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Effect of NO_x on Secondary Organic Aerosol Concentrations

机译：NO_x对次要有机气溶胶浓度的影响

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The secondary organic aerosol (SOA) module in PMCAMx, a three-dimensional chemical transport model, has been updated to incorporate NO_x-dependent SOA yields. Under low-NO_x conditions, the RO_2 radicals react with other peroxy radicals to form a distribution of products with lower volatilities, resulting in higher SOA yields. At high-NO_x conditions, the SOA yields are lower because aldehydes, ketones, and nitrates dominate the product distribution. Based on recent laboratory smog chamber experiments, high-NO_x SOA parametrizations were created using the volatility basis-set approach. The organic aerosol (OA) concentrations in the Eastern US are simulated for a summer episode, and are compared to the available ambient measurements. Changes in NO* levels result in changes of both the oxidants (ozone, OH radical, etc.) and the SOA yields during the oxidation of the corresponding organic vapors. The NO_x dependent SOA parametrization predicts a maximum average SOA concentration of 5.2 μg m~(-3) and a domain average concentration of 0.6 μg m~(-3). As the NO_x emissions are reduced by 25%, the domain average SOA concentration does not significantly change, but the response is quite variable spatially. However, the predicted average SOA concentrations increase in northern US cities by around 3% but decrease in the rural southeast US by approximately 5%. A decrease of the average biogenic SOA by roughly 0.5 μg m~(-3) is predicted for the southeast US for a 50% reduction in NO_x emissions.
机译：PMCAMx中的次要有机气溶胶（SOA）模块（一种三维化学传输模型）已更新，以包含依赖于NO_x的SOA产量。在低NO_x条件下，RO_2自由基与其他过氧自由基反应形成挥发性较低的产物分布，从而提高了SOA产量。在高NOxx条件下，SOA产量较低，因为醛，酮和硝酸盐主导了产品分布。根据最近的实验室烟雾室实验，使用挥发性基础集方法创建了高NO_x SOA参数。模拟了美国东部夏季的有机气溶胶（OA）浓度，并将其与可用的环境测量值进行了比较。 NO *含量的变化会导致相应有机蒸气氧化过程中氧化剂（臭氧，OH自由基等）和SOA收率的变化。 NO_x依赖性SOA参数化预测最大平均SOA浓度为5.2μgm〜（-3），畴平均浓度为0.6μgm〜（-3）。由于NO_x排放量减少了25％，域平均SOA浓度不会显着变化，但是响应在空间上变化很大。但是，预测的平均SOA浓度在美国北部城市增加了约3％，但在美国东南部农村地区却减少了约5％。预测美国东南部的平均生物成因SOA降低约0.5μgm〜（-3），从而将NO_x排放降低50％。

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