Daily variation of organic aerosol concentration and composition in Seoul, Korea during KORUS pre-campaign

Abstract:

Daily variation of Organic Aerosol (OA) as well as organic tracer compounds have been observed in aerosol samples collected during KORUS-AQ (Korea-US Air Quality Study) pre-campaign (From May 18 to June 12) in Seoul, Korea. NR-PM1 bounded OA was measured by HR-TOF-AMS (Aerodyne) and the temporal variation, composition of OA by family group characterization, and oxidation state of OA was studied. And to distinguish the source characteristics (such as HOA, COA, NOA, SV-OOA, LV-OOA, etc…) of the organic, AMS-PMF model will be used.
For the observation of organic tracer compounds, solvent extractable fractions were analyzed by GC-MS. More than 80 organic compounds were detected in the aerosol samples and grouped by source characterized classes, including vehicular emission tracers, biomass burning tracers, coal emission tracers, secondary organic aerosol (SOA) tracers.
The main objective of this study is evaluation of the validity of OA fractionation based on the AMS measurement. So, we will compare daily variation of OA composition measured by AMS with daily variation of organic tracer compounds. Further, we will specify source characteristics estimated using AMS-PMF model by comparing the results of source apportionment of OA using PMF of organic tracer compounds.