Is secondary organic aerosol yield governed by kinetic factors rather than equilibrium partitioning?†,Environmental Science: Processes & Impacts

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Is secondary organic aerosol yield governed by kinetic factors rather than equilibrium partitioning?†
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2017-12-12 00:00:00 , DOI: 10.1039/c7em00451f
Chen Wang _{1,

2,

3,

4,

5} , Frank Wania _{1,

2,

3,

4,

5} , Kai-Uwe Goss _{6,

7,

8,

9,

10}

Affiliation

The numerical description of the formation of secondary organic aerosol (SOA) in the atmosphere relies on the use of particle yields, which are often determined in chamber experiments. What is sometimes not appreciated is that such yields (i) can be defined in different ways and (ii) depend on atmospheric conditions. Here we show with the help of hypothetical scenario simulations that the differential SOA yield upon addition of oxidation products to an atmosphere already containing such products and SOA is more relevant in the ambient atmosphere than the commonly used integrative yield from chamber studies. Furthermore, we suggest that the SOA formation scenarios that have been studied so far comprise merely a subset of possible atmospheric situations. In particular, while in the standard scenarios factors such as volatility and aerosol loading are important, scenarios can be envisaged where these factors become less important while the differential yield approaches unity for all oxidation products. Finally, we suggest aerosol growth in the atmosphere should be seen as being determined by a dynamic situation arising from many simultaneously occurring kinetic processes rather than a thermodynamic equilibrium process.

中文翻译：

次级有机气溶胶产量是否受动力学因素而不是平衡分配的支配？†

大气中次级有机气溶胶（SOA）形成的数值描述取决于颗粒产率的使用，而颗粒产率通常在室内实验中确定。有时不理解的是，这样的产量（i）可以以不同的方式定义，并且（ii）取决于大气条件。在这里，我们借助假设的情景模拟表明，将氧化产物添加到已经包含这种产物和SOA的气氛中后，SOA的产量差异与环境研究中常用的综合产量相比在环境大气中的相关性更高。此外，我们建议到目前为止已经研究过的SOA形成方案仅包括可能的大气情况的一个子集。尤其是，尽管在标准方案中，诸如挥发性和气溶胶载量等因素很重要，但可以设想以下方案：这些因素变得不那么重要，而所有氧化产物的差异收率趋于统一。最后，我们建议应该将大气中的气溶胶生长确定为由许多同时发生的动力学过程而非热力学平衡过程引起的动力学情况。

更新日期：2017-12-12

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