首页|Leading Pattern of Spring Drought Variability over East Asia and Associated Drivers

Leading Pattern of Spring Drought Variability over East Asia and Associated Drivers

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Drought events have become more frequent and intense over East Asia in recent decades,leading to huge socioeconomic impacts.Although the droughts have been studied extensively by cases or for individual regions,their leading variability and associated causes remain unclear.Based on the Standardized Precipitation Evapotranspiration Index(SPEI)and ERA5 reanalysis product from 1979 to 2020,this study evealuates the severity of spring droughts in East Asia and investigates their variations and associated drivers.The results indicate that North China and Mongolia have ex-perienced remarkable trends toward dryness during spring in recent decades,while southwestern China has witnessed an opposite trend toward wetness.The first Empirical Orthogonal Function mode of SPEI variability reveals a similar seesawing pattern,with more severe dryness in northwestern China,Mongolia,North China,South Korea,and Japan but increased wetness in Southwestern China and southeast Asia.Further investigation reveals that the anomalously dry(wet)surface in North(Southwestern)China is significantly associated with anomalously high(low)temperature,less(more)precipitation,and reduced(increased)soil moisture during the previous winter and early spring,regulated by an anomalous anticyclone(cyclone)and thus reduced(increased)water vapor convergence.The spring dry-wet pattern in East Asia is also linked to cold sea surface temperature anomalies in the central-eastern Pacific.The findings of this study have important implications for improving the prediction of spring drought events in East Asia.

droughtleading patternEast Asiaspringdrivers

赵庆红、杨崧、田红瑛、邓开强

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School of Atmospheric Sciences,Sun Yat-sen University,and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai,Guangdong 519082 China

Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies,Sun Yat-sen University,Zhuhai,Guangdong 519082 China

College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000 China

国家自然科学基金国家自然科学基金Guangdong Major Project of Basic and Applied Basic ResearchGuangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesInnovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Open Fund of State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,MNRFuture Earth Early-Career Fellowship of the Future Earth Global Secretariat Hub China

42230603422750202020B03010300042020B1212060025311021001QNHX2310

2024

热带气象学报(英文版)
中国气象局广州热带海洋气象研究所

热带气象学报(英文版)

影响因子：0.169
ISSN：1006-8775
年,卷(期)：2024.30(1)
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