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    Assessment of numerical simulations of deep circulation and variability in the Gulf of Mexico using recent observations

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    Article (4.735Mb)
    Date
    2020-04-08
    Author
    Morey, Steven L.  Concept link
    Gopalakrishnan, Ganesh  Concept link
    Pallás-Sanz, Enric  Concept link
    Azevedo Correia De Souza, Joao Marcos  Concept link
    Donohue, Kathleen A.  Concept link
    Pérez-Brunius, Paula  Concept link
    Dukhovskoy, Dmitry S.  Concept link
    Chassignet, Eric P.  Concept link
    Cornuelle, Bruce D.  Concept link
    Bower, Amy S.  Concept link
    Furey, Heather H.  Concept link
    Hamilton, Peter  Concept link
    Candela, Julio  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/26392
    As published
    https://doi.org/10.1175/JPO-D-19-0137.1
    DOI
    10.1175/JPO-D-19-0137.1
    Keyword
     Ocean circulation; Abyssal circulation; Bottom currents/bottom water; Eddies; Ocean models 
    Abstract
    Three simulations of the circulation in the Gulf of Mexico (the “Gulf”) using different numerical general circulation models are compared with results of recent large-scale observational campaigns conducted throughout the deep (>1500 m) Gulf. Analyses of these observations have provided new understanding of large-scale mean circulation features and variability throughout the deep Gulf. Important features include cyclonic flow along the continental slope, deep cyclonic circulation in the western Gulf, a counterrotating pair of cells under the Loop Current region, and a cyclonic cell to the south of this pair. These dominant circulation features are represented in each of the ocean model simulations, although with some obvious differences. A striking difference between all the models and the observations is that the simulated deep eddy kinetic energy under the Loop Current region is generally less than one-half of that computed from observations. A multidecadal integration of one of these numerical simulations is used to evaluate the uncertainty of estimates of velocity statistics in the deep Gulf computed from limited-length (4 years) observational or model records. This analysis shows that the main deep circulation features identified from the observational studies appear to be robust and are not substantially impacted by variability on time scales longer than the observational records. Differences in strengths and structures of the circulation features are identified, however, and quantified through standard error analysis of the statistical estimates using the model solutions.
    Description
    Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 50(4), (2020): 1045-1064, doi:10.1175/JPO-D-19-0137.1.
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    • Physical Oceanography (PO)
    Suggested Citation
    Morey, S. L., Gopalakrishnan, G., Pallas Sanz, E., Correia De Souza,Joao Marcos Azevedo, Donohue, K., Perez-Brunius, P., Dukhovskoy, D., Chassignet, E., Cornuelle, B., Bower, A., Furey, H., Hamilton, P., & Candela, J. (2020). Assessment of numerical simulations of deep circulation and variability in the Gulf of Mexico using recent observations. Journal of Physical Oceanography, 50(4), 1045-1064.
     

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