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| | | METHANE AND NITROUS OXIDE EMISSIONS FROM CANADIAN RESERVOIRS
Tremblay1, A., M. Demarty2 and J. Bastien2
1 : Hydro-Québec Production, Direction Barrages et Environnement, Montréal, Québec (tremblay.Alain@hydro.qc.ca)
2 : Environnement Illimité Inc., Montréal, Québec (maud.demarty@envill.com, julie.bastien@envill.com)
The growing concern regarding the long-term contribution of freshwater reservoirs to atmospheric greenhouse gases (GHG), led Hydro-Québec and Manitoba Hydro, to study GHG emissions from their reservoirs. The major greenhouse gases (GHGs) are carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). In order to take into account spatial and temporal variability of the GHG emissions, we have used floating chambers (spatial resolution) and automated systems (temporal resolution). The results of CH4 and N2O fluxes and dissolved gas measurement campaigns carried out during the open-water and ice cover periods in several reservoirs are presented, and compared to those obtained in the natural aquatic environments. Generally, CH4 emissions increased after flooding by 3 to 5 times the values measured in natural lakes. Rapidly, within 2 or 3 years after flooding CH4 emissions are comparable to natural aquatic environments. No changes were observed in the emissions before and after flooding. CH4 and N2O emissions will also be compared with CO2 emissions.
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