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Title: Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic

Abstract

Here, the Antarctic Intermediate Water (AAIW) plays important roles in the global climate system and the global ocean nutrient and carbon cycles. However, it is unclear how AAIW responds to global climate changes. In particular, neodymium isotopic composition (ε Nd) reconstructions from different locations from the tropical Atlantic have led to a debate on the relationship between northward penetration of AAIW into the tropical Atlantic and the Atlantic meridional overturning circulation (AMOC) variability during the last deglaciation. We resolve this controversy by studying the transient oceanic evolution during the last deglaciation using a neodymium–enabled ocean model. Our results suggest a coherent response of AAIW and AMOC: when AMOC weakens, the northward penetration and transport of AAIW decrease while its depth and thickness increase. Our study highlights that as part of the return flow of the North Atlantic Deep Water, the northward penetration of AAIW in the Atlantic is determined predominately by AMOC intensity. Moreover, the inconsistency among different tropical Atlantic ε Nd reconstructions is reconciled by considering their corresponding core locations and depths, which were influenced by different water masses in the past. The very radiogenic water from the bottom of the Gulf of Mexico and the Caribbean Sea, whichmore » was previously overlooked in the interpretations of deglacial ε Nd variability, can be transported to shallow layers during active AMOC and modulates ε Nd in the tropical Atlantic. Changes in the AAIW core depth must also be considered. Thus, interpretation of ε Nd reconstructions from the tropical Atlantic is more complicated than suggested in previous studies.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [6]
  1. Univ. of Wisconsin-Madison, Madison, WI (United States)
  2. Univ. of Wisconsin-Madison, Madison, WI (United States); The Ohio State Univ., Columbus, OH (United States)
  3. Univ. of Wisconsin-Madison, Madison, WI (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Bern, Bern (Switzerland)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Woods Hole Oceanographic Institution, Woods Hole, MA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1481977
Alternate Identifier(s):
OSTI ID: 1402547
Report Number(s):
LA-UR-18-20281
Journal ID: ISSN 0883-8305
Grant/Contract Number:  
AC52-06NA25396; SC0006744
Resource Type:
Accepted Manuscript
Journal Name:
Paleoceanography
Additional Journal Information:
Journal Volume: 32; Journal Issue: 10; Journal ID: ISSN 0883-8305
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Earth Sciences; AAIW; AMOC; deglacial; neodymium isotope; paleocirculation tracer

Citation Formats

Gu, Sifan, Liu, Zhengyu, Zhang, Jiaxu, Rempfer, Johannes, Joos, Fortunat, and Oppo, Delia W. Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic. United States: N. p., 2017. Web. doi:10.1002/2017PA003092.
Gu, Sifan, Liu, Zhengyu, Zhang, Jiaxu, Rempfer, Johannes, Joos, Fortunat, & Oppo, Delia W. Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic. United States. doi:10.1002/2017PA003092.
Gu, Sifan, Liu, Zhengyu, Zhang, Jiaxu, Rempfer, Johannes, Joos, Fortunat, and Oppo, Delia W. Fri . "Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic". United States. doi:10.1002/2017PA003092. https://www.osti.gov/servlets/purl/1481977.
@article{osti_1481977,
title = {Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic},
author = {Gu, Sifan and Liu, Zhengyu and Zhang, Jiaxu and Rempfer, Johannes and Joos, Fortunat and Oppo, Delia W.},
abstractNote = {Here, the Antarctic Intermediate Water (AAIW) plays important roles in the global climate system and the global ocean nutrient and carbon cycles. However, it is unclear how AAIW responds to global climate changes. In particular, neodymium isotopic composition (εNd) reconstructions from different locations from the tropical Atlantic have led to a debate on the relationship between northward penetration of AAIW into the tropical Atlantic and the Atlantic meridional overturning circulation (AMOC) variability during the last deglaciation. We resolve this controversy by studying the transient oceanic evolution during the last deglaciation using a neodymium–enabled ocean model. Our results suggest a coherent response of AAIW and AMOC: when AMOC weakens, the northward penetration and transport of AAIW decrease while its depth and thickness increase. Our study highlights that as part of the return flow of the North Atlantic Deep Water, the northward penetration of AAIW in the Atlantic is determined predominately by AMOC intensity. Moreover, the inconsistency among different tropical Atlantic εNd reconstructions is reconciled by considering their corresponding core locations and depths, which were influenced by different water masses in the past. The very radiogenic water from the bottom of the Gulf of Mexico and the Caribbean Sea, which was previously overlooked in the interpretations of deglacial εNd variability, can be transported to shallow layers during active AMOC and modulates εNd in the tropical Atlantic. Changes in the AAIW core depth must also be considered. Thus, interpretation of εNd reconstructions from the tropical Atlantic is more complicated than suggested in previous studies.},
doi = {10.1002/2017PA003092},
journal = {Paleoceanography},
number = 10,
volume = 32,
place = {United States},
year = {2017},
month = {9}
}

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    Works referencing / citing this record:

    Deglacial Heat Uptake by the Southern Ocean and Rapid Northward Redistribution Via Antarctic Intermediate Water
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    • Poggemann, D. ‐W.; Nürnberg, D.; Hathorne, E. C.
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