The Tibetan Plateau(TP)is characterized by heavily local dust activities,however,the mechanism of interannual variations of winter dust frequency over the TP remain poorly understood.Previous studies showed the autumn Arctic sea ice could significantly influence the winter climate over Eurasia.Whether autumn sea ice affects winter dust activity over the TP or not?Here,we used an integrated surface database to investigate possible mechanisms for interannual variability in the frequency of winter dust events above the TP.This variability,which is thought to be mainly caused by local dust emissions,shows significant correlations with sea ice concentration(SIC)in the Barents and Kara Seas during the preceding autumn.Low Barents-Kara SIC is accompanied by reduced snow depth over northern Eurasia between autumn and winter,which can enhance the Eurasian mid-latitude westerly jet stream.This strengthening increases the cyclogenesis and occurrence of strong surface wind speeds in winter,especially over the TP.In addition,a lower SIC is closely associated with reduced precipitation and snow cover in late autumn and winter over the TP,which in turn enhances warming of the land surface and reduces the area of frozen ground.These anomalies in at-mospheric circulation patterns and local surface conditions promote dust events above the TP during winter.The ensemble means of Atmo-spheric Model Intercomparison Project experiments from Phase 6 of the Coupled Model Inter-comparison Project and the Community Atmosphere Model version 4 can generally reproduce the atmospheric circulation anomalies associated with decreased Barents-Kara SIC.This study reveals the crucial effect that SIC anomalies in the Barents and Kara Seas have on winter dust activities over the TP.

Climate Change Research Centre,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;CMA Earth System Modeling and Prediction Centre(CEMC),China Meteorological Administration,Beijing 100081,China;Nansen-Zhu International Research Centre,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;Key Laboratory of Meteorological Disaster(KLME),Ministry of Education&Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science&Technology,Nanjing 210044,China;College of Environment and Ecology,Chongqing University,Chongqing 400044,China;Land-Atmosphere Interaction and Its Climatic Effects Group,State Key Laboratory of Tibetan Plateau Earth System and Resources Environment(TPESRE),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;College of Earth and Planetary Sciences,University of Chinese Academy of Science,Beijing 100049,China;Center for Pan-third Pole Environment,Lanzhou University,Lanzhou 730000,China

[1]Chao XU;Jie-Hua MA;Jian-Qi SUN;Chao YOU;Yao-Ming MA;Hui-Jun WANG;Tao WANG-.Links between winter dust over the Tibetan Plateau and preceding autumn sea ice variability in the Barents and Kara Seas)[J].气候变化研究进展（英文版）,2022(06):896-908

cyclogenesis,Atmo

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