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中国沙漠  2015 

巴丹吉林沙漠周边地区降水量的时空变化特征

DOI: 10.7522/j.issn.1000-694X.2014.00064

Keywords: 巴丹吉林沙漠,降水量,年代际变化,东亚夏季风,沙尘暴

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Abstract:

分析了巴丹吉林沙漠周边17个常规气象测站1951-2005年的逐月降水量及沙尘暴频次和东亚夏季风指数.(1)沙漠周边地区降水量的空间分布明显受地形影响:紧靠沙漠的区域地势低、干旱,各季降水量都小;沙漠外围较远处(特别是受祁连山影响的西南边)地势高、湿润,各季降水量都大;地形增高会使降水量增多1个量级以上,但对其季节配额无明显影响.夏季降水量配额最大,平均高达61.6%.(2)依据各站降水量年际变化间的相关系数及测站间的地域关系和地貌相似程度,可将该区域划为4个分区:一为地势较低、紧挨沙漠、极为干旱的沙漠西北缘区,二为气候较湿、受祁连山影响的沙漠西南缘区(或称祁连山影响区),三为位于巴丹吉林沙漠和腾格里沙漠之间的民勤区,四为远离沙漠、但与其周边地区地貌相似的沙漠东侧区.(3)1951-2005年的各个年代,4个分区各季降水量由大到小的顺序均为:祁连山影响区、沙漠东侧区、民勤区和沙漠西北缘区,与其平均海拔由高到低的顺序一致;就各季降水量及其配额的年代际演变位相而言,祁连山影响区可以代表整个区域.(4)1971-2005年各分区年降水量呈增大趋势,春季降水量增加尤为显著(增幅约为0.41mm·a-1),夏季降水量有减小趋势;随海拔增高,春季及年降水量增幅加大,夏季降水量减幅减小;祁连山影响区对全区年降水量增大的贡献最大.(5)各季及年降水量与东亚夏季风的强弱间均呈复相关;其中冬、夏季及年降水量与夏季风间的负相关随海拔升高而加大,说明夏季风对沙漠以南高海拔处的降水影响更为显著.(6)各季沙尘暴与降水量间以负相关为主,各分区冬、春季降水量偏多时,其冬、春季及夏季沙尘暴的发生频次一般偏少.

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