Sea-Salt Aqueous Phase SO2 Oxidation: Contribution to Marine Boundary Layer (MBL) Sulfur Budgets

该项目的重点是确定海盐气溶胶中硫的氧化对远程海洋边界层大气硫收支的贡献。为了将这一过程与云处理区分开来，将在新西兰的Baring Head收集气溶胶样本，该地点经常观察到持续无云的条件。将进行大量气溶胶离子组成以及单个粒子元素测量。将开发一种技术来确定环境海盐气溶胶的大小依赖的缓冲能力。据推测，这种缓冲能力是高于散装海水，因为在表面微层中的生物碳酸钙的存在。较高的缓冲能力会影响臭氧对二氧化硫的高度pH依赖性氧化，导致氧化增加。

The focus of this project is to determine the contribution of the oxidation of sulfur in sea salt aerosols to the atmospheric sulfur budget in the remote marine boundary layer. In order to distinguish this process from cloud processing, aerosol samples will be collected at Baring Head, New Zealand - a site where persistent cloud-free conditions are frequently observed. Bulk aerosol ion composition as well as individual particle elemental measurements will be performed. A technique will be developed to determine the size-dependent buffering capacity of ambient sea salt aerosols. It is hypothesized that this buffering capacity is higher than that of bulk seawater because of the presence of biogenic calcium carbonate in the surface microlayer. A higher buffering capacity would affect the highly pH-dependent oxidation of sulfur dioxide by ozone, leading to increased oxidation.