Significant Contribution of Stratospheric Water Vapor to the Poleward Expansion of the Hadley Circulation in Autumn Under Greenhouse Warming
Significant Contribution of Stratospheric Water Vapor to the Poleward Expansion of the Hadley Circulation in Autumn Under Greenhouse Warming
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温室增温下平流层水汽对秋季哈德来环流向极地扩张的显着贡献
DOI：
10.1029/2021gl094008
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发表时间：
2021-08
影响因子：
5.2
通讯作者：
Cheng Sun
中科院分区：
文献类型：
--
作者：
Yan Xia;Yuwei Wang;Yi Huang;Yongyun Hu;Jianchun Bian;Chuanfeng Zhao;Cheng Sun
在过去的十年里，哈德利环流的扩大和与之相关的副热带干旱区的极地移动吸引了广泛的研究。研究发现，Hadley环流的极地扩张具有很强的季节性，且在两个半球的秋季达到最大值，这是对四倍CO2的响应。我们发现，秋季的极地扩张与平流层水汽(SWV)的增加密切相关。SWV的增加使平流层尤其是极地低平流层辐射降温，从而导致秋季Hadley环流变宽。SWV效应在一组SWV锁定实验中得到了肯定。结果表明，SWV的增大导致秋季两半球Hadley环流向极地扩展，约占秋季CO2增加4倍所致总扩展的30%。
Widening of the Hadley circulation and associated poleward shifts of subtropical dry zones have drawn extensive studies in the past decade. It is found that the poleward expansion of the Hadley circulation has strong seasonality and peaks in autumn in both Hemispheres in response to quadrupling CO2. Here we find that the poleward expansion in autumn is closely related to the increase of stratospheric water vapor (SWV). The SWV increase radiatively cools the stratosphere especially in the polar lower stratosphere, which consequently leads to widening of the Hadley cell in autumn. The SWV effect is affirmed in a set of “SWV‐locking” experiments. It is found that the SWV increase leads to a poleward expansion of the Hadley circulation in autumn in both Hemispheres, which contributes about 30% of the total expansion due to quadrupling CO2 in autumn.
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DOI：
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发表时间：
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期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
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影响因子：
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发表时间：
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期刊：
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影响因子：
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