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Identification and Chemical Characteristics of Distinctive Chinese Outflow Plumes Associated with Enhanced Submicron Aerosols at the Gosan Climate Observatory

Category: Aerosol and Atmospheric Chemistry

Accepted Manuscripts
DOI: 10.4209/aaqr.2017.03.0115
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Xiaona Shang1, Meehye Lee 1, Jihyun Han1, Eunha Kang2, Sang Woo Kim3, Örjan Gustafsson4, Limseok Chang5

  • 1 Department of Earth and Environmental Sciences, Korea University, Seoul, Korea
  • 2 Suwon Research Institute, Suwon, Korea
  • 3 School of Earth and Environmental Sciences, Seoul National University, Seoul, Korea
  • 4 Department of Applied Environmental Science (ITM) and the Bert Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
  • 5 National Institute of Environmental Research, Incheon, Korea

Abstract

During October–November 2010 and March 2011, when Chinese outflow events were frequently encountered, the chemical composition of submicron particles (PM1.0) was determined hourly using a particle-into-liquid sampler at the Gosan Climate Observatory. Three distinctive pollution plume types were identified: haze aerosols impacted by biomass combustion, nanoparticle bursts associated with outflow from Beijing, and saline soil particles from salt deposits. The highest PM1.0 concentration was observed in a fall haze event, under near-stagnant high pressure synoptic conditions, that was characterized by the lowest visibility (< 5 km) and the highest K+ and OC concentrations, indicating the influence of biomass combustion. When strong high-pressure systems develop in China, it efficiently exports fresh urban emissions from Beijing to the study region, as distinguished by nanoparticle bursts of > 104 cm–3 with highly elevated SO2 levels, even during the night. When air masses move rapidly from northeastern China to Gosan under strong wind conditions, the Ca2+ concentration is enhanced in PM1.0 along with that of Cl and Na+, which is attributed to the influence of saline transport from dry lakes. The results of this study reveal compositional details and information on both number and mass concentration for different PM1.0 plumes from anthropogenic and natural sources, all of which were associated with different kinds of Chinese outflow events.

Keywords

Submicron particles Particle-into-liquid sampler Chinese outflow plume Haze Gosan


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