The Influence of Halogen-Containing Oxidants in Sulfate Aerosol Formation in the Marine Boundary Layer

含卤素氧化剂对海洋边界层硫酸盐气溶胶形成的影响

• 批准号: 1343077
• 负责人: Becky Alexander
• 金额: $ 44.83万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-04-01 至 2018-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1343077&HistoricalAwards=false
• 关键词: Influence; Halogen; Containing; Oxidants; Sulfate

This research will test the hypothesis that halogen-containing oxidants (such as HOBr) play a significant role in sulfate aerosol formation in the marine boundary layer. Because HOBr and HOCl transfer unique isotopic signatures of oxygen to their oxidation products, the oxygen isotopic composition of the measured sulfate reflects the relative importance of the different mechanisms of oxidation. Measurements of Delta(17)Oxygen in sulfate, a value dependent only on the oxidation pathway of SO2 to sulfate, will be made on aerosol filter samples previously collected from nearly every major ocean basin. The global chemical transport model GEOS-Chem will be run for the days that the filter samples were collected. The modeled data for Delta(17)Oxygen will be compared with observations to provide constraints on the relative importance of hypohalous acid (HOX) in sulfate formation at each location.The results of this effort are important for understanding sulfate formation in the remote marine boundary layer. Sulfate is a major component of atmospheric aerosol and is especially important in the formation of new aerosol. This research is highly relevant for gaining a better understanding of cloud-aerosol chemistry and climate change.

这项研究将检验含卤素氧化剂（如HOBr）在海洋边界层硫酸盐气溶胶形成中发挥重要作用的假设。由于HOBr和HOCl将氧的独特同位素特征转移到其氧化产物中，因此所测量的硫酸盐的氧同位素组成反映了不同氧化机制的相对重要性。将对以前从几乎每个主要海洋盆地收集的气溶胶过滤器样品进行硫酸盐中δ（17）氧的测量，该值仅取决于SO2到硫酸盐的氧化途径。全球化学迁移模型GEOS-Chem将在收集过滤器样本的当天运行。Delta（17）氧的模拟数据将与观测数据进行比较，以提供次卤酸（HOX）在每个位置硫酸盐形成中的相对重要性的限制。硫酸盐是大气气溶胶的主要成分，在新气溶胶的形成中尤为重要。这项研究对于更好地了解云气溶胶化学和气候变化具有重要意义。