Particle emissions from laboratory combustion of wildland fuels:: In situ optical and mass measurements

被引:47
作者
Chen, LWA [1 ]
Moosmüller, H
Arnott, WP
Chow, JC
Watson, JG
机构
[1] Univ Nevada, Desert Res Inst, Div Atmospher Sci, Reno, NV 89512 USA
[2] USDA, Fire Sci Lab, Rocky Mt Res Stn, Forest Serv, Missoula, MT 59807 USA
关键词
D O I
10.1029/2005GL024838
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Time-resolved optical properties of smoke particles from the controlled laboratory combustion of mid-latitude wildland fuels were determined for the first time using advanced techniques, including cavity ring-down/cavity enhanced detection (CRD/CED) for light extinction and two-wavelength photoacoustic detection for light absorption. This experiment clearly resolves the dependence of smoke properties on fuel and combustion phase. Intensive flaming combustion during ponderosa pine wood (PPW) burning produces particles with a low single scattering albedo of 0.32 and a specific mass extinction efficiency of 8.9 m(2) g(-1). Burning white pine needles (WPN) features a prolonged smoldering phase emitting particles that are not light-absorbing and appear much larger in size with an extinction efficiency approximate to 5 m(2) g(-1). A Mie scattering model was formulated, which estimates the black carbon fraction in the PPW and WPN smoke particles at 66% and 12%, respectively. These observations may refine the current radiative forcing estimates for biomass burning emissions.
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页数:4
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