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    Unabated bottom water warming and freshening in the south Pacific Ocean.

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    Article (3.308Mb)
    Date
    2019-02-20
    Author
    Purkey, Sarah G.  Concept link
    Johnson, Gregory C.  Concept link
    Talley, Lynne D.  Concept link
    Sloyan, Bernadette M.  Concept link
    Wijffels, Susan E.  Concept link
    Smethie, William M.  Concept link
    Mecking, Sabine  Concept link
    Katsumata, Katsuro  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/24113
    As published
    http://doi.org/10.1029/2018JC014775
    DOI
    10.1029/2018JC014775
    Keyword
     abyssal warming; Pacific deep circulation; deep steric sea level; deep warming variability; Antarctic Bottom Water 
    Abstract
    Abyssal ocean warming contributed substantially to anthropogenic ocean heat uptake and global sea level rise between 1990 and 2010. In the 2010s, several hydrographic sections crossing the South Pacific Ocean were occupied for a third or fourth time since the 1990s, allowing for an assessment of the decadal variability in the local abyssal ocean properties among the 1990s, 2000s, and 2010s. These observations from three decades reveal steady to accelerated bottom water warming since the 1990s. Strong abyssal (z > 4,000 m) warming of 3.5 (±1.4) m°C/year (m°C = 10−3 °C) is observed in the Ross Sea, directly downstream from bottom water formation sites, with warming rates of 2.5 (±0.4) m°C/year to the east in the Amundsen‐Bellingshausen Basin and 1.3 (±0.2) m°C/year to the north in the Southwest Pacific Basin, all associated with a bottom‐intensified descent of the deepest isotherms. Warming is consistently found across all sections and their occupations within each basin, demonstrating that the abyssal warming is monotonic, basin‐wide, and multidecadal. In addition, bottom water freshening was strongest in the Ross Sea, with smaller amplitude in the Amundsen‐Bellingshausen Basin in the 2000s, but is discernible in portions of the Southwest Pacific Basin by the 2010s. These results indicate that bottom water freshening, stemming from strong freshening of Ross Shelf Waters, is being advected along deep isopycnals and mixed into deep basins, albeit on longer timescales than the dynamically driven, wave‐propagated warming signal. We quantify the contribution of the warming to local sea level and heat budgets.
    Description
    Author Posting. © American Geophysical Union, 2019. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Oceans 124(3), (2019): 1778-1794, doi:10.1029/2018JC014775.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Purkey, S. G., Johnson, G. C., Talley, L. D., Sloyan, B. M., Wijffels, S. E., Smethie, W., Mecking, S., & Katsumata, K. (2019). Unabated bottom water warming and freshening in the south Pacific Ocean. Journal of Geophysical Research-Oceans, 124(3), 1778-1794.
     

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