Flux determination over a smooth surface under strongly unstable conditions |
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| Authors: | Michiaki Sugita Tetsuya Hiyama Nobuhiko Endo Shao-Fen Tian |
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| Institution: | (1) Environmental Research Center, University of Tsukuba, 305 Tsukuba, Ibaraki, Japan;(2) Doctoral Program in Geoscience, University of Tsukuba, 305 Tsukuba, Ibaraki, Japan |
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| Abstract: | Careful micrometeorological measurements on an empty parking lot allowed determination of the surface fluxes of sensible heatH and of momentum by applying profile equations derived from Monin-Obukhov similarity theory with two sets of the stability correction function for momentum 
m
and sensible heat
h
. These fluxes were compared with reference values ofH independently determined by means of an eddy correlation technique. In general, better agreement was found betweenH values derived from profiles with the stability functions of Brutsaert (1992) and referenceH values, than when the Businger-Dyer functions were used to deriveH. The disagreement in the latter comparison was especially serious under strongly unstable conditions, with the value ofy=–z/L (wherez is the height andL is the Obukhov length) larger than 10. A closer look at the procedure for calculatingH from the profiles revealed that the large differences between theH values derived with these two different versions of the stability correction functions were caused by the small differences of the
h
values, and not by the larger differences of the
m
values. This result stems from the strong sensitivity of the resultingH values on the choice of
h
. |
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| Keywords: | |
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