AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Abstract View
Estimation of Polydispersed Aerosol Optical Properties during Smog and Asian Dust Events in Korea
CHANG HOON JUNG, JiYi Lee, Yong Pyo Kim, Kyungin Women's University
Abstract Number: 394 Working Group: Aerosol Chemistry
Abstract This study investigates the optical properties of aerosol for different meteorological events, including smog and Asian dust. Sampling was performed in Seoul, a representative urban site in Korea. Organic carbon (OC) and inorganic species were measured, and the OC and Elemental Carbon (EC) in the sample filters were analyzed using the thermal/optical transmittance (TOT) method. During the sampling period, data from the smog and Asian dust events data was compared with that from normal days.
The calculated optical properties were compared with the Aerosol Optical Thickness (AOT) obtained from remote sensing data, and the results showed comparable trends.
The results show the comparison of the aerosol extinction efficiency and AOT (Aerosol Optical Thickness) during the sampling periods. The aerosol extinction efficiency of PM2.5 is compared with those for AOT. The internal mixture and the fully external mixture are both considered, and we compared the AOT data from Seoul. A close relationship exists between AOT and the extinction coefficient. A comparison between internal mixture and fully external mixture does not show much of a discrepancy.
This study also shows a comparison of the aerosol extinction efficiency and the AOT (Aerosol Optical Depth) during the sampling periods when each composition has been excluded. The slope changes due to each aerosol, and the correlation coefficient shows different values that depend on the composition. A comparison with the correlation coefficient for the total aerosol, excluding the OC aerosol, shows a more relevant relation when compared to AOT, which means that the explanation of OC in AOT is not enough.