This study discussed the contribution of new particle formation (NPF) events to the number concentrations of cloud condensation nuclei (CCN) based on aerosol number size distributions measured at the summit of Mt. Fuji. The observations were made during the summer months of 2014〜2019. The size distribution is measured by a scanning mobility particle sizer (SMPS), and the CCN number concentration is estimated by the number concentration of particles larger than 80 nm (N80). At the summit of Mt. Fuji, the event occurred 113 times and the increase of N80 was recorded 60 times out of 217 days of analysis. The N80 increased by 47 to 234 cm-3 due to NPFs, and the increase rate was 123 to 302%. By comparing the diurnal variation of N80 on days with and without NPF events, it was confirmed that the events increased N80. At the summit of Mt. Fuji, the increase in N80 due to NPF was small compared to some other stations, but the rate of increase was relatively high. Mode diameters grew to 80 nm in 7 of 113 events. The concentration of increase in N80 is 9 to 552 cm-3, the increase rate is 111 to 700%. The growth period from 25 nm to 80 nm was about 2 to 12 hours, and the growth rate was about 5 to 30 nm h-1. The growth characteristics depended on the particle number concentration produced by the NPF, the origin and transport route of air mass, the existing particle number concentration of N80, the precursor gas concentration, and the chemical composition of the aerosol.
|Translated title of the contribution||Growth of New Particles into Cloud Condensation Nuclei at the Summit of Mt. Fuji during Summer|
|Number of pages||10|
|Publication status||Published - 2022|
ASJC Scopus subject areas
- Environmental Chemistry
- Materials Science (miscellaneous)
- Environmental Science (miscellaneous)