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    Mesoscale modulation of air-sea CO2 flux in Drake Passage

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    Song_et_al-2016-Journal_of_Geophysical_Research__Oceans.pdf (4.062Mb)
    Date
    2016-09-10
    Author
    Song, Hajoon  Concept link
    Marshall, John  Concept link
    Munro, David R.  Concept link
    Dutkiewicz, Stephanie  Concept link
    Sweeney, Colm  Concept link
    McGillicuddy, Dennis J.  Concept link
    Hausmann, Ute  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8575
    As published
    https://doi.org/10.1002/2016JC011714
    DOI
    10.1002/2016JC011714
    Keyword
     CO2 flux; Mesoscale eddy; Southern Ocean; Vertical mixing; Nutrient fluxes 
    Abstract
    We investigate the role of mesoscale eddies in modulating air-sea CO2 flux and associated biogeochemical fields in Drake Passage using in situ observations and an eddy-resolving numerical model. Both observations and model show a negative correlation between temperature and partial pressure of CO2 (pCO2) anomalies at the sea surface in austral summer, indicating that warm/cold anticyclonic/cyclonic eddies take up more/less CO2. In austral winter, in contrast, relationships are reversed: warm/cold anticyclonic/cyclonic eddies are characterized by a positive/negative pCO2 anomaly and more/less CO2 outgassing. It is argued that DIC-driven effects on pCO2 are greater than temperature effects in austral summer, leading to a negative correlation. In austral winter, however, the reverse is true. An eddy-centric analysis of the model solution reveals that nitrate and iron respond differently to the same vertical mixing: vertical mixing has a greater impact on iron because its normalized vertical gradient at the base of the surface mixed layer is an order of magnitude greater than that of nitrate.
    Description
    Author Posting. © American Geophysical Union, 2016. 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 121 (2016): 6635–6649, doi:10.1002/2016JC011714.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of Geophysical Research: Oceans 121 (2016): 6635–6649
     

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