Evaluation of estimation method of regional evaporation using complementary relationship and convective boundary layer model

Abstract

Reginal evaporation (E_a) estimated by a combination of complementary relationship and CBL model is compared with local evaporation (E) by means of eddy correlation method in order to explore the feature of the new estimation method. The comparison is carried out half-hourly during the daytime on clear days for May-June 2006 at the tower flux site in Loess Plateau, China. The observations contain profiles of temperature and vapor density with microwave radiometer and CBL height obtained by wind profiler.
E_a is about four or five times as large as E. This large difference seems to be partly caused by radiation imbalance between surface fluxes(H+lE) and available energy (R_n-G) while the ratio of the former to the latter is about 1/2.