干旱区生态环境知识资源中心

The annual evaporation from the KEIFE Linze Desert Station in the Hexi Corridor, Gansu, China was estimated by the energy balance method, using observed net radiation, sensible heat flux estimated by the bulk method, with transfer coefficients obtained during short IOP’s in the four seasons and heat flux into the ground estimated from the soil temperature profile for every 10 days, to be about 120 mm/year in 1991 and 1992. This method was used because turbulent characteristics of water vapor showed unexpected characteristics from existing knowledge over the dry and hot desert surface air layer. The value of annual evaporation is larger than annual precipitation of 100 mm/year in the bottom part of Hexi Corridor or HEIFE area by about 20 %.