Measurement of Organic Aerosol Using a High-Resolution Aerosol Mass Spectrometer at a Forest Site in Jap
The physical and chemical properties of atmospheric aerosols were studied at a remote forest site, Wakayama, Japan, from 20 to 30 August, 2010. An Aerodyne high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) was deployed to measure non-refractory species in submicron particles, including sulphate, nitrate, ammonium and organics. The number-size distributions of aerosols were measured using a scanning mobility particle sizer (SMPS). The temporal variations of aerosol properties and the results from backward air mass trajectory analysis (HYSPLIT) suggests that aerosols in the first six days were under the influence of longrange transported anthropogenic aerosols and that the influence was smaller in the next four days. The events of new particle formation and the subsequent growth, which were evidenced by the substantial increase in the number concentrations of particles with the mobility diameter below ~150 nm, were frequently observed in the last four days of the observation period. Organic component was abundant even below 100 nm in vacuum aerodynamic diameter during this period. These characteristics can be explained by the transport of clean air masses from the North Pacific, which probably lead to lower aerosol concentrations and resulted in the dominance of secondary organic aerosol (SOA) formed from biogenic volatile organic compounds (VOCs). Two organic components, low-volatile oxygenated organic aerosol (LV-OOA) and semivolatile OOA (SV-OOA) were resolved by Positive Matrix Factorization (PMF) analysis. LV-OOA, which correlated well with sulfate and nitrate, was probably composed of long-range transported aerosols from anthropogenic sources and some biogenic SOA. SV-OOA may have mainly been composed of the biogenic SOA; its mass fraction increased substantially in the new particle formation and growth periods.
HR-ToF-AMS Biogenic aerosol Particle growth PMF analysis
Yuemei Han Yoko Iwamoto Tomoki Nakayama Michihiro Mochida
Graduate School of Environmental Studies,Nagoya University,Nagoya,464-8601,Japan Solar-Terrestrial Environment Laboratory,Nagoya University,Nagoya,464-8601,Japan
国际会议
西安
英文
204-209
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）