Journal
ENVIRONMENTAL POLLUTION
Volume 221, Issue -, Pages 285-292Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2016.11.075
Keywords
Aerosol; Winter monsoon; East Asia; Chemical transport model
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Funding
- GEMS Program of the Ministry of Environment, Korea
- Eco Innovation Program of KEITI [ARQ201204015]
- Korea Ministry of Environment as a Climate Change Correspondence Program
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We investigate the relationship between winter aerosol concentrations over East Asia and variability in the East Asian winter monsoon (EAWM) using GEOS-Chem 3-D global chemical transport model simulations and ground-based aerosol concentration data. We find that both observed and modeled surface aerosol concentrations have strong relationships with the intensity of the EAWM over northern (30 -50 degrees N, 100-140 degrees E) and southern (20-30 degrees N, 100-140 degrees E) East Asia. In strong winter monsoon years, compared to weak winter monsoon years, lower and higher surface PM2.5 concentrations by up to 25% are shown over northern and southern East Asia, respectively. Analysis of the simulated results indicates that the southward transport of aerosols is a key process controlling changes in aerosol concentrations over East Asia associated with the EAWM. Variability in the EAWM is found to play a major role in interannual variations in aerosol concentrations; consequently, changes in the EAWM will be important for understanding future changes in wintertime air quality over East Asia. (C) 2016 Elsevier Ltd. All rights reserved.
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