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    Beaufort Gyre freshwater reservoir : state and variability from observations

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    2008JC005104.pdf (2.214Mb)
    Date
    2009-06-24
    Author
    Proshutinsky, Andrey  Concept link
    Krishfield, Richard A.  Concept link
    Timmermans, Mary-Louise  Concept link
    Toole, John M.  Concept link
    Carmack, Eddy C.  Concept link
    McLaughlin, Fiona A.  Concept link
    Williams, William J.  Concept link
    Zimmermann, Sarah  Concept link
    Itoh, Motoyo  Concept link
    Shimada, Koji  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3680
    As published
    https://doi.org/10.1029/2008JC005104
    DOI
    10.1029/2008JC005104
    Keyword
     Beaufort Gyre oceanography; Freshwater balance; Circulation and water masses 
    Abstract
    We investigate basin-scale mechanisms regulating anomalies in freshwater content (FWC) in the Beaufort Gyre (BG) of the Arctic Ocean using historical observations and data collected in 2003–2007. Specifically, the mean annual cycle and interannual and decadal FWC variability are explored. The major cause of the large FWC in the BG is the process of Ekman pumping (EP) due to the Arctic High anticyclonic circulation centered in the BG. The mean seasonal cycle of liquid FWC is a result of interplay between the mechanical (EP) and thermal (ice transformations) factors and has two peaks. One peak occurs around June–July when the sea ice thickness reaches its minimum (maximum ice melt). The second maximum is observed in November–January when wind curl is strongest (maximum EP) and the salt input from the growing ice has not yet reached its maximum. Interannual changes in FWC during 2003–2007 are characterized by a strong positive trend in the region varying by location with a maximum of approximately 170 cm a−1 in the center of EP influenced region. Decadal FWC variability in the period 1950–2000 is dominated by a significant change in the 1990s forced by an atmospheric circulation regime change. The center of maximum FWC shifted to the southeast and appeared to contract in area relative to the pre-1990s climatology. In spite of the areal reduction, the spatially integrated FWC increased by over 1000 km3 relative to climatology.
    Description
    Author Posting. © American Geophysical Union, 2009. 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 114 (2009): C00A10, doi:10.1029/2008JC005104.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Geophysical Research 114 (2009): C00A10
     

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