Journal ArticleDOI
Gravity‐wave generation by thunderstorms observed with a vertically‐pointing 430 MHz radar
TLDR
In this article, the authors used the Arecibo Observatory 430 MHz Doppler radar to study the upper troposphere and lower stratosphere during thunderstorm activity in the afternoon hours, and they found that gravity wave oscillations in the vertical velocity above the tropopause would develop.Abstract:
During September of 1979, the Arecibo Observatory 430 MHz Doppler radar was used to study the upper troposphere and lower stratosphere during thunderstorm activity in the afternoon hours. It was found that when the clouds developed sufficiently in the vertical direction to reach the height of the tropopause, gravity-wave oscillations in the vertical velocity above the tropopause would develop. The amplitude was 2 m/s, and the period was close to 6 min.read more
Citations
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Journal ArticleDOI
The quasi-biennial oscillation
Mark P. Baldwin,Lesley J. Gray,Timothy J. Dunkerton,Kevin Hamilton,Peter H. Haynes,William J. Randel,James R. Holton,M. J. Alexander,Isamu Hirota,Takeshi Horinouchi,Dylan B. A. Jones,J. S. Kinnersley,C. Marquardt,Kaoru Sato,M. Takahashi +14 more
TL;DR: The quasi-biennial oscillation (QBO) as discussed by the authors dominates the variability of the equatorial stratosphere (∼16-50 km) and is easily seen as downward propagating easterly and westerly wind regimes, with a variable period averaging approximately 28 months.
Journal ArticleDOI
The Gravity Wave Response above Deep Convection in a Squall Line Simulation.
TL;DR: In this paper, a fully compressible, nonlinear, numerical, two-dimensional simulation of a midlatitude squall line was used to study vertically propagating waves generated by deep convection.
Journal ArticleDOI
Numerical Modeling of Gravity Wave Generation by Deep Tropical Convection
TL;DR: In this paper, a high-resolution numerical model of deep convection over the Tiwi Islands, Australia is presented, which explicitly resolves both the mesoscale convective cloud cluster and the gravity waves generated.
Journal ArticleDOI
A Numerical Study of Three-Dimensional Gravity Waves Triggered by Deep Tropical Convection and Their Role in the Dynamics of the QBO
TL;DR: In this paper, a 3D mesoscale model is used to study the structure of convectively triggered gravity waves in the Tropics and their role in the dynamics of the middle atmosphere.
Journal ArticleDOI
Identification of a Thunderstorm as a Source of Short Period Gravity Waves in the Upper Atmospheric Nightglow Emissions
Michael J. Taylor,Mike Hapgood +1 more
TL;DR: Taylor et al. as mentioned in this paper detected a short period gravity wave train by its effect on three upper atmospheric nightglow emissions, the OI 557.7 nm and Na 589.2 nm lines and the OH bands between 715 and 810 nm.
References
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The critical layer for internal gravity waves in a shear flow
TL;DR: In this paper, the effect of the Richardson number R on the propagation of gravity waves from the troposphere to the ionosphere is considered, and it is shown that if R is everywhere larger than 1/4, the waves are attenuated by a factor as they pass through a critical level at which U is equal to the horizontal phase speed, and momentum is transferred to the mean flow there.
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Radar Observations of Winds and Turbulence in the Stratosphere and Mesosphere.
TL;DR: In this paper, a technique for the observation of radar echoes from stratospheric and mesospheric heights has been developed at the Jicamarca Radio Observatory Signals are detected at the altitude ranges between 10-35 km and from 55-85 km with powers from many to several tens of decibels above noise level.
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Structure and dynamics of the stratosphere and mesosphere revealed by VHF radar investigations
TL;DR: In this article, the Tropopause level as well as a criterion on the stability of the lower stratosphere can be deduced from the results of radar investigations of the middle atmosphere, and the basic parameters, such as mean and fluctuating velocities, reflectivity and persistency of atmospheric structures, are defined.
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Internal Gravity Waves Generated by Penetrative Convection
TL;DR: In this paper, a series of idealized disturbances at the base of an atmospheric temperature inversion were modeled by a wave group and the internal gravity waves excited in the inversion by the disturbances were theoretically found to drain away a fraction of the initial energy of the disturbances.
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High-altitude-resolution stratospheric measurements with the Arecibo 2380-MHz radar
TL;DR: In this article, a bistatic radar was used for stratospheric turbulence research studies, which achieved a vertical resolution of 30 m by means of a novel continuous pseudorandom phase coding scheme.