Chemical/elemental compositions and particle type classifications of fine mode aerosols over the Northwestern Pacific Ocean

Aerosols have substantial impacts on climate change and marine ecosystems over the northwestern Pacific Ocean (NWPO); however, their spatiotemporal variability and characteristics have not been sufficiently characterized especially in the East Asian winter monsoon. The compositions and physical parameters of fine-mode aerosols over the NWPO were investigated during a cruise on the research vessel Mirai in the late winter and early spring of 2021. Ship-based high-temporal resolution observations and laboratory analyses of aerosol number concentrations and chemical and elemental compositions revealed the diverse sources and transport processes significantly affecting the behavior of fine-mode aerosol particles in the marine boundary layer (MBL) over the NWPO (Miyakawa et al., PEPS, 2025, https://doi.org/10.1186/s40645-025-00752-0). This data set, which was used in Miyakawa et al. (2025), includes the 2-hourly temporal variations in elemental compositions of submicron aerosols (Si, S, Cl, K, Ca, Ti, Mn, Fe, Cu, Zn, and Pb) and refractory black carbon (rBC) mass concentrations measured using an automated aerosol elemental analyzer (PX-375) and a single particle soot photometer (SP2), respectively, chemical compositions of fine mode (PM2.5) aerosols (water soluble inorganic ions and carbonaceous aerosols) based on offline chemical analyses, and particle types classified by the individual particle analyses using a transmission electron microscopy (TEM).