HR: 14:50h
AN: B23B-05    [Abstracts]
TI: Carbon Source and Sink Distribution in Canada's Forests and Wetlands Based on Remote Sensing, Forest Inventory, Large Fire Polygons, Drainage Class, Topography, and Climate
AU: * Chen, J M
EM: chenj@geog.utoronto.ca
AF: University of Toronto, Department of Geography 100 St. George St., Room 5047, Toronto, ONT M5S 3G3 Canada
AU: Ju, W
EM: juw@geog.utoronto.ca
AF: University of Toronto, Department of Geography 100 St. George St., Room 5047, Toronto, ONT M5S 3G3 Canada
AB: Based on our previous work (Chen et al., 2003, Tellus B. 55(2): 622-642) on the carbon source and sink distribution in Canada's forests using Canada-wide data from remote sensing, forest inventory, large fire polygons for the last 50 years, soil texture and carbon data, nitrogen deposition measurements in 29 locations, and monthly gridded climate from 1901 to 1998, we here include the carbon balance of wetland areas estimated using additional data on the drainage class and digital terrain model. A simple TOPMODEL is used to model the water balance of wetland areas over last 100 years at 1 km resolution. The inclusion of wetland areas increases the carbon sink by about 25 MtC per year as wetlands have been carbon sinks in most years of the last century when methane is not included. As biomass data in inventory are missing over the northern part of boreal forests and soil carbon data are incomplete in many regions, intensive work is conducted to test model abilities to simulate these carbon pools against available data and then use the model to produce the complete coverages. The RMSE in estimated soil carbon in 2000 polygons with complete data reduced from 40 KgC m$^-2$ to 28 KgC m$^-2$ when wetland carbon accumulation processes are considered.
DE: 1030 Geochemical cycles (0330)
DE: 1615 Biogeochemical processes (4805)
DE: 1640 Remote sensing
DE: 0315 Biosphere/atmosphere interactions
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting