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    What determines the spatial pattern in summer upwelling trends on the U.S. West Coast?

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    2012JC008016.pdf (414.1Kb)
    Date
    2012-08-09
    Author
    Seo, Hyodae  Concept link
    Brink, Kenneth H.  Concept link
    Dorman, Clive E.  Concept link
    Koracin, Darko  Concept link
    Edwards, Christopher A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5379
    As published
    https://doi.org/10.1029/2012JC008016
    DOI
    10.1029/2012JC008016
    Keyword
     Coastal upwelling; Multidecadal trend; Wind stress curl 
    Abstract
    Analysis of sea surface temperature (SST) from coastal buoys suggests that the summertime over-shelf water temperature off the U.S. West Coast has been declining during the past 30 years at an average rate of −0.19°C decade−1. This cooling trend manifests itself more strongly off south-central California than off Oregon and northern California. The variability and trend in the upwelling north of off San Francisco are positively correlated with those of the equatorward wind, indicating a role of offshore Ekman transport in the north. In contrast, Ekman pumping associated with wind stress curls better explains the stronger and statistically more significant cooling trend in the south. While the coast-wide variability and trend in SST are strongly correlated with those of large-scale modes of climate variability, they in general fail to explain the southward intensification of the trend in SST and wind stress curl. This result suggests that the local wind stress curl, often topographically forced, may have played a role in the upwelling trend pattern.
    Description
    Author Posting. © American Geophysical Union, 2012. 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 117 (2012): C08012, doi:10.1029/2012JC008016.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Geophysical Research 117 (2012): C08012
     

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