Delayed Antarctic melt season reduces albedo feedback  

作　　者：Lei Liang Huadong Guo Shuang Liang Xichen Li John C.Moore Xinwu Li Xiao Cheng Wenjin Wu Yan Liu Annette Rinke Gensuo Jia Feifei Pan Chen Gong 

机构地区：[1]Key Laboratory of Digital Earth Science,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China [2]International Research Center of Big Data for Sustainable Development Goals,Beijing 100094,China [3]Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [4]College of Global Change and Earth System Science,Beijing Normal University,Beijing 100875,China [5]Arctic Centre,University of Lapland,Rovaniemi 96101,Finland [6]CAS Center for Excellence in Tibetan Plateau Earth Sciences,Beijing 100101,China [7]School of Geospatial Engineering and Science,Sun Yat-sen University,Guangzhou 519082,China [8]Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research,Potsdam 14473,Germany [9]Department of Geography,University of North Texas,Denton,TX 76203,USA

出　　处：《National Science Review》2023年第9期230-240,共11页国家科学评论（英文版）

基　　金：supported by the Strategic Priority Research Pro-gram of the Chinese Academy of Sciences(XDA19070202);the Innovative Research Program of the International Re-search Center of Big Data for Sustainable Development Goals(CBAS2022IRP03);the International Partnership Program of Chinese Academy of Sciences(183611KYSB20200059);the National Natural Science Foundation of China(42276252).

摘　　要：Antarctica’s response to climate change varies greatly both spatially and temporally.Surface melting impacts mass balance and also lowers surface albedo.We use a 43-year record(from 1978 to 2020)of Antarctic snow melt seasons from space-borne microwave radiometers with a machine-learning algorithm to show that both the onset and the end of the melt season are being delayed.Granger-causality analysis shows that melt end is delayed due to increased heat flux from the ocean to the atmosphere at minimum sea-ice extent from warming oceans.Melt onset is Granger-caused primarily by the turbulent heat flux from ocean to atmosphere that is in turn driven by sea-ice variability.Delayed snowmelt season leads to a net decrease in the absorption of solar irradiance,as a delayed summer means that higher albedo occurs after the period of maximum solar radiation,which changes Antarctica’s radiation balance more than sea-ice cover.

关 键 词：Antarctic ice sheet SNOWMELT season delay sea ice solar irradiance 

分 类 号：TP181[自动化与计算机技术—控制理论与控制工程] P941.61[自动化与计算机技术—控制科学与工程] P467[天文地球—自然地理学]