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《Journal of Glaciology and Geocryology》 2003-04
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The Calculated ELA and Its Distribution Characteristics of the Glacier System in the Tarim River Basin

WANG Xin+1, XIE Zi-chu+2, FENG Qin-hua+2 (1. Hunan Science and Technology University, Xiangtan Hunan 412000, China;2. Hunan Normal University, Changsha Hunan 41008, China)  
According to the linear relationship between ELA-h and H-{me}, ELA-{hc} (calculated snow line) can be obtained. Based on calculation, the distribution of ELA-{hc} can be mapped. Further study about minimum glacier size of climate oriented in glacier system (S-{lim}) and climate snow line (H-{cli}) revealed: snow line. (1) The difference between average ELA-{hc} and average ELA-h in the glacier system was not more than 100 m (except 180 m for 5Y67) and the extracting roots of variances of the difference between ELA-{hc} and ELA-h were also acceptable (except less than 200 m for 5Y68). So the EL-{hc} were reliable. (2) It is found that small glacier's ELA-{hc} varies widely in the glacier system, but with glacier size enlarging, it will be fixed at a narrow range. From the variation of ELA-{hc} against glacier size in Tarim River branch glacier systems, bottom logarithm curve equation and top logarithm curve equation have been found out by edge glaciers in different glacier size. Then, the minimum glacier size of climate oriented in glacier system (S-{lim}) was defined as a certain glacier size, of which ELA-{hc} varies in a narrow range (about 400 m wide) with the glacier area increasing in terms of glacier system's bottom and top logarithm curve equation. It is another basic characteristic parameter of glacier system that the larger S-{lim} is, the more complicated glacier system is. (3) Influenced by climate causes and non-climate causes, the ELA-{hc} in glacier system distributes widely. But prevailing climate condition in a certain glacier system primarily controls the reducing of bottom curve and top curve. So the H-{cli} calculated from logarithm equations can be regarded as climate snow line of a glacier system. (4) Both the distributions of ELA-{hc} and H-{cli} show a varying trend from south to north. The H-{cli} goes down from about 5 700 m to 4 000 m as a whole with latitude; and the H-{cli} also differs from west to east with increasing longitude because of water vapor changing from west to east.
【Fund】: 国家自然科学基金资助项目 (40 14 10 0 3) ;; 国家自然科学基金重大项目 (90 2 0 2 0 13) ;; 中国科学院知识创新工程重大项目(KZCX1 30 1)资助
【CateGory Index】: P343.6
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