Spectral integration of a hemispheric barotropic model
Keywords:barotropic model, wave spectrum, earth's surface
A barotropic model for the northern hemisphere is integrated by decomposing the basic horizontal field into a low-order wave spectrum. The spectral representation is in terms of surface spherical harmonics, which takes into account sphericity of the earth's surface in a natural way. The initial input for the model is the stream function spectrum derived from geopotential spectrum through linear balance wind relationship. Inclusion of appropriate amount of divergence in an empirical way improves the overall performance of the model. The performance of the model in relation to persistence is discussed.
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