Organic aerosol emission ratios from the laboratory combustion of biomass fuels
Organic aerosol emission ratios from the laboratory combustion of biomass fuels
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生物质燃料实验室燃烧的有机气溶胶排放率
DOI：
10.1002/2014jd021589
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Jolleys M
中科院分区：
文献类型：
--
作者：
Jolleys M
在密苏拉第二火灾实验室的实验中，对67个烧伤的有机气溶胶(OA)排放比(ER)进行了表征。这些火灾涉及19种不同的物种，代表6种主要燃料，每一种都构成了美国生物质燃烧清单的重要组成部分。平均归一化ΔOA/ΔCO比值在不同燃料类型和物种之间和内部都显示出高度的变异性，通常超过环境测量中不同羽流之间的差异。这种可变性受到烧伤之间高度对比的ΔOA水平的强烈影响，以及在高ΔOA浓度下半挥发性有机化合物向颗粒相的分配增加。在所有火灾中，ΔOA/ΔCO和修正燃烧效率之间没有相关性，后者是燃烧和阴燃燃烧阶段在每一次燃烧过程中所占比例的指标。然而，对于一些针叶树种，最显著的是道格拉斯冷杉，与木材含水率呈负相关，这也受燃料水分含量的影响。火力效率的变化也显示出极大地改变了初始条件非常相似的火灾的排放。尽管与MCE的关系在不同物种之间是不同的，但与OA的氧合水平有更大的一致性。气溶胶质谱仪测量的Δ/z44碎片与总的OA质量浓度(F44)的比值提供了一个在源头上受燃烧过程影响的氧合的指示，对于所有燃料类型，随着f44的增加，OMA/ΔCO减少。与每种对ΔOA/ΔCO的潜在影响相关的影响的大小不一致，强调了缺乏对火灾排放的单一主导控制，并依赖于燃料特性和燃烧条件。
Organic aerosol (OA) emission ratios (ER) have been characterized for 67 burns during the second Fire Laboratory at Missoula Experiment. These fires involved 19 different species representing 6 major fuels, each of which forms an important contribution to the U.S. biomass burning inventory. Average normalized ΔOA/ΔCO ratios show a high degree of variability, both between and within different fuel types and species, typically exceeding differen‐ces between separate plumes in ambient measurements. This variability is strongly influenced by highly contrasting ΔOA levels between burns and the increased partitioning of semivolatile organic compounds to the particle phase at high ΔOA concentrations. No correlation across all fires was observed between ΔOA/ΔCO and modified combustion efficiency (MCE), which acts as an indicator of the proportional contributions of flaming and smoldering combustion phases throughout each burn. However, a negative correlation exists with MCE for some coniferous species, most notably Douglas fir, for which there is also an influence from fuel moisture content. Changes in fire efficiency were also shown to dramatically alter emissions for fires with very similar initial conditions. Although the relationship with MCE is variable between species, there is greater consistency with the level of oxygenation in OA. The ratio of them/z44 fragment to total OA mass concentration (f44) as measured by aerosol mass spectrometer provides an indication of oxygenation as influenced by combustion processes at source, with ΔOA/ΔCO decreasing with increasingf44for all fuel types. Inconsistencies in the magnitude of the effects associated with each potential influence on ΔOA/ΔCO emphasize the lack of a single dominant control on fire emissions, and a dependency on both fuel properties and combustion conditions.
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墨西哥盆地的森林：类型、地理分布和状况
DOI：
--
发表时间：
2002
期刊：
影响因子：
--
作者：
C. Rodríguez
通讯作者：
C. Rodríguez
影响因子：
6.3
作者：
Fuzzi, S.;Andreae, M. O.;Poeschl, U.
通讯作者：
Poeschl, U.
影响因子：
4.4
作者：
Capes, G.;Johnson, B.;Coe, H.
通讯作者：
Coe, H.
影响因子：
4.4
作者：
Ferek, RJ;Reid, JS;Liousse, C
通讯作者：
Liousse, C
影响因子：
6.3
作者：
Burling, I. R.;Yokelson, R. J.;Weise, D. R.
通讯作者：
Weise, D. R.