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Title: Convective cloud vertical velocity and mass-flux characteristics from radar wind profiler observations during GoAmazon2014/5: VERTICAL VELOCITY GOAMAZON2014/5

A radar wind profiler data set collected during the 2 year Department of Energy Atmospheric Radiation Measurement Observations and Modeling of the Green Ocean Amazon (GoAmazon2014/5) campaign is used to estimate convective cloud vertical velocity, area fraction, and mass flux profiles. Vertical velocity observations are presented using cumulative frequency histograms and weighted mean profiles to provide insights in a manner suitable for global climate model scale comparisons (spatial domains from 20 km to 60 km). Convective profile sensitivity to changes in environmental conditions and seasonal regime controls is also considered. Aggregate and ensemble average vertical velocity, convective area fraction, and mass flux profiles, as well as magnitudes and relative profile behaviors, are found consistent with previous studies. Updrafts and downdrafts increase in magnitude with height to midlevels (6 to 10 km), with updraft area also increasing with height. Updraft mass flux profiles similarly increase with height, showing a peak in magnitude near 8 km. Downdrafts are observed to be most frequent below the freezing level, with downdraft area monotonically decreasing with height. Updraft and downdraft profile behaviors are further stratified according to environmental controls. These results indicate stronger vertical velocity profile behaviors under higher convective available potential energy and lowermore » low-level moisture conditions. Sharp contrasts in convective area fraction and mass flux profiles are most pronounced when retrievals are segregated according to Amazonian wet and dry season conditions. During this deployment, wet season regimes favored higher domain mass flux profiles, attributed to more frequent convection that offsets weaker average convective cell vertical velocities.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton New York USA
  2. Pacific Northwest National Laboratory, Richland Washington USA
  3. Centre for Australian Weather and Climate Research, Melbourne Victoria Australia
  4. University of Colorado Boulder and NOAA/Earth System Research Laboratory/Physical Sciences Division, Boulder Colorado USA
  5. Texas A&M University, College Station Texas USA
  6. National Institute for Space Research, Sao Jose dos Campos Brazil
Publication Date:
Report Number(s):
PNNL-SA-122876; BNL-113519-2017-JA
Journal ID: ISSN 2169-897X; KP1701000
Grant/Contract Number:
AC05-76RL01830; SC0012704
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 121; Journal Issue: 21; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; mass flux; Amazon; radar wind profiler; vertical velocity; convection; GCM
OSTI Identifier:
1344234
Alternate Identifier(s):
OSTI ID: 1339830