Recent Changes in Precipitation Extremes in the Heihe River Basin,Northwest China

查看全文 作　　者：CHENG [1,2]Aifang;FENG [1]Qi;Guobin [3]FU;ZHANG [4]Jiankai;LI [1,2]Zongxing;HU [5]Meng;WANG [1,2]Gang

机构地区：[1]Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences;[2]University of Chinese Academy of Sciences;[3]CSIRO Land and Water Flagship;[4]School of Atmospheric Sciences,Lanzhou University;[5]Guangzhou Meteorological Satellite Ground Station

出　　处：《Advances in Atmospheric Sciences》索引2015年第32卷第10期,共16页

基　　金：supported by the Key Project of the Chinese Academy of Sciences (Grant No.KZZDEW-04-05);supported by the Australia–China Joint Research Centre on River Basin Management 摘　　要：Changes in rainfall extremes pose a serious and additional threat to water resources planning and management,natural and artificial oasis stability,and sustainable development in the fragile ecosystems of arid inland river basins. In this study,the trend and temporal variation of extreme precipitation are analyzed using daily precipitation datasets at 11 stations over the arid inland Heihe River basin in Northwest China from 1960 to 2011. Eight indices of extreme precipitation are studied.The results show statistically significant and large-magnitude increasing and decreasing trends for most indices,primarily in the Qilian Mountains and eastern Hexi Corridor. More frequent and intense rainfall extremes have occurred in the southern part of the desert area than in the northern portion. In general,the temporal variation in precipitation extremes has changed throughout the basin. Wet day precipitation and heavy precipitation days show statistically significant linear increasing trends and step changes in the Qilian Mountains and Hexi Corridor. Consecutive dry days have decreased obviously in the region in most years after approximately the late 1980 s,but meanwhile very long dry spells have increased,especially in the Hexi Corridor. The probability density function indicates that very long wet spells have increased in the Qilian Mountains. The East Asian summer monsoon index and western Pacific subtropical high intensity index possess strong and significant negative and positive correlations with rainfall extremes,respectively. Changes in land surface characteristics and the increase in water vapor in the wet season have also contributed to the changes in precipitation extremes over the river basin. 关键词：中国西北地区流域降水黑河流域干旱内陆流域西太平洋副热带高压极值脆弱生态系统河西走廊

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Recent Changes in Precipitation Extremes in the Heihe River Basin,Northwest China

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