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A modified quasigeostrophic equation for barotropic mean flow over topography

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The standard mean flow equation of quasigeostrophic theory omits the mass term in the angular momentum budget. A modification of this equation is proposed for barotropic flow over topography where the mass term is incorporated. The modified equation is applied to a topographic instability problem. It is found that the growth rates are substantially reduced if the mass term is taken into account.

In der u¨blichen Formulierung der quasigeostrophischen Theorie wird eine Gleichung fu¨r die mittlere zonale Stro¨mung benutzt, die den Massenterm in der Bilanzgleichung fu¨r den Drehimpuls vernachla¨ssigt. Es wird eine Erweiterung dieser Gleichung fu¨r den Fall einer barotropen Stro¨mung u¨ber Gebirge vorgeschlagen, bei der der Massenterm eingegliedert ist. Diese modifizierte Gleichung wird auf ein Problem der topographischen Instabilita¨t angewandt. Es zeigt sich, dass die Wachstumsraten deutlich zuru¨ckgehen, wenn der Massenterm einbezogen wird.
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Document Type: Short Communication

Publication date: 2003-01-01

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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