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《Journal of Glaciology and Geocryology》 2003-05
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Water Balance of Huahai Lake Basin during a Special Phase

HU Gang\+1,\ WANG Nai\|ang\+2,\ ZHAO Qiang\+2, CHENG Hong\|yi\+2,\ CHEN Yong\|sheng\+2,\ GUO Jian\|ying\+2 Education of China, Beijing Normal University, Beijing 100875, China; 2. Resource and Environmental College of Lanzhou University, Lanzhou Gansu 730000, China)   
Hydrological and energy\|balance model, as a relatively mature method of paleo\|precipitation restoration, has been widely applied. The development of this mode and the paleo\|lake area and paleo\|precipitation of a special phase in Huahai Lake basin restored by this model on the basis of field investigation and analysis are introduced in this paper briefly. \ \ It is found that the Huahai Lake reached its maximum area at about 4 300 a BP, when its area reached about 445 km\+2. Ignoring the effect of meltwater in its basin, annual precipitation is primarily estimated to be 151mm at about 4 000 a BP, 132% higher than that at present. However in this basin, meltwater accounts for about 30% at present. Subtracting the effect of meltwater, the lake area was 419 km\+2 at about 4 000 a BP. In this model, the effect of glacier does not be considered owing to the difficult in directly determining the volume of glaciers, but the influence of meltwater on lake coefficient, a decreasing from 0\^0309 to 0\^0291, is considered. Based on this, annual precipitation is estimated to be 146 mm, 100\^6% higher than that at present. Meanwhile sensitivity analysis shows that cloudage is most sensitive to precipitation, followed by surface reflectivity, pressure of vapor and surface temperature. This provides the knowledge for researching the land degradation and desertification in this region, having an important significance for protecting and conducting ecological environments, which is one of the strategic emphases of developing Chinas west.
【Fund】: 国家重点基础研究发展规划项目(G2000048701);; 国家自然科学基金项目(40071031)资助
【CateGory Index】: P343.3
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