What is the relationship between China summer precipitation and the change of apparent heat source over the Tibetan Plateau?
What is the relationship between China summer precipitation and the change of apparent heat source over the Tibetan Plateau?
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DOI：
10.1002/asl2.444
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发表时间：
2013-10
影响因子：
3
通讯作者：
Xiangde Xu;Chungu Lu;Yihui Ding;Xiaohui Shi;Yudi Guo;Wenhui Zhu
中科院分区：
文献类型：
--
作者：
Xiangde Xu;Chungu Lu;Yihui Ding;Xiaohui Shi;Yudi Guo;Wenhui Zhu
东亚夏季风近几十年来一直呈持续减弱的趋势，这是有据可查的。由于亚洲夏季风(包括东亚季风和南亚季风)是世界上最大、最显著的季风系统，其强度的变化可能会对全球天气和气候系统，特别是对南亚和东亚的降水格局产生深远的影响。另一方面，作为辽阔的高地，青藏高原形成了一个巨大的热源，凸现在自由的大气层中。在全球气候变化的背景下，这种加热的变化是否会影响亚洲夏季风的变化，从而影响降水的分布？结果表明，青藏高原的视热源与东亚夏季风环流密切相关，东亚夏季风的减弱与青藏高原视热源的减少趋势密切相关。进一步分析表明，中国近几十年来的雨型变化与东亚夏季风的减弱是一致的。
It is well documented that the East Asian summer monsoon has been experiencing a steady weakening trend in recent decades. Because the Asian summer monsoon (including both East Asian monsoon and South Asian monsoon) is the largest and most pronounced monsoonal system in the world, its change in strength may exert a profound impact on global weather and climate systems, especially on the rainfall pattern in South and East Asia. On the other hand, as a vast elevated landmass, the Tibetan Plateau forms a huge heat source protruding into the free atmosphere. Setting against the backdrop of global climate change, whether or not does the change of this heating affect the change of Asian summer monsoon and thus rainfall distribution? Here we show that the apparent heat source over the Tibetan Plateau is closely correlated with the East Asian summer monsoonal circulation, and that the weakening of the East Asian summer monsoon is closely associated with the decreasing trend of the Tibetan Plateau apparent heat source. Further analysis indicates that the change of rainfall pattern in China in recent decades is consistent with the decreasing of the East Asian summer monsoon.