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Interannual controls on Weddell Sea surface water fCO2 during the autumn–winter transition phase

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Show simple item record Bellerby, Richard G. J. eng Hoppema, M. eng Fahrbach, E. eng Baar, H. J. W. de eng Stoll, M. eng 2004-07-12T09:22:15Z 2004-08-03T12:58:19Z 2004-08-26T11:57:57Z 2004-07-12T09:22:15Z 2004-08-03T12:58:19Z 2004-08-26T11:57:57Z 2004-06 eng
dc.identifier.citation Deep Sea Research Part I: Oceanographic Research Papers 2004 51(6): 793-808 en
dc.identifier.issn 0967-0637 eng
dc.description.abstract The fugacity of carbon dioxide (fCO2) of the surface waters of the Weddell Sea along the prime meridian has been described for the austral autumn in 1996 and 1998. For individual years, fCO2 has a strong linear relationship with sea surface temperature, although the relationships cannot be reconciled to provide an interannually consistent algorithm for remotely sensed assessment of fCO2: However, from the assumption that Weddell Sea surface water has a single end member (upwelled Warm Deep Water) we have determined the relative contributions of heating, ice-melt, and biological activity on fCO2: A breakdown of the controls shows that the measured annual fCO2 distributions can be recreated for both transects by adjusting solely for thermodynamic forcing, and model adjustments for salinity are small except in regions of significant upwelling during 1998. The incorporation of nitrate utilisation into the model results in a general and significant underestimation of fCO2: This runs contrary to the earlier findings ofSabine and Key (Mar. Chem. 60 (1998) 95) in the Southern Ocean although it is consistent with models in the area (Louanchi et al., Deep-Sea Res. I 48 (2001) 1581). A major caveat to these findings is the significant departure ofthe thermodynamic model and a tightening ofthe nitrate-adjusted model in 1998 in areas with deeper mixing in the southern Weddell Sea. We propose that there are two reasons for the discrepancies in our model: the source waters are not as homogenous as the model assumes; and there are geographical and seasonal variations ofCO 2 exchange with the atmosphere and the input of inorganic carbon and nitrate from below the mixed layer resulting in imbalances in the mixed layer concentration ratios. en
dc.format.extent 55009 bytes eng
dc.format.extent 2314258 bytes eng
dc.format.extent 166 bytes eng
dc.format.mimetype text/plain eng
dc.format.mimetype application/pdf eng
dc.format.mimetype text/plain eng
dc.language.iso eng eng
dc.publisher Elsevier eng
dc.title Interannual controls on Weddell Sea surface water fCO2 during the autumn–winter transition phase eng
dc.type Journal article eng
dc.type Peer reviewed eng
dc.rights.holder Copyright 2004 Elsevier Ltd.
bora.peerreviewed Peer reviewed eng
bibo.doi eng

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