Methane release below a tropical hydroelectric dam
Article first published online: 23 JUN 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 12, June 2007
How to Cite
2007), Methane release below a tropical hydroelectric dam, Geophys. Res. Lett., 34, L12809, doi:10.1029/2007GL029479., , and (
- Issue published online: 23 JUN 2007
- Article first published online: 23 JUN 2007
- Manuscript Accepted: 17 APR 2007
- Manuscript Revised: 31 MAR 2007
- Manuscript Received: 25 JAN 2007
 Tropical reservoirs upstream from hydroelectric dams are known to release significant amounts of methane to the atmosphere. Here we demonstrate that methane emissions downstream from hydroelectric dams can also be large. Emissions of CH4 downstream of Balbina reservoir in the central Amazon basin (Brazil) were calculated from regular measurements of degassing in the outflow of the turbines and downstream diffusive losses. Annual emissions from the reservoir surface and downstream from the dam were 34 and 39 Gg C, respectively. The downstream emission alone represented the equivalent of 3% of all methane released from central Amazon floodplain.