摘要
根据ELAh与Hme之间存在较好的线性关系 ,计算了塔里木河全流域冰川系统所有冰川的平衡线高度ELAhc.在此基础上分析流域平衡线分布特征 ,探讨极限面积 (Slim)与导出雪线 (Hcli)等参数同冰川系统的关系 .结果表明 :冰川系统中 ,当冰川规模不低于某极限面积时 ,其平衡线高度会趋近到导出雪线高度 .整个流域导出雪线高度分布受热量条件控制 ,呈现纬度地带性 ,又由于东西水分条件的差异 ,经度地带性也较明显 .
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.
出处
《冰川冻土》
CSCD
北大核心
2003年第4期380-388,共9页
Journal of Glaciology and Geocryology
基金
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
