ACE-ASIA Surface: Jeju(Cheju)_Mtn Aerosol Single Particle Mass Spectrometer (Zelenyuk/Imre) This dataset contains a single zipped text file. Each line contains an individual particle's information: timestamp (200104140915352000 - 2001-year, 04-month, 14-day, 09:15:35:200 h:min:sec:msec), particle aerodynamic diameter and mass spectrum (integrated intensities of peaks with m/z ratio from 1 to 350) for ~830,000 particles analyzed during period 04/12/2001 to 04/28/2001. The size of the unzipped file is ~ 800 Mb.