基于2001～2009年MODIS资料的西藏地区大气可降水量分布特征

Distributions of Atmospheric Precipitable Water in Tibet Region Based on MODIS Data during 2001~2009

摘要: 利用2001~2009年MODIS近红外的大气可降水的逐月资料,分析了西藏地区大气可降水量时空分布特征及与实际降水量之间的关系。结果表明:西藏大气可降水量时空分布不均匀,空间分布由东南至西北递减;7、8月份大气可降水量最大,夏季大气可降水量占全年的50%;2001~2009年间西藏大气可降水量呈增加趋势,阿里地区、山南地区以及昌都地区增加明显;大气可降水量与实际降水量呈明显负相关,相关系数为-0.688。

Abstract: This paper investigated the spatial and temporal distribution of atmospheric precipitable water(APW) and the connection with natural precipitation in Tibet region using near-infrared monthly MODIS data from 2001 to 2009.Resultsshow that APW is unevenly distributed in Tibet region,APW is gradually decreasing from the southeatern to the northwetern part;APW reached a peak in July and August,and summer APW accounts for 50% of the whole year;APW of 2001~2009 increased in Tibet region,and partial area increased obviously such as Ali,Linzhi and Changdu;APW was negatively related to natural precipitation,with the correlation coefficient-0.688.