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Atlantic Circulation and Ice Sheet Influences on Upper South Atlantic Temperature During the Last Deglaciation
Umling, N. E.1,2; Oppo, D. W.1; Chen, P.3; Yu, J.3; Liu, Z.4; Yan, M.5,6,7; Gebbie, G.8; Lund, D. C.9; Pietro, K. R.1; Jin, Z. D.10; Huang, K-F1,11; Costa, K. B.12; Toledo, F. A. L.12
通讯作者Umling, N. E.(numling@amnh.org)
2019-06-01
发表期刊PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
ISSN2572-4517
卷号34期号:6页码:990-1005
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.
DOI10.1029/2019PA003558
关键词[WOS]WATER MASS GEOMETRY ; ATMOSPHERIC CO2 ; CARBON-ISOTOPE ; OCEAN CIRCULATION ; NORTH-ATLANTIC ; OVERTURNING CIRCULATION ; BENTHIC FORAMINIFERA ; INTERMEDIATE WATERS ; GLACIAL MAXIMUM ; CLIMATE
收录类别SCI ; SCI
语种英语
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研究方向Geology ; Oceanography ; Paleontology
项目资助者U.S. National Science Foundation ; Investment in Science Fund at the Woods Hole Oceanographic Institution ; Australian Research Council
WOS类目Geosciences, Multidisciplinary ; Oceanography ; Paleontology
WOS记录号WOS:000474863700007
出版者AMER GEOPHYSICAL UNION
引用统计
被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/13709
专题加速器质谱中心
通讯作者Umling, N. E.
作者单位1.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA
2.Amer Museum Nat Hist, Dept Earth & Planetary Sci, New York, NY 10024 USA
3.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia
4.Ohio State Univ, Dept Geog, Columbus, OH 43210 USA
5.Nanjing Normal Univ, Key Lab Virtual Geog Environm, Minist Educ, State Key Lab Geog Environm Evolut,Jiangsu Prov C, Nanjing, Jiangsu, Peoples R China
6.Nanjing Normal Univ, Sch Geog Sci, Nanjing, Jiangsu, Peoples R China
7.Jiangsu Ctr Collaborat Innovat Geog Informat Reso, Nanjing, Jiangsu, Peoples R China
8.Woods Hole Oceanog Inst, Dept Phys Oceanog, Woods Hole, MA 02543 USA
9.Univ Connecticut, Dept Marine Sci, Storrs, CT USA
10.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Shaanxi, Peoples R China
11.Acad Sinica, Inst Earth Sci, Taipei, Taiwan
12.Univ Sao Paulo, Oceanog Inst, Sao Paulo, Brazil
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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.
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