气候变化领域集成服务门户(CCPortal): Weakening of cold halocline layer exposes sea ice to oceanic heat in the eastern arctic ocean

CCPortal

DOI	10.1175/JCLI-D-19-0976.1
	Weakening of cold halocline layer exposes sea ice to oceanic heat in the eastern arctic ocean
	Polyakov I.V.; Rippeth T.P.; Fer I.; Alkire M.B.; Baumann T.M.; Carmack E.C.; Ingvaldsen R.; Ivanov V.V.; Janout M.; Lind S.; Padman L.; Pnyushkov A.V.; Rember R.
发表日期	2020
ISSN	0894-8755
起始页码	8107
结束页码	8123
卷号	33 期号:18
英文摘要	A 15-yr duration record of mooring observations from the eastern (.708E) Eurasian Basin (EB) of the Arctic Ocean is used to show and quantify the recently increased oceanic heat flux from intermediate-depth (;150–900 m) warm Atlantic Water (AW) to the surface mixed layer and sea ice. The upward release of AW heat is regulated by the stability of the overlying halocline, which we show has weakened substantially in recent years. Shoaling of the AW has also contributed, with observations in winter 2017–18 showing AW at only 80 m depth, just below the wintertime surface mixed 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, from an average of 3–4 W m22 in 2007–08 to .10 W m22 in 2016–18. This seasonal AW heat loss in the eastern EB is 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. Ó 2020 American Meteorological Society.
英文关键词	Feedback; Mooring; Sea ice; American meteorological societies; Ice albedo feedback; Intermediate depths; Oceanic heat flux; Sea ice formations; Surface mixed layers; Two-fold reduction; Winter convection; Heat flux; halocline; heat flux; mixed layer; oceanic convection; quantitative analysis; sea ice; shoaling wave; warm water; Arctic Ocean; Eurasian Basin
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171132
作者单位	International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States; College of Natural Science and Mathematics, University of Alaska Fairbanks, Fairbanks, AK, United States; Finnish Meteorological Institute, Helsinki, Finland; School of Ocean Sciences, Bangor University, Menai Bridge, United Kingdom; Geophysical Institute, University of Bergen, Bjerknes Centre for Climate Research, Bergen, Norway; Polar Science Center, Applied Physics Lab, University of Washington, Seattle, WA, United States; Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, BC, Canada; Institute of Marine Research, Bergen, Norway; Geography Department, Lomonosov Moscow State University, Moscow, Russian Federation; Arctic and Antarctic Research Institute, Ocean-air interaction department, St.Petersburg, Russian Federation; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Earth and Space Research, Corvallis, OR, United States
推荐引用方式 GB/T 7714	Polyakov I.V.,Rippeth T.P.,Fer I.,et al. Weakening of cold halocline layer exposes sea ice to oceanic heat in the eastern arctic ocean[J],2020,33(18).
APA	Polyakov I.V..,Rippeth T.P..,Fer I..,Alkire M.B..,Baumann T.M..,...&Rember R..(2020).Weakening of cold halocline layer exposes sea ice to oceanic heat in the eastern arctic ocean.Journal of Climate,33(18).
MLA	Polyakov I.V.,et al."Weakening of cold halocline layer exposes sea ice to oceanic heat in the eastern arctic ocean".Journal of Climate 33.18(2020).