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A Study on the Trend of the Upper Tropospheric Water Vapor over the Tibetan Plateau in Summer
Asia-Pacific Journal of Atmospheric Sciences ( IF 2.3 ) Pub Date : 2020-04-21 , DOI: 10.1007/s13143-020-00191-5
Xiran Xu , Hongying Tian , Kai Qie , Xin He , Ruhua Zhang , Houwang Tu

Using ERA-Interim and ERA-5 reanalysis datasets combined with measurements from the Microwave Limb Sounder (MLS), we divided the Tibetan Plateau (TP) into three regions to analyse the long-term trends of water vapor in the upper troposphere and its possible mechanisms. The conclusions are as follows. The water vapor at 200 hPa in the summers from 1979 to 2016 over Region 1 (34°N-40°N, 80°E-100°E) shows a positive trend, which is caused by the rising surface temperature and the northward shift of the South Asian High (SAH). The positive trend of water vapor over Region 2 (28°N-33°N, 80°E-90°E) is attributed to the enhanced South Asian summer monsoon, which leads to increases in horizontal transport of water vapor and vertical water vapor flux. The increase in the vertical transport of water vapor is responsible for the increase in water vapor over the Region 2. The negative trend of water vapor over Region 3 (27°N-30°N, 93°E-98°E) is mainly due to the weakening of water vapor transport caused by the weakening of convective activities.



中文翻译:

夏季青藏高原对流层高层水汽变化趋势研究

使用ERA-Interim和ERA-5再分析数据集,结合微波四肢测深仪(MLS)的测量结果,我们将青藏高原(TP)分为三个区域,以分析对流层上部水蒸气的长期趋势及其可能的趋势。机制。结论如下。1979年至2016年夏季1区(34°N-40°N,80°E-100°E)上200 hPa的水蒸气显示出正趋势,这是由于地表温度升高和北移南亚高压(SAH)。地区2(28°N-33°N,80°E-90°E)上水汽的积极趋势归因于南亚夏季风的增强,这导致水汽的水平输送和垂直水汽的增加通量。

更新日期:2020-04-21
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