首页|Winter extreme precipitation over the Tibetan Plateau influenced by Arctic sea ice on interdecadal timescale

Winter extreme precipitation over the Tibetan Plateau influenced by Arctic sea ice on interdecadal timescale

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The Tibetan Plateau(TP)and the Arctic are the most sensitive regions to global climate change.However,the interdecadal varibility of winter extreme precipitation over the TP and its linkage with Arctic sea ice are still unclear.In this study,the characteristics and mechisnems of the TP extreme precipitation(TPEP)influenced by Arctic sea ice on interdecadal timescale are studied based on the daily precipitation,monthly sea ice concentration and ERA5 reanalysis data from 1980 to 2018.We found that the dominant mode of the TPEP in winter mostly exhibits a uniform spatial variation on the interdecadal timescale,with an opposite weak variation in the southeastern TP,and the Arctic sea ice concentration(SIC)before 2002 are larger than that after 2003.The interdecadal variation of TPEP is affected by two teleconnection wave trains regulated by the Barents and Kara Sea ice.In the light ice years,a remarkable positive geopotential height(HGT)anomaly appears over the Barents-Kara Sea and a remarkable negative HGT anomaly is located over the Lake Baikal.Two wave trains originating over the Barents-Kara Sea can be observed.The southern branch forms a wave train through the North Atlantic along the subtropical westerly jet stream,showing a'+-+-+'pattern of HGT anomalies from Arctic to the TP.Negative HGT anomaly controls the western TP,which creates dynamic and water vapor conditions for the TPEP.The northern branch forms a wave train through the Lake Baikal and the southeast of the TP,showing a'+-+'HGT anomaly distribution.Positive HGT anomaly controls the southeastern TP,which is not conducive to precipitation in the region.When the SIC in the Barents-Kara Sea increases,the situation is opposite.The above analysis also reveals the reason for the difference in the east-west distribution of the TPEP.

Arctic sea iceTibetan PlateauWinter extreme precipitationRossby wave activityInterdecadal variation

Qing-Quan LI、Miao BI、Song YANG、Qing-Yuan WU、Yi-Hui DING、Xin-Yong SHEN、Xiao-Ting SUN、Meng-Chu ZHAO

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China Meteorological Administration Key Laboratory for Climate Prediction Studies,National Climate Centre,Beijing 100081,China

Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,China

CMA Key Open Laboratory of Transforming Climate Resources to Economy,Chongqing Institute of Meteorological Sciences,Chongqing 401147,China

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

Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China

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Second Tibetan Plateau Scientific Expedition and Research Program of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGuangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesInnovative Development Special Project of China Meteorological AdministrationInnovative Development Special Project of China Meteorological Administration

2019QZKK02082022YFE01360002023YFF0805104U224220742305018421050372020B1212060025CXFZ2022J039CXFZ2023J003

2024

10.1016/j.accre.2024.01.006

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)
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