Thunderstorm-Generated Gravity Waves

Curry, Michael J.; Murty, R. C.

doi:10.1175/1520-0469(1974)031<1402:tggw>2.0.co;2

Cited by 52 publications

(21 citation statements)

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“…These processes include vertical shear instability (Mastrantonio et al, 1976;Bosart and Sanders, 1986), ageostrophic adjustment associated with unbalanced flow (Zack and Kaplan, 1987;Koch and Dorian, 1988), intense convection (Curry andMurty, 1974, Raymond, 1983), and terrain effects (Kaplan and Karyampudi, 1992;Zulicke and Peters, 2006). Here, the squall line developed in the provinces of Anhui and Jiangsu, where the topography is flat; thus, the terrain effect can be excluded.…”

Section: Generation Of Gravity Wavesmentioning

confidence: 99%

Analysis of the structure and propagation of a simulated squall line on 14 June 2009

2015

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A squall line on 14 June 2009 in the provinces of Jiangsu and Anhui was well simulated using the Advanced Regional Prediction System (ARPS) model. Based on high resolution spatial and temporal data, a detailed analysis of the structural features and propagation mechanisms of the squall line was conducted. The dynamic and thermodynamic structural characteristics and their causes were analyzed in detail. Unbalanced flows were found to play a key role in initiating gravity waves during the squall line's development. The spread and development of the gravity waves were sustained by convection in the wave-CISK process. The squall line's propagation and development mainly relied on the combined effect of gravity waves at the midlevel and cold outflow along the gust front. New cells were continuously forced by the cold pool outflow and were enhanced and lifted by the intense upward motion. At a particular phase, the new cells merged with the updraft of the gravity waves, leading to an intense updraft that strengthened the squall line.

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Section: Generation Of Gravity Wavesmentioning

confidence: 99%

Analysis of the structure and propagation of a simulated squall line on 14 June 2009

2015

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“…Such waves were associated to the leading edge of the storms. At larger periods from 10 to 20 min, gravity waves characterized by frequencies lower than the Brunt Väisälä period were also observed by microbarometers up to distances of hundreds of kilometers from thunderstorm regions in relation with convection [ Curry and Murty , ]. Gratchev et al .…”

Section: Introductionmentioning

confidence: 99%

Ten year observations of gravity waves from thunderstorms in western Africa

et al. 2014

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A new study of gravity waves produced by thunderstorms was performed using continuous recordings at the IS17 (Ivory Coast) infrasound station of the International Monitoring System developed for the verification of the Comprehensive Nuclear Test-Ban Treaty. A typical case study is presented for a large thunderstorm on 10-11 April 2006 lasting near 14 h. Comparison with cloud temperature measured by the Meteosat 6 satellite shows that wave activity is large when the cloud temperature is low inside convection cells located over the station. Statistics based on 10 year data show that the wave activity is intense throughout the year with peak periods in May and October and less intense activity in January, in good agreement with the local keraunic level. The seasonal variations of the wave azimuth highlight clear trends from northward direction from February to August to southward direction from August to December. Lightning flashes, observed from space, show a similar motion confirming that thunderstorms are the main sources of the gravity wave activity. The gravity wave azimuth follows the seasonal motion of the tropical rain belt partly related to the Intertropical Convergence Zone of the winds. The contribution of other possible sources, such as wind over relief, is weak because surface winds are weak in this region and only oceans are present south of the station. We conclude that the large observed wave activity is mainly produced by convection associated to thunderstorms.

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“…The rapid destruction of the stable PBL due to internal gravity waves generated by distant thunderstorms has been documented by Curry and Murty (1974), Uccellini (1975), Balachandran (1980), Shreffler and Binkowski (1981), and Doviak and Ge (1984). The observations generally show gravity waves with amplitudes of 1 to 2 mb, wavelengths of several hundred kilometers, and phase velocities between 25 and50ms-'.…”

Section: Introductionmentioning

confidence: 99%

Sporadic breakdowns of stability in the PBL over simple and complex terrain

Nappo

1991

Boundary-Layer Meteorol

129

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Breakdowns of stability in the PBL are examined using one-minute average horizontal wind speeds and temperatures observed over many nights at stations located in simple and complex terrain. The analysis is based on the temporal behavior of the wind speed-temperature covariance, which is obtained by digital bandpass filtering. It is shown that breakdowns are a common feature of the stable PBL over both simple and complex environments. Vertical fluxes of heat during breakdowns are estimated to be a significant fraction of the nighttime average heat flux. It is hypothesized that a major portion of the nighttime vertical transfer of heat, momentum, and atmospheric pollutants occurs during periods of stability breakdowns.

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Thunderstorm-Generated Gravity Waves

Cited by 52 publications

References 0 publications

Analysis of the structure and propagation of a simulated squall line on 14 June 2009

Analysis of the structure and propagation of a simulated squall line on 14 June 2009

Ten year observations of gravity waves from thunderstorms in western Africa

Sporadic breakdowns of stability in the PBL over simple and complex terrain

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