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    Poleward shift in ventilation of the North Atlantic subtropical underwater

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    Article (1.817Mb)
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    Date
    2018-01-15
    Author
    Yu, Lisan  Concept link
    Jin, Xiangze  Concept link
    Liu, Hao  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/9547
    As published
    https://doi.org/10.1002/2017GL075772
    DOI
    10.1002/2017GL075772
    Keyword
     North Atlantic salinity maximum; Subtropical underwater; Poleward expansion; Ventilation; Decadal variability 
    Abstract
    We report the findings that the sea surface salinity maximum (SSS-max) in the North Atlantic has poleward expanded in recent decades and that the expansion is a main driver of the decadal changes in subtropical underwater (STUW). We present observational evidence that the STUW ventilation zone (marked by the location of the 36.7 isohaline) has been displaced northward by1.2 ± 0.36° latitude for the 34 year (1979–2012) period. As a result of the redistribution of the SSS-max water, the ventilation zone has shifted northward and expanded westward into the Sargasso Sea. The ventilation rate of STUW has increased, which is attributed to the increased lateral induction of the sloping mixed layer. STUW has become broader, deeper, and saltier, and the changes are most pronounced on the northern and western edges of the high-saline core.
    Description
    Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 45 (2018): 258–266, doi:10.1002/2017GL075772.
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    • Physical Oceanography (PO)
    Suggested Citation
    Geophysical Research Letters 45 (2018): 258–266
     

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