Career: Photochemical Oxidation of Dissolved Sulfur Dioxide and Other Sulfur (IV) Species in the Presence of Iron Organic Complexes in Atmospheric Waters

二氧化硫（SO2）的水相氧化是大气硫循环的重要组成部分。 大气中溶解态SO2被O2催化氧化被认为是形成硫酸盐的三条主要途径之一，然而目前大气模式中的铁催化氧化途径的参数化存在相当大的不确定性。 这个CAREER项目是在大气液体中存在铁和有机化合物的情况下对硫-IV物种的光化学氧化的调查。 本研究的目的是：1）测定两种真实大气沃茨中硫-IV的光化学氧化速率（例如雨、雾和云沃茨）和含有铁有机配合物的模拟系统（例如，亚铁、甘氨酸和亚铁络合物）2）检查其他有机污染物的影响（例如甲醛、乙醛、甲酸盐和乙酸盐）和过渡金属（例如Cu和Mn）对在Fe-有机络合物存在下溶解的SO2的光氧化的影响; 3）检查溶解的SO2对Fe-有机络合物的光化学循环的影响;以及4）评估在Fe-有机络合物存在下硫-IV的光化学氧化对大气液相中硫酸盐的总体形成的相对贡献。 该项目的教育部分涉及通过使用演示，实验室练习，实地研究和独立研究项目将大气水生光化学整合到教学计划中，

Aqueous-phase oxidation of sulfur dioxide (SO2) is an important component of the atmospheric sulfur cycle. The Fe-catalyzed oxidation of dissolved SO2 by O2 in clouds is considered one of the three major pathways for the formation of sulfate, however parameterization of the Fe-catalyzed oxidation pathway in atmospheric models currently involves considerable uncertainty. This CAREER project is an investigation of the photochemical oxidation of sulfur-IV species in the presence of iron and organic compounds in atmospheric liquids. The objectives of this study are to: 1) determine the photochemical oxidation rates of sulfur-IV in both authentic atmospheric waters (e.g. rain, fog, and cloud waters) and modeled systems containing iron-organo complexes (e.g. oxalato-, glyoxalato-, and pyruvato iron complexes) 2) examine the influence of other organic pollutants (e.g. formaldehyde, acetaldehyde, formate and acetate) and transition metals (e.g. Cu and Mn) on the photooxidation of dissolved S02 in the presence of Fe-organo complexes; 3) examine the effects of dissolved SO2 on the photochemical cycling of Fe-organo complexes; and 4) evaluate the relative contribution of photochemical oxidation of sulfur-IV in the presence of Fe-organo complexes to the overall formation of sulfate in atmospheric liquid phases. The educational component of this project involves the integration of atmospheric aquatic photochemistry into a teaching program by using demonstrations, laboratory exercises, field studies, and independent research projects,