The Effect of the Mixing Layer on the Sea Breeze Circulation and the Diffusion of Pollutants Associated with Land-Sea Breezes

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Abstract
The effects of the mixing layer which will develop over the land in the daytime on the sea breeze circulation are investigated by the two-dimensional numerical model using Yamamoto's empirical eddy diffusion formula in the transition layer. The results show when the mixing layer well develops the sea breeze is stronger and the penetration speed of the sea breeze front is faster than in the hypothetical cases in which the mixing layer is not well developed. Diffusion processes of pollutants associated with the land-sea breeze are also investigated by the both Lagrangian and Eulerian methods. It is found when the sources of pollutants exist only near the coast, no high concentration of the pollutants occurs in the mixing layer, because as the sea breeze is entering inland, the sources of the pollutants are left out of the mixing layer and the ascending flow at the sea breeze front prevents the pollutants from entering the mixing layer.

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