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Carbon dioxide and methane annual emissions from two boreal reservoirs and nearby lakes in Quebec, Canada

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Author(s): M. Demarty | J. Bastien | A. Tremblay

Journal: Biogeosciences Discussions
ISSN 1810-6277

Volume: 6;
Issue: 2;
Start page: 2939;
Date: 2009;
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ABSTRACT
The results of dissolved GHG (CO2 and CH4) measurement campaigns carried out in Quebec (Canada) during the open-water periods and under-ice in a newly created reservoir (Eastmain 1), a 25 year old reservoir (Robert-Bourassa) and in three reference lakes are presented. While CO2 partial pressures varied with season with a net increase under the ice cover, CH4 partial pressures did not. We were able to extrapolate the highest CO2 partial pressures reached in the different studied systems just before ice break-up with high spring emission period. We then estimated the springtime CO2 fluxes and compared them to annual CO2 fluxes and GHG fluxes. Thus we clearly demonstrated that in our systems CH4 fluxes was of minor importance in the GHG emissions, CO2 fluxes representing around 90% of the annual fluxes. We also pointed out the importance of springtime emissions in the annual budget.

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