Impact of turbulent mixing on isoprene chemistry
Impact of turbulent mixing on isoprene chemistry
复制标题
湍流混合对异戊二烯化学的影响
DOI：
10.1002/2016gl069752
复制
发表时间：
2016
影响因子：
5.2
通讯作者：
M. Trainer
中科院分区：
文献类型：
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作者：
S.‐W. Kim;M. Barth;M. Trainer
异戊二烯是一种挥发性有机化合物，主要由树木排放，在白天迅速与羟基自由基（OH）反应，随后在对流层形成臭氧和气溶胶。异戊二烯-OH反应可能受到化学和混合之间相互作用的影响，因为这两个过程发生在相似的时间尺度上。我们研究了湍流混合对异戊二烯-OH反应性的影响，大涡模拟（LES）结合综合化学。我们的研究结果表明，异戊二烯和OH的协方差的原因~20%降低~10%的水平平均反应速率的增加，取决于氮氧化物（NOx = NO + NO2）的丰度，相比，忽略协方差的速率。这种对反应速率的广泛影响是由每个NOx体系中OH的主要产生和损失反应引起的。我们的研究促进了LES的使用，以更好地理解湍流在异戊二烯-OH反应中的作用和大规模模型中的参数化。
Isoprene, a volatile organic compound that is mainly emitted from trees, rapidly reacts with hydroxyl radical (OH) during daytime and subsequently forms ozone and aerosols in the troposphere. The isoprene‐OH reaction can be affected by the interplay between chemistry and mixing because the two processes occur at a similar time scale. We investigate the impact of turbulent mixing on isoprene‐OH reactivity with large eddy simulations (LES) coupled with comprehensive chemistry. Our results show that the covariance of isoprene and OH causes ~20% decrease to ~10% increase of the horizontal average reaction rate, depending on nitrogen oxides (NOx = NO + NO2) abundances, compared to the rate that neglects the covariance. This wide range of effects on reaction rates is caused by the primary production and loss reactions of OH in each NOx regime. Our research promotes the use of LES for better understanding the role of turbulence in isoprene‐OH reaction and parameterizations in large‐scale models.