The influence of biomass burning on the global distribution of selected non-methane organic compounds
The influence of biomass burning on the global distribution of selected non-methane organic compounds
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DOI：
10.5194/acp-13-851-2013
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发表时间：
2013-01-01
影响因子：
6.3
通讯作者：
Parrington, M.
中科院分区：
文献类型：
--
作者：
Lewis, A. C.;Evans, M. J.;Parrington, M.
森林火灾是大气中化学物质的重要来源，包括许多非甲烷有机化合物（NMOCs）。我们报告了从加拿大东部收集的500多个完整空气样本中对碳氢化合物、丙酮和甲醇的空气测量，包括对几种不同的北方生物质燃烧羽流的拦截。从这些和同时测量的一氧化碳（CO），我们得出的火灾排放率为29种不同的有机物种相对于CO的排放量。这些范围从8.9 +/- 3.2 ppt ppb（-1）CO的甲醇到0.007 +/- 0.004 ppt ppb（-1）CO的环戊烷。该比值与文献值吻合良好至极好。使用GEOS-Chem全球3-D化学传输模型（CTM），我们显示了生物质燃烧对苯，甲苯，乙烯和丙烯的全球分布的影响（这些物种被控制用于空气质量的目的，有时被用作人类活动的指示性示踪剂）。使用我们的观测得出的排放比率和GEOS-Chem CTM，我们表明，生物质燃烧可以是最大的部分贡献者观测到的苯，甲苯，乙烯和丙烯水平在许多全球位置。广泛的生物质燃烧对大气苯（一种受到严格管制的空气污染物）的贡献表明，随着发达国家尾气和溶剂排放量的下降，在制定空气质量目标时需要采取务实的方法。随后，我们确定了28个世界气象组织全球大气监测站受生物质燃烧来源的苯，甲苯，乙烯和丙烯的影响程度，与其暴露于人为排放相比。
Forests fires are a significant source of chemicals to the atmosphere including numerous non-methane organic compounds (NMOCs). We report airborne measurement of hydrocarbons, acetone and methanol from > 500 whole air samples collected over Eastern Canada, including interceptions of several different boreal biomass burning plumes. From these and concurrent measurements of carbon monoxide (CO) we derive fire emission ratios for 29 different organic species relative to the emission of CO. These range from 8.9 +/- 3.2 ppt ppb(-1) CO for methanol to 0.007 +/- 0.004 ppt ppb(-1) CO for cyclopentane. The ratios are in good to excellent agreement with literature values. Using the GEOS-Chem global 3-D chemical transport model (CTM) we show the influence of biomass burning on the global distributions of benzene, toluene, ethene and propene (species which are controlled for air quality purposes and sometimes used as indicative tracers of anthropogenic activity). Using our observationally derived emission ratios and the GEOS-Chem CTM, we show that biomass burning can be the largest fractional contributor to observed benzene, toluene, ethene and propene levels in many global locations. The widespread biomass burning contribution to atmospheric benzene, a heavily regulated air pollutant, suggests that pragmatic approaches are needed when setting air quality targets as tailpipe and solvent emissions decline in developed countries. We subsequently determine the extent to which the 28 global-status World Meteorological Organisation - Global Atmosphere Watch stations worldwide are influenced by biomass burning sourced benzene, toluene, ethene and propene as compared to their exposure to anthropogenic emissions.