Reference : Gas transfer velocities of CO2 in three European estuaries (Randers Fjord, Scheldt and T...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Life sciences : Aquatic sciences & oceanology
http://hdl.handle.net/2268/2108
Gas transfer velocities of CO2 in three European estuaries (Randers Fjord, Scheldt and Thames)
English
Borges, Alberto mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
Delille, Bruno mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
Schiettecatte, Laure-Sophie [> > > >]
Gazeau, Frédéric [> > > >]
Abril, Gwenaël [> > > >]
Frankignoulle, Michel [> > > >]
2004
Limnology & Oceanography
American Society of Limnology & Oceanography/Kansas
49
5
1630-1641
Yes (verified by ORBi)
International
0024-3590
Waco
TX
[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.
Commission européenne : Direction générale de la Recherche ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Biogest - Eurotroph
Researchers
http://hdl.handle.net/2268/2108
also: http://hdl.handle.net/2268/2695
http://aslo.org/lo/toc/vol_49/issue_5/1630.pdf
Copyright, 2004 by the American Society of Limnology and Oceanography, Inc.

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