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Variability of the gas transfer velocity of CO2 in a macrotidal estuary (the Scheldt)
Borges, A.V.; Vanderborcht, J.P.; Schiettecatte, L.-S.; Gazeau, F.; Ferrón-Smith, S.; Delille, B.; Frankignoulle, M. (2004). Variability of the gas transfer velocity of CO2 in a macrotidal estuary (the Scheldt). Estuaries 27(4): 593-603
In: Estuaries. The Estuarine Research Federation, Chesapeake Biological Laboratory: Columbia, S.C., etc.,. ISSN 0160-8347, more
Peer reviewed article  

Available in  Authors | Datasets 
    VLIZ: Open Repository 66887 [ OMA ]

Keywords
    Carbon dioxide; Estuaries; Gas exchange; Velocity; ANE, Netherlands, Westerschelde [Marine Regions]; Belgium, Zeeschelde [Marine Regions]; Marine; Brackish water

Project Top | Authors | Datasets 
  • Carbon and nutrients cycles in the inner Scheldt estuary (Sainte-Anna), more

Authors  Top | Datasets 
  • Borges, A.V., more
  • Vanderborcht, J.P., more
  • Schiettecatte, L.-S., more
  • Gazeau, F., more
  • Ferrón-Smith, S.
  • Delille, B., more
  • Frankignoulle, M., more

Abstract
    We report a large set of 295 interfacial carbon dioxide (CO2) flux measurements obtained in the Scheldt estuary in November 2002 and April 2003, using the floating chamber method. From concomitant measurements of the air-water CO2 gradient, we computed the gas transfer velocity of CO2. The gas transfer velocity is well correlated to wind speed and a simple linear regression function gives the most consistent fit to the data. Based on water current measurements, we estimated the contribution of water current induced turbulence to the gas transfer velocity, using the conceptual relationship of O’Connor and Dobbins (1958). This allowed us to construct an empirical relationship to compute the gas transfer velocity of CO2 that accounts for the contribution of wind and water current. Based on this relationship, the spatial and temporal variability of the gas transfer velocity in the Scheldt estuary was investigated.Water currents contribute significantly to the gas transfer velocity, but the spatial and temporal variability (from daily to seasonal scales) is mainly related to wind speed variability.

Datasets (2)
  • Continuous acquisition of inorganic and organic carbon and associated parameters at the station Ste Anna, Antwerp, more
  • EUROTROPH project dataset: Nutrients Cycling and the Trophic Status of Coastal Ecosystems, more

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