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Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2

文献类型：期刊论文

作者Weiffenbach, Julia E.1; Baatsen, Michiel L. J.1; Dijkstra, Henk A.1,2; von der Heydt, Anna S.2; Abe-Ouchi, Ayako3; Brady, Esther C.4; Chan, Wing-Le3; Chandan, Deepak5; Chandler, Mark A.6; Contoux, Camille7
刊名CLIMATE OF THE PAST
出版日期2023-01-09
卷号19期号:1页码:61-85
ISSN号1814-9324
DOI10.5194/cp-19-61-2023
英文摘要The mid-Pliocene warm period (3.264-3.025 Ma) is the most recent geological period in which the atmospheric CO2 concentration was approximately equal to the concentration we measure today (ca. 400 ppm). Sea surface temperature (SST) proxies indicate above-average warming over the North Atlantic in the mid-Pliocene with respect to the pre-industrial period, which may be linked to an intensified Atlantic Meridional Overturning Circulation (AMOC). Earlier results from the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2) show that the ensemble simulates a stronger AMOC in the mid-Pliocene than in the pre-industrial. However, no consistent relationship between the stronger mid-Pliocene AMOC and either the Atlantic northward ocean heat transport (OHT) or average North Atlantic SSTs has been found. In this study, we look further into the drivers and consequences of a stronger AMOC in mid-Pliocene compared to pre-industrial simulations in PlioMIP2. We find that all model simulations with a closed Bering Strait and Canadian Archipelago show reduced freshwater transport from the Arctic Ocean into the North Atlantic. This contributes to an increase in salinity in the subpolar North Atlantic and Labrador Sea that can be linked to the stronger AMOC in the mid-Pliocene. To investigate the dynamics behind the ensemble's variable response of the total Atlantic OHT to the stronger AMOC, we separate the Atlantic OHT into two components associated with either the overturning circulation or the wind-driven gyre circulation. While the ensemble mean of the overturning component is increased significantly in magnitude in the mid-Pliocene, it is partly compensated by a reduction in the gyre component in the northern subtropical gyre region. This indicates that the lack of relationship between the total OHT and AMOC is due to changes in OHT by the subtropical gyre. The overturning and gyre components should therefore be considered separately to gain a more complete understanding of the OHT response to a stronger mid-Pliocene AMOC. In addition, we show that the AMOC exerts a stronger influence on North Atlantic SSTs in the mid-Pliocene than in the pre-industrial, providing a possible explanation for the improved agreement of the PlioMIP2 ensemble mean SSTs with reconstructions in the North Atlantic.
WOS关键词EARTH SYSTEM MODEL ; HEAT-TRANSPORT ; FRESH-WATER ; SEA-ICE ; THERMOHALINE CIRCULATION ; GLOBAL CLIMATE ; OCEAN ; GREENHOUSE ; SIMULATIONS ; SENSITIVITY
资助项目Netherlands Earth System Science Centre (OCW grant)[024.002.001]
WOS研究方向Geology ; Meteorology & Atmospheric Sciences
语种英语
出版者COPERNICUS GESELLSCHAFT MBH
WOS记录号WOS:000911191300001
资助机构Netherlands Earth System Science Centre (OCW grant) ; Netherlands Earth System Science Centre (OCW grant) ; Netherlands Earth System Science Centre (OCW grant) ; Netherlands Earth System Science Centre (OCW grant) ; Netherlands Earth System Science Centre (OCW grant) ; Netherlands Earth System Science Centre (OCW grant) ; Netherlands Earth System Science Centre (OCW grant) ; Netherlands Earth System Science Centre (OCW grant)
源URL[http://ir.iggcas.ac.cn/handle/132A11/106901]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Weiffenbach, Julia E.
作者单位1.Univ Utrecht, Inst Marine & Atmospher Res Utrecht IMAU, Dept Phys, NL-3584 CC Utrecht, Netherlands
2.Univ Utrecht, Ctr Complex Syst Sci, NL-3584 CE Utrecht, Netherlands
3.Univ Tokyo, Atmosphere & Ocean Res Inst, Kashiwa 2778564, Japan
4.Natl Ctr Atmospher Res NCAR, Climate & Global Dynam Lab, Boulder, CO 80305 USA
5.Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada
6.Columbia Univ, CCSR, GISS, New York, NY 10025 USA
7.Univ Paris Saclay, Lab Sci Climat & Environm, LSCE, IPSL,CEA,CNRS.UVSQ, F-91191 Gif Sur Yvette, France
8.Univ Connecticut, Coll Liberal Arts & Sci, Dept Geosci, Storrs, CT 06033 USA
9.NORCE Norwegian Res Ctr, Bjerknes Ctr Climate Res, N-5007 Bergen, Norway
10.Hohai Univ, Coll Oceanog, Nanjing, Peoples R China
推荐引用方式
GB/T 7714		 Weiffenbach, Julia E.,Baatsen, Michiel L. J.,Dijkstra, Henk A.,et al. Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2[J]. CLIMATE OF THE PAST,2023,19(1):61-85.
APA Weiffenbach, Julia E..,Baatsen, Michiel L. J..,Dijkstra, Henk A..,von der Heydt, Anna S..,Abe-Ouchi, Ayako.,...&Zhang, Zhongshi.(2023).Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2.CLIMATE OF THE PAST,19(1),61-85.
MLA Weiffenbach, Julia E.,et al."Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2".CLIMATE OF THE PAST 19.1(2023):61-85.

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