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Ventilation of the abyss in the Atlantic sector of the Southern Ocean

Scientific reports, 2021-03, Vol.11 (1), p.6760-6760, Article 6760 [Peer Reviewed Journal]

The Author(s) 2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;The Author(s) 2021. corrected publication 2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;Distributed under a Creative Commons Attribution 4.0 International License ;The Author(s) 2021, corrected publication 2021 ;ISSN: 2045-2322 ;EISSN: 2045-2322 ;DOI: 10.1038/s41598-021-86043-2 ;PMID: 33762612

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  • Title:
    Ventilation of the abyss in the Atlantic sector of the Southern Ocean
  • Author: Akhoudas, Camille Hayatte ; Sallée, Jean-Baptiste ; Haumann, F Alexander ; Meredith, Michael P ; Garabato, Alberto Naveira ; Reverdin, Gilles ; Jullion, Loïc ; Aloisi, Giovanni ; Benetti, Marion ; Leng, Melanie J ; Arrowsmith, Carol
  • Subjects: Continental shelves ; Deep water ; Earth Sciences ; Exports ; Oceanography ; Plumes ; Sciences of the Universe ; Ventilation
  • Is Part Of: Scientific reports, 2021-03, Vol.11 (1), p.6760-6760, Article 6760
  • Description: The Atlantic sector of the Southern Ocean is the world's main production site of Antarctic Bottom Water, a water-mass that is ventilated at the ocean surface before sinking and entraining older water-masses-ultimately replenishing the abyssal global ocean. In recent decades, numerous attempts at estimating the rates of ventilation and overturning of Antarctic Bottom Water in this region have led to a strikingly broad range of results, with water transport-based calculations (8.4-9.7 Sv) yielding larger rates than tracer-based estimates (3.7-4.9 Sv). Here, we reconcile these conflicting views by integrating transport- and tracer-based estimates within a common analytical framework, in which bottom water formation processes are explicitly quantified. We show that the layer of Antarctic Bottom Water denser than 28.36 kg m[Formula: see text] [Formula: see text] is exported northward at a rate of 8.4 ± 0.7 Sv, composed of 4.5 ± 0.3 Sv of well-ventilated Dense Shelf Water, and 3.9 ± 0.5 Sv of old Circumpolar Deep Water entrained into cascading plumes. The majority, but not all, of the Dense Shelf Water (3.4 ± 0.6 Sv) is generated on the continental shelves of the Weddell Sea. Only 55% of AABW exported from the region is well ventilated and thus draws down heat and carbon into the deep ocean. Our findings unify traditionally contrasting views of Antarctic Bottom Water production in the Atlantic sector, and define a baseline, process-discerning target for its realistic representation in climate models.
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 2045-2322
    EISSN: 2045-2322
    DOI: 10.1038/s41598-021-86043-2
    PMID: 33762612
  • Source: Hyper Article en Ligne (HAL) (Open Access)
    PubMed Central
    Directory of Open Access Journals
    ProQuest Central
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