The mean and turbulence structure simulation of the monsoon trough boundary layer using a one-dimensional model with e-l and e-epsilon closures

Kusuma, R.G.; Lykossov, V.N.; Prabhu, A.; Sridhar, S.; Tonkacheyev, E.

Авторы: Kusuma Rao G., Lykossov V.N., Prabhu A., Sridhar S., Tonkacheyev E.
Журнал: Proceedings of the Indian Academy of Sciences, Earth and Planetary Sciences
Том: 105
Номер: 3
Год издания: 1996
Издательство: Indian Academy of Sciences
Местоположение издательства: India
Первая страница: 227
Последняя страница: 260
Аннотация: An attempt has been made here to study the sensitivity of the mean and the turbulence structure of the monsoon trough boundary layer to the choice of the constants in the dissipation equation for two stations Delhi and Calcutta, using one-dimensional atmospheric boundary layer model with e-epsilon turbulence closure. An analytical discussion of the problems associated with the constants of the dissipation equation is presented. It is shown here the choice of the constants in the dissipation equation is quite crucial and the turbulence structure is very sensitive to these constants. The modification of the dissipation equation adopted by earlier studies, that is, approximating the TKE generation (due to shear and buoyancy production) in the epsilon-equation by max (shear production, shear_buoyancy production), can be avoided by a suitable choice of the constants suggested here. The observed turbulence structure is better simulated with these constants. The turbulence structure simulation with the constants recommended by Aupoix et al. (1989) (which are interactive in time) for the monsoon region is shown to be qualitatively similar to the simulation obtained with constants suggested here, thus implying that no universal constants exist to regulate dissipation rate. Simulations of the mean structure show little sensitivity to the type of the closure parameterization between e-l and e-epsilon closures. However the turbulence structure siulation with e-epsilon closure is far better compared with e-l model simulations. The model simulations of temperature profiles compare quite well with the observations whenever the boundary layer is well mixed (neutral) or unstable. However the models are not able to simulate the nocturnal boundary layer (stable) temperature profiles. Moisture profiles are simulated reasonably better. With one-dimensional models, capturing observed wind variations is not up to the mark.
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The mean and turbulence structure simulation of the monsoon trough boundary layer using a one-dimensional model with e-l and e-epsilon closuresстатья

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