期刊
JOURNAL OF CLIMATE
卷 33, 期 18, 页码 8107-8123出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/JCLI-D-19-0976.1
关键词
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资金
- NSF [AON-1203473, AON1947162, 1708427, 1708424]
- PEANUTS part of the Changing Arctic Ocean programme - UKRI Natural Environment Research Council (NERC) [NE/R01275X/1, 03F0804A]
- PEANUTS part of the Changing Arctic Ocean programme - German Federal Ministry of Education and Research (BMBF) [NE/R01275X/1, 03F0804A]
- Research Council of Norway [294396]
- Ministry of Science and Higher Education of the Russian Federation [RFMEFI61619X0108]
- Arctic SIZE
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1708427] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1708424] Funding Source: National Science Foundation
- NERC [NE/R01275X/1] Funding Source: UKRI
A 15-yr duration record of mooring observations from the eastern (>70 degrees E) Eurasian Basin (EB) of the Arctic Ocean is used to show and quantify the recently increased oceanic heat flux from intermediate-depth (similar to 150-900m) warmAtlantic Water (AW) to the surfacemixed layer and sea ice. The upward release ofAWheat is regulated by the stability of the overlying halocline, which we show has weakened substantially in recent years. Shoaling of theAWhas also contributed, with observations in winter 2017-18 showing AWat only 80m depth, just below the wintertime surfacemixed layer, the shallowest in our mooring records. The weakening of the halocline for several months at this time implies that AW heat was linked to winter convection associated with brine rejection during sea ice formation. This resulted in a substantial increase of upward oceanic heat flux during the winter season, froman average of 3-4W m(-2) in 2007-08 to.10Wm(-2) in 2016-18. This seasonalAWheat loss in the easternEBis equivalent to a more than a twofold reduction of winter ice growth. These changes imply a positive feedback as reduced sea ice cover permits increased mixing, augmenting the summer-dominated ice-albedo feedback.
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