Seasonal Variation of Deposition Velocity of Sulfur Dioxide in Japan

Abstract

Dry deposition velocities for sulfur dioxide over the terrestrial and nearby oceanic regions in Japan were computed. Seasonal variations of surface roughness scale length, atmospheric stability and regidences for sulfur uptake were estimated from consideration of land use characteristics and the biological status of vegetation. Average deposition velocities for warm and cold season conditions for 80 km mesh grid cells were presented. Estimated deposition velocities of terrestrial regions in the warm season are about 0.5 cm/s, in the cold season, about 0.4 cm/s and in the snow season, less than 0.2 cm/s. The examples clearly illustrate that spatial and temporal variations in dry deposition velocities are important and cannot betignoted ro predict long term deposition patterns in Japan Islands.