库姆塔格沙漠周边地区极端降水的时空变化特征  

Temporal and Spatial Variability of the Extreme Precipitation around the Kumtag Desert

作　　者：胡钰玲 宁贵财 康彩燕 王式功[2,1] 尚可政[1] 杨旭[1] 

机构地区：[1]兰州大学大气科学学院/甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730000 [2]成都信息工程大学大气科学学院,四川成都610041

出　　处：《中国沙漠》2017年第3期536-545,共10页Journal of Desert Research

基　　金：国家重点研发计划重点专项(2016YFA0602004);科技基础性工作专项(2012FY111700)

摘　　要：根据中国气象局信息中心提供的库姆塔格沙漠周边地区20个气象站1960—2014年逐日降水量资料,分析了库姆塔格沙漠周边地区1960—2014年极端降水的时空变化特征。结果表明:(1)库姆塔格沙漠周边地区极端降水主要集中在夏季且存在很大的地域性差异。(2)1960—2014年库姆塔格沙漠周边地区极端降水事件、年大雨频次、年大降水事件降水量和年降水量显著增加。(3)库姆塔格沙漠周边地区西部极端降水主要由频数很少的暴雨贡献,而东部极端降水则由暴雨和大雨共同贡献。(4)库姆塔格沙漠周边地区极端降水指数在夏季和年尺度的空间分布相似,且强降水指数在年和夏季尺度的空间分布均呈"鞍型场"型。Daily precipitation data of 20 meteorological stations from 1960 to 2014 was used to analyze tempo- ral and spatial variability of the extreme precipitation around the Kumtag Desert. The results show that： （]） The extreme precipitation events around the Kumtag Desert mainly were concentrated in summer. There are spatial differences for the extreme precipitation events. （2） The annual extreme precipitation events frequency, annual heavy rain frequency, annual heavy rain precipitation and annual precipitation increased significantly during nearly 55 years around the Kumtag Desert. （3） The extreme precipitation is mainly con- tributed by rainstorm in the west Kumtag Desert, and the extreme precipitation is contributed by rainstorm and heavy rain in the east Kumtag Desert. （4） The distribution of the trend coefficients of extreme precipi- tation indices at summer timescale is similar to that at year timescale. Moreover, they both act as a ＂saddle＂ shaped field.

关 键 词：库姆塔格沙漠 极端降水指数 极端降水事件 趋势系数 时空变化 

分 类 号：P467[天文地球—大气科学及气象学]