Other
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3406402c&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 6, CiteID L06402
Other
7
Atmospheric Composition And Structure: Ion Chemistry Of The Atmosphere (2419, 2427), Biogeosciences: Carbon Cycling (4806), Hydrology: Wetlands (0497), Electromagnetics: Instruments And Techniques
Scientific paper
We tested a set of surface common mid-point (CMP) ground penetrating radar (GPR) surveys combined with elevation rods (to monitor surface deformation) and gas flux measurements to investigate in-situ biogenic gas dynamics and ebullition events in a northern peatland (raised bog). The main findings are: (1) changes in the two-way travel time from the surface to prominent reflectors allow estimation of average gas contents and evolution of free-phase gas (FPG); (2) peat surface deformation and gas flux measurements are strongly consistent with GPR estimated changes in FPG content over time; (3) rapid decreases in atmospheric pressure are associated with increased gas flux; and (4) single ebullition events can induce releases of methane much larger (up to 192 g/m2) than fluxes reported by others. These results indicate that GPR is a useful tool for assessing the spatial distribution, temporal variation, and volume of biogenic gas deposits in peatlands.
Comas Xavier
Reeve Andrew
Slater Lee
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