HR: 12:05h
AN: B52C-08    [Abstracts]
TI: A 30 year study of carbon, groundwater, and climate coupling in a large boreal peat basin
AU: * Glaser, P H
EM: glase001@umn.edu
AF: University of Minnesota, Department of Geology and Geophysics, Minneapolis, MN 55455, United States
AU: Siegel, D I
EM: disiegel@syr.edu
AF: Syracuse University, Department of Earth Sciences, Syracuse, NY 13244, United States
AU: Chanton, J P
EM: jchanton@mailer.fsu.edu
AF: Florida State University, Department of Oceanography, Tallahassee, FL 32306-4320, United States
AU: Reeve, A S
EM: asreeve@maine.edu
AF: University of Maine Orono, Department of Earth Sciences, Orono, ME 04469, United States
AU: Slater, L
EM: lslater@andromeda.rutgers.edu
AF: Rutgers-Newark, Department of Earth and Environmental Sciences, Newark, NJ 07102, United States
AU: Rosenberry, D O
EM: rosenber@usgs.gov
AF: United States Geological Survey, Denver Federal Center, Lakewood, CO 80225, United States
AU: Morin, P J
EM: lpaul@umn.edu
AF: University of Minnesota, Department of Geology and Geophysics, Minneapolis, MN 55455, United States
AU: Carpenter, M
EM: mccarp@dakotacom.net
AF: United States Geological Survey, 2679 N. Sundance Trail, Tucson, AZ 85746, United States
AU: Rhoades, J
EM: jrhoades@maine.edu
AF: University of Maine Orono, Department of Earth Sciences, Orono, ME 04469, United States
AU: Nolan, J
EM: jtnolan@pegasus.rutgers.edu
AF: Rutgers-Newark, Department of Earth and Environmental Sciences, Newark, NJ 07102, United States
AU: Parsekian, A
EM: parsekia@gmail.com
AF: Rutgers-Newark, Department of Earth and Environmental Sciences, Newark, NJ 07102, United States
AU: O'Brien, M
EM: mobrien@pegasus.rutgers.edu
AF: Rutgers-Newark, Department of Earth and Environmental Sciences, Newark, NJ 07102, United States
AU: Sarkar, S
EM: ssarka03@syr.edu
AF: Syracuse University, Department of Earth Sciences, Syracuse, NY 13244, United States
AU: Corbett, J E
EM: corbett@ocean.fsu.edu
AF: Florida State University, Department of Oceanography, Tallahassee, FL 32306-4320, United States
AU: D'Andrilli, J
EM: dandrilli@ocean.fsu.edu
AF: Florida State University, Department of Oceanography, Tallahassee, FL 32306-4320, United States
AB: Scaling biogeochemical processes across complex regional landscapes remains one of the most important challenges for deciphering the global methane cycle. For the past 30 years we have investigated the coupling of climate, groundwater, and methane cycling in the Glacial Lake Agassiz peatlands in northern Minnesota. Periodic droughts perturb the local and regional groundwater flow systems in this region altering the transport of inorganic solutes, organic acids and labile carbon substrates within the thick peat deposits. Two instrument stations at the bog crest and fen water track in the Red Lake peatland showed that large volumes of free-phase gas are trapped under confining layers in the deeper peat that episodically rupture to release large masses of methane bubbles to the atmosphere. These ebullition events are marked by abrupt depressuring cycles at depth and also by significant vertical and horizontal displacements of the peat surface. In the most recent phase of our investigations an integrated set of GPS stations and instrumented piezometers were installed to continuously pinpoint the location and calculate the magnitude of methane ebullition across a 160 square kilometer bog complex. The similarity of the vegetation patterns in this large bog complex to those found in other large peat basins in North America facilitates the transfer of these regional-scale ebullition fluxes to a broad swath of boreal America.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 1631 Land/atmosphere interactions (1218, 1843, 3322)
DE: 1813 Eco-hydrology
DE: 1829 Groundwater hydrology
DE: 1895 Instruments and techniques: monitoring
SC: Biogeosciences [B]
MN: 2007 Fall Meeting