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Lu Yang,Ning Tang,Atsushi Matsuki,Akinori Takami,Shiro Hatakeyama,Naoki Kaneyasu,Edward G. Nagato,Kei Sato,Ayako Yoshino,Kazuichi Hayakawa 한국대기환경학회 2018 Asian Journal of Atmospheric Environment (AJAE) Vol.12 No.4
This is the first comparative study to examine two different background monitoring sites in Japan to compare differences in the concentration and composition of long-range-transported polycyclic aromatic hydrocarbons (PAHs) from the Asian continent. This study chose the Noto Peninsula (the Kanazawa University Wajima Air Monitoring Station; WAMS) and Fukue Island (the Fukue-jima Atmosphere and Aerosol Monitoring Station; FAMS) to compare 10 weekly periods in 2009 and 2010 from autumn to spring, seasons that are strongly influenced by the Asian continent. The PAHs concentration differed significantly for most periods at these two sites. The backward trajectory analysis found that the low height of the air mass may cause the low concentration and the similar air mass condition could result in the similar concentration. The concentration of long-range-transported PAHs depended more on the source of the coal combustion areas such as Northeast China in heating period.
Numerical Simulation of Extreme Air Pollution by Fine Particulate Matter in China in Winter 2013
Hikari Shimadera,Hiroshi Hayami,Toshimasa Ohara,Yu Morino,Akinori Takami,Satoshi Irei 한국대기환경학회 2014 Asian Journal of Atmospheric Environment (AJAE) Vol.8 No.1
In winter 2013, extreme air pollution by fine particulatematter (PM2.5) in China attracted much publicattention. In order to simulate the PM2.5 pollution,the Community Multiscale Air Quality model drivenby the Weather Research and Forecasting model wasapplied to East Asia in a period from 1 January 2013to 5 February 2013. The model generally reproducedPM2.5 concentration in China with emission data inthe year 2006. Therefore, the extreme PM2.5 pollutionseems to be mainly attributed to meteorological (weakwind and stable) conditions rather than emissionincreases in the past several years. The model wellsimulated temporal and spatial variations in PM2.5concentrations in Japan as well as China, indicatingthat the model well captured characteristics of thePM2.5 pollutions in both areas on the windward andleeward sides in East Asia in the study period. Inaddition, contribution rates of four anthropogenicemission sectors (power generation, industrial, residentialand transportation) in China to PM2.5 concentrationwere estimated by conducting zero-out emissionsensitivity runs. Among the four sectors, the residentialsector had the highest contribution to PM2.5concentration. Therefore, the extreme PM2.5 pollutionmay be also attributed to large emissions from combustionfor heating in cold regions in China.
Yasuhiro Sadanaga,Tadashi Kobashi,Akie Yuba,Shungo Kato,Yoshizumi Kajii,Akinori Takami,Hiroshi Bandow 한국대기환경학회 2015 Asian Journal of Atmospheric Environment (AJAE) Vol.9 No.4
We conducted intensive observations of ozone, CO, NOx (=NO and NO2), NOy (total odd nitrogen species including particulate nitrate) and total nitrate (the sum of gaseous HNO3 and particulate nitrate) at Cape Hedo, Okinawa, Japan, from 19 March to 3 April, 2009, to investigate ozone production during long-range transport from the Asian continent. Ozone production efficiency (OPE) was used to evaluate photochemical ozone production. OPE is defined as the number of molecules of ozone produced photochemically during the lifetime of a NOx molecule. OPE is calculated by the ratio of the concentration increase of ozone to that of NOz (= NOy -NOx). Average OPE during observation was estimated to be 12.6±0.5, but concentrations of ozone increased nonlinearly with those of NOz. This non-linearity suggests that OPE depends on air mass origin and NOz concentrations. There were very different values of OPE for the same air mass origin, so that only the air mass origin alone does not control OPE. OPE was low when NOz concentration was high. We examined the correlation between NOz and CO/NOy ratios, which we used instead of the ratio of nonmethane hydrocarbons (NMHCs) to NOx. The CO/NOy ratios decreased with increasing NOz concentrations. These results indicate that competition reactions of OH with NMHCs and NO2 are the rate determining steps of photochemical ozone production during longrange transport from the Asian continent to Cape Hedo, for high concentrations of nitrogen oxides.