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    Original Research Papers

    New early winter fCO2 data reveal continuous uptake of CO2 by the Weddell Sea

    Authors:

    M. H. C. Stoll ,

    Netherlands Institute for Sea Research, NL
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    H. J. W. De Baar,

    Netherlands Institute for Sea Research, NL
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    M. Hoppema,

    University of Bremen, FBI IUP, Dept. Tracer Oceanography, DE
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    E. Fahrbach

    Alfred Wegener Institute for Polar and Marine Research, DE
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    Abstract

    The Antarctic Ocean has been thought to be unimportant for the uptake of CO2 since upwelling of CO2-enriched deep waters would favour outgassing. Here we present the first direct fCO2 measurements obtained in early winter under the ice which, combined with estimated entrainment rates, show that the Weddell Sea, an area of intense upwelling manifested by the doming structure of the cyclonic gyre, has the capability to be almost continuously a sink for atmospheric CO2. A flux, effective after the ice cover disappears, is estimated to be — 0.74 ± 0.7 mmol/m-2 d-1. Combined with a flux estimate in late autumn (- 2.0 mmol m-2 d-1) integrated over the area of the central Weddell Gyre, a carbon uptake of 0.24 × 1013 gC y-1 (≈ 2.4× 10-3 GtC y-1 being ≈ 1‰ of global uptake) is computed, which is about a third of the strength of the biological pump of the Weddell Sea.

    How to Cite: Stoll, M.H.C., De Baar, H.J.W., Hoppema, M. and Fahrbach, E., 1999. New early winter fCO2 data reveal continuous uptake of CO2 by the Weddell Sea. Tellus B: Chemical and Physical Meteorology, 51(3), pp.679–687. DOI: http://doi.org/10.3402/tellusb.v51i3.16460
      Published on 01 Jan 1999
    Peer Reviewed
     CC BY 4.0
     Accepted on 15 Aug 1998            Submitted on 21 Jan 1998

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