Physics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..995y&link_type=abstract
Geophysical Research Letters, Volume 21, Issue 11, p. 995-998
Physics
2
Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry
Scientific paper
Beaver impoundments trap large amounts of organic matter, and remineralization of the organic matter to CO2 could make them a significant source of atmospheric CO2. Measurements in two beaver impoundments in the Adirondack Park of New York State indicated that: (i) during the ice-free season CO2 emission averaged 197 mmol m-2d-1 (ii) concentrations of dissolved inorganic carbon (DIC) in the water column were always >100 μM, reaching >1000 μM beneath ice cover and midsummer; and (iii) the rate of CO2 production by sediment samples from beneath the water column could exceed 300 mmol m-2d-1 in midsummer. The CO2 emitted from the impoundments to the atmosphere is supplied both by the sediments beneath the impoundment and by transport into the water column from the surrounding uplands. If beaver impoundments cover 3% of the landscape in north temperate forests then the magnitude of the presumed CO2 sink in this landscape would be reduced by 7% compared with estimates based only on the terrestrial component.
Fahey Timothy J.
Yavitt Joseph B.
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