A Study of The Impact of Full-component Coriolis Force on Regional Climate Modeling Over Tropical Areas

Abstract:

In most numerical weather prediction models, the cosine terms of the Coriolis force are omitted due to the use of shallow-atmosphere approximation with the angular momentum principle. However, by applying the non-hydrostatic deep momentum system, we can omit the angular momentum principle for regional modeling, while leaving the cosine terms, to calculate the full-component Coriolis force.

From the governing equations, we can see that the cosine terms of the Coriolis force affect zonal wind (u) and vertical wind (w). The magnitude of the Coriolis force is determined by two factors: wind speed and latitude. The maximum of the cosine function happens when the latitude is zero degrees, which is at the equator. In this study, we conduct research into the effects of full-component Coriolis force in the nonhydrostatic regional spectral model (RSM) over tropical areas. Numerical experiments will be done to show the impact of the cosine terms of Coriolis force on wind field and precipitation structure. The differences in the two approaches will be compared in order to prove their relative effectiveness in climate prediction.

<< Previous Abstract | Next Abstract >>