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United States Department of Agriculture

Agricultural Research Service

Title: Comparison of Surface Heat Fluxes Estimates over the Sgp97 El Reno Site

Authors
item French, Andrew
item Schmugge, Thomas
item Kustas, William
item Prueger, John
item Macpherson, J - NRC, OTTAWA, CANADA

Submitted to: American Geophysical Union
Publication Type: Abstract Only
Publication Acceptance Date: May 30, 2000
Publication Date: N/A

Technical Abstract: Spatially distributed surface heat flux estimates spanning June 29 to July 2, 1997, are derived from the combination of aircraft-based remote sensing data, ground level meteorological data, and a two-source energy flux model. To better gauge the reliability of these heat flux estimates, they are compared with two independently obtained heat flux estimates: ground-based and aircraft-based eddy-correlation measurements. Comparison with tower-based eddy correlation measurements showed good agreement for morning hours, but not for afternoon hours. Aircraft-based eddy correlation flux measurements showed good relative agreement, especially when comparing fully vegetated fields to bare soil fields. The results show that comparisons between remote sensing derived estimates and direct measurements from eddy correlation instruments can be made if sampling footprints and surface conditions beneath these footprints are considered. In this study, upwind contributory surfaces were computed from a one-dimensional diffusion model, and surface properties were estimated from vegetation indices and thermal-band emissivities.

Last Modified: 4/24/2014
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