Transboundary Transport of Nitrogen Oxides from the Asian Continent to Fukue Island, Japan: Analyses of Long-Range Transport of Nitrogen Compounds

作     者：Sadanaga, Yasuhiro Takaji, Ryo Takami, Akinori Bandow, Hiroshi 

作者机构：Osaka Prefecture Univ Dept Appl Chem Sakai Osaka 5998531 Japan Natl Inst Environm Studies Tsukuba Ibaraki 3058506 Japan 

出 版 物：《AEROSOL AND AIR QUALITY RESEARCH》 (Aerosol Air Qual. Res.)

年 卷 期：2017年第17卷第12期

页      面：2981-2987页

核心收录：

基　　金：Japan Society for the Promotion of Science Steel Foundation for Environmental Protection Technology [9, 11] Environment Research and Technology Development Fund of the Ministry of Environment, Japan [B-1006, 5-1452, 2-1403] Grants-in-Aid for Scientific Research [15H02803, 17K00525, 23241008] Funding Source: KAKEN 

主　　题：Nitrogen oxides Total nitrate Total odd nitrogen species Long-range transport East Asia 

摘      要：To investigate long-range transport and oxidation states of nitrogen compounds from the Asian continent, especially of total odd nitrogen species (NOy), we carried out continuous observations of NOy, total nitrate (***3;the sum of gaseous nitric acid and particulate nitrate) and NOx (= NO + NO2) at Fukue Island, located in westernmost Japan. NOy and ***3 exhibited similar seasonal cycles, with maximum concentrations observed during winter-spring seasons, and minimum concentrations during summer. NOx had a seasonal cycle, with maximum and minimum concentrations in winter and summer, respectively;NOx concentrations also decreased markedly from winter to spring. High-concentration event analyses to assess transboundary pollution of NOy were performed. Transboundary pollution events for NOy were extracted, and classified as either Case 1 or Case 2. Case 1 involved transport of NOy, ***3, and NOx from the Asian continent to Fukue Island, while Case 2 involved transport of NOy and ***3, but not NOx. Case 1 and Case 2 occurred predominantly in winter and spring, respectively. Air mass trajectories indicated that in Case 1, 52% of air masses passed through Korea, while only 5% passed through Korea in Case 2. These results indicate that some NOx emitted from the Asian continent is transported to Fukue Island as NOx, without it undergoing oxidation, reflecting low photochemical activity and/or short transport times.