Characteristics of air pollution in the presence of land and sea breeze-A numerical simulation

Abstract

Characteristics of air pollution in the coastal region in the presence of the land and sea breeze were investigated numerically. First, two-dimensional primitive equations of momentum and heat were integrated to simulate the wind field of the land and sea breeze. Then, the motion of pollutant emitted into the land and sea breeze circulation, after its diurnal variation became completely cyclic, were traced for three days. Three cases with constant emission rate from line sources which are located aloft on the shoreline and on the sea surface, respectively, and from the surface source along the shore were examined. Characteristics of the diurnal pattern, including the apparent "background concentration" on the shore, as well as the daily variation of the pollutant concentration were discussed. From the analysis of long-period trajectories of neutrally-buoyant particles, general macroscopic motions of the pollutant were revealed. © 1983.