Impact of Anomalous Meteorological Variables on Pm10 Aerosol Formation During Regional Transport in the East Asian Region in March of 2021
The impact of anomalous meteorological variables on the promotion of PM 10 aerosol formation was analysed using the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) applying both meteorological data and climate data during March 13-15 of 2021. Despite the decreasing trend of the MODIS-induced columnar atmospheric aerosol optical depth (AOD) in the East Asian region, anomalous variations were indicated as positive in areas from north-eastern China to Korea through the Yellow Sea during March of 2021. The anomaly distributions of a warm air mass with a high positive air temperature were consistent with positive AOD anomaly distributions around north-eastern China. In Korea, located in the downwind area of the East Asian region, high-PM 10 severe haze days exceeding the World Health Organization (WHO) threshold value of 50 µg m -3 day -1 were caused frequently by the regional transport of anthropogenic aerosols and dust storms during March of 2021. Daily anomalous variations of positive air temperatures and negative wind speeds prevailed in Korea, with the correlation variables of the daily PM 10 variations being +0.48 (P<0.05) and -0.55 (P<0.05), respectively. WRF-Chem model simulations reveal that the positive PM 10 anomaly was high in the boundary air within 1 km under regional transport from eastern China to Korea, with PM 10 anomalous ratios (PM 10 AR) increasing to approximately 60% in Korea during the high-PM 10 severe haze days of March 14-15, 2021. The hourly PM 10 contribution according to anomalous meteorological variables (PM 10 CbAMV) increased to 70% in Seoul, Korea. Among inorganic PM 10 aerosols, higher nitrate concentrations were formed by the warm and stagnant air mass rich in ammonium under regional transport in the East Asian region
Year of publication: |
[2022]
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Authors: | Cho, Jae-Hee ; Kim, Hak-Sung |
Publisher: |
[S.l.] : SSRN |
Subject: | Regionale Wirtschaftsintegration | Regional economic integration | Ostasien | East Asia |
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