Covering more than 70% of the planet, aquatic environments are one of the most abundant sources of atmospheric aerosol. The sea spray aerosol (SSA), generated via wave breaking and bubble bursting, significantly impact radiative properties, chemical compositions, and biodiversity of the atmosphere. Depending on their size, morphology, and physiochemical properties, SSA particles serve as cloud condensation nuclei (CCN) and ice nucleating particles (INPs), provide a medium for heterogeneous reactions of oxidants and radicals, and transfer microbes and viruses to the atmosphere. This session welcomes theoretical, experimental, observational, biogeochemical, and modeling studies that improve our understanding of marine aerosols from molecular to global scale. In addition, studies focusing on the emerging field of freshwater aerosols and lake spray aerosol (LSA) are also welcome.