On the Theory of Large Scale Nearly Horizontal Motions in the Atmosphere
On the Theory of Large Scale Nearly Horizontal Motions in the Atmosphere
G K Morikawa
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„(i), |... A)|_j(^. K2„ (lid) - (U - K.^U)\1/ = 0, yy ^ '^x From the viewpoint of studying the validity of the geostrophic conservation equation in describing atmospheric motions, we discuss three possible approaches: 1) numerical method, 2) linearization, and 3) atmospheric point vortices. 1) Numerical Methodc^'^ A problem of primary interest to meteorologists is that of vjeather prediction. For example from weather data at a given time over a region, say the United States, we wish to predict ...its motion there for some later time. If i-re desire a prediction over the entire region '■'-. I >n: •• ■ ''"^ . :>■ f'lY ;, i? i. Ji 22. we must also give some data continuously (t > 0) at the bound- aries of the region. Thus, we consider initial and initial- boundary value type problems for the equations (lla, b, c) by finite differences. The conservation form of equation (11a) suggests what are reasonable conditions (data) and a compu- tational procedure. For the initial value problem in the entire x-y plane we prescribe ^{x, j, 0) (or h^ (x, y, 0))o Then for T = 0, \-ie can calculate at each grid point the velocity (u^ f^ ), giving us the initial slope of the particle path in (Xjy^T) space, and {/\ - k )^, which is conserved along the particle path according to equation (11a) e We can now calculate the distribution P(x, y), say, of {/\ - K )\]/ at grid points after a time step /\^ %, limited by /^t v^^) is given by the initial distribution of (u^-'-^, v^-'-M.
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