Zhang Yinsheng, Yao Tandong, Pu Jianchen, T Ohata, H Yabuki, K Fujita
Dongkemadi Glacier is located in the middle of Tanggula Mts., Tibetan Plateau, 33°02’ N, 90°02’ E, where the equilibrium line altitude is near 5600 m a.s.l.. The solar radiation budget and energy balance were anlysed based on a long time series observation in an automatic station setted on the ELA of the glacier. At the observing point, the annaul mean air temperature is -9.8℃, the annual mean air vapour pressure is 2.6 hpa, and the annual wind speed is 4.3 m/s. The annual amount of global radiation that reach on the surface of the glacier is about 7300 MJ/m2, but only 1/4 of that is absorbed by the glacier. The net radiation is positive from April to October but negative for the rest. The latent heat flux has an opsite direction seasonal variation with net radiation. The sensible heat flux is poxitive for all seasons so that it is an important energy source for the glacier surface. The melting heat occurs from May to September but has less contribution to heat balance comparing with latent heat. The conductive heat flux is few in energy budget on the glacier surface. Both the energy exchanging level and the energy exchanging coefficient are large in summer and winter. There is a good relationship between the air temperature above the glacier and net radiation. The sensitivity coefficient of air temperature above the glacier to variation of global radiation is related well with albedo and absorbed radiation.
