Collaborative Research: Atmospheric Mixed Phase Chemistry for Improved Climate Predictions: Field Measurements and Modeling of the Southern Oxidant and Aerosol Study

该项目将调查与自然排放的生物挥发性有机化合物(BVOCs)相关的过程，这些过程导致二次有机气溶胶(SOA)的形成。特别令人感兴趣的是对来自BVOC氧化的有机化合物的评估，这些有机化合物是水溶性的，具有CCN活性，并且在受控的实验室实验中很容易与OH自由基反应，以产生低挥发性产物，这些产物可能通过多相有机化学形成二次气溶胶。在2013年夏天将在阿拉巴马州森特维尔附近进行的南方氧化剂和气溶胶研究(SOAS)期间，将对SOA的化学和物理性质进行连续测量。这项研究将集中在颗粒相、液态水和颗粒pH值在确定SOA质量中的作用。将对这些数据进行分析，以阐明生物排放和人为排放之间的多相化学联系，并估计多相途径对SOA的贡献程度。这项研究是必要的，以增进对当地和全球气候和空气质量的了解。这些结果可能有助于解释东南部地区的异常气温趋势是否源于生物和人为排放之间的相互作用，这些排放可以通过形成次级有机气溶胶来影响区域气候。东南部地区并没有像其他地区那样对全球气候变化做出反应。在实地活动期间，将有许多支持科学传播和教育的活动。

This project will investigate processes associated with the natural emissions of biogenic volatile organic compounds (BVOCs) that lead to the formation of secondary organic aerosol (SOA). Of particular interest is the assessment of organic compounds derived from BVOC oxidation that are water-soluble, CCN-active and react readily with the OH radical in controlled laboratory experiments to create low-volatility products that may form secondary aerosol via multiphase organic chemistry. Continuous measurements of SOA chemical and physical properties will be made during the Southern Oxidant and Aerosol Study (SOAS) to be conducted near Centreville Alabama in the summer of 2013. This study will focus on the role of particle phase liquid water and particle pH in determining SOA mass. The data will be analyzed to elucidate the linkages between bio- and anthropogenic emissions on multiphase chemistry, and estimate the magnitude of the contribution of multiphase pathways to SOA.This research is needed in order to improve understanding of local and global climate and air quality. The results may help explain whether the anomalous temperature trend in the Southeast, which has not warmed like other regions in response to global climate change, is due to interactions among biogenic and anthropogenic emissions that can affect regional climate through formation of secondary organic aerosol. During the field campaign, there will be many activities supporting science communication and education.