塔克拉玛干沙漠及其周边山区水汽时空分布特征

The Temporal and Spatial Distribution Characteristics of Precipitable Water in Taklimakan Desert and the Surrounding Mountains

利用沙漠腹地地基GPS数据、周边探空资料、MODIS近红外水汽数据,分别对塔克拉玛干沙漠的水汽进行初步分析,以期了解该区域的大气可降水量的时空分布特征。通过对塔克拉玛干沙漠及周边山区大气可降水量结果的分析可知,塔克拉玛干沙漠为西北地区大气可降水量的相对高值区,水汽值普遍高于其周边山区;沙漠西南部靠近青藏高原一带为水汽的低值区。无论是塔克拉玛干沙漠还是周边山区,大气可降水量的年内变化都是一致的,夏季最大,秋季高于春季,冬季大气可降水量最低。

The precipitable water（PW）of Taklimakan Desert was analyzed by GPS data,the radiosonde data and remote sensing of PW in near IR from MODIS in order to understand spatial and temporal distribution characteristics of PW in this area.The analysis results of atmospheric precipitation indicated that： Taklimakan Desert is a relatively high value area of PW in northwest,and the value of PW is higher than the surrounding mountains;the areas of southwestern Taklimakan Desert where near to Qinghai-Tibet Plateau is a low value area of PW.No matter in Taklimakan Desert or in the surrounding mountains,the inner annual PW variation is accordance,namely highest in summer,lowest in winter,autumn is higher than spring.