Direct measurement of particle formation and growth from the oxidation of biogenic emissions
Direct measurement of particle formation and growth from the oxidation of biogenic emissions
复制标题
直接测量生物排放物氧化产生的颗粒形成和生长
DOI：
10.5194/acp-6-4403-2006
复制
发表时间：
2006
影响因子：
6.3
通讯作者：
J. Smith
中科院分区：
文献类型：
--
作者：
T. VanReken;J. Greenberg;P. Harley;A. Guenther;J. Smith
一种新的装置已经被开发出来，用于研究植物排放的挥发性有机化合物氧化形成新颗粒的过程。该设施包括一个生物源排放封闭室、一个气溶胶生长室和相关仪器。使用该设施，新的粒子形成事件已诱导通过臭氧与三种不同的前体气体混合物的反应：an -pinene测试混合物和排放的霍尔姆橡树（栎冬青）标本和火炬松（火炬松）标本。结果表明，物种之间的变异性，在他们的潜力，以形成新的气溶胶产品。Q. ILEX样品产生的颗粒比D-pinene少，尽管在加入臭氧之前两个实验中单萜的浓度大致相等。相反，氧化的P. taeda标本排放导致形成更多的颗粒比其他两种气体混合物，尽管较低的初始萜类化合物浓度。这些变化可以归因于植物排放物的物种形成与β-蒎烯混合物和彼此之间的差异。具体地说，α-蒎烯和其他反应较慢的单萜的存在可能抑制了Q中颗粒的形成。冬青实验，而存在的倍半萜，包括-carbellene，在排放的P. taeda标本是可能的原因，在该实验期间观察到的更强烈的颗粒形成事件。
A new facility has been developed to investi- gate the formation of new particles from the oxidation of volatile organic compounds emitted from vegetation. The fa- cility consists of a biogenic emissions enclosure, an aerosol growth chamber, and the associated instrumentation. Using the facility, new particle formation events have been induced through the reaction of ozone with three different precursor gas mixtures: an -pinene test mixture and the emissions of a Holm oak (Quercus ilex) specimen and a loblolly pine (Pinus taeda) specimen. The results demonstrate the variability be- tween species in their potential to form new aerosol products. The emissions of Q. ilex specimen resulted in fewer particles than did -pinene, although the concentration of monoter- penes was roughly equal in both experiments before the addi- tion of ozone. Conversely, the oxidation of P. taeda specimen emissions led to the formation of more particles than either of the other two gas mixtures, despite a lower initial terpenoid concentration. These variations can be attributed to differ- ences in the speciation of the vegetative emissions with re- spect to the -pinene mixture and to each other. Specifically, the presence of -pinene and other slower-reacting monoter- penes probably inhibited particle formation in the Q. ilex experiment, while the presence of sesquiterpenes, including -caryophyllene, in the emissions of the P. taeda specimen were the likely cause of the more intense particle formation events observed during that experiment.