The analysis of water vapor distribution over Taklimakan Desert
The analysis of water vapor distribution over Taklimakan Desert
复制标题
塔克拉玛干沙漠水汽分布分析
DOI：
10.1007/s11430-011-4251-9
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发表时间：
2012-03-01
影响因子：
5.7
通讯作者：
Zhao Ling
中科院分区：
文献类型：
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作者：
Liu XiaoYang;Mao JieTai;Zhao Ling
迄今为止，对塔克拉玛干沙漠地区水汽分布的分析仅依赖于有限的地面观测和多位于外缘的无线电探测。利用FY 2C静止卫星分裂窗通道与地面GPS水汽测量相结合，建立了一种高时空分辨率的沙漠水汽反演方法。结果表明，塔克拉玛干沙漠上空的水汽分布受地形和下垫面性质的影响很大。外缘区域通常比内部区域具有更多的水蒸气。在外缘区，西部的水汽比东部多，北方的水汽比南部多。最干旱的地区位于塔中以南，和田河以东，一直延伸到沙漠的南边界。与其他地方类似，即使在沙漠最干燥的内部地区，沙漠地区的水汽也表现出日、月、季和年的变化。夏季水汽沿着西风带自西向东长距离输送，高度在700-400 hPa之间，平均速度为50 km h−1。
Up to now, all analysis of the distribution of water vapor over the Taklimakan desert area only depends on limited ground measurements and radio soundings setting mostly on the outer margin area. This paper establishes an approach to retrieve the water vapor over the desert at high temporal and spatial resolutions by the use of FY2C geostationary satellite split-window channels in cooperation with ground-based GPS water vapor measurement. Results show that the water vapor distribution over the Taklimakan desert is affected highly by topography and surface properties. The outer margin area has generally more water vapor than the inner area. Over the outer margin area, the western part has more water vapor than the eastern part, and the northern part has more than the southern part. The driest area lies to the south of Tazhong, east of Hotan River, and extended to the south boundary of the desert. Similar to elsewhere, water vapor over the desert area shows diurnal, monthly, seasonal and annual variations even at the driest inner area of the desert. In summer, the water vapor is transported from west to east over a long distance along the westerlies at a height between 700–400 hPa and with the average speed of 50 km h−1.