HR: 0800h
AN: B21C-0897    [Abstracts]
TI: Hydrologic and Climatic Controls on the Export of Dissolved Organic Carbon from Beverly Swamp
AU: * Bourbonniere, R A
EM: rick.bourbon@ec.gc.ca
AF: Environment Canada, National Water Research Institute, P.O. Box 5050, Burlington, ON L7R 4A6 Canada
AU: Edmondson, K
EM: karen.edmondson@ec.gc.ca
AF: Environment Canada, National Water Research Institute, P.O. Box 5050, Burlington, ON L7R 4A6 Canada
AU: Dunnett, F
EM: frank.dunnett@ec.gc.ca
AF: Environment Canada, National Water Research Institute, P.O. Box 5050, Burlington, ON L7R 4A6 Canada
AU: Waddington, J M
EM: wadding@mcmaster.ca
AF: McMaster University, School of Geography & Geology, 1280 Main Street West, Hamilton, ON L8S 4L8 Canada
AU: Branfireun, B
EM: brian.branfireun@utoronto.ca
AF: University of Toronto, Department of Geography, 3359 Mississauga Road North, Mississauga, ON L5L 1C6 Canada
AB: Utilizing a seven-year record this study examines how dissolved organic matter (DOM) dynamics relate to hydrological processes and climatological variability in Beverly Swamp - a forested cedar and hardwood peatland located in southern Ontario. The swamp contains two sub-catchments drained by streams that exhibit different hydrological regimes, one an unconfined stream with a high degree of interaction with the peatland and the other a confined stream with little interaction. These hydrological characteristics, combined with inter-annual and seasonal climate variability, provide the variety of conditions that allow the examination of DOM dynamics in the swamp environment. A mass balance approach is used to characterize the retention and export of dissolved organic carbon (DOC) from the sub-catchments and the entire swamp. The DOC budget results from combining stream discharge and precipitation measurements with their DOC concentrations. Comparison of the DOC budget for the ice-free periods from 1998 through 2004 reveals differences in export of DOC from the sub-catchments tied to the stream's hydrologic regime. Inter-annual and seasonal variations in the characteristics of DOC export relate to differences in seasonal distribution of precipitation and to drought-flood cycles.
DE: 1836 Hydrologic budget (1655)
DE: 1871 Surface water quality
DE: 1890 Wetlands
DE: 1055 Organic geochemistry
DE: 1615 Biogeochemical processes (4805)
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting