globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1704512114
论文题名:
Asynchronous warming and δ18O evolution of deep Atlantic water masses during the last deglaciation
作者: Zhang J.; Liu Z.; Brady E.C.; Oppo D.W.; Clark P.U.; Jahn A.; Marcott S.A.; Lindsay K.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2017
卷: 114, 期:42
起始页码: 11075
结束页码: 11080
语种: 英语
英文关键词: Atlantic water masses ; Deep ocean warming ; Last deglaciation ; Oxygen isotopes
Scopus关键词: oxygen 18 ; advection ; Article ; Atlantic Ocean ; deglaciation ; greenhouse effect ; mass ; North Atlantic deep water ; oxygen evolution ; priority journal ; thermodynamics ; water temperature
英文摘要: The large-scale reorganization of deep ocean circulation in the Atlantic involving changes in North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW) played a critical role in regulating hemispheric and global climate during the last deglaciation. However, changes in the relative contributions of NADW and AABW and their properties are poorly constrained by marine records, including δ18O of benthic foraminiferal calcite (δ18Oc). Here, we use an isotope-enabled ocean general circulation model with realistic geometry and forcing conditions to simulate the deglacial water mass and δ18O evolution. Model results suggest that, in response to North Atlantic freshwater forcing during the early phase of the last deglaciation, NADW nearly collapses, while AABW mildly weakens. Rather than reflecting changes in NADW or AABW properties caused by freshwater input as suggested previously, the observed phasing difference of deep δ18Oc likely reflects early warming of the deep northern North Atlantic by ∼1.4 °C, while deep Southern Ocean temperature remains largely unchanged. We propose a thermodynamic mechanism to explain the early warming in the North Atlantic, featuring a strong middepth warming and enhanced downward heat flux via vertical mixing. Our results emphasize that the way that ocean circulation affects heat, a dynamic tracer, is considerably different from how it affects passive tracers, like δ18O, and call for caution when inferring water mass changes from δ18Oc records while assuming uniform changes in deep temperatures. © 2017, National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163786
Appears in Collections:气候变化与战略

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作者单位: Zhang, J., Center for Climatic Research, University of Wisconsin–Madison, Madison, WI 53706, United States, Department of Atmospheric and Oceanic Sciences, University of Wisconsin–Madison, Madison, WI 53706, United States, Computational Physics and Methods (CCS-2), Center for Nonlinear Studies (CNLS), Los Alamos National Laboratory, Los Alamos, NM 87545, United States; Liu, Z., Center for Climatic Research, University of Wisconsin–Madison, Madison, WI 53706, United States, Department of Atmospheric and Oceanic Sciences, University of Wisconsin–Madison, Madison, WI 53706, United States, Atmospheric Science Program, Department of Geography, Ohio State University, Columbus, OH 43210, United States; Brady, E.C., Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO 80307, United States; Oppo, D.W., Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Clark, P.U., College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, United States; Jahn, A., Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO 80309, United States, Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, United States; Marcott, S.A., Department of Geoscience, University of Wisconsin–Madison, Madison, WI 53706, United States; Lindsay, K., Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO 80307, United States

Recommended Citation:
Zhang J.,Liu Z.,Brady E.C.,et al. Asynchronous warming and δ18O evolution of deep Atlantic water masses during the last deglaciation[J]. Proceedings of the National Academy of Sciences of the United States of America,2017-01-01,114(42)
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