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DOI | 10.1073/pnas.1704512114 |
Asynchronous warming and delta O-18 evolution of deep Atlantic water masses during the last deglaciation | |
Zhang, Jiaxu1,2,10,11; Liu, Zhengyu1,2,3; Brady, Esther C.4; Oppo, Delia W.5; Clark, Peter U.6; Jahn, Alexandra7,8; Marcott, Shaun A.9; Lindsay, Keith4 | |
2017-10-17 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2017 |
卷号 | 114期号:42页码:11075-11080 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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 delta O-18 of benthic foraminiferal calcite (delta O-18(c)) . Here, we use an isotope-enabled ocean general circulation model with realistic geometry and forcing conditions to simulate the deglacial water mass and delta O-18 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 delta O-18(c) likely reflects early warming of the deep northern North Atlantic by similar to 1.4 degrees 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 delta O-18, and call for caution when inferring water mass changes from delta O-18(c) records while assuming uniform changes in deep temperatures. |
英文关键词 | Atlantic water masses last deglaciation oxygen isotopes deep ocean warming |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413237900038 |
WOS关键词 | NORTHEAST ATLANTIC ; GLACIAL MAXIMUM ; CARBON ISOTOPES ; YOUNGER DRYAS ; CO2 RISE ; OCEAN ; CIRCULATION ; VARIABILITY ; VENTILATION ; DELTA-C-13 |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204801 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Wisconsin Madison, Ctr Climat Res, Madison, WI 53706 USA; 2.Univ Wisconsin Madison, Dept Atmospher & Ocean Sci, Madison, WI 53706 USA; 3.Ohio State Univ, Dept Geog, Atmospher Sci Program, Columbus, OH 43210 USA; 4.Natl Ctr Atmospher Res, Climate & Global Dynam Div, POB 3000, Boulder, CO 80307 USA; 5.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA; 6.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA; 7.Univ Colorado Boulder, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA; 8.Univ Colorado Boulder, Inst Arctic & Alpine Res, Boulder, CO 80309 USA; 9.Univ Wisconsin Madison, Dept Geosci, Madison, WI 53706 USA; 10.Los Alamos Natl Lab, Computat Phys & Methods CCS 2, Los Alamos, NM 87545 USA; 11.Los Alamos Natl Lab, Ctr Nonlinear Studies CNLS, Los Alamos, NM 87545 USA |
推荐引用方式 GB/T 7714 | Zhang, Jiaxu,Liu, Zhengyu,Brady, Esther C.,et al. Asynchronous warming and delta O-18 evolution of deep Atlantic water masses during the last deglaciation[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(42):11075-11080. |
APA | Zhang, Jiaxu.,Liu, Zhengyu.,Brady, Esther C..,Oppo, Delia W..,Clark, Peter U..,...&Lindsay, Keith.(2017).Asynchronous warming and delta O-18 evolution of deep Atlantic water masses during the last deglaciation.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(42),11075-11080. |
MLA | Zhang, Jiaxu,et al."Asynchronous warming and delta O-18 evolution of deep Atlantic water masses during the last deglaciation".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.42(2017):11075-11080. |
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