Analysis of the record-breaking August 2021 rainfall over the Greenland Ice Sheet

查看全文 作　　者：DOU [1]Tingfeng;XIE [2]Zuowei;Jason [3]E.BOX;YANG [2]Qing;YANG [1]Yifan;TENG [4]Shiwen;XU [1]Gaojie;LIU [4]Chao;LI [2]Xichen;Derek [5]HOUTZ;GONG [6]Xun;DU [7]Zhiheng;DING [8]Minghu;YU [2]Yongqiang;XIAO [9]Cunde

机构地区：[1]College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China;[2]Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;[3]Geological Survey of Denmark and Greenland(GEUS),Copenhagen 1350,Denmark;[4]Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,School of Atmospheric Physics,Nanjing University of Information Science&Technology,Nanjing 210044,China;[5]Swiss Federal Institute for Forest,Snow and Landscape Research(WSL),Birmensdorf CH-8903,Switzerland;[6]Hubei Key Laboratory of Marine Geological Resources,China University of Geosciences,Wuhan 430074,China;[7]State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;[8]Institute of Global Change and Polar Meteorology,Chinese Academy of Meteorological Sciences,Beijing 100081,China;[9]State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875,China

出　　处：《Advances in Polar Science》索引2023年第34卷第3期,共12页

基　　金：supported by the National Key Research&Development Program of China (Grant no.2018YFC1406104);conducted by Geological Survey of Denmark and Greenland (GEUS)under support from the Danish Ministry of Climate,Energy and Utilities via The Programme for Monitoring of the Greenland Ice Sheet (PROMICE);the INTAROS project under the European Union's Horizon 2020 Research and Innovation Program under grant agreement no.727890。 摘　　要：Rainfall was witnessed for the first time at the highest area of the Greenland Ice Sheet on 14 August,2021.The thermodynamic mechanisms supporting the rainfall are revealed by ERA5 reanalysis,in-situ and satellite data.We find that a strong southward intrusion of the polar vortex favored the maintenance of a deep cyclone over Baffin Island and an amplification of anticyclonic circulation over the southeastern ice sheet,which pumped warm and moist air toward Greenland from anomalously warm waters south of Greenland.Across a wide swath of the ice sheet,atmospheric uplift maintained above-melting and rainfall conditions via condensation and enhanced downward infrared irradiance.Without the low-level liquid clouds,the spatial extent and duration of the rainfall would have been smaller.Over the ice sheet topographic summit,the air temperature from the ground to 250 hPa level was~2℃higher than the previous record set on 12 July,2012.Such events may occur more frequently with the decreased temperature contrast between the Arctic and the mid-latitude regions that drives highly amplified jet streams.Thus,this extreme event serves as a harbinger of a more likely wet surface condition across all elevations of the ice sheet. 关键词：Greenland Ice Sheet RAINFALL polar vortex liquid cloud

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Analysis of the record-breaking August 2021 rainfall over the Greenland Ice Sheet

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