期刊
SCIENCE ADVANCES
卷 6, 期 45, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abc4699
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) [KAKENHI 26340018, 17H01870, 19H05668]
- Arctic Challenge for Sustainability II (ArCS II) project - Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [JPMXD1300000000, JPMXD1420318865]
- NASA [NNH18ZDA001N-TE, 80NSSC19K0649, 80NSSC18K0980, NNX15AT74A]
- NSF [AON-1203473, AON-1724523, AON-1947162, 1708427]
- DOE [DE-SC0020640]
- Norwegian Nansen Legacy program - Research Council of Norway (RCN) [276730]
- CarbonBridge program - Research Council of Norway (RCN) [226415]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1708427] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [17H01870] Funding Source: KAKEN
Arctic river discharge increased over the last several decades, conveying heat and freshwater into the Arctic Ocean and likely affecting regional sea ice and the ocean heat budget. However, until now, there have been only limited assessments of riverine heat impacts. Here, we adopted a synthesis of a pan-Arctic sea ice-ocean model and a land surface model to quantify impacts of river heat on the Arctic sea ice and ocean heat budget. We show that river heat contributed up to 10% of the regional sea ice reduction over the Arctic shelves from 1980 to 2015. Particularly notable, this effect occurs as earlier sea ice breakup in late spring and early summer. The increasing ice-free area in the shelf seas results in a warmer ocean in summer, enhancing ocean-atmosphere energy exchange and atmospheric warming. Our findings suggest that a positive river heat-sea ice feedback nearly doubles the river heat effect.
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