TY - JOUR
T1 - Hydraulic reversals and episodic methane emissions during drought cycles in mires
AU - Romanowicz, E. A.
AU - Siegel, D. I.
AU - Glaser, P. H.
PY - 1993/1/1
Y1 - 1993/1/1
N2 - At Glacial Lake Agassiz Peatlands, Minnesota, during the summer 1990 drought, regional ground water discharged from the mineral soil underlying the peat to raised bogs. Concentrations of dissolved CH 4 in pore water showed that much of the peat column was supersaturated with respect to a reference standard of 1 atm partial pressure CH 4 . As the severity of the drought lessens, the upper peat column was resaturated with precipitation-derived water. Ground-water flow was then controlled by local, precipitation-driven, recharge flow systems, and the regional ground water that was discharged affected only the peat immediately above the mineral soil-peat interface. During the summer of 1991, concentrations of dissolved CH 4 in pore water were all undersaturated with respect to 1 atm partial pressure CH 4 . The decrease in the amount of dissolved CH 4 in the pore water was probably caused by changes in the CH 4 flux and degassing to the unsaturated zone and by changes in the partial pressure of gaseous CH 4 in the peat as the peat volume increased as it resaturated. -from Authors
AB - At Glacial Lake Agassiz Peatlands, Minnesota, during the summer 1990 drought, regional ground water discharged from the mineral soil underlying the peat to raised bogs. Concentrations of dissolved CH 4 in pore water showed that much of the peat column was supersaturated with respect to a reference standard of 1 atm partial pressure CH 4 . As the severity of the drought lessens, the upper peat column was resaturated with precipitation-derived water. Ground-water flow was then controlled by local, precipitation-driven, recharge flow systems, and the regional ground water that was discharged affected only the peat immediately above the mineral soil-peat interface. During the summer of 1991, concentrations of dissolved CH 4 in pore water were all undersaturated with respect to 1 atm partial pressure CH 4 . The decrease in the amount of dissolved CH 4 in the pore water was probably caused by changes in the CH 4 flux and degassing to the unsaturated zone and by changes in the partial pressure of gaseous CH 4 in the peat as the peat volume increased as it resaturated. -from Authors
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U2 - 10.1130/0091-7613(1993)021<0231:HRAEME>2.3.CO;2
DO - 10.1130/0091-7613(1993)021<0231:HRAEME>2.3.CO;2
M3 - Article
AN - SCOPUS:0027334270
SN - 0091-7613
VL - 21
SP - 231
EP - 234
JO - Geology
JF - Geology
IS - 3
ER -