Impacts of regional uplift of the Tibetan Plateau on local summer precipitation and downstream moisture budget: A simulation study
Impacts of regional uplift of the Tibetan Plateau on local summer precipitation and downstream moisture budget: A simulation study
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青藏高原区域隆升对局地夏季降水及下游水分收支的影响模拟研究
DOI：
10.1002/joc.7781
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发表时间：
2022-06
期刊：
影响因子：
--
通讯作者：
Yanwei Li
中科院分区：
文献类型：
--
作者：
Kai Yang;Jinghua Chen;Chunsong Lu;Junjun Li;Tianyu Liu;Liping Deng;Yanwei Li
利用天气研究与预报模式（Weather Research and Forecasting，WRF）进行了一系列敏感性试验，研究了青藏高原地形抬升对区域气候变率的影响。TP南坡的存在有利于南亚高压的维持和发展，使南亚高压与局地降水之间产生正的循环响应，从而使南亚夏季风北方分支维持水汽供应。同时，青藏高原南坡对中纬度对流层异常气旋和反气旋系统有积极影响，促进东亚夏季风向下游推进，有利于水汽和对流云向下游输送。TP平台的作用主要是由于其局部加热产生的水汽抬升，有利于形成局部对流云和降水，同时引起对流层的非绝热变暖。从TP输送的水汽可能影响中国中东部地区的降水。而华南地区的水汽供应主要来自东南沿海地区。青藏高原敏感区的存在对水汽输送路径有影响，消除高原敏感区有利于增加夏季降水和对流云。地形扰动的消除有利于中纬度地区水汽的辐合和扩散。中纬度动力异常可能与低纬度动力系统形成对峙。这导致降水和对流生成过程效率低下，陆地上的季风减弱，降雨带南移。
Using the Weather Research and Forecasting (WRF) model, a series of sensitivity experiments were conducted to study the individual and overall effects of the various topographic uplifts of the Tibetan Plateau (TP) on regional climate variability. The presence of the southern slope of the TP facilitates the maintenance and development of the South Asia High (SAH), which produces a positive cyclic response between local precipitation and SAH, so that the northern branch of the South Asian summer monsoon (SASM) maintains the water vapor supply. At the same time, the southern slope of the TP has a positive effect on the mid‐latitude tropospheric anomalous cyclone and anticyclone systems which promotes the downstream advancement of the East Asian summer monsoon (EASM) and is favourable for the transfer of water vapor and convective clouds downstream. The role of the TP platform is mainly due to the lifting of moisture generated by its local heating, which favours the formation of local convective clouds and precipitation while causing nonadiabatic warming of the troposphere. Water vapor transported from the TP could affect precipitation in central‐eastern China (CEC). However, the supply of water vapor in Southern East China (SEC) mainly comes from the southeast coast of China. The Tibetan Plateau sensitive areas (TPSA) have impacts on the water vapor transport path. Removing the TPSA favours an increase in precipitation and convective clouds in SEC. The removal of topographic disturbances favours the convergence and dispersion of water vapor at mid‐latitudes. The mid‐latitude dynamical anomaly may form a standoff with the low‐latitude dynamical system. This leads to inefficient precipitation and convective generation processes, a weakened monsoon advance over land, and a southward shift in the rainfall belt.
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DOI：
10.1002/joc.7162
发表时间：
2021-05
期刊：
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影响因子：
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