Delayed Antarctic melt season reduces albedo feedback

作者：Lei Liang, Huadong Guo, Shuang Liang, Xichen Li, Xichen Li, John C. Moore, Xinwu Li, Xinwu Li, Xiao Cheng, Wenjin Wu, Yan Liu, Annette Rinke, Gensuo Jia, Feifei Pan, Chen Gong · 发表于：National Science Review · 年份：2023 · DOI：10.1093/nsr/nwad157 · 被引用次数：8 · 研究领域：Cryospheric studies and observations、Atmospheric and Environmental Gas Dynamics、Climate variability and models

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.