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    Climate variability in the equatorial Pacific Ocean induced by decadal variability of mixing coefficient

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    jpo3060%2E1.pdf (1.649Mb)
    Date
    2007-05
    Author
    Huang, Chuan Jiang  Concept link
    Wang, Wei  Concept link
    Huang, Rui Xin  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4148
    As published
    https://doi.org/10.1175/jpo3060.1
    DOI
    10.1175/jpo3060.1
    Keyword
     Climate variability; Mixing; El Nino; Isopycnal coordinates; Pacific Ocean 
    Abstract
    The circulation in the equatorial Pacific Ocean is studied in a series of numerical experiments based on an isopycnal coordinate model. The model is subject to monthly mean climatology of wind stress and surface thermohaline forcing. In response to decadal variability in the diapycnal mixing coefficient, sea surface temperature and other properties of the circulation system oscillate periodically. The strongest sea surface temperature anomaly appears in the geographic location of Niño-3 region with the amplitude on the order of 0.5°C, if the model is subject to a 30-yr sinusoidal oscillation in diapycnal mixing coefficient that varies between 0.03 × 10−4 and 0.27 × 10−4 m2 s−1. Changes in diapycnal mixing coefficient of this amplitude are within the bulk range consistent with the external mechanical energy input in the global ocean, especially when considering the great changes of tropical cyclones during the past decades. Thus, time-varying diapycnal mixing associated with changes in wind energy input into the ocean may play a nonnegligible role in decadal climate variability in the equatorial circulation and climate.
    Description
    Author Posting. © American Meteorological Society, 2007. 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 37 (2007): 1163-1176, doi:10.1175/jpo3060.1.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Physical Oceanography 37 (2007): 1163-1176
     

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