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- Title
Delayed Antarctic melt season reduces albedo feedback.
- Authors
Liang, Lei; Guo, Huadong; Liang, Shuang; Li, Xichen; Moore, John C; Li, Xinwu; Cheng, Xiao; Wu, Wenjin; Liu, Yan; Rinke, Annette; Jia, Gensuo; Pan, Feifei; Gong, Chen
- Abstract
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.
- Subjects
ANTARCTICA; ALBEDO; SNOWMELT; SOLAR radiation; EDDY flux; SEASONS; SEA ice
- Publication
National Science Review, 2023, Vol 10, Issue 9, p1
- ISSN
2095-5138
- Publication type
Article
- DOI
10.1093/nsr/nwad157