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《Journal of Glaciology and Geocryology》 2008-03
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Climate Characteristics of Snowfall over the Qilian Mountain and Its Ambient Areas

LI Yan-ying1,2,3,ZHANG Qiang1,3,SUN Ai-zhi4,ZHANG Yihai2,LI Ling-ping2 (1.Key Laboratory of Arid Climate Change and Reducing Disaster,Lanzhou Institute of Arid Meteorology,China Meteorological Administration,Lanzhou Gansu 730020,China;2.Wuwei Meteorological Bureau of Gansu Province,Wuwei Gansu 733000,China;3.Atmospheric Science College of Lanzhou University,Lanzhou Gansu 730000,China;4.School of Geography Science,Southwest University,Chongqing 400715,China)  
Daily snowfall data of nighttime (20pm~08am),daytime(08am~20pm) and full day(20pm~20pm) during winter(from November to February) from 1960 to 2004 from 55 meteorological stations in the Qilian Mountain and ambient areas(90°~104° E,32°~42° N)are analyzed for the temporal and spatial distribution characteristics of various snowfall intensities,snowstorm weather impact systems and terrain influence.It is found that in the Qilian Mountain the number of middling snowfall days is most correlated to snowfall,with a correlation coefficient of 0.87 and the most snowfall days occurring in northeast.In various regions the least snowfall days appear in the west,the least intensity appears in the middle,but the most flurry days appear in the middle,middling snowfall is more and stronger in the middle and south,heavy snow and snowstorm are most in the north,and the most strong ones in the south.Nighttime snow days are more obviously,nighttime flurry and middling snowfall are stronger than those in daytime.As to annual variation,the annual snowfall is increasing continuously in the west,the least snow occurred in the 1970s in the middle areas and in the 1990s in the north,but the most occurred in the 21 century in the west,north and middle,a peak occurred in the 1970s in the south,and then was decreasing continuously.In the inter-annual variation,there are obvious periods of 3~4 years,5~7 years and 12~14 years for the snowfall days.The primary weather backgrounds of snowstorm are types of north horizontal trough pressing southwards and type of Xinjiang cold trough developing and moving eastwards,account for 38.1% and 52.4%,respectively.All snowstorms occurred in the mountain windward slopes of winter monsoon and gorges.
【Fund】: 国家科技攻关计划“西部开发科技行动”重大项目“祁连山空中云水资源开发利用研究”(2004BA901A16)资助
【CateGory Index】: P426.63
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