Some Changing Characteristics of Glacier Streamflow in Northwest ChinaYE Baisheng HAN Tianding DING Yongjian
(Lanzhou Institute of Glaciology and Geocryology， Chinese Academy of Sciences, Lanzhou 730000)
Based on the records of glacierstreamflow in the upper Urumqi River and in otherareas of Northwest China, the paper analyzed thechange of glacier streamflow and its effect on alpinestreamflow. Results show that the streamtlow fromGlacier No.1 in the source of the Urumqi River is61% higher than that from non-glacial area in thesame condition, of which 92% is produced by retreatof glacier.In the whole Northwest China, increase ofthe streamflow produced by retreating glacier sincethe 1950s or earlier can not be obtained because ofshort of hydrological record. However, increasingstreamflow produced by climate warming since themiddle of the 1970s has appeared in Tarim catchmentwhere supply of glacier runoff is abundant. Particularly in the area with glacier coverage higher than 5%, inAugust, the month with maximum glacier runoff, precipitation reduced, temperature rised and the alpinestreamflow markedly increased in 1977-1989 as compared with 1956-1976. Through analyzing mass bal-ance by various methods, it is found that glacierstreamflow will increase by 50% of the present glacierstreamflow as temperature rises by 1C, indicatingthat existence of glacier can relieve partially the impact of climate warming on water resources in Northwest China.