Sulfur Dioxide Modifies Aerosol Particle Formation and Growth by Ozonolysis of Monoterpenes and Isoprene
Sulfur Dioxide Modifies Aerosol Particle Formation and Growth by Ozonolysis of Monoterpenes and Isoprene
复制标题
DOI：
10.1029/2018jd030064
复制
发表时间：
2019-04
期刊：
影响因子：
--
通讯作者：
C. Stangl;J. Krasnomowitz;Michael J. Apsokardu;L. Tiszenkel;Ouyang Qi;Shan-Yuan Lee;M. Johnston
中科院分区：
文献类型：
--
作者：
C. Stangl;J. Krasnomowitz;Michael J. Apsokardu;L. Tiszenkel;Ouyang Qi;Shan-Yuan Lee;M. Johnston
在干燥条件下，在单分散硫酸铵种子颗粒和OH清除剂存在的条件下，研究了二氧化硫对臭氧分解α -蒎烯、β -蒎烯和柠檬烯三种单萜烯和异戊二烯颗粒形成和生长的影响。在没有二氧化硫的情况下，没有观察到新的颗粒形成，种子颗粒的生长与每一种有机前体产生的低挥发性氧化产物的冷凝一致。对于二氧化硫，每个前驱体都有新的颗粒形成，这与二氧化硫与稳定的Criegee中间体反应生成硫酸的情况一致。二氧化硫的存在对α -蒎烯和柠檬烯臭氧分解产生的种子颗粒的生长速率没有显著影响，尽管化学成分测量显示，在二氧化硫暴露后，颗粒中存在有机硫酸盐。相反，通过β -蒎烯和异戊二烯臭氧分解的种子的生长被二氧化硫大大促进，化学成分测量显示，这种增强的生长不是由于额外的有机物质，表明无机硫酸盐可能负责。结果表明，以前未被考虑的由二氧化硫激活的颗粒相生长途径可能会改变具有显著SO2 -烯烃相互作用区域的云凝结核的产生。
The effect of sulfur dioxide on particle formation and growth by ozonolysis of three monoterpenes (α‐pinene, β‐pinene, and limonene) and isoprene was investigated in the presence of monodisperse ammonium sulfate seed particles and an OH scavenger in a flow tube under dry conditions. Without sulfur dioxide, new particle formation was not observed, and seed particle growth was consistent with condensation of low‐volatility oxidation products produced from each organic precursor. With sulfur dioxide, new particle formation was observed from every precursor studied, consistent with sulfuric acid formation by reaction of sulfur dioxide with stabilized Criegee Intermediates. The presence of sulfur dioxide did not significantly affect seed particle growth rates from α‐pinene and limonene ozonolysis, although chemical composition measurements revealed the presence of organosulfates in the particles following SO2 exposure. Contrarily, the growth of seeds by β‐pinene and isoprene ozonolysis was considerably enhanced by sulfur dioxide, and chemical composition measurements revealed that the enhanced growth was not due to additional organic material, suggesting that inorganic sulfate was likely responsible. The results suggest that a previously unconsidered particle‐phase pathway to growth activated by sulfur dioxide may alter production of cloud condensation nuclei over regions with significant SO2‐alkene interactions.