Atlantic Circulation and Ice Sheet Influences on Upper South Atlantic Temperature During the Last Deglaciation

doi:10.1029/2019PA003558

	Atlantic Circulation and Ice Sheet Influences on Upper South Atlantic Temperature During the Last Deglaciation
	Umling, N. E.7,8; Oppo, D. W.8; Chen, P.6; Yu, J.6; Liu, Z.5; Yan, M.2,3,4; Gebbie, G.12; Lund, D. C.1; Pietro, K. R.8; Jin, Z. D.11
刊名	PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
	2019-06-01
卷号	34 期号:6 页码:990-1005
ISSN号	2572-4517
DOI	10.1029/2019PA003558
通讯作者	Umling, N. E.(numling@amnh.org)
英文摘要	Atlantic Meridional Overturning Circulation (AMOC) disruption during the last deglaciation is hypothesized to have caused large subsurface ocean temperature anomalies, but records from key regions are not available to test this hypothesis, and other possible drivers of warming have not been fully considered. Here, we present the first reliable evidence for subsurface warming in the South Atlantic during Heinrich Stadial 1, confirming the link between large-scale heat redistribution and AMOC. Warming extends across the Bolling-Allerod despite predicted cooling at this time, thus spanning intervals of both weak and strong AMOC indicating another forcing mechanism that may have been previously overlooked. Transient model simulations and quasi-conservative water mass tracers suggest that reduced northward upper ocean heat transport was responsible for the early deglacial (Heinrich Stadial 1) accumulation of heat at our shallower (similar to 1,100 m) site. In contrast, the results suggest that warming at our deeper site (similar to 1,900 m) site was dominated by southward advection of North Atlantic middepth heat anomalies. During the Bolling-Allerod, the demise of ice sheets resulted in oceanographic changes in the North Atlantic that reduced convective heat loss to the atmosphere, causing subsurface warming that overwhelmed the cooling expected from an AMOC reinvigoration. The data and simulations suggest that rising atmospheric CO2 did not contribute significantly to deglacial subsurface warming at our sites.
资助项目	U.S. National Science Foundation[OCE15-558341] ; Investment in Science Fund at the Woods Hole Oceanographic Institution ; Australian Research Council[FT140100993]
WOS关键词	WATER MASS GEOMETRY ; ATMOSPHERIC CO2 ; CARBON-ISOTOPE ; OCEAN CIRCULATION ; NORTH-ATLANTIC ; OVERTURNING CIRCULATION ; BENTHIC FORAMINIFERA ; INTERMEDIATE WATERS ; GLACIAL MAXIMUM ; CLIMATE
WOS研究方向	Geology ; Oceanography ; Paleontology
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000474863700007
资助机构	U.S. National Science Foundation ; Investment in Science Fund at the Woods Hole Oceanographic Institution ; Australian Research Council
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/13708]
专题	地球环境研究所_加速器质谱中心
通讯作者	Umling, N. E.
作者单位	1.Univ Connecticut, Dept Marine Sci, Storrs, CT USA 2.Jiangsu Ctr Collaborat Innovat Geog Informat Reso, Nanjing, Jiangsu, Peoples R China 3.Nanjing Normal Univ, Sch Geog Sci, Nanjing, Jiangsu, Peoples R China 4.Nanjing Normal Univ, Key Lab Virtual Geog Environm, Minist Educ, State Key Lab Geog Environm Evolut,Jiangsu Prov C, Nanjing, Jiangsu, Peoples R China 5.Ohio State Univ, Dept Geog, Columbus, OH 43210 USA 6.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia 7.Amer Museum Nat Hist, Dept Earth & Planetary Sci, New York, NY 10024 USA 8.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA 9.Acad Sinica, Inst Earth Sci, Taipei, Taiwan 10.Univ Sao Paulo, Oceanog Inst, Sao Paulo, Brazil
推荐引用方式 GB/T 7714	Umling, N. E.,Oppo, D. W.,Chen, P.,et al. Atlantic Circulation and Ice Sheet Influences on Upper South Atlantic Temperature During the Last Deglaciation[J]. PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,2019,34(6):990-1005.
APA	Umling, N. E..,Oppo, D. W..,Chen, P..,Yu, J..,Liu, Z..,...&Toledo, F. A. L..(2019).Atlantic Circulation and Ice Sheet Influences on Upper South Atlantic Temperature During the Last Deglaciation.PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,34(6),990-1005.
MLA	Umling, N. E.,et al."Atlantic Circulation and Ice Sheet Influences on Upper South Atlantic Temperature During the Last Deglaciation".PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY 34.6(2019):990-1005.