Particle emissions from laboratory combustion of wildland fuels:: In situ optical and mass measurements
Particle emissions from laboratory combustion of wildland fuels:: In situ optical and mass measurements
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DOI：
10.1029/2005gl024838
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发表时间：
2006-02-21
影响因子：
5.2
通讯作者：
Watson, JG
中科院分区：
文献类型：
--
作者：
Chen, LWA;Moosmüller, H;Watson, JG
采用腔衰荡/腔增强探测(CRD/CED)消光和双波长光声吸收探测等先进技术，首次测定了中纬度荒野燃料受控燃烧产生的烟雾颗粒的时间分辨光学性质。该实验很好地解决了烟度对燃料和燃烧阶段的依赖关系。黄松木材(PPW)燃烧过程中产生的颗粒单次散射反照率为0.32，比消光系数为8.9m(2)g(-1)。燃烧白松针(WPN)的特点是阴燃阶段延长，发出的颗粒不吸收光，而且看起来更大，消光效率约为5m(2)g(-1)。建立了Mie散射模型，估算了PPW和WPN烟雾颗粒中的黑碳含量分别为66%和12%。这些观测可能会完善目前对生物质燃烧排放的辐射强迫估计。
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.