title: Secondary production of organic aerosols from biogenic VOCs over Mt. Fuji, Japan.
abstract: We investigated organic molecular compositions of summertime aerosols collected at the summit of Mt. Fuji (3776 m a.s.l.) in July-August 2009. More than 120 organic species were identified using GC/MS. Concentrations of both primary and secondary organic aerosol (SOA) tracers in whole-day samples were 4-20 times higher than those in nighttime samples, suggesting that valley breeze is an efficient mechanism to uplift the aerosols and precursors from the ground surface to mountaintop in daytime. Using a tracer-based method, we estimated the concentrations of secondary organic carbon (SOC) derived from isoprene, α/β-pinene, and β-caryophyllene to be 2.2-51.2 ngC m(-3) in nighttime and 227-1120 ngC m(-3) during whole-day. These biogenic SOCs correspond to 0.80-31.9% and 26.8-57.4% of aerosol organic carbon in nighttime and whole-day samples, respectively. This study demonstrates that biogenic SOA, which is controlled by the valley breeze, is a significant fraction of free tropospheric aerosols over Mt. Fuji in summer.
authors.affiliation: Institute of Low Temperature Science, Hokkaido University , Sapporo 060-0819, Japan.
authors.forename: Pingqing
authors.initials: P
authors.lastname: Fu
authors.forename: Kimitaka
authors.initials: K
authors.lastname: Kawamura
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
authors.forename: Yuzo
authors.initials: Y
authors.lastname: Miyazaki
mesh_terms: D000336:Aerosols; D000393:Air Pollutants / Q000032:analysis*; D004784:Environmental Monitoring; D007564:Japan; D012621:Seasons; D013729:Terpenes / Q000032:analysis*
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D013729:Terpenes