Asymmetric Impacts of El Niño Development and Decay Stages on the Hadley Circulation
Asymmetric Impacts of El Niño Development and Decay Stages on the Hadley Circulation
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DOI：
10.1029/2023gl103861
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发表时间：
2023-06
影响因子：
5.2
通讯作者：
Juan Feng;Xuanliang Ji;Jianping Li;Enye He
中科院分区：
文献类型：
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作者：
Juan Feng;Xuanliang Ji;Jianping Li;Enye He
El Niño对哈德利环流（HC）的影响一直是先前研究的主题，但结果尚无定论。我们研究了El Niño在其周期的不同阶段如何影响HC。在发育年，HC异常呈赤道准对称型，而在衰减年，HC异常呈非对称型。这解决了之前关于El Niño对HC影响的研究之间的差异。El Niño不同阶段热带海温的差异导致海温经向梯度的差异，从而决定了辐合的位置。这解释了为什么在El Niño发育和衰减期间HC异常具有不同的空间结构。结果表明，El Niño不同阶段海温经向分布对经向环流的影响有显著差异，阐明了El Niño对气候影响的差异。
The impact of El Niño on the Hadley Circulation (HC) has been a topic of previous studies, but the results have been inconclusive. We study how El Niño affects the HC during different stages of its cycle. In development years, the HC anomaly shows an equatorial quasi‐symmetric pattern, while in decay years, it shows an asymmetric pattern. This resolves previous discrepancies among studies about El Niño's impacts on the HC. The differences in tropical sea surface temperature (SST) during different stages of El Niño cause differences in SST meridional gradients, which determine the location of convergence. This explains why the HC anomalies have different spatial structures during El Niño development and decay years. Our results show that the meridional distribution of SST during different El Niño stages has significantly distinct impacts on meridional circulation and clarify the differences in El Niño's effects on climate.