Record-breaking summer-autumn drought in southern China in 2022: Roles of tropical sea surface temperature and Eurasian warming

IF 6 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Science China Earth Sciences Pub Date : 2024-01-18 DOI:10.1007/s11430-023-1242-8
Yuepeng Hu, Botao Zhou, Huijun Wang, Dapeng Zhang
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Abstract

From summer to autumn in 2022, a severe drought lasted in southern China, posing serious effects on economic growth and ecological systems. This study explored the atmospheric circulations accounting for this persistent drought event. It shows that the drought in southern China during the summer of 2022 was strongly linked to the divergence of water vapor flux and descending motions, which were respectively caused by the anomalous anticyclone over the western North Pacific and the northward movement of the East Asian subtropical jet (EASJ). Differently, the atmospheric background responsible for the sustained drought in autumn is manly featured by a cyclonic circulation anomaly over the region from the Bay of Bengal to the South China Sea, which led to decreased moisture and descending motions in southern China. Further investigation suggests that the rarely strong surface warming over northern Eurasia and the extreme La Niña-like pattern over the tropical Pacific jointly resulted in the anomalous anticyclone over the western North Pacific and the northward shift of the EASJ in the summer of 2022, while the cyclonic circulation anomaly prevailing over the region from the Bay of Bengal to the South China Sea in autumn was largely attributed to the extremely negative anomalies of the tropical Indian Ocean sea surface temperature.

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2022 年中国南方夏秋干旱创纪录:热带海洋表面温度和欧亚大陆变暖的作用
2022 年夏季至秋季,中国南方持续发生严重干旱,对经济增长和生态系统造成了严重影响。本研究探讨了造成此次持续干旱的大气环流。研究表明,2022 年夏季华南地区的干旱与水汽通量和降水运动的分异密切相关,而水汽通量和降水运动的分异分别由北太平洋西部的异常反气旋和东亚副热带喷流(EASJ)的北移引起。不同的是,造成秋季持续干旱的大气背景主要是孟加拉湾至南海区域的气旋环流异常,导致华南地区水汽减少和降水运动。进一步的研究表明,欧亚大陆北部罕见的强烈地表增温和热带太平洋的极端拉尼娜模式共同导致了2022年夏季北太平洋西部的反气旋异常和EASJ的北移,而秋季孟加拉湾至南海区域的气旋环流异常主要归因于热带印度洋海面温度的极度负值异常。
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来源期刊
Science China Earth Sciences
Science China Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
9.60
自引率
5.30%
发文量
135
审稿时长
3-8 weeks
期刊介绍: Science China Earth Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
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