Journal
SCIENCE
Volume 356, Issue 6335, Pages 285-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aai8204
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Funding
- NSF [1203473, 1249133]
- National Oceanic and Atmospheric Administration [NA15OAR4310155]
- Russian Science Foundation [14-37-00053]
- A-TWAIN
- Arctic Ocean program at the FRAM-High North Research Centre for Climate and the Environment
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1203146] Funding Source: National Science Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1249133, 1203473] Funding Source: National Science Foundation
- Russian Science Foundation [17-37-00006] Funding Source: Russian Science Foundation
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Arctic sea-ice loss is a leading indicator of climate change and can be attributed, in large part, to atmospheric forcing. Here, we show that recent ice reductions, weakening of the halocline, and shoaling of the intermediate-depth Atlantic Water layer in the eastern Eurasian Basin have increased winter ventilation in the ocean interior, making this region structurally similar to that of the western Eurasian Basin. The associated enhanced release of oceanic heat has reduced winter sea-ice formation at a rate now comparable to losses from atmospheric thermodynamic forcing, thus explaining the recent reduction in sea-ice cover in the eastern Eurasian Basin. This encroaching atlantification of the Eurasian Basin represents an essential step toward a new Arctic climate state, with a substantially greater role for Atlantic inflows.
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