A Mesoscale Gravity-Wave Event Observed during CCOPE. Part IV: Stability Analysis and Doppler-derived Wave Vertical Structure

Koch, Steven E.; Einaudi, Franco; Dorian, Paul B.; Lang, S.; Heymsfield, Gerald M.

doi:10.1175/1520-0493(1993)121<2483:amgweo>2.0.co;2

Cited by 28 publications

(17 citation statements)

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“…A rigorous analytical derivation of the spectrum of gravity waves available to the atmospheric conditions existing in our case is beyond the scope of our study. However, we judge the proposed mechanism more suitable to the present case than others based on a mixture of dynamic and thermal requirements, such as a prescribed minimum thickness of the wave duct, the existence of a conditionally unstable layer capping the duct, interactions with critical levels, concurrence of certain synoptic patterns at surface and upper atmospheric levels, and so on (Eom 1975;Lindzen and Tung 1976;Uccellini and Koch 1987;Koch et al 1993;Koch and O'Handley 1997;Koch and Saleeby 2001).…”

Section: The Wave Ductmentioning

confidence: 93%

Propagation and Effects of a Mesoscale Gravity Wave Over a Weakly-Stratified Nocturnal Boundary Layer During the SABLES2006 Field Campaign

Viana

Yagüe

Maqueda

2009

Boundary-Layer Meteorol

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During the SABLES2006 (Stable Atmospheric Boundary Layer Experiment in Spain 2006) field campaign, a gravity-wave episode was observed on the night of July 11 by the microbarometers deployed at the surface and on the 100-m tower. The high-amplitude, low-frequency periodic pressure fluctuations were very well correlated with the wind speed and direction. Data from neighbouring automatic stations showed that the gravity wave was not local, but long-lived and mesoscale. The propagation of the wave over the experimental site had significant effects on the structure of the weakly-stratified nocturnal boundary layer that developed that night: the stability increased, turbulent vertical motions were suppressed, the nocturnal low-level jet was disrupted, and periodic temperature fluctuations of amplitude up to 3-4 K were observed. In this work we analyse the different available data sources (tower data, RASS-SODAR, microbarometric, satellite imagery, automatic stations) to describe the phenomena in depth and to find a suitable explanation for the generation and propagation of the wave. The linear wave theory explains remarkably well most of the observations, and the wave parameters could be estimated by applying a wavelet-based technique to surface microbarometric measurements. We also analyse the vertical structure of the wave and find wave ducting conditions above the surface. Finally, by means of the multi-resolution flux decomposition, we analyse in detail the changes in vertical turbulent fluxes and the spectra of turbulent motions produced by the interaction between the gravity wave and the local flow.

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Section: The Wave Ductmentioning

confidence: 93%

Propagation and Effects of a Mesoscale Gravity Wave Over a Weakly-Stratified Nocturnal Boundary Layer During the SABLES2006 Field Campaign

Viana

Yagüe

Maqueda

2009

Boundary-Layer Meteorol

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“…According to Koch et al [1993] these are periodic wave trains or single solitary-like wave disturbances. They state that mesoscale gravity waves are increasingly recognized for their ability to modulate cloud and precipitation fields, to produce and interact with deep convection and turbulence and to transport energy horizontally.…”

Section: Vorticesmentioning

confidence: 99%

Sudden changes in aerosol and gas concentrations in the central Arctic marine boundary layer: Causes and consequences

Bigg¹,

Leck²,

Nilsson³

2001

J. Geophys. Res.

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“…() and Koch et al . () the reference mode does not correspond to a maximum of the growth rate, and the wave growth rate is very low, about 100 times lower than in the two cases analysed by Koch et al . ().…”

Section: Shear Instability and Discussionmentioning

confidence: 99%

“…() and Koch et al . (). Functional fits to vertical profiles of background temperature

\overset{true‾}{T} (z)

and wind‐velocity component along the direction of propagation

\overset{true‾}{u} (z)

were created through the linear combination of hyperbolic tangent and Gaussian functions to fit the sounding data in a least‐squares sense and force a constant, uniform wind layer at the top of the integration domain in order to impose the radiation boundary condition.…”

Section: Shear Instability and Discussionmentioning

confidence: 99%

“…() the reference mode does not correspond to a maximum of the growth rate, and the wave growth rate is very low, about 100 times lower than in the two cases analysed by Koch et al . (). This is not unusual in atmospheric flows since the excitation of a particular mode may depend on a number of factors difficult to assess, such as horizontal inhomogeneities (at the longitude of the TRI_VAL station the distance between the Alps ridge at north and the Apennines ridge at south, i.e.…”

Section: Shear Instability and Discussionmentioning

confidence: 99%

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Modulation of precipitation by a mesoscale gravity wave in northern Italy: Detection and analysis

Manfrin

Ferrarese

Campistron

et al. 2019

Quart J Royal Meteoro Soc

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A 6 h event of increased and gravity‐wave modulated stratiform rain with a period of approximately 1 h is described and two wave generation mechanisms (geostrophic adjustment and shear instability) are investigated. The predictions of a linear stability analysis of the flow (an unstable mode of about 100 km wavelength originating from the shear instability of the tropospheric jet and propagating in a duct encompassing almost the entire troposphere) are shown to agree very well with the measurements from a microbarometer network and wind‐profiler soundings.

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A Mesoscale Gravity-Wave Event Observed during CCOPE. Part IV: Stability Analysis and Doppler-derived Wave Vertical Structure

Cited by 28 publications

References 0 publications

Propagation and Effects of a Mesoscale Gravity Wave Over a Weakly-Stratified Nocturnal Boundary Layer During the SABLES2006 Field Campaign

Propagation and Effects of a Mesoscale Gravity Wave Over a Weakly-Stratified Nocturnal Boundary Layer During the SABLES2006 Field Campaign

Sudden changes in aerosol and gas concentrations in the central Arctic marine boundary layer: Causes and consequences

Modulation of precipitation by a mesoscale gravity wave in northern Italy: Detection and analysis

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