Do hydroelectric reservoirs emit greenhouse gases? Environmental Management, 33(1

ABSTRACT / The fluxes of carbon dioxide were determined at the water–air interface using floating chambers connected to an automated nondispersive infrared instrument (NDIR) or a Fourier transform infrared instrument (FTIR). The fluxes were measured in 2002 over 280 sites in Canadian reservoirs, riv-ers, and natural lakes. Mean measured emissions of CO2 in old Québec reservoirs ( 10 years) were around 1600 1500 mg CO2/m 2/day and around 735 1125 mg CO2/m 2/day in natural lakes. In a young Québec reservoir (5 years old), values were higher, with mean measured emissions around 4400 4000 mg CO2/m 2/day. In Manitoba, old reservoirs had mean values around 3350 2725 mg CO2/