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    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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    Date
    2017-10-24
    Author
    Gu, Sifan  Concept link
    Liu, Zhengyu  Concept link
    Zhang, Jiaxu  Concept link
    Rempfer, Johannes  Concept link
    Joos, Fortunat  Concept link
    Oppo, Delia W.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/9397
    As published
    https://doi.org/10.1002/2017PA003092
    DOI
    10.1002/2017PA003092
    Keyword
     AAIW; AMOC; Deglacial; Neodymium isotope; Paleocirculation tracer 
    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 (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.
    Description
    Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 32 (2017): 1036–1053, doi:10.1002/2017PA003092.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Paleoceanography 32 (2017): 1036–1053
     

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