scholarly journals Simulations of gravity wave-induced variations of the OH(8,3), O2(0,1), and O(1S) airglow emissions in the MLT region

2014 ◽  
Vol 119 (3) ◽  
pp. 2149-2159 ◽  
Author(s):  
Tai-Yin Huang ◽  
Richard George
Keyword(s):  
Gravity Wave ◽  
Airglow Emissions ◽  
Wave Induced ◽  
Mlt Region

scholarly journals Comparison of theories for gravity wave induced fluctuations in airglow emissions

1994 ◽  
Vol 99 (A3) ◽  
pp. 3935 ◽  
Author(s):  
R. L. Walterscheid ◽  
G. Schubert ◽  
M. P. Hickey
Keyword(s):  
Gravity Wave ◽  
Airglow Emissions ◽  
Wave Induced

The Momentum Budget in the Stratosphere, Mesosphere, and Lower Thermosphere. Part II: The In Situ Generation of Gravity Waves

2018 ◽  
Vol 75 (10) ◽  
pp. 3635-3651 ◽  
Author(s):  
Ryosuke Yasui ◽  
Kaoru Sato ◽  
Yasunobu Miyoshi
Keyword(s):  
Gravity Wave ◽  
Gravity Waves ◽  
Lower Thermosphere ◽  
Shear Instability ◽  
Wave Forcing ◽  
Momentum Budget ◽  
Mesosphere And Lower Thermosphere ◽  
In Situ Generation ◽  
Mlt Region

The contributions of gravity waves to the momentum budget in the mesosphere and lower thermosphere (MLT) is examined using simulation data from the Ground-to-Topside Model of Atmosphere and Ionosphere for Aeronomy (GAIA) whole-atmosphere model. Regardless of the relatively coarse model resolution, gravity waves appear in the MLT region. The resolved gravity waves largely contribute to the MLT momentum budget. A pair of positive and negative Eliassen–Palm flux divergences of the resolved gravity waves are observed in the summer MLT region, suggesting that the resolved gravity waves are likely in situ generated in the MLT region. In the summer MLT region, the mean zonal winds have a strong vertical shear that is likely formed by parameterized gravity wave forcing. The Richardson number sometimes becomes less than a quarter in the strong-shear region, suggesting that the resolved gravity waves are generated by shear instability. In addition, shear instability occurs in the low (middle) latitudes of the summer (winter) MLT region and is associated with diurnal (semidiurnal) migrating tides. Resolved gravity waves are also radiated from these regions. In Part I of this paper, it was shown that Rossby waves in the MLT region are also radiated by the barotropic and/or baroclinic instability formed by parameterized gravity wave forcing. These results strongly suggest that the forcing by gravity waves originating from the lower atmosphere causes the barotropic/baroclinic and shear instabilities in the mesosphere that, respectively, generate Rossby and gravity waves and suggest that the in situ generation and dissipation of these waves play important roles in the momentum budget of the MLT region.

scholarly journals Evaluation of methods for gravity wave extraction from middle-atmospheric lidar temperature measurements

2015 ◽  
Vol 8 (11) ◽  
pp. 4645-4655 ◽  
Author(s):  
B. Ehard ◽  
B. Kaifler ◽  
N. Kaifler ◽  
M. Rapp
Keyword(s):  
Gravity Wave ◽  
Gravity Waves ◽  
Spectral Response ◽  
Synthetic Data ◽  
Temperature Measurements ◽  
Data Set ◽  
Wide Range ◽  
Lidar Measurements ◽  
Background Temperature ◽  
Wave Induced

Abstract. This study evaluates commonly used methods of extracting gravity-wave-induced temperature perturbations from lidar measurements. The spectral response of these methods is characterized with the help of a synthetic data set with known temperature perturbations added to a realistic background temperature profile. The simulations are carried out with the background temperature being either constant or varying in time to evaluate the sensitivity to temperature perturbations not caused by gravity waves. The different methods are applied to lidar measurements over New Zealand, and the performance of the algorithms is evaluated. We find that the Butterworth filter performs best if gravity waves over a wide range of periods are to be extracted from lidar temperature measurements. The running mean method gives good results if only gravity waves with short periods are to be analyzed.

Gravity wave-induced variability of the middle thermosphere

2016 ◽  
Vol 121 (7) ◽  
pp. 6914-6923 ◽  
Author(s):  
Jeffrey M. Forbes ◽  
Sean L. Bruinsma ◽  
Eelco Doornbos ◽  
Xiaoli Zhang
Keyword(s):  
Gravity Wave ◽  
Wave Induced

A case study of A mesoscale gravity wave in the MLT region using simultaneous multi-instruments in Beijing

2016 ◽  
Vol 140 ◽  
pp. 1-9 ◽  
Author(s):  
Mingjiao Jia ◽  
Xianghui Xue ◽  
Xiankang Dou ◽  
Yihuan Tang ◽  
Chao Yu ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Mlt Region
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