A long range transport of SO2 and Sulfate between Korea and East China

The STEM II (Sulfur Transport Eulerian Model II) was adapted to simulate transport/chemistry/deposition of air pollutants in Korea and East China. A 72 h model simulation starting from 9 a.m. 25 November LST, 1989 was performed, during which a light precipitation occurred for the last 36 h. The model predictions for NO and SO2 agree reasonably well with measurements but O3 is underpredicted due to inaccurate VOC related input data. In addition, water soluble species such as H2O2 and HNO3 were washed out rapidly and the fastest wet deposition velocity was found in the region where the rain fall velocity is the highest. The movement of the high concentration region was clearly identified for the sulfate but was not visible for SO2. The Air Pollutant Transport Index was developed to quantify the importance of transport of air pollutants in determining the air quality.