A field campaign was carried out near Boardman, Oregon, to study the effects of subgrid-scale variability of sensible- and latent-heat fluxes on surface boundary-layer properties. The experiment involved three U.S. Department of Energy laboratories, one National Oceanic and Atmospheric Administration laboratory, and several universities. The experiment was conducted in a region of severe contrasts in adjacent surface types that accentuated the response of the atmosphere to variable surface forcing. Large values of sensible-heat flux and low values of latent-heat flux characterized a sagebrush steppe area; significantly smaller sensible-heat fluxes and much larger latent-heat fluxes were associated with extensive tracts of irrigated farmland to the north, east, and west of the steppe. Data were obtained from an array of surface flux stations, remote-sensing devices, an instrumented aircraft, and soil and vegetation measurements. The data will be used to address the problem of extrapolating from a limited number of local measurements to area-averaged values of fluxes suitable for use in global climate models.

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1Pacific Northwest Laboratory, Richland, Washington

2Los Alamos National Laboratory, Los Alamos, New Mexico

3Argonne National Laboratory, Argonne, Illinois

4Atmospheric Turbulence and Diffusion Division, Oak Ridge, Tennessee

5EG&G Measurements, Inc., Las Vegas, Nevada

6Blackland Research Center, Texas Agricultural Experiment Station, Temple, Texas

7University of Washington, Seattle, Washington

8Utah State University, Logan, Utah

9Illinois State Water Survey, Champaign, Illinois