A BULK SIMILARITY APPROACH IN THE ATMOSPHERIC BOUNDARY LAYER TO DETERMINE REGIONAL SENSIBLE HEAT FLUXES
Hidekazu Kato (1), Michiaki Sugita (1), Motomu Toda (3)
(1) Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
(3) Institute of Low Temperature Science, Hokkaido University, Sapporo City, Hokkaido, Japan
Profiles of potential temperature measured by radiosoundings in the atmospheric boundary layer (ABL) were used with surface temperature measurements to determine regional sensible heat flux by means of transfer parameterizations on the basis of bulk similarity. In the present study, the similarity functions C calibrated with the FIFE (First ISLSCP (International Satellite Land Surface Climatology Project) Field Experiment) data set were first used, and the resulting H values were compared with the reference values Hs for additional three data sets of NOPEX (Northern Hemisphere Climate Processes Land Surface Experiment, TABLE (Tsukuba Atmospheric Boundary Layer Experiment) and GAME-T. Then C-functions were recalibrated with the four combined data sets and the same method with the new C-functions produced similarly good results. With the C-functions and the parameterized scalar roughness length for sensible heat, H compared reasonably well with Hs with the rms error of the order of 30 Wm-2.
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Hidekazu Kato
30-Jul-04-15:50:50
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Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan