Generation of mesoscale gravity waves in upper-trophospheric jet-front systems

Fuqing Zhang

Research output: Contribution to journalArticle

174 Citations (Scopus)

Abstract

Multiply nested mesoscale numerical simulations with horizontal resolution up to 3.3 km are performed to study the generation of mesoscale gravity waves during the life cycle of idealized baroclinic jet-front systems. Long-lived vertically propagating mesoscale gravity waves with horizontal wavelengths ∼ 100-200 km are simulated originating from the exit region of the upper-tropospheric jet streak, in a manner consistent with past observational studies. The residual ofthe nonlinear balance equation is found to be a useful index in diagnosing flow imbalance and predicting wave generation. The imbalance diagnosis and model simulations suggest that balance adjustment, as a generalization of geostrophic adjustment, is likely responsible for generating these mesoscale gravity waves. It is hypothesized that, through balance adjustment, the continuous generation of flow imbalance from the developing baroclinic wave will lead to the continuous radiation of gravity waves.

Original languageEnglish (US)
Pages (from-to)440-457
Number of pages18
JournalJournal of the Atmospheric Sciences
Volume61
Issue number4
DOIs
StatePublished - Feb 15 2004

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gravity wave
baroclinic wave
wave generation
simulation
life cycle
wavelength

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

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abstract = "Multiply nested mesoscale numerical simulations with horizontal resolution up to 3.3 km are performed to study the generation of mesoscale gravity waves during the life cycle of idealized baroclinic jet-front systems. Long-lived vertically propagating mesoscale gravity waves with horizontal wavelengths ∼ 100-200 km are simulated originating from the exit region of the upper-tropospheric jet streak, in a manner consistent with past observational studies. The residual ofthe nonlinear balance equation is found to be a useful index in diagnosing flow imbalance and predicting wave generation. The imbalance diagnosis and model simulations suggest that balance adjustment, as a generalization of geostrophic adjustment, is likely responsible for generating these mesoscale gravity waves. It is hypothesized that, through balance adjustment, the continuous generation of flow imbalance from the developing baroclinic wave will lead to the continuous radiation of gravity waves.",
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Generation of mesoscale gravity waves in upper-trophospheric jet-front systems. / Zhang, Fuqing.

In: Journal of the Atmospheric Sciences, Vol. 61, No. 4, 15.02.2004, p. 440-457.

Research output: Contribution to journalArticle

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