Observations of Spatial Variations of Boundary Layer Structure over the Southern Great Plains Cloud and Radiation Testbed.

Details Observations of Spatial Variations of Boundary Layer Structure over the Southern Great Plains Cloud and Radiation Testbed. Observations of Spatial Variations of Boundary Layer Structure over the Southern Great Plains Cloud and Radiation Testbed.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997japme..36.1221h&link_type=abstract

Journal of Applied Meteorology, vol. 36, Issue 9, pp.1221-1231

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10

Scientific paper

Results from a field campaign to study the response of the planetary boundary layer to spatially varying surface conditions are presented. Radiosondes released at four locations with contrasting land use characteristics in the U.S. Department of Energy's Cloud and Radiation Testbed (CART) in Kansas and Oklahoma showed significant variations in mixed-layer depth, temperature, and water vapor mixing ratios over distances of 100-200 km. Using CART and radiosonde data, estimates of the surface sensible and latent heat fluxes are derived; the results from several methods are compared and a discussion of the similarities and differences in the values is given. Although substantial flux differences among the sites account for some of the variations in the boundary layer behavior, other features of the ambient meteorology and initial conditions appear to be equally important. Despite large changes in mixed-layer and surface-layer temperatures over scales of approximately 100 km, no evidence for temperature-induced secondary circulations was found. A simple scaling argument is presented that gives a possible reason for this absence.

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