Understanding the Contribution of Methanesulfonic Acid to New Particle Formation and Growth in the Troposphere

该项目的重点是研究大气中新粒子形成的特定途径。这条途径涉及甲磺酸（MSA）的反应，甲磺酸是一种广泛分布在对流层下部的化合物，在新粒子形成中可能比以前已知的更重要。 在预测新粒子形成方面的改进将提高我们更好地了解大气污染对人类健康和福祉的一些影响的能力，并提供帮助减轻这些影响的方法。（1）定量研究多官能胺的混合物与所选胺和NH3的混合物之间对新颗粒形成（NPF）的可能协同作用（2）研究了生物源挥发性有机物氧化产生的低挥发性高氧化性有机物在这些体系中的作用，（3）探讨了H_2SO_4与MSA之间的相互作用对NPF的影响。以及（4）将对机理的理解转化为大气模型。该项目将导致NPF速率的参数化，前体浓度结果将被纳入社区多尺度空气质量（CMAQ）空气质量模型，以更好地了解MSA在大气中的重要性。该奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估的支持。

This project is focused on investigating a specific pathway for the formation of new particles in the atmosphere. This pathway involves reactions of methanesulfonic acid (MSA), a compound that is widespread throughout the lower troposphere and one that may be more significant in new particle formation than previously known. Improvements in predicting new particle formation will enhance our ability to better understand a number of the effects of atmospheric pollution central to human health and welfare and provide ways to help mitigate these impacts.The major objectives of this project are to: (1) quantitatively investigate possible synergies between mixtures of multifunctional amines and mixtures of selected amines and NH3 on new particle formation (NPF) and growth from MSA reactions; (2) investigate the role of low volatility highly oxidized organics produced from the oxidation of biogenic volatile organic compounds on these systems; (3) probe interactions between H2SO4 and MSA for NPF; and (4) translate the mechanistic understanding into atmospheric models.This project will result in the parameterization of the rate of NPF as a function of precursor concentrations. The results will be incorporated into the Community Multiscale Air Quality (CMAQ) air quality model to better understand the importance of MSA in the atmosphere.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.