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The Scale of Atmospheric Motions and the Effect of Topography on Numerical Weather Prediction in the Lower Atmosphere

1957; Volume: 8; Issue: 1 Linguagem: Inglês

10.2467/mripapers1950.8.1_1

1880-6643

K. Gambo,

Climate variability and models

In the first part of this paper, the orders in magnitude of each term in the vorticity equation, the divergence equation and the equation of the vertical p-velocity are discussed as functions of the Rossby-number. As the first approximation of such equations, the quasi-geostrophic approximation is used. The second approximation is also discussed in connection with the balance equation.In this case it is to be emphasized that the most important problem is how to filter out the meteorologically unimportant " noise " of disturbances. In the second part of this paper, the effect of topography on the height change with time in the lower atmosphere is considered from the point of view of scale-quantity. The vertical p-velocity due to the effect of topography is divided into two parts: one is the largescale pattern which contributes to the height change with time in the lower atmosphere and the other is the small-scale pattern which contributes only to the precipitation without changing the pressure pattern on the earth's surface.In the last part of this paper, these theoretical results are compared in good agreements with the observed pressure change with time on the earth's surface.