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《Arid Zone Research》 2008-03
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Study on Snowline and Climate Changes during Different Ice Ages in the Qilian Mountains since Pleistocene

XIAO Qing-hua,ZHANG Wang-sheng,ZHANG Wei,ZHU Chuang-xin,WANG Jie (College of Earth Sciences,China University of Geosciences,Wuhan 430074,China)  
In this paper,the degressive altitude of snowline and the corresponding change of temperature and precipitation in the Qilian Mountains during five ice ages since Pleistocene are lucubrated.The results are as follows:(1) The degressive altitude of snowline in the Qilian Mountains was decreased from the earliest ice age to the latest ice age,which reveal that the snowline altitude has been continuously increased and the glacier size has been reduced under global climate change since Pleistocene;(2) Change of snowline is closely related to the change of precipitation and temperature,for example,the degressive altitude of snowline in the mountains during the third ice age from now was the most significant because of the low temperature and more precipitation,whereas the size of glaciers during the second ice age from now did not exceed that during the third ice age from now under lower temperature but less precipitation;(3) It is considered that the periodical change of solar radiation is the main cause resulting in climate change and alternation of ice ages and interglacial ages.Moreover,the uplift of the Qinghai-Tibetan Plateau brings about the changes the atmospheric circulation,temperature and precipitation as well as snowline,so it is also an important factor affecting climate and snowline changes.
【Fund】: 中国地质调查局“1∶250000民和县幅数字地质填图”(200213000016)资助
【CateGory Index】: P343.6
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