气候变化领域集成服务门户(CCPortal): Processes responsible for the southern hemisphere ocean heat uptake and redistribution under anthropogenic warming

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DOI	10.1175/JCLI-D-19-0478.1
	Processes responsible for the southern hemisphere ocean heat uptake and redistribution under anthropogenic warming
	Lyu K.; Zhang X.; Church J.A.; Wu Q.
发表日期	2020
ISSN	0894-8755
起始页码	3787
结束页码	3807
卷号	33 期号:9
英文摘要	The Southern Hemisphere oceans absorb most of the excess heat stored in the climate system due to anthropogenic warming. By analyzing future climate projections from a large ensemble of the CMIP5 models under a high emission scenario (RCP8.5), we investigate how the atmospheric forcing and ocean circulation determine heat uptake and redistribution in the Southern Hemisphere oceans. About two-thirds of the net surface heat gain in the high-latitude Southern Ocean is redistributed northward, leading to enhanced and deep-reaching warming at middle latitudes near the boundary between the subtropical gyres and the Antarctic Circumpolar Current. The projected magnitudes of the ocean warming are closely related to the magnitudes of the wind and gyre boundary poleward shifts across the models. For those models with the simulated gyre boundary biased equatorward, the latitude where the projected ocean warming peaks is also located farther equatorward and a larger poleward shift of the gyre boundary is projected. In a theoretical framework, the subsurface ocean changes are explored using three distinctive processes on the temperature–salinity diagram: pure heave, pure warming, and pure freshening. The enhanced middle-latitude warming and the deepening of isopycnals are attributed to the pure heave and pure warming processes, likely related to the wind-driven heat convergence and the accumulation of extra surface heat uptake by the background ocean circulation, respectively. The equatorward and downward subductions of the surface heat and freshwater input at high latitudes (i.e., pure warming and pure freshening processes) result in cooling and freshening spiciness changes on density surfaces within the Subantarctic Mode Water and Antarctic Intermediate Water. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy
英文关键词	Ocean currents; Antarctic Circumpolar Currents; Antarctic intermediate waters; Anthropogenic warming; Atmospheric forcing; Future climate projections; Southern Hemisphere; Subantarctic mode water; Theoretical framework; Climate models; anthropogenic effect; atmospheric forcing; climate change; climate modeling; ensemble forecasting; future prospect; heat source; intermediate water; oceanic circulation; sea surface temperature; Southern Hemisphere; warming; weather forecasting; wind field; Antarctic Circumpolar Current; Southern Ocean
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/171343
作者单位	Centre for Southern Hemisphere Oceans Research, CSIRO Oceans and Atmosphere, Hobart, TAS, Australia; Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia; State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China; National Centre for Atmospheric Science–Climate, Department of Meteorology, University of Reading, Reading, United Kingdom
推荐引用方式 GB/T 7714	Lyu K.,Zhang X.,Church J.A.,et al. Processes responsible for the southern hemisphere ocean heat uptake and redistribution under anthropogenic warming[J],2020,33(9).
APA	Lyu K.,Zhang X.,Church J.A.,&Wu Q..(2020).Processes responsible for the southern hemisphere ocean heat uptake and redistribution under anthropogenic warming.Journal of Climate,33(9).
MLA	Lyu K.,et al."Processes responsible for the southern hemisphere ocean heat uptake and redistribution under anthropogenic warming".Journal of Climate 33.9(2020).