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    Observations of the subtropical mode water evolution from the Kuroshio Extension System Study

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    Date
    2006-03
    Author
    Qiu, Bo  Concept link
    Hacker, Peter  Concept link
    Chen, Shuiming  Concept link
    Donohue, Kathleen A.  Concept link
    Watts, D. Randolph  Concept link
    Mitsudera, Humio  Concept link
    Hogg, Nelson G.  Concept link
    Jayne, Steven R.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4216
    As published
    https://doi.org/10.1175/JPO2849.1
    DOI
    10.1175/JPO2849.1
    Abstract
    Properties and seasonal evolution of North Pacific Ocean subtropical mode water (STMW) within and south of the Kuroshio Extension recirculation gyre are analyzed from profiling float data and additional hydrographic and shipboard ADCP measurements taken during 2004. The presence of an enhanced recirculation gyre and relatively low mesoscale eddy variability rendered this year favorable for the formation of STMW. Within the recirculation gyre, STMW formed from late-winter convection that reached depths greater than 450 m near the center of the gyre. The lower boundary of STMW, corresponding to σθ 25.5 kg m−3, was set by the maximum depth of the late-winter mixed layer. Properties within the deep portions of the STMW layer remained largely unchanged as the season progressed. In contrast, the upper boundary of the STMW layer eroded steadily as the seasonal thermocline deepened from late April to August. Vertical eddy diffusivity responsible for this erosion was estimated from a budget analysis of potential vorticity to be in the range of 2–5 × 10−4 m2 s−1. The latitudinal extent of the STMW formation was narrow, extending from 30°N to the Kuroshio Extension jet near 35°N. South of 30°N, STMW did not form locally but was transported from the recirculation gyre by lateral induction.
    Description
    Author Posting. © American Meteorological Society, 2006. 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 36 (2006): 457-473, doi:10.1175/JPO2849.1.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Physical Oceanography 36 (2006): 457-473
     
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