海洋生物起源の硫酸エアロゾル生成過程

抄録

The oxidation of the marine biogenic dimethyl sulfide (DMS) in the atmosphere is a key process for the formation of sulfate aerosols that influence cloud properties and thus climate by serving as cloud condensation nuclei (CCN). This process has been poorly represented in global-scale atmospheric models, possibly contributing to a large low bias in CCN number concentrations recently highlighted in the clean remote marine troposphere such as the tropics and the summertime Southern Ocean. Understanding the processes controlling CCN in those “preindustrial-like” pristine environments is of critical importance for constraining the anthropogenic radiative forcing from the aerosol-cloud interaction. These backgrounds have stimulated the significant development in the understanding of DMS oxidation processes, including the recent discoveries of overlooked intermediates and reaction pathways. This paper synthesizes the recent findings in DMS oxidation processes and their subsequent role in CCN formation, mainly from the perspective of their representation in global-scale models but with feedback to the observational and laboratory works.