AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Abstract View
Seasonal Variaction and Characteristics of Carbonaceous Aerosol in PM2.5 of the Background Atmosphere in Korea
JIYI LEE, Jong Sik Lee, Yu Woon Jang, Eun Sil Kim, Yong Pyo Kim, Chang Hoon Jung, Chosun University
Abstract Number: 679 Working Group: Carbonaceous Aerosols in the Atmosphere
Abstract Routine measurements of organic carbon (OC), elemental carbon (EC), water-soluble organic carbon (WSOC) and Humic Like Substance-Carbon (HULIS-C) in PM2.5 were carried out at Anmyeon Island (AI) to understand seasonal variation and the level of carbonaceous aerosol concentrations at a background area in Korea between 2015 and 2016. Annual average concentrations of OC and EC were 4.47±3.04µg/m$^3 and 0.41±0.18µg/m$^3, respectively. OC and EC concentrations showed same seasonal variation with summer minimum and fall maximum, while, the composition of OC and EC was consistent (90% of OC and 10% of EC in carbonaceous aerosol). The average concentrations of WSOC and WISOC were 2.54±1.74µg/m$^3 and 1.93±1.42µg/m$^3, respectively, and their composition in OC shows high variation in the sample. WISOC was calculated by subtraction of WSOC from OC and good correlation of WISOC with EC was observed. It means WISOC is originated from primary emission. While, WSOC concentrations were highly related with SOC (Secondary Organic Carbon) concentrations which were estimated by the EC tracer method. The results indicate the formation of secondary organic aerosol (SOA) is major factor for the determination of WSOC concentrations in this region. HULIS-C as known one of brown carbon was major component of WSOC which accounts for 39 to 99% in WSOC. The average concentrations of HULIS-C was 2.02±1.42µg/m$^3 and the highest concentration was observed in fall. About 100 individual organic compounds were also analyzed and seasonal characteristics of their distributions in the atmosphere were investigated to understand the relation carbonaceous aerosol with the compounds.