Studies on the Processes of Thermal Exchange, Evaporation and Sublimation of the Snow Cover in the Tianshan Mountains, China
Wei Wenshou, Wang Cunniu, Jiang Fengqing and Wang Jiqiang(Xijiang Institute of Geography, Chinese Academy of Sciences, Urumqi, 830011)
The experiments and observations were carried out on the surface of Glacier No. 1 near the Tianshan Glaciological Station and at the snowpack of Tianshan Station for Snow and Avalanche Research. The change pattern of thermal flux of solar radiation, process of heat transmission and climatic effect of evaporation and sublimation in the areas covered by snow (including the glacial areas covered by granular snow) are discussed based on the thermal exchange, spatial and temporal distribution characteristics of evaporation and sublimation, and the process of thermal flow transmission in the ice-snow layers in different regions. The results show that the thermal flux of radiation complies mainly with the solar direct radiation; the transmissive depths of the heat of solar radiation are only 0~ 22 cm in snow layers, the heat-resisting factors in the process of heat transmission are mainly snow density and water content; and there is a zero boundary of heat flux of inductive heat and sensible heat in snow cover for the thermal exchange. In midwinter, the sublimation is higher than the evaporation. On the snow surface of seasonal snow cover (north-facing slope), and the monthly sublimation volume (subtracted by the evaporation volume) is 1-2 mm, whereas the evaporation is slightly higher than the sublimation on the south-facing slope.
【CateGory Index】： P343.6