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Aerosol properties and associated regional meteorology during winter pollution event at Gosan climate observatory, Korea
Abstract This paper describes aerosol optical and physical properties and the corresponding meteorological analysis during a winter-time fine aerosol event at a regional background station, Gosan, in Korea. Spatio-temporal distributions of air pollutants over Northeast Asia during winter are governed by continental outflows; however, winter is the highest in magnitude (9.5 ± 8.7 Mm−1) of aerosol absorption coefficient (σ a) among other seasons and the second highest in magnitude (105.3 ± 104.8 Mm−1) of aerosol scattering coefficient (σ s) after spring at the Gosan site. Values for σ s and σ a at Gosan during the winter polluted period (WPP; January 3 to 10, 2008) were recorded as 238.97 ± 123.85 and 18.42 ± 8.49 Mm−1, respectively, which were approximately 5 times greater than those during the winter clean period (WCP; January 13 to 16, 2008) of this study. An ensemble analysis of the OMI aerosol index, wind vectors and background trajectories during the WPP reveals that a slow-moving anticyclonic system, preceded by a frontal system, brought heavy aerosol loading from the Asian continent to the Gosan site. Space-based lidar CALIOP observations support the presence of heavy loadings of aerosol and pollutant plumes over the Yellow sea, before arriving at the Gosan.
Highlights We analyzed aerosol properties and the corresponding meteorological fields at Gosan. Winter has the highest in magnitude of σ a and the second highest in magnitude of σ s. Among the winter polluted period, aerosol optical properties belong to the top 15%. A slow-moving anticyclonic flow brings heavy loadings of aerosols to Gosan.
Aerosol properties and associated regional meteorology during winter pollution event at Gosan climate observatory, Korea
Abstract This paper describes aerosol optical and physical properties and the corresponding meteorological analysis during a winter-time fine aerosol event at a regional background station, Gosan, in Korea. Spatio-temporal distributions of air pollutants over Northeast Asia during winter are governed by continental outflows; however, winter is the highest in magnitude (9.5 ± 8.7 Mm−1) of aerosol absorption coefficient (σ a) among other seasons and the second highest in magnitude (105.3 ± 104.8 Mm−1) of aerosol scattering coefficient (σ s) after spring at the Gosan site. Values for σ s and σ a at Gosan during the winter polluted period (WPP; January 3 to 10, 2008) were recorded as 238.97 ± 123.85 and 18.42 ± 8.49 Mm−1, respectively, which were approximately 5 times greater than those during the winter clean period (WCP; January 13 to 16, 2008) of this study. An ensemble analysis of the OMI aerosol index, wind vectors and background trajectories during the WPP reveals that a slow-moving anticyclonic system, preceded by a frontal system, brought heavy aerosol loading from the Asian continent to the Gosan site. Space-based lidar CALIOP observations support the presence of heavy loadings of aerosol and pollutant plumes over the Yellow sea, before arriving at the Gosan.
Highlights We analyzed aerosol properties and the corresponding meteorological fields at Gosan. Winter has the highest in magnitude of σ a and the second highest in magnitude of σ s. Among the winter polluted period, aerosol optical properties belong to the top 15%. A slow-moving anticyclonic flow brings heavy loadings of aerosols to Gosan.
Aerosol properties and associated regional meteorology during winter pollution event at Gosan climate observatory, Korea
Kim, Yumi (author) / Kim, Sang-Woo (author) / Yoon, Soon-Chang (author) / Kim, Man-Hae (author) / Park, Ki-Hark (author)
Atmospheric Environment ; 85 ; 9-17
2013-11-15
9 pages
Article (Journal)
Electronic Resource
English
Time-Resolved Measurements of PM2.5 Carbonaceous Aerosols at Gosan, Korea
| Taylor & Francis Verlag | 2011