TRMM降雨数据在甘肃省干旱监测中的应用  

Drought Monitoring Based on TRMM Precipitation Data in Gansu Province

作　　者：胡蝶[1] 郭铌[1] 王丽娟[1] 沙莎[1] 王玮[1] 芦亚玲[1] 王芝兰[1] 

机构地区：[1]中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点实验室,甘肃兰州730020

出　　处：《干旱气象》2017年第3期374-382,共9页Journal of Arid Meteorology

基　　金：甘肃省气象局气象科研项目(GSMAMs2016-15);干旱气象科学研究基金项目(IAM201411);公益性行业(气象)科研专项(重大专项)(GYHY201506001-5)共同资助

摘　　要：热带降雨测量卫星(tropical rainfall measuring mission,TRMM)的微波数据能够提供高时空覆盖性的降水速率数据,可用于区域尺度的干旱监测。选取甘肃省为研究区域,利用28个气象站降雨资料对TRMM月降雨产品进行相关性分析,同时计算站点标准化降水指数(SPI)检验基于TRMM数据构建的降水距平百分率(Pa_TRMM)和降水状态指数(PCITRMM)监测干旱变化的时间序列信息,进一步分析区域干旱时空变化规律。结果表明:(1)TRMM数据精度较高,月降水、年降水数据的相关系数R分别为0.92和0.95,均通过α=0.01显著性检验;(2)Pa_TRMM、PCITRMM与SPI指数的逐月变化有较好一致性,能够有效监测干旱事件;(3)Pa_TRMM和PCITRMM监测出的2000年甘肃省春旱和盛夏旱以及2009年春夏连旱的发生发展过程与实况相符,只是在干旱程度的监测上略有差异。Tropical rainfall measuring mission（ TRMM） can provide high spatial and temporal coverage rate of precipitation data which can be used in drought monitoring of the regional scale. Gansu Province was selected as the research area,the monthly rainfall products from TRMM were compared with rainfall data from 28 meteorological stations,and the standardized precipitation index（ SPI） calculated from observations was used to test the precipitation anomaly percentage（ Pa_TRMM） and precipitation condition index（ PCITRMM）based on TRMM data which were applied in the monitoring of drought change over time,furthermore analysis of time and space change rule of drought was carried out. The results are as follows：（ 1） The accuracy of TRMM data was higher,and correlation coefficients of monthly precipitation and annual precipitation were 0. 92 and 0. 95,respectively,and both of them passed 0. 01 significance test.（ 2）The monthly changes of Pa_TRMMand PCITRMMhad a good consistency with the SPI index,and they could monitor the drought event effectively.（ 3） Development processes of spring and summer drought in 2000 and 2009 in Gansu were monitored by Pa_TRMMand PCITRMM,which was consistent with the actual,and only had a slight difference in the degree of drought monitoring.

关 键 词：TRMM 降雨 干旱监测 应用 

分 类 号：P426.6[天文地球—大气科学及气象学] P458.1