2026-03-08T06:50:26Z https://kitakyu.repo.nii.ac.jp/oai

oai:kitakyu.repo.nii.ac.jp:00001041 2026-01-31T02:10:45Z 11:10

九州北部地域における大気汚染の支配要因に関する研究--越境移動と地域気象 Study on controlling factors of air pollution in northern part of Kyushu, Japan: Transboundary transportation and local meteorology condition 彭, 媛 1239 air pollution transboundary transport anthropogenic/non-sea-salt inorganic chloride local meteorology condition atmospheric methane concentrations atmospheric stability temperature inversion layer grounded temperature inversion layer 北九州市立大学 博士(工学) This study investigated the effects of transboundary transport and local meteorological conditions on air quality in northern part of Kyushu, Japan. The presence and sources of anthropogenic/non-sea-salt inorganic chloride (nss-Cl) in ambient air were studied by applying the four-stage filter pack system with a daily sampling collection over one year. Anthropogenic/nss-Cl concentrations above 20 nmol∙m⁻³ were observed over 50 days, and the 72-h backward trajectory results suggest a strong correlation with transboundary transport in the west/northwest rather than with domestic/local emissions from waste incineration, coal combustion, and volcanic eruptions. And, based on atmospheric methane concentrations. The atmosphere in the urban center area was stable at ca. 200 m, during daytime and even in the summer; meanwhile, the suburbs formed the grounded temperature inversion layer at night in the summer. Interestingly, it was not formed in winter all day, likely because of the strong wind velocity due to the monsoon. doctoral thesis 2022-09-26 VoR application/pdf 甲第200号 https://kitakyu.repo.nii.ac.jp/record/1041/files/(KKDE1200PY)甲第200号_ホウ　エン.pdf https://kitakyu.repo.nii.ac.jp/records/1041 eng open access