GHG EMISSIONS (CO₂, CH₄) FROM EASTMAIN-1 RESERVOIR AND NATURAL LAKES (QUEBEC, CANADA) MEASURED WITH DIFFERENT TECHNIQUES

Bastien, J.¹, Demarty, M.¹ and Tremblay, A.^2
1 Environnement Illimité, 1453 Saint-Timothée Montréal, Québec, Canada (julie.bastien@envill.com, maud.demarty@envill.com)
² Hydro-Québec Production, 75 René-Lévesque Blvd West, Montréal, Québec, Canada (tremblay.alain@hydro.qc.ca)

Eastmain-1 net emission project (www.eastmain1.org, EM-1) is the first project where greenhouse gas (GHG) emissions were monitored before and after its impoundment to determine the net GHG emissions. These are the emissions related to the creation of a reservoir minus those that would have been emitted or absorbed by the natural systems over a 100-year period. This large study is realized in collaboration with Environnement IIlimité Inc., University du Quebec in Montreal, McGill University and Environment Canada. The GHG (CO₂, CH₄ and N₂O) fluxes and partial pressures (pCO₂, pCH₄) measurements were carried out during the open-water period and under-ice cover on EM-1 reservoir and natural aquatic environments (lakes, rivers) using different techniques (floating chamber, thin boundary layer equation) and instruments (various gas analyzers and gas chromatography). CO₂ and CH₄ fluxes measured in the EM-1 reservoir varied between 0 to  9 times higher than those measured in natural aquatic systems. The variability of the observed CO₂ and CH₄ fluxes is partly related to the measurement techniques and instruments used and will be presented.

 

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