Deposition of Anthropogenic Nutrient Transported from the Urban Area to the Sea Surface

Abstract

To estimate dry and wet deposition flux of anthropogenic nutrient transported from the urban area to the sea surface, we observed behaviors of PM2.5, which is particulate matter smaller than about 2.5 micrometer generated from car, truck and bus in Hiroshima city. We have also developed a numerical simulation model that consists of atmospheric and chemical reaction model. We investigated characteristic of nitrate and NO₃^- in time and space and then estimated the dry and wet deposition flux. The nitrate deposition flux generated from vehicle transportation in the urban area affects the ocean environment at nearshore zone and its concentration can be computed by the model.