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    Anomalous chlorofluorocarbon uptake by mesoscale eddies in the Drake Passage region

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    jgrc21073.pdf (1.708Mb)
    Date
    2015-02-23
    Author
    Song, Hajoon  Concept link
    Marshall, John C.  Concept link
    Gaube, Peter  Concept link
    McGillicuddy, Dennis J.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7287
    As published
    https://doi.org/10.1002/2014JC010292
    DOI
    10.1002/2014JC010292
    Keyword
     Mesoscale eddies; Chlorofluorocarbon-11; Air-sea flux; Southern Ocean 
    Abstract
    The role of mesoscale eddies in the uptake of anthropogenic chlorofluorocarbon-11 (CFC-11) gas is investigated with a 1/20° eddy-resolving numerical ocean model of a region of the Southern Ocean. With a relatively fast air-sea equilibrium time scale (about a month), the air-sea CFC-11 flux quickly responds to the changes in the mixed layer CFC-11 partial pressure (pCFC-11). At the mesoscale, significant correlations are observed between pCFC-11 anomaly, anomalies in sea surface temperature (SST), net heat flux, and mixed layer depth. An eddy-centric analysis of the simulated CFC-11 field suggests that anticyclonic warm-core eddies generate negative pCFC-11 anomalies and cyclonic cold-core eddies generate positive anomalies of pCFC-11. Surface pCFC-11 is modulated by mixed layer dynamics in addition to CFC-11 air-sea fluxes. A negative cross correlation between mixed layer depth and surface pCFC-11 anomalies is linked to higher CFC-11 uptake in anticyclones and lower CFC-11 uptake in cyclones, especially in winter. An almost exact asymmetry in the air-sea CFC-11 flux between cyclones and anticyclones is found.
    Description
    Author Posting. © American Geophysical Union, 2015. 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: Oceans 120 (2015): 1065–1078, doi:10.1002/2014JC010292.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of Geophysical Research: Oceans 120 (2015): 1065–1078
     

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