...

Michael Tjernström; Carl A. Friehe

1991-02-01T23:59:59.000Z

495

Measurement of Vertical Kinetic Energy and Vertical Velocity Skewness in Oceanic Boundary Layers by Imperfectly Lagrangian Floats  

Science Conference Proceedings (OSTI)

The effects of upward buoyancy on the accuracy with which Lagrangian floats can measure the Eulerian mean variance wwE and skewness SwE of vertical fluid velocity w in the wind-driven upper-ocean boundary layer is investigated using both ...

Ramsey R. Harcourt; Eric A. D’Asaro

2010-11-01T23:59:59.000Z

496

Meteorological Tower, Microbarograph Array, and Sodar Observations of Solitary-like Waves in the Nocturnal Boundary Layer  

Science Conference Proceedings (OSTI)

Five short-duration disturbances of the stable nocturnal boundary layer, ranging in depth from about 15 m to over 500 m, were observed using a 300 m meteorological tower, 2 sodars, and a 4-station microbarograph array. Four of the events showed ...

T. K. Cheung; C. G. Little

1990-11-01T23:59:59.000Z

497

The Behavior of Passive and Buoyant Plumes in a Convective Boundary Layer, as Simulated with a Large-Eddy Model  

Science Conference Proceedings (OSTI)

With a large-eddy model the large-scale flow structure of the convective boundary layer is simulated in a box of (5 × 5 × 2) km. The calculation is run till the turbulence has reached a quasi-steady state. At that time we introduce a line-source ...

L. van Haren; F. T. M. Nieuwstadt

1989-09-01T23:59:59.000Z

498

Statistics of Absolute and Relative Dispersion in the Atmospheric Convective Boundary Layer: A Large-Eddy Simulation Study  

Science Conference Proceedings (OSTI)

The influence of the different scales of turbulent motion on plume dispersion in the atmospheric convective boundary layer (CBL) is studied by means of a large-eddy simulation (LES). In particular, the large-scale (meandering) and small-scale (...

Alessandro Dosio; Jordi Vilà-Guerau de Arellano

2006-04-01T23:59:59.000Z

499

A Mixed Spectral Finite-Difference 3D Model of Neutral Planetary Boundary-Layer Flow over Topography  

Science Conference Proceedings (OSTI)

A simple three-dimensional linear model of planetary boundary-layer flow is developed based on the Mixed Spectral Finite-Difference model of Beljaars et al. using the full second-order turbulence closure of Launder et al. The model uses a steady-...

Keith W. Ayotte; Peter A. Taylor

1995-10-01T23:59:59.000Z

500

Estimation of Dissipative Heating Using Low-Level In Situ Aircraft Observations in the Hurricane Boundary Layer  

Science Conference Proceedings (OSTI)

Data collected in the low-level atmospheric boundary layer in five hurricanes by NOAA research aircraft are analyzed to measure turbulence with scales small enough to retrieve the rate of dissipation. A total of 49 flux runs suitable for analysis ...

Jun A. Zhang

2010-06-01T23:59:59.000Z