Two types of wave breaking in an aquaplanet GCM

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Abstract

The characteristics of two distinct types of wave breaking in an aquaplanet general circulation model (GCM) are described. A systematic analysis of wave breaking is possible because when a baroclinic wave packet is present, the wave breaking tends to occur in the vicinity of the packet center. Although the refractive index is strictly valid only for linear, quasigeostrophic flows, in this GCM the refractive index is shown to be useful for categorizing two types of wave breaking. Empirical orthogonal function (EOF) analysis is performed using the refractive index obtained (by averaging over one carrier wavelength) at the center of the wave packet. Composite Eliassen-Palm fluxes and upper-level potential vorticity, corresponding to either phase of the first EOF of the refractive index, are consistent with the two types of wave breaking. It is found that the strength of the meridional shear in the upper troposphere is related to the type of wave breaking. Implications of these results for storm track variability in the atmosphere are also discussed.

Original languageEnglish (US)
Pages (from-to)842-857
Number of pages16
JournalJournal of the Atmospheric Sciences
Volume53
Issue number6
DOIs
StatePublished - Mar 15 1996

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wave breaking
general circulation model
refractive index
baroclinic wave
storm track
potential vorticity
troposphere
wavelength
atmosphere

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

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title = "Two types of wave breaking in an aquaplanet GCM",
abstract = "The characteristics of two distinct types of wave breaking in an aquaplanet general circulation model (GCM) are described. A systematic analysis of wave breaking is possible because when a baroclinic wave packet is present, the wave breaking tends to occur in the vicinity of the packet center. Although the refractive index is strictly valid only for linear, quasigeostrophic flows, in this GCM the refractive index is shown to be useful for categorizing two types of wave breaking. Empirical orthogonal function (EOF) analysis is performed using the refractive index obtained (by averaging over one carrier wavelength) at the center of the wave packet. Composite Eliassen-Palm fluxes and upper-level potential vorticity, corresponding to either phase of the first EOF of the refractive index, are consistent with the two types of wave breaking. It is found that the strength of the meridional shear in the upper troposphere is related to the type of wave breaking. Implications of these results for storm track variability in the atmosphere are also discussed.",
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Two types of wave breaking in an aquaplanet GCM. / Lee, Sukyoung; Feldstein, Steven B.

In: Journal of the Atmospheric Sciences, Vol. 53, No. 6, 15.03.1996, p. 842-857.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Feldstein, Steven B.

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AB - The characteristics of two distinct types of wave breaking in an aquaplanet general circulation model (GCM) are described. A systematic analysis of wave breaking is possible because when a baroclinic wave packet is present, the wave breaking tends to occur in the vicinity of the packet center. Although the refractive index is strictly valid only for linear, quasigeostrophic flows, in this GCM the refractive index is shown to be useful for categorizing two types of wave breaking. Empirical orthogonal function (EOF) analysis is performed using the refractive index obtained (by averaging over one carrier wavelength) at the center of the wave packet. Composite Eliassen-Palm fluxes and upper-level potential vorticity, corresponding to either phase of the first EOF of the refractive index, are consistent with the two types of wave breaking. It is found that the strength of the meridional shear in the upper troposphere is related to the type of wave breaking. Implications of these results for storm track variability in the atmosphere are also discussed.

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