A Strong Negative Mass Balance Recently Appeared in the Glacier No.1 at the Headwaters of the ürümqi River
JIAO Ke-qin; WANG Chun-zu; HAN Tian-ding (Lanzhou Institute of Glaciology and Geocryology, CAS, Lanzhou Gansu 730000, China)
Based on the observation in 1996 / 1997 and 1997 / 1998, mass balances of the Glacier No. 1 at the Headwaters of the ürümqi River were calculated as -853.0 mm and - 789.9 mm. Since 1959, the negative value of mass balance in 1996 / 1997 has been the maximum, next to that in 1997 / 1998. By analyzing air temperature and precipitation in the region, it is found that the main factor resulting in this phenomenon is abnormal temperature, especially the abnormal summer temperature.