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    Sea surface temperature signatures of oceanic internal waves in low winds

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    2006JC003947.pdf (3.789Mb)
    Date
    2007-06-20
    Author
    Farrar, J. Thomas  Concept link
    Zappa, Christopher J.  Concept link
    Weller, Robert A.  Concept link
    Jessup, Andrew T.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/1795
    As published
    https://doi.org/10.1029/2006JC003947
    DOI
    10.1029/2006JC003947
    Keyword
     Internal waves; Upper-ocean processes 
    Abstract
    In aerial surveys conducted during the Tropical Ocean–Global Atmosphere Coupled Ocean-Atmosphere Response Experiment and the low-wind component of the Coupled Boundary Layer Air-Sea Transfer (CBLAST-Low) oceanographic field programs, sea surface temperature (SST) variability at relatively short spatial scales (O(50 m) to O(1 km)) was observed to increase with decreasing wind speed. A unique set of coincident surface and subsurface oceanic temperature measurements from CBLAST-Low is used to investigate the subsurface expression of this spatially organized SST variability, and the SST variability is linked to internal waves. The data are used to test two previously hypothesized mechanisms for SST signatures of oceanic internal waves: a modulation of the cool-skin effect and a modulation of vertical mixing within the diurnal warm layer. Under conditions of weak winds and strong insolation (which favor formation of a diurnal warm layer), the data reveal a link between the spatially periodic SST fluctuations and subsurface temperature and velocity fluctuations associated with oceanic internal waves, suggesting that some mechanism involving the diurnal warm layer is responsible for the observed signal. Internal-wave signals in skin temperature very closely resemble temperature signals measured at a depth of about 20 cm, indicating that the observed internal-wave SST signal is not a result of modulation of the cool-skin effect. Numerical experiments using a one-dimensional upper ocean model support the notion that internal-wave heaving of the warm-layer base can produce alternating bands of relatively warm and cool SST through the combined effects of surface heating and modulation of wind-driven vertical shear.
    Description
    Author Posting. © American Geophysical Union, 2007. 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 112 (2007): C06014, doi:10.1029/2006JC003947.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Geophysical Research 112 (2007): C06014
     

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