Article (Scientific journals)
Gas transfer velocities of CO2 in three European estuaries (Randers Fjord, Scheldt and Thames)
Borges, Alberto; Delille, Bruno; Schiettecatte, Laure-Sophie et al.
2004In Limnology and Oceanography, 49 (5), p. 1630-1641
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Abstract :
[en] We measured the flux of CO2 across the air–water interface using the floating chamber method in three European estuaries with contrasting physical characteristics (Randers Fjord, Scheldt, and Thames). We computed the gas transfer velocity of CO2 (k) from the CO2 flux and concomitant measurements of the air–water gradient of the partial pressure of CO2 (pCO2). There was a significant linear relationship between k and wind speed for each of the three estuaries. The differences of the y-intercept and the slope between the three sites are related to differences in the contribution of tidal currents to water turbulence at the interface and fetch limitation. The contribution to k from turbulence generated by tidal currents is negligible in microtidal estuaries such as Randers Fjord but is substantial, at low to moderate wind speeds, in macrotidal estuaries such as the Scheldt and the Thames. Our results clearly show that in estuaries a simple parameterization of k as a function of wind speed is site specific and strongly suggest that the y-intercept of the linear relationship is mostly influenced by the contribution of tidal currents, whereas the slope is influenced by fetch limitation. This implies that substantial errors in flux computations are incurred if generic relationships of the gas transfer velocity as a function of wind speed are employed in estuarine environments for the purpose of biogas air–water flux budgets and ecosystem metabolic studies.
Disciplines :
Earth sciences & physical geography
Aquatic sciences & oceanology
Author, co-author :
Borges, Alberto  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Delille, Bruno  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique
Schiettecatte, Laure-Sophie
Gazeau, Frédéric
Abril, Gwenaël
Frankignoulle, Michel
Language :
English
Title :
Gas transfer velocities of CO2 in three European estuaries (Randers Fjord, Scheldt and Thames)
Publication date :
2004
Journal title :
Limnology and Oceanography
ISSN :
0024-3590
eISSN :
1939-5590
Publisher :
American Society of Limnology & Oceanography/Kansas, Waco, United States - Texas
Volume :
49
Issue :
5
Pages :
1630-1641
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Biogest - Eurotroph
Funders :
DG RDT - Commission Européenne. Direction Générale de la Recherche et de l'Innovation [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Commentary :
Copyright, 2004 by the American Society of Limnology and Oceanography, Inc.
Available on ORBi :
since 05 December 2008

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