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

作     者：DOU Tingfeng XIE Zuowei Jason E.BOX YANG Qing YANG Yifan TENG Shiwen XU Gaojie LIU Chao LI Xichen Derek HOUTZ GONG Xun DU Zhiheng DING Minghu YU Yongqiang XIAO Cunde DOU Tingfeng;XIE Zuowei;Jason E.BOX;YANG Qing;YANG Yifan;TENG Shiwen;XU Gaojie;LIU Chao;LI Xichen;Derek HOUTZ;GONG Xun;DU Zhiheng;DING Minghu;YU Yongqiang;XIAO Cunde

作者机构：College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijing 100049China Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Geological Survey of Denmark and Greenland(GEUS)Copenhagen 1350Denmark Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdministrationSchool of Atmospheric PhysicsNanjing University of Information Science&TechnologyNanjing 210044China Swiss Federal Institute for ForestSnow and Landscape Research(WSL)Birmensdorf CH-8903Switzerland Hubei Key Laboratory of Marine Geological ResourcesChina University of GeosciencesWuhan 430074China State Key Laboratory of Cryospheric ScienceNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Institute of Global Change and Polar MeteorologyChinese Academy of Meteorological SciencesBeijing 100081China State Key Laboratory of Earth Surface Processes and Resource EcologyBeijing Normal UniversityBeijing 100875China 

出 版 物：《Advances in Polar Science》 (极地科学进展（英文版）)

年 卷 期：2023年第34卷第3期

页      面：165-176页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0705[理学-地理学] 070501[理学-自然地理学] 0706[理学-大气科学] 

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 

主　　题：Greenland Ice Sheet rainfall polar vortex liquid cloud 

摘      要：Rainfall was witnessed for the first time at the highest area of the Greenland Ice Sheet on 14 August,*** thermodynamic mechanisms supporting the rainfall are revealed by ERA5 reanalysis,in-situ and satellite *** 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 *** a wide swath of the ice sheet,atmospheric uplift maintained above-melting and rainfall conditions via condensation and enhanced downward infrared *** the low-level liquid clouds,the spatial extent and duration of the rainfall would have been *** 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,*** events may occur more frequently with the decreased temperature contrast between the Arctic and the mid-latitude regions that drives highly amplified jet ***,this extreme event serves as a harbinger of a more likely wet surface condition across all elevations of the ice sheet.