Aerosol optical,chemical and physical properties at Gosan,Korea during Asian dust and pollution episodes in 2001 |
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| Affiliation: | 1. Institute of Geophysics, University of Tehran, Tehran, Iran;2. Center for Atmospheric Research, University of Canterbury, Christchurch 8140, New Zealand;1. Center for Analysis and Prediction of Storms, and School of Meteorology, University of Oklahoma, Norman, OK 73072, USA;2. Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China;3. Key Laboratory for Atmospheric Chemistry, Center for Atmospheric Watch and Services, Chinese Academy of Meteorological Sciences, Beijing, 100081, China;4. Department of Civil & Environmental Engineering, University of California, Davis, CA 95616, USA;5. Department of Meteorology, Pennsylvania State University, University Park, PA 16802, USA;1. Institute of Environmental Studies, Pusan National University, Busan 46241, Republic of Korea;2. Department of Atmospheric Sciences, Pusan National University, Busan 46241, Republic of Korea;3. National Air Emission Inventory and Research Center, Ministry of Environment, Cheongju 28166, Republic of Korea;4. Department of Earth and Environmental Sciences, Korean University, Seoul 08826, Republic of Korea;5. Department of Climate and Environment, Sejong University, Seoul 05006, Republic of Korea;6. Department of Environmental Science, Hankuk University of Foreign Studies, Yongin 17035, Republic of Korea;7. School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea;8. Climate & Air Quality Research Department, National Institute of Environmental Research (NIER), Incheon 404170, Republic of Korea;1. Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695 022, India;2. ISRO Head Quarters, 560 231, Bangalore, India;3. Regional Remote Sensing Centre (Central), NRSC (Department of Space — Government of India), NBSS-LUP Campus, Amravati Road, Nagpur, India |
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| Abstract: | In order to understand the influence of dust and anthropogenic pollution aerosols on regional climate in East Asia, we analyzed the aerosol optical, chemical and physical properties for two cases with high aerosol loading and assessed the radiative forcing of these cases. The 1st case study is a heavy dust episode (DE) in April (during ACE-Asia) 2001 and the 2nd case is a regional-scale pollution event in November 2001. The Ångström exponent (Å) for DE was 0.38 from sunphotometer measurements. The mean single scattering albedo (550 nm) at the surface reported during the pollution episode (PE, 0.88) was lower than that of DE (0.91). The concentrations of organic (OC) and elemental carbon (EC) measured during the PE were about 90% and 30% higher than DE. The aerosol mass scattering efficiency (αs) of PE is a factor of about 2 higher than that of the DE. The difference in the mass absorption efficiency (αa) of EC during DE and PE is small and within the measurement uncertainty. The diurnally averaged aerosol radiative forcing efficiency (ΔDFE, W m−2 τ−1) during DE is similar to results of other studies at Gosan. |
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