Other
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975japme..14..289n&link_type=abstract
Journal of Applied Meteorology, vol. 14, Issue 3, pp.289-296
Other
12
Scientific paper
Two methods of pararmeterizing expressions for ground surface evaporation rate that are used in planetary boundary layer models have been examined. In one method (Method A) the surface evaporation rate is proportional to M (Qs Q1). In the other (Method B) the surface evaporation rate is proportional to hQs Q1. Here Qs is the surface saturation mixing ratio, Q1 the mixing ratio at the lowest level of the atmospheric model, M the moisture availability parameter, and h the relative humidity immediately above the ground. The analysis was performed by running a planetary boundary layer numerical model several times, using at each time either Method A or B with different specifications of M and h. The calculated diurnal surface temperature and surface latent heat flux were examined. Specific results are: 1) for equal M andh, Method B results in higher surface temperatures than Method A; 2) the surface evaporation rate calculated using Method A is less sensitive to changes in M, than the surface evaporation rate calculated using Method B is to changes in h; 3) negative surface evaporation rates can occur much more easily using Method B than Method A, and 4) calculation of h by calculating the flux of moisture below the ground surface does not improve the model used in this study.
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