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Title: Boundary layer structure over areas of heterogeneous heat fluxes

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 areasmore » 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.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Pacific Northwest Lab., Richland, WA (United States)
  2. Los Alamos National Lab., NM (United States)
  3. Argonne National Lab., IL (United States)
  4. National Oceanic and Atmospheric Administration, Oak Ridge, TN (United States). Air Resources Lab. Atmospheric Turbulence and Diffusion Div.
Publication Date:
OSTI Identifier:
10136458
Report Number(s):
PNL-SA--21377; CONF-930142--5
ON: DE93007887
DOE Contract Number:
AC06-76RL01830; W-31109-ENG-38; W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 4. American Meteorological Society (AMS) symposium on global change studies,Anaheim, CA (United States),14-19 Jan 1993; Other Information: PBD: Jan 1993
Research Org:
Pacific Northwest Lab., Richland, WA (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; SURFACE AIR; ATMOSPHERIC CIRCULATION; WIND; METEOROLOGY; HEAT FLUX; VARIATIONS; BOUNDARY LAYERS; TOPOLOGY; EARTH ATMOSPHERE; TURBULENCE; MATHEMATICAL MODELS; TEMPERATURE DEPENDENCE 540120; 540130; CHEMICALS MONITORING AND TRANSPORT; RADIOACTIVE MATERIALS MONITORING AND TRANSPORT