气候变化领域集成服务门户(CCPortal): Assessing the potential capability of reconstructing glacial Atlantic water masses and AMOC using multiple proxies in CESM

CCPortal

DOI	10.1016/j.epsl.2020.116294
	Assessing the potential capability of reconstructing glacial Atlantic water masses and AMOC using multiple proxies in CESM
	Gu S.; Liu Z.; Oppo D.W.; Lynch-Stieglitz J.; Jahn A.; Zhang J.; Wu L.
发表日期	2020
ISSN	0012821X
卷号	541
英文摘要	Reconstructing the Atlantic Meridional Overturning Circulation (AMOC) during the Last Glacial Maximum (LGM) is essential for understanding glacial-interglacial climate change and the carbon cycle. However, despite many previous studies, uncertainties remain regarding the glacial water mass distributions in the Atlantic and the AMOC intensity. Here we use an isotope enabled ocean model with multiple geotracers (δ13C, εNd, 231Pa/230Th, δ18O and Δ14C) and idealized water tracers to study the potential constraints on LGM ocean circulation from multiple proxies. Our model suggests that the glacial Atlantic water mass distribution can be accurately constrained by the air-sea gas exchange signature of water masses (δ13CAS), but εNd might overestimate the North Atlantic Deep Water (NADW) percentage in the deep Atlantic probably because of the boundary source of Nd. A sensitivity experiment with an AMOC of similar geometry but much weaker strength suggests that the correct AMOC geometry is more important than the AMOC strength for simulating the observed glacial δ13C and εNd distributions. The kinematic tracer 231Pa/230Th is sensitive to AMOC intensity, but the interpretation might be complicated by the AMOC geometry and AABW transport changes during the LGM. δ18O in the benthic foraminifera (δ18Oc) from the Florida Straits provides a consistent measure of the upper ocean boundary current in the model, which potentially provides an unambiguous method to reconstruct glacial AMOC intensity. Finally, we propose that the moderate difference between AMOC intensity at LGM and PD, if any, is caused by the competition of the responses to CO2 forcing and continental ice sheet forcing. © 2020 The Author(s)
关键词	AMOC Last Glacial Maximum multi-proxy water mass
英文关键词	Climate change; Geometry; Glacial geology; Mooring; Tracers; Atlantic meridional overturning circulations; Benthic foraminifera; Continental ice sheet; Interglacial climate; North Atlantic Deep Water; Potential capability; Potential constraints; Water mass distributions; Oceanography; air-sea interaction; benthic foraminifera; deep water; isotopic analysis; Last Glacial Maximum; meridional circulation; overturn; paleoclimate; proxy climate record; reconstruction; sensitivity analysis; water mass; Straits of Florida; Foraminifera
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202621
作者单位	Physical Oceanography Laboratory, Ocean University of China, Qingdao, China; Open Studio for Ocean-Climate-Isotope Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, China; Atmospheric Science Program, Department of Geography, The Ohio State University, Columbus, OH, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Department for Atmospheric and Oceanic Sciences, Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; Computational Physics and Methods (CCS-2), Center for Nonlinear Studies (CNLS), Los Alamos National Laboratory, Los Alamos, NM, United States; Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, China
推荐引用方式 GB/T 7714	Gu S.,Liu Z.,Oppo D.W.,et al. Assessing the potential capability of reconstructing glacial Atlantic water masses and AMOC using multiple proxies in CESM[J],2020,541.
APA	Gu S..,Liu Z..,Oppo D.W..,Lynch-Stieglitz J..,Jahn A..,...&Wu L..(2020).Assessing the potential capability of reconstructing glacial Atlantic water masses and AMOC using multiple proxies in CESM.Earth and Planetary Science Letters,541.
MLA	Gu S.,et al."Assessing the potential capability of reconstructing glacial Atlantic water masses and AMOC using multiple proxies in CESM".Earth and Planetary Science Letters 541(2020).