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# Semigeostrophic theory as a Dirac-bracket projection

@inproceedings{Salmon2005SemigeostrophicTA, title={Semigeostrophic theory as a Dirac-bracket projection}, author={R. Salmon}, year={2005} }

- Published 2005

This paper presents a general method for deriving approximate dynamical equations that satisfy a prescribed constraint typically chosen to filter out unwanted highfrequency motions. The approximate equations take a simple general form in arbitrary phase-space coordinates. The family of semigeostrophic equations for rapidly rotating flow derived by Salmon (1983, 1985) fits this general form when the chosen constraint is geostrophic balance. More precisely, the semigeostrophic equations are… CONTINUE READING

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