Momentum flux spectrum of convectively forced gravity waves: Can diabatic forcing be a proxy for convective forcing?

Hye-Yeong Chun, In Sun Song, Takeshi Horinouchi

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The momentum flux of convectively forced internal gravity waves is calculated using explicitly resolved model-simulated gravity wave data. The momentum flux in a control simulation with nonlinearity and cloud microphysical processes is compared with that in quasi-linear dry simulations with either diabatic forcing or nonlinear forcing. It is found that the momentum flux induced by either of these two sources is significantly different from each other and also from the momentum flux in the control simulation. This is because the spectral distribution and magnitude of each wave source are significantly different and the cancellation of the momentum flux by cross-correlation terms between the two sources cannot be included in the momentum flux by a single source. This suggests that a parameterization of convectively forced gravity waves must take into account nonlinear forcing as well as diabatic forcing in order to qualitatively and quantitatively represent the reference-level momentum flux spectrum.

Original languageEnglish
Pages (from-to)4113-4120
Number of pages8
JournalJournal of the Atmospheric Sciences
Volume62
Issue number11
DOIs
Publication statusPublished - 2005 Nov 1

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gravity wave
momentum
simulation
internal wave
nonlinearity
parameterization

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

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title = "Momentum flux spectrum of convectively forced gravity waves: Can diabatic forcing be a proxy for convective forcing?",
abstract = "The momentum flux of convectively forced internal gravity waves is calculated using explicitly resolved model-simulated gravity wave data. The momentum flux in a control simulation with nonlinearity and cloud microphysical processes is compared with that in quasi-linear dry simulations with either diabatic forcing or nonlinear forcing. It is found that the momentum flux induced by either of these two sources is significantly different from each other and also from the momentum flux in the control simulation. This is because the spectral distribution and magnitude of each wave source are significantly different and the cancellation of the momentum flux by cross-correlation terms between the two sources cannot be included in the momentum flux by a single source. This suggests that a parameterization of convectively forced gravity waves must take into account nonlinear forcing as well as diabatic forcing in order to qualitatively and quantitatively represent the reference-level momentum flux spectrum.",
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Momentum flux spectrum of convectively forced gravity waves : Can diabatic forcing be a proxy for convective forcing? / Chun, Hye-Yeong; Song, In Sun; Horinouchi, Takeshi.

In: Journal of the Atmospheric Sciences, Vol. 62, No. 11, 01.11.2005, p. 4113-4120.

Research output: Contribution to journalArticle

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AB - The momentum flux of convectively forced internal gravity waves is calculated using explicitly resolved model-simulated gravity wave data. The momentum flux in a control simulation with nonlinearity and cloud microphysical processes is compared with that in quasi-linear dry simulations with either diabatic forcing or nonlinear forcing. It is found that the momentum flux induced by either of these two sources is significantly different from each other and also from the momentum flux in the control simulation. This is because the spectral distribution and magnitude of each wave source are significantly different and the cancellation of the momentum flux by cross-correlation terms between the two sources cannot be included in the momentum flux by a single source. This suggests that a parameterization of convectively forced gravity waves must take into account nonlinear forcing as well as diabatic forcing in order to qualitatively and quantitatively represent the reference-level momentum flux spectrum.

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