Variations in equilibrium line altitude of the Qiyi Glacier,Qilian Mountains,over the past 50 years  

作　　者：WANG NingLian HE JianQiao PU JianChen JIANG Xi JING ZheFan 

机构地区：[1]State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy ofSciences, Lanzhou 730000, China

出　　处：《Chinese Science Bulletin》2010年第33期3810-3817,共8页

基　　金：supported by the Knowledge Innovation Program of the Chinese Academy of Sciences(KZCX2-YW-310);the National Basic Research Program of China(2005CB422003);the National Natural Science Foundation of China(40930526);the Special Program of the Ministry of Science and Technology of the People's Republic of China for Basic Works(2006FY1102007)

摘　　要：Based on observations of the equilibrium line altitude(ELA)of the Qiyi Glacier in the Qilian Mountain,we established a statistical model between ELA and its major influencing factors,warm season air temperature(air temperature averages for September,July and August)and cold season precipitation(total precipitation in the period January through March).Warm season air temperature was the leading climatic factor influencing ELA variations.The glacier ELA ascends(descends)172 m when warm season air temperature increases(decreases)by 1°C,and ascends(descends)62 m when cold season precipitation decreases(increases)by 10%.In the period 1958-2008,the glacier ELA showed a general increasing trend,ascending 230 m and reaching its highest altitude in 2006 at 5131 m a.s.l.,close to the glacier summit.If future climate is similar to that in the period 2001-2008,the Qiyi Glacier will not stabilize until it retreats by 2.08 km.Based on observations of the equilibrium line altitude （ELA） of the Qiyi Glacier in the Qilian Mountain, we established a statisti- cal model between ELA and its major influencing factors, warm season air temperature （air temperature averages for September, July and August） and cold season precipitation （total precipitation in the period January through March）. Warm season air tem- perature was the leading climatic factor influencing ELA variations. The glacier ELA ascends （descends） 172 m when warm sea- son air temperature increases （decreases） by I^C, and ascends （descends） 62 m when cold season precipitation decreases （in- creases） by 10%. In the period 1958-2008, the glacier ELA showed a general increasing trend, ascending 230 m and reaching its highest altitude in 2006 at 5131 m a.s.l., close to the glacier summit. If future climate is similar to that in the period 2001-2008, the Qiyi Glacier will not stabilize until it retreats by 2.08 km.

关 键 词：祁连山 冰川 高度变化 学业成绩 气温上升 平均气温 总降水量 气候因素 

分 类 号：P467[天文地球—大气科学及气象学] P343.6