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Production of the greenhouse gases CH 4 and CO 2 by hydroelectric reservoirs of the boreal region
Author(s) -
Duchemin E.,
Lucotte M.,
Canuel R.,
Chamberland A.
Publication year - 1995
Publication title -
global biogeochemical cycles
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.512
H-Index - 187
eISSN - 1944-9224
pISSN - 0886-6236
DOI - 10.1029/95gb02202
Subject(s) - carbon dioxide , greenhouse gas , peat , environmental science , water column , methane , atmosphere (unit) , atmospheric sciences , sampling (signal processing) , flux (metallurgy) , hydrology (agriculture) , environmental chemistry , chemistry , oceanography , geology , meteorology , ecology , physics , geotechnical engineering , organic chemistry , filter (signal processing) , computer science , computer vision , biology
The emission fluxes and the distribution of dissolved methane (CH 4 ) and carbon dioxide (CO 2 ) were determined for 11 sampling stations in two hydroelectric reservoirs (flooded since 1978 and 1993) located in the James Bay territory of northern Québec. The measured benthic fluxes for the two greenhouse gases were found to be either higher or similar to those determined at the water‐air interface during the ice‐free sampling periods. For the 2 year duration of the study, emission fluxes of CH 4 to the atmosphere generally varied between 5 and 10 mg m −2 d −1 , while those for CO 2 ranged from 500 to 1100 mg m −2 d −1 . Furthermore, through the use of static chambers at the water‐air interface, we determined that the emission fluxes for the gases are controlled by molecular diffusion. Our calculated fluxes have been separated into two groups: (1) regular emission fluxes and (2) above‐average emission fluxes. The first type comprises the majority of fluxes measured during the sampling periods (i.e., 88% for CH 4 and 87% for CO 2 ). The second group reflects unusual sampling conditions (e.g., strong winds, water column depths of less than 1 m, or flooded peatland mats floating at the surface). Although data for this group are limited, our preliminary results suggest that they may be an important component in an atmospheric emissions budget for large reservoirs. Concentration profiles for CH 4 and CO 2 dissolved in the water column clearly show that oxidation and/or horizontal advection of these gases are controlling factors in their subsequent release to the atmosphere. Most of the CH 4 is oxidized within the first 25 cm above the flooded soil‐water interface. Consequently, neither benthic emissions of CH 4 and CO 2 nor the type of flooded soil appear to control atmospheric emissions of these gases from hydroelectric reservoirs.