A LONG-RANGE TRANSPORT OF SO2 AND SULFATE BETWEEN KOREA AND EAST CHINA

The STEM II (Sulfur Transport Eulerian Model II) was adapted to simula te transport/chemistry/deposition of air pollutants in Korea and East China. A 72 h model simulation starting from 9 a.m. 25 November LST, 1 989 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 O-3 is underpredicted due to inaccurate VOC rel ated input data. In addition, water soluble species such as H2O2 and H NO3 were washed out rapidly and the fastest wet deposition velocity wa s 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 I ndex was developed to quantify the importance of transport of air poll utants in determining the air quality. (C) 1998 Elsevier Science Ltd. All rights reserved.