Marine aerosols represent a major component of the earth climate system, yet it is poorly constrained and understood. Here in our group, we try to identify the source, atmospheric transformation and climate impact of marine aerosol. We try to parameterize the source function of sea spray aerosol and access its global abundance, and to explore the nucleation and growth mechanism of secondary marine aerosol. We also interested in studying the interaction between anthropogenic air pollution and natural aerosol in the marine boundary layer.