Amplification effect of intra-seasonal variability of soil moisture on heat extremes over Eurasia

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外文摘要：Drying soil has been conducive to a high frequency of extreme high-temperature events over many regions worldwide in recent decades.However,changes in the intraseasonal variability of soil moisture can also influence the likelihood of extremely high temperatures.Although previous investigators have examined the association between extremely high temperatures and large-scale atmospheric circulation variability,the role of land-atmosphere coupling dominated by soil moisture variability in extremely high temperatures,particularly over the Eurasian continent,is not well understood.In this study,on the basis of the Land Surface,Snow,and Soil Moisture Model Intercomparison Project,we found that land-atmosphere feedback amplified the variability of soil moisture in most regions of Eurasia during summer from 1980 to 2014.This amplification of soil moisture variability is closely correlated with more intensive intraseasonal variability of surface air temperature and more frequent occurrences of extreme high-temperature events,particularly in Europe,Siberia,Northeast Asia,and the Indochina Peninsula.This correlation implies that increasing the intraseasonal variability of soil moisture results in a high likelihood of heat extremes during summer in most parts of Eurasia except Asian desert areas.On the intraseasonal timescale,the land-atmosphere coupling increases the variability of surface sensible heat flux and net long-wave radiation heating the atmosphere by intensifying the soil moisture variability,thus amplifying the variability of surface air temperature and enhancing the extreme high-temperature days.This finding demonstrates the importance of changes in intraseasonal soil moisture variability for the increasing likelihood of heat extremes in summer.

外文关键词：

Soil moistureIntraseasonal variabilityLand-atmosphere couplingHeat extremes

作者：

Yi-Nuo WANG、Zhi-Yan ZUO、Liang QIAO、Kai-Wen ZHANG、Mei-Yu CHANG、Dong XIAO、Zou-Xing LIN、Huan WANG

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作者单位：

Department of Atmospheric and Oceanic Sciences,Institute of Atmospheric Sciences,Fudan University,Shanghai 200438,China

CMA-FDU Joint Laboratory of Marine Meteorology,Shanghai 200438,China

Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 211800,China

Shanghai Frontiers Science Center of Atmosphere-Ocean Interaction,Shanghai 200123,China

Chinese Academy of Meteorological Sciences,China Meteorological Administration,Beijing 100081,China

Key Laboratory of Cites'Mitigation and Adaptation to Climate Change in Shanghai,China Meteorological Administration,Shanghai 200030,China

National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary,Shanghai 202183,China

College of Geography and Resources Science,Sichuan Normal University,Chengdu 610101,China

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基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

项目编号：

2022YFF08017034217505341822503

出版年：

2024

DOI：

10.1016/j.accre.2024.01.008

气候变化研究进展(英文版)

国家气候中心

气候变化研究进展(英文版)

影响因子：0.806

ISSN：1674-9278

年,卷(期)：2024.15(1)

参考文献量2