Increase in springtime tropospheric ozone at a mountainous site in Japan for the period 1998–2006 |
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| Authors: | Hiroshi Tanimoto |
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| Affiliation: | 2. Institute of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan;3. JSPS Research Fellow;4. Department of Plant Ecology, Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba 305-8687, Japan;5. Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, Abiko, Chiba 270-1194, Japan;1. Nanjing University of Information Science & Technology, Nanjing 210044, China;2. State Key Laboratory of Severe Weather & CMA Key Laboratory for Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, No.46 Zhongguancun South Street, Haidian District, Beijing 100081, PR China;3. Shenyang Institute of Atmospheric Environment, China Meteorological Administration, No.388 Changbai South Road, Heping District, Shenyang 110066, PR China;4. College of Life & Environmental Science, Minzu University of China, No.27 Zhongguancun South Street, Haidian District, Beijing 100081, PR China;1. Indian Institute of Tropical Meteorology, Pune, India;2. European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra, Italy;3. Lancaster Environment Centre, Lancaster University, Lancaster, UK |
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| Abstract: | The trend of tropospheric ozone from 1998 to 2006 was examined based on continuous measurements made at a site on Mt. Happo, Japan. We focused our study on springtime ozone, to coincide with the East Asian continental outflow that dominates the lower tropospheric ozone over Japan during this season. The observed increase of ～1 ppbv yr?1 in the mean ozone level was statistically significant. We also found that the probability distribution of the springtime ozone mixing ratios was substantially modified, with the ozone mixing ratios greatly increasing at the upper end of the probability distribution. This increase has been particularly large since 2003, with larger increases occurring at the higher percentiles. The number of high-ozone days doubled during 2003–2006 compared to 1999–2002. One of the very likely explanations is the enhancement of regional ozone pollution due to rapidly increasing anthropogenic emissions from East Asia. |
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