Study on the Zone of Maximum Precipitation in the North Slopes of the Central Qilian Mountains
Study on the Zone of Maximum Precipitation in the North Slopes of the Central Qilian Mountains
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发表时间：
2009
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通讯作者：
Chen Liang
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作者：
Chen Liang
2006年6月至2008年9月，对祁连山中部北坡黑河上游流域降水空间变化进行了调查，观测资料发现：1）中海拔地区夏季降水量自东向西呈递减趋势，递减幅度约为80 mm·（100 km-1）；2）降水量最大区位于中海拔地区。 海拔4 500～4 700 m（年降水量485 mm），恰逢最大相对湿度区（海拔4 400 m以上，中心高度4 600 m海拔）和夏季0℃高度（海拔4 680 m左右）。降水发生日内不同高度点,可推算出平均降水量 2008年夏季凝结高度为4 900 m a.s.l.,后有零星下降至4 460 m a.s.l.的可能。在最大降水区研究山区,年平均降水量随高度增加而增加,增幅为17.2 mm·(100 m-1),夏季降水量增加,增幅为11.5 mm·(100 m)-1。
During the period of June 2006 through September 2008,an investigation in spatial variations in precipitation in the upper catchment of the Heihe River in the north slopes of the central Qilian Mountains was conducted.Based on the data observed,it was found that: 1) summer precipitation displayed a decreasing trend from east to west in the intermediate altitude with a rate of approximately 80 mm·(100 km-1);2) the zone of maximum precipitation lay between 4 500 to 4 700 m a.s.l.(where annual precipitation is 485 mm),which coincided with the zone of maximum relative humidity(above 4 400 m a.s.l.,with a central height of 4 600 m a.s.l.) and the height of 0 ℃ in summer(about 4 680 m a.s.l.).By analysis of the difference between air temperature and dew point at different heights in the days that precipitation occurred,it is deduced that the average condensation height was 4 900 m a.s.l.in the summertime of 2008,and it might decrease to 4 460 m a.s.l.sporadically.In the studied mountainous area under the zone of maximum precipitation,mean annual precipitation increased with the height with a rate of 17.2 mm·(100 m-1),and summer precipitation increased with a rate of 11.5 mm·(100m)-1.