Competing climate feedbacks of ice sheet freshwater discharge in a warming world

被引：3
|
作者：
Li, Dawei [1 ,2 ,3 ,4 ]
Deconto, Robert M. [5 ]
Pollard, David [5 ,6 ]
Hu, Yongyun [7 ]
机构：
[1] Shanghai Jiao Tong Univ, Key Lab Polar Ecosyst & Climate Change, Minist Educ, Shanghai 200030, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Oceanog, Shanghai 200030, Peoples R China
[3] Shanghai Jiao Tong Univ, Shanghai Frontiers Sci Ctr Polar Sci, Shanghai 200030, Peoples R China
[4] Minist Nat Resources, Polar Res Inst China, Key Lab Polar Sci, Shanghai 200136, Peoples R China
[5] Univ Massachusetts, Dept Earth Geog & Climate Sci, Amherst, MA 01003 USA
[6] Penn State Univ, Earth & Environm Syst Inst, University Pk, PA 16802 USA
[7] Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, Beijing 100871, Peoples R China
来源：
NATURE COMMUNICATIONS | 2024年 / 15卷 / 01期
基金：
上海市自然科学基金; 中国国家自然科学基金; 美国国家科学基金会;
关键词：
NORTHERN-HEMISPHERE; SEA-ICE; MODEL; OCEAN; ANTARCTICA; DRIVEN; DEGLACIATION; CIRCULATION; SIMULATION; MELTWATER;
D O I：
10.1038/s41467-024-49604-3
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Freshwater discharge from ice sheets induces surface atmospheric cooling and subsurface ocean warming, which are associated with negative and positive feedbacks respectively. However, uncertainties persist regarding these feedbacks' relative strength and combined effect. Here we assess associated feedbacks in a coupled ice sheet-climate model, and show that for the Antarctic Ice Sheet the positive feedback dominates in moderate future warming scenarios and in the early stage of ice sheet retreat, but is overwhelmed by the negative feedback in intensive warming scenarios when the West Antarctic Ice Sheet undergoes catastrophic collapse. The Atlantic Meridional Overturning Circulation is affected by freshwater discharge from both the Greenland and the Antarctic ice sheets and, as an interhemispheric teleconnection bridge, exacerbates the opposing ice sheet's retreat via the Bipolar Seesaw. These results highlight the crucial role of ice sheet-climate interactions via freshwater flux in future ice sheet retreat and associated sea-level rise. Ice sheet freshwater discharge interacts with the climate and affects the ice sheet's sensitivity to climate change. This study shows that the overall feedback shifts from positive to negative as the pace of future warming intensifies
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收藏
页数：12
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