Reference : Determination of air‐sea ice transfer coefficient for CO2: Significant contribution o...
Scientific congresses and symposiums : Poster
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/187935
Determination of air‐sea ice transfer coefficient for CO2: Significant contribution of gas bubble transport during sea ice growth
English
Kotovitch, Marie mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
Moreau, S. []
Zhou, Jiayun []
Vancoppenolle, M. []
Dieckmann, G. []
Evers, K.-U. []
Van Der Linden, Fanny mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
Thomas, D. []
Tison, J.-L. []
Delille, Bruno mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie chimique >]
Sep-2015
No
No
International
Solas Open Science Conference
7-11 September
SOLAS
Kiel
Germany
[en] Air‐ice CO2 fluxes were measured continuously from the freezing of a young sea‐ice cover until its decay.
Cooling seawater was as a sink for atmospheric CO2 but asthe ice crystalsformed,sea ice shifted to a source releasing CO2 to the atmosphere throughout the whole ice growth. Atmospheric warming initiated the decay, re‐shifting sea‐ice to a CO2 sink. Combining these CO2 fluxes with the partial pressure of CO2 within sea ice, we determined gas transfer coefficients for CO2 at air‐ice interface for growth and decay. We hypothesize that this difference originates from the transport of gas bubbles during ice growth, while only
diffusion occurs during ice melt. In parallel, we used a 1D biogeochemical model to mimic the observed CO2 fluxes. The formation of gas bubbles was crucial to reproduce fluxes during ice growth where gas bubbles may account for up to 92 % of the upward CO2 fluxes.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy
Researchers
http://hdl.handle.net/2268/187935

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