HR: 13:55h
AN: B13E-02 INVITED    [Abstracts]
TI: Relationships between Fire Radiative Energy, Fuel Combustion Rates, and Emission Rates of Trace Gases and PM2.5 in Laboratory Fires
AU: * Hao, W
EM: whao@fs.fed.us
AF: US Forest Service, RMRS Fire Sciences Laboratory, 5775 US Highway 10 West, Missoula, MT 59808, United States
AU: Freeborn, P H
EM: patrick.freeborn@kcl.ac.uk
AF: US Forest Service, RMRS Fire Sciences Laboratory, 5775 US Highway 10 West, Missoula, MT 59808, United States
AU: Freeborn, P H
EM: patrick.freeborn@kcl.ac.uk
AF: King's College London, Department of Geography, Strand, London, WC2R 2LS, United Kingdom
AU: Nordgren, B L
EM: bnordgren@fs.fed.us
AF: US Forest Service, RMRS Fire Sciences Laboratory, 5775 US Highway 10 West, Missoula, MT 59808, United States
AU: Baker, S P
EM: sbaker03@fs.fed.us
AF: US Forest Service, RMRS Fire Sciences Laboratory, 5775 US Highway 10 West, Missoula, MT 59808, United States
AU: Wold, C E
EM: cewold@fs.fed.us
AF: US Forest Service, RMRS Fire Sciences Laboratory, 5775 US Highway 10 West, Missoula, MT 59808, United States
AU: Wold, C E
EM: cewold@fs.fed.us
AF: University of Montana, College of Forestry and Conservation 32 Campus Drive, Missoula, MT 59812, United States
AU: Wooster, M J
EM: martin.wooster@kcl.ac.uk
AF: King's College London, Department of Geography, Strand, London, WC2R 2LS, United Kingdom
AB: The MODIS instruments on NASA Terra and Aqua satellites have provided a unique opportunity of measuring fire radiative energy (FRE) with a 1-km x 1-km resolution globally four times every day. The FRE of a fire is affected by meteorology, vegetation types and conditions, and topography. We conducted a series of laboratory experiments to measure simultaneously FRE and emissions of trace gases and PM 2.5 during the combustion of 44 vegetation fires. The dependence of FRE measurements on the instrument viewing angles was also investigated. The vegetation burned included ponderosa pine needles and branches, Douglas-fir twigs and foliage, western white pine needles, sagebrush, and Zambian savanna grass. The results showed that radiative energy accounted for about 12 percent of the total heat released during the fires. The instantaneous fuel weight loss and emissions of CO2, CO, NO and PM2.5 are linearly correlated with the instantaneous FRE release. However, the linear relationships vary considerably for different combustion phases (flaming or smoldering) and fuel types. We also calculated the integrated emission ratios of CO2, CO, NO or PM2.5 to FRE for each experiment. The emission ratios, in combination with the MODIS-derived fire radiative energy, can be used to estimate the amount of trace gases and aerosol particles emitted by fires during the 10-minute satellite overpass time.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0428 Carbon cycling (4806)
DE: 0480 Remote sensing
SC: Biogeosciences [B]
MN: 2007 Fall Meeting