Inertia–Gravity Waves Spontaneously Generated by Jets and Fronts. Part I: Different Baroclinic Life Cycles
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- Riwal Plougonven
- School of Mathematics and Statistics, University of St Andrews, St Andrews, United Kingdom
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- Chris Snyder
- National Center for Atmospheric Research, Boulder, Colorado
書誌事項
- 公開日
- 2007-07-01
- DOI
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- 10.1175/jas3953.1
- 公開者
- American Meteorological Society
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説明
<jats:title>Abstract</jats:title> <jats:p>The spontaneous generation of inertia–gravity waves in idealized life cycles of baroclinic instability is investigated using the Weather Research and Forecasting Model. Two substantially different life cycles of baroclinic instability are obtained by varying the initial zonal jet. The wave generation depends strongly on the details of the baroclinic wave’s development. In the life cycle dominated by cyclonic behavior, the most conspicuous gravity waves are excited by the upper-level jet and are broadly consistent with previous simulations of O’Sullivan and Dunkerton. In the life cycle that is dominated by anticyclonic behavior, the most conspicuous gravity waves even in the stratosphere are excited by the surface fronts, although the fronts are no stronger than in the cyclonic life cycle. The anticyclonic life cycle also reveals waves in the lower stratosphere above the upper-level trough of the baroclinic wave; these waves have not been previously identified in idealized simulations. The sensitivities of the different waves to both resolution and dissipation are discussed.</jats:p>
収録刊行物
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- Journal of the Atmospheric Sciences
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Journal of the Atmospheric Sciences 64 (7), 2502-2520, 2007-07-01
American Meteorological Society
