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Role of Dust and Iron Solubility in Sulfate Formation during the Long-Range Transport in East Asia Evidenced by 17O-Excess Signatures.
Itahashi, Syuichi; Hattori, Shohei; Ito, Akinori; Sadanaga, Yasuhiro; Yoshida, Naohiro; Matsuki, Atsushi.
Afiliação
  • Itahashi S; Sustainable System Research Laboratory (SSRL), Central Research Institute of Electric Power Industry (CRIEPI), Abiko, Chiba 270-1194, Japan.
  • Hattori S; International Center for Isotope Effects Research (ICIER), Nanjing University, Nanjing 210023, Jiangsu, China.
  • Ito A; School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China.
  • Sadanaga Y; Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8502, Kanagawa, Japan.
  • Yoshida N; Institute of Nature and Environment Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Ishikawa, Japan.
  • Matsuki A; Yokohama Institute for Earth Sciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kanazawa-ku, Yokohama 236-0001, Kanagawa, Japan.
Environ Sci Technol ; 56(19): 13634-13643, 2022 10 04.
Article em En | MEDLINE | ID: mdl-36107476
Numerical models have been developed to elucidate air pollution caused by sulfate aerosols (SO42-). However, typical models generally underestimate SO42-, and oxidation processes have not been validated. This study improves the modeling of SO42- formation processes using the mass-independent oxygen isotopic composition [17O-excess; Δ17O(SO42-)], which reflects pathways from sulfur dioxide (SO2) to SO42-, at the background site in Japan throughout 2015. The standard setting in the Community Multiscale Air Quality (CMAQ) model captured SO42- concentration, whereas Δ17O(SO42-) was underestimated, suggesting that oxidation processes were not correctly represented. The dust inline calculation improved Δ17O(SO42-) because dust-derived increases in cloud-water pH promoted acidity-driven SO42- production, but Δ17O(SO42-) was still overestimated during winter as a result. Increasing solubilities of the transition-metal ions, such as iron, which are a highly uncertain modeling parameter, decreased the overestimated Δ17O(SO42-) in winter. Thus, dust and high metal solubility are essential factors for SO42- formation in the region downstream of China. It was estimated that the remaining mismatch of Δ17O(SO42-) between the observation and model can be explained by the proposed SO42- formation mechanisms in Chinese pollution. These accurately modeled SO42- formation mechanisms validated by Δ17O(SO42-) will contribute to emission regulation strategies required for better air quality and precise climate change predictions over East Asia.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Poluentes Atmosféricos / Poeira Tipo de estudo: Prognostic_studies País como assunto: Asia Idioma: En Ano de publicação: 2022 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Poluentes Atmosféricos / Poeira Tipo de estudo: Prognostic_studies País como assunto: Asia Idioma: En Ano de publicação: 2022 Tipo de documento: Article