气候变化领域集成服务门户(CCPortal): Multidecadal warming and density loss in the Deep Weddell Sea; Antarctica

CCPortal

DOI	10.1175/JCLI-D-20-0271.1
	Multidecadal warming and density loss in the Deep Weddell Sea; Antarctica
	Strass V.H.; Rohardt G.; Kanzow T.; Hoppema M.; Boebel O.
发表日期	2020
ISSN	0894-8755
起始页码	9863
结束页码	9881
卷号	33 期号:22
英文摘要	The World Ocean is estimated to store more than 90% of the excess energy resulting from man-made greenhouse gas–driven radiative forcing as heat. Uncertainties of this estimate are related to undersampling of the subpolar and polar regions and of the depths below 2000 m. Here we present measurements from the Weddell Sea that cover the whole water column down to the sea floor, taken by the same accurate method at locations revisited every few years since 1989. Our results show widespread warming with similar long-term temperature trends below 700-m depth at all sampling sites. The mean heating rate below 2000 m exceeds that of the global ocean by a factor of about 5. Salinity tends to increase—in contrast to other Southern Ocean regions—at most sites and depths below 700 m, but nowhere strongly enough to fully compensate for the warming effect on seawater density, which hence shows a general decrease. In the top 700 m neither temperature nor salinity shows clear trends. A closer look at the vertical distribution of changes along an approximately zonal and a meridional section across the Weddell Gyre reveals that the strongest vertically coherent warming is observed at the flanks of the gyre over the deep continental slopes and at its northern edge where the gyre connects to the Antarctic Circumpolar Current (ACC). Most likely, the warming of the interior Weddell Sea is driven by changes of the Weddell Gyre strength and its interaction with the ACC. © 2020 American Meteorological Society
英文关键词	Atmospheric radiation; Greenhouse gases; Ocean currents; Seawater effects; Antarctic circumpolar current; Continental slope; Radiative forcings; Sampling site; Southern ocean; Temperature trends; Under-sampling; Vertical distributions; Uncertainty analysis; accuracy assessment; circumpolar current; climate change; continental slope; decadal variation; global warming; greenhouse gas; oceanic circulation; polar region; radiative forcing; uncertainty analysis; warming; water column; Antarctica; Southern Ocean; Southern Ocean; Weddell Sea
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/171041
作者单位	Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
推荐引用方式 GB/T 7714	Strass V.H.,Rohardt G.,Kanzow T.,et al. Multidecadal warming and density loss in the Deep Weddell Sea; Antarctica[J],2020,33(22).
APA	Strass V.H.,Rohardt G.,Kanzow T.,Hoppema M.,&Boebel O..(2020).Multidecadal warming and density loss in the Deep Weddell Sea; Antarctica.Journal of Climate,33(22).
MLA	Strass V.H.,et al."Multidecadal warming and density loss in the Deep Weddell Sea; Antarctica".Journal of Climate 33.22(2020).