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| 1 | Measurement of hydrogen peroxide and organic hydroperoxide concentrations during autumn in Beijing, China显示文摘Gaseous peroxides play important roles in atmospheric chemistry. To understand the pathways of the formation and removal of peroxides, atmospheric peroxide concentrations and their controlling factors were measured from 7:00 to 20:00 in September, October, and November 2013 at a heavily trafficked residential site in Beijing, China, with average concentrations of hydrogen peroxide(H_2O_2) and methyl hydroperoxide(MHP) at 0.55 ppb and 0.063 ppb, respectively. H_2O_2 concentrations were higher in the afternoon and lower in the morning and evening, while MHP concentrations did not exhibit a regular diurnal pattern. Both H_2O_2 and MHP concentrations increased at dusk in most cases. Both peroxides displayed monthly variations with higher concentrations in September. These results suggested that photochemical activity was the main controlling factor on variations of H_2O_2 concentrations during the measurement period. Increasing concentrations of volatile organic compounds emitted by motor vehicles were important contributors to H_2O_2 and MHP enrichment. High levels of H_2O_2 and MHP concentrations which occurred during the measurement period probably resulted from the transport of a polluted air mass with high water vapor content passing over the Bohai Bay, China. | Qingyu Zhang Jiaoyu Liu Youjiang He Jiaying Yang Jian Gao Houfeng Liu Wei Tang Yizhen Chen Wenhao Fan Xuan Chen Fahe Chai Shiro Hatakeyama | 2018 | Journal of Environmental Sciences2018，30，2： | 2 |
| 2 | Observation of ozone and carbon monoxide at Cape Hedo, Japan: Seasonal variation and influence of long-range transport显示文摘 | Jeeranut Suthawaree Shungo Kato Akinori Takami Hisayoshi Kadena Mikiko Toguchi Kazuo Yogi Shiro Hatakeyama Yoshizumi Kajii | 2007 | Atmospheric Environment2007，，13： | 1 |
| 3 | Characteristic of organic aerosol in a remote area of Okinawa Island显示文摘A continuous investigation of aerosol pollutants in Cape Hedo, Japan was conducted from October 2005 to August 2006 by Aerodyne aerosol mass spectrometer (AMS). This article focused on the analysis of long-range transport of organic aerosol from continental origin to the remote island. Based on the transport distance and air mass origin, four main air mass origins were considered, including North China, South China, Japan and Korea. Although the mass concentration and air mass origin were quite different during study period, the mass spectrum and size distribution of organic matter and oxidized organics were similar, which showed uni-modal distribution with modal diameter of around 500 nm. The loss rate of organics was (5.15 ± 0.55) × 10-6 s-1 obtained by plotting the concentration against the transport time. Conversion rate of SO2 to sulfate and oxidation rate of organics were (1.07 ± 0.15) × 10-5 and (1.09 ± 0.52) × 10-6 s-1, respectively. | LUN Xiaoxiu TAKAMI Akinori MIYOSHI Takao HATAKEYAMA Shiro | 2009 | Journal of Environmental Sciences2009，21，10： | 1 |
| 4 | Peroxy Radical Concentrations Measured at a Forest Canopy in Nikko, Japan, in Summer 2002显示文摘 | Bin Qi Akinori Takami Shiro Hatakeyama | 2005 | Journal of Atmospheric Chemistry2005，，1： | 1 |
| 5 | Photochemical production of ozone in marine boundary layer in the sea of Japan:Results of the Rishiri Fall Experiment campaign显示文摘The Rishiri Fall Experiment (RISFEX ) campaign was performed in September 2003 at Rishiri island (45.07 N,141.12 E,and 35 m asl) in the sea of Japan to investigate photochemical production of ozone in the marine boundary layer. Total peroxy radicals ROx (HO2 + RO2) and NOx (NO + NO2) were measured together with other chemical species and physical parameters relevant to ozone production. The ozone production rate (P(O3)) was estimated from measured peroxy radicals and was found to be highly variable between days,with 30-min averaged midday values varying from 0.2 to 1.7 ppbv/h (ppbv refers to part per billion by volume). The daytime mean P(O3) for the air masses from relatively clean NE sector is close to zero,but significantly higher for air masses from more polluted W and SE sector,suggesting the impact of transport of pollutants on the remote local ozone production. The experimentally determined P(O3) is compared with those derived from a time-dependent box model based on Regional Atmospheric Chemistry Modeling (RACM),and both the methods give the results generally in agreement. The model calculation shows that HO2 + NO reaction contributes most to ozone production,ca. 60% at midday,followed by the reactions of CH3O2 and ISOP (peroxy radicals formed from isoprene) with NO which account for ca. 13% and 10% to ozone production,respectively,at noon. Sensitivity analysis indicates that the ozone production during the measurement period is within NOx-limited regime. | QI Bin WANG ZhuQing TAKAMI Akinori HATAKEYAMA Shiro | 2009 | Science China Chemistry2009，52，12： | 1 |
| 6 | Peroxy Radical Concentrations Measured at a Forest Canopy in Nikko, Japan, in Summer 2002显示文摘 | Bin Qi Akinori Takami Shiro Hatakeyama | 2005 | Journal of Atmospheric Chemistry2005，，1： | 1 |
| 7 | Long-range transport of organic aerosol to Cape Hedo,Japan显示文摘An investigation at Cape Hedo, Japan, from 2005 to 2006, focused on the long-range transport of organic aerosol(OA) from the Asian continent. An Aerodyne aerosol mass spectrometer was used to investigate the OA data collected over the study. OA concentrations were low from July to September and peaked during March and April. Based on air mass origins, four OA source regions were identified: northern China,southern China, Japan, and Korea. OA concentrations measured at Cape Hedo from the four sources did not exhibit large differences. Conversely, the frequencies of the air masses reaching Cape Hedo from the different regions varied considerably. Northern China was identified as the primary source of organic aerosols at Cape Hedo. Examination of variations in the ratio of m/z44 to OA concentrations with transport time showed that OAs were partially oxidized during | Xiaoxiu Lun Akinori Takami Weifang Ma Akio Shimono Shiro Hatakeyama | 2014 | Particuology2014，12，2： | 0 |
| 8 | Vertical profiles of aerodynamic size distribution for airborne particles over Yangtze River Delta显示文摘 | 王玮 鲍林发 刘红杰 岳欣 陈建华 李红 任丽红 汤大钢 Shiro Hatakeyama and Akinori Takami | 2007 | Chinese Physics B2007，16，9： | 0 |
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