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首页> 外文期刊>Environmental Science & Technology >α-Pinene Oxidation in the Presence of Seed Aerosol: Estimates of Nucleation Rates, Growth Rates, and Yield
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α-Pinene Oxidation in the Presence of Seed Aerosol: Estimates of Nucleation Rates, Growth Rates, and Yield

机译：种子气溶胶存在下的α-P烯氧化：成核速率，生长速率和产率的估计

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摘要

A recently developed inverse-modeling procedure has been applied to a case study of particle nucleation and growth following α-pinene and SO_2 oxidation in a smog chamber. With the use of only the measured aerosol size distributions as input, the condensational growth rate is obtained by regression analysis of the general dynamic equation, taking into account coagulation and wall losses. The growth rate provides an indirect measure of the concentration of the condensing species, offset by their vapor pressures. Assuming a particle density of 1.0 g cm~(-3), an aerosol yield of 7 ± 1% is obtained for an initial α-pinene concentration of 14 ppbv and a final organic aerosol mass of 4 μg m~3. Using the estimated vapor concentration, we show that the time-dependence of the yield is at least partly due to the time needed for condensation. Such a kinetic limitation to secondary organic aerosol formation may have implications for our understanding of gas-particle partitioning. The measured size distributions are also used to determine the empirical nucleation rate; itappears to be enhanced by the presence of organics.
机译：最近开发的逆模型程序已应用于烟雾室中α-pine烯和SO_2氧化后粒子成核和生长的案例研究。仅使用测得的气溶胶粒径分布作为输入，通过对一般动态方程进行回归分析，并考虑到凝结和壁面损失，即可得出凝结的增长率。增长率提供了一种间接测量冷凝物质浓度的方法，该浓度被其蒸气压所抵消。假设颗粒密度为1.0 g cm〜（-3），则初始α-pine烯浓度为14 ppbv，最终有机气溶胶质量为4μgm〜3时，气雾产率为7±1％。使用估计的蒸气浓度，我们表明产率的时间依赖性至少部分是由于冷凝所需的时间。这种对次生有机气溶胶形成的动力学限制可能对我们对气体颗粒分配的理解有影响。测得的尺寸分布也可用于确定经验成核率。似乎由于有机物的存在而增强。

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