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    Investigating the local atmospheric response to a realistic shift in the Oyashio Sea surface Temperature Front

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    jcli-d-14-00285%2E1.pdf (4.572Mb)
    Date
    2015-02-01
    Author
    Smirnov, Dimitry  Concept link
    Newman, Matthew  Concept link
    Alexander, Michael A.  Concept link
    Kwon, Young-Oh  Concept link
    Frankignoul, Claude  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7200
    As published
    https://doi.org/10.1175/JCLI-D-14-00285.1
    DOI
    10.1175/JCLI-D-14-00285.1
    Keyword
     Atmosphere-ocean interaction; Atmospheric circulation; Boundary layer; Cyclogenesis/cyclolysis; Diabatic heating; Extratropical cyclones 
    Abstract
    The local atmospheric response to a realistic shift of the Oyashio Extension SST front in the western North Pacific is analyzed using a high-resolution (HR; 0.25°) version of the global Community Atmosphere Model, version 5 (CAM5). A northward shift in the SST front causes an atmospheric response consisting of a weak surface wind anomaly but a strong vertical circulation extending throughout the troposphere. In the lower troposphere, most of the SST anomaly–induced diabatic heating is balanced by poleward transient eddy heat and moisture fluxes. Collectively, this response differs from the circulation suggested by linear dynamics, where extratropical SST forcing produces shallow anomalous heating balanced by strong equatorward cold air advection driven by an anomalous, stationary surface low to the east. This latter response, however, is obtained by repeating the same experiment except using a relatively low-resolution (LR; 1°) version of CAM5. Comparison to observations suggests that the HR response is closer to nature than the LR response. Strikingly, HR and LR experiments have almost identical vertical profiles of . However, diagnosis of the diabatic quasigeostrophic vertical pressure velocity (ω) budget reveals that HR has a substantially stronger response, which together with upper-level mean differential thermal advection balances stronger vertical motion. The results herein suggest that changes in transient eddy heat and moisture fluxes are critical to the overall local atmospheric response to Oyashio Front anomalies, which may consequently yield a stronger downstream response. These changes may require the high resolution to be fully reproduced, warranting further experiments of this type with other high-resolution atmosphere-only and fully coupled GCMs.
    Description
    Author Posting. © American Meteorological Society, 2015. 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 Climate 28 (2015): 1126–1147, doi:10.1175/JCLI-D-14-00285.1.
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    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Climate 28 (2015): 1126–1147
     

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