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

Gu, Sifan; Liu, Zhengyu; Zhang, Jiaxu; Rempfer, Johannes; Joos, Fortunat; Oppo, Delia W.

doi:10.1002/2017PA003092

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

Journal Article · Fri Sep 22 00:00:00 EDT 2017 · Paleoceanography

DOI:https://doi.org/10.1002/2017PA003092· OSTI ID:1481977

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Univ. of Wisconsin-Madison, Madison, WI (United States)
Univ. of Wisconsin-Madison, Madison, WI (United States); The Ohio State Univ., Columbus, OH (United States)
Univ. of Wisconsin-Madison, Madison, WI (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Bern, Bern (Switzerland)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Woods Hole Oceanographic Institution, Woods Hole, MA (United States)

Abstract 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, which 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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-06NA25396; DE‐SC0006744

OSTI ID:: 1481977

Alternate ID(s):: OSTI ID: 1402547

Report Number(s):: LA-UR-18-20281

Journal Information:: Paleoceanography, Vol. 32, Issue 10; ISSN 0883-8305

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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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

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