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Atmosphere 2018, 9(12), 488;

Model Performance Differences in Sulfate Aerosol in Winter over Japan Based on Regional Chemical Transport Models of CMAQ and CAMx

Central Research Institute of Electric Power Industry, Abiko, Chiba 270-1194, Japan
Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27607, USA
Graduate School of Maritime Sciences, Kobe University, Kobe, Hyogo 658-0022, Japan
National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, Japan
Nagoya City Institute for Environmental Sciences, Toyota, Minami-Ku, Nagoya, Aichi 457-0841, Japan
Tokyo Metropolitan Research Institute for Environmental Protection, Koto-Ku, Tokyo 136-0075, Japan
Author to whom correspondence should be addressed.
Received: 1 November 2018 / Revised: 30 November 2018 / Accepted: 7 December 2018 / Published: 10 December 2018
(This article belongs to the Section Aerosols)
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Sulfate aerosol (SO42−) is a major component of particulate matter in Japan. The Japanese model intercomparison study, J-STREAM, found that although SO42− is well captured by models, it is underestimated during winter. In the first phase of J-STREAM, we refined the Fe- and Mn-catalyzed oxidation and partly improved the underestimation. The winter haze in December 2016 was a target period in the second phase. The results from the Community Multiscale Air Quality (CMAQ) and Comprehensive Air quality Model with eXtentions (CAMx) regional chemical transport models were compared with observations from the network over Japan and intensive observations at Nagoya and Tokyo. Statistical analysis showed both models satisfied the suggested model performance criteria. CMAQ sensitivity simulations explained the improvements in model performance. CMAQ modeled lower SO42− concentrations than CAMx, despite increased aqueous oxidation via the metal catalysis pathway and NO2 reaction in CMAQ. Deposition explained this difference. A scatter plot demonstrated that the lower SO42− concentration in CMAQ than in CAMx arose from the lower SO2 concentration and higher SO42− wet deposition in CMAQ. The dry deposition velocity caused the difference in SO2 concentration. These results suggest the importance of deposition in improving our understanding of ambient concentration behavior. View Full-Text
Keywords: CMAQ; CAMx; East Asia; SO2; SO42−; deposition CMAQ; CAMx; East Asia; SO2; SO42−; deposition

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Itahashi, S.; Yamaji, K.; Chatani, S.; Hisatsune, K.; Saito, S.; Hayami, H. Model Performance Differences in Sulfate Aerosol in Winter over Japan Based on Regional Chemical Transport Models of CMAQ and CAMx. Atmosphere 2018, 9, 488.

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