scholarly journals Darwin Area Wave Experiment (DAWEX) field campaign to study gravity wave generation and propagation

2004 ◽  
Vol 109 (D20) ◽  
Author(s):  
Kevin Hamilton
Keyword(s):  
Gravity Wave ◽  
Wave Generation ◽  
Field Campaign ◽  
Wave Experiment

scholarly journals Gravity wave generation by convection and momentum deposition in the mesosphere-lower thermosphere

2013 ◽  
Vol 118 (12) ◽  
pp. 6233-6245 ◽  
Author(s):  
R. A. Vincent ◽  
M. J. Alexander ◽  
B. K. Dolman ◽  
A. D. MacKinnon ◽  
P. T. May ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Lower Thermosphere ◽  
Wave Generation

scholarly journals Atmospheric Conditions during the Deep Propagating Gravity Wave Experiment (DEEPWAVE)

2017 ◽  
Vol 145 (10) ◽  
pp. 4249-4275 ◽  
Author(s):  
Sonja Gisinger ◽  
Andreas Dörnbrack ◽  
Vivien Matthias ◽  
James D. Doyle ◽  
Stephen D. Eckermann ◽  
...  
Keyword(s):  
New Zealand ◽  
Gravity Wave ◽  
Inversion Layer ◽  
Polar Vortex ◽  
Polar Front ◽  
Atmospheric Conditions ◽  
Mountain Waves ◽  
Wave Experiment ◽  
Stratospheric Wind ◽  
Antarctic Polar Vortex

This paper describes the results of a comprehensive analysis of the atmospheric conditions during the Deep Propagating Gravity Wave Experiment (DEEPWAVE) campaign in austral winter 2014. Different datasets and diagnostics are combined to characterize the background atmosphere from the troposphere to the upper mesosphere. How weather regimes and the atmospheric state compare to climatological conditions is reported upon and how they relate to the airborne and ground-based gravity wave observations is also explored. Key results of this study are the dominance of tropospheric blocking situations and low-level southwesterly flows over New Zealand during June–August 2014. A varying tropopause inversion layer was found to be connected to varying vertical energy fluxes and is, therefore, an important feature with respect to wave reflection. The subtropical jet was frequently diverted south from its climatological position at 30°S and was most often involved in strong forcing events of mountain waves at the Southern Alps. The polar front jet was typically responsible for moderate and weak tropospheric forcing of mountain waves. The stratospheric planetary wave activity amplified in July leading to a displacement of the Antarctic polar vortex. This reduced the stratospheric wind minimum by about 10 m s−1 above New Zealand making breaking of large-amplitude gravity waves more likely. Satellite observations in the upper stratosphere revealed that orographic gravity wave variances for 2014 were largest in May–July (i.e., the period of the DEEPWAVE field phase).

The LSU Low Temperature Gravity Wave Experiment

1977 ◽  
pp. 149-159
Author(s):  
W. O. Hamilton ◽  
T. P. Bernat ◽  
D. G. Blair ◽  
W. C. Oelfke
Keyword(s):  
Low Temperature ◽  
Gravity Wave ◽  
Wave Experiment

scholarly journals High-Altitude (0–100 km) Global Atmospheric Reanalysis System: Description and Application to the 2014 Austral Winter of the Deep Propagating Gravity Wave Experiment (DEEPWAVE)

2018 ◽  
Vol 146 (8) ◽  
pp. 2639-2666 ◽  
Author(s):  
Stephen D. Eckermann ◽  
Jun Ma ◽  
Karl W. Hoppel ◽  
David D. Kuhl ◽  
Douglas R. Allen ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Lower Thermosphere ◽  
Horizontal Resolution ◽  
Austral Winter ◽  
Background Error ◽  
System Description ◽  
Wave Dynamics ◽  
Wave Experiment ◽  
Mlt Dynamics ◽  
High Horizontal Resolution

AbstractA data assimilation system (DAS) is described for global atmospheric reanalysis from 0- to 100-km altitude. We apply it to the 2014 austral winter of the Deep Propagating Gravity Wave Experiment (DEEPWAVE), an international field campaign focused on gravity wave dynamics from 0 to 100 km, where an absence of reanalysis above 60 km inhibits research. Four experiments were performed from April to September 2014 and assessed for reanalysis skill above 50 km. A four-dimensional variational (4DVAR) run specified initial background error covariances statically. A hybrid-4DVAR (HYBRID) run formed background error covariances from an 80-member forecast ensemble blended with a static estimate. Each configuration was run at low and high horizontal resolution. In addition to operational observations below 50 km, each experiment assimilated 105 observations of the mesosphere and lower thermosphere (MLT) every 6 h. While all MLT reanalyses show skill relative to independent wind and temperature measurements, HYBRID outperforms 4DVAR. MLT fields at 1-h resolution (6-h analysis and 1–5-h forecasts) outperform 6-h analysis alone due to a migrating semidiurnal (SW2) tide that dominates MLT dynamics and is temporally aliased in 6-h time series. MLT reanalyses reproduce observed SW2 winds and temperatures, including phase structures and 10–15-day amplitude vacillations. The 0–100-km reanalyses reveal quasi-stationary planetary waves splitting the stratopause jet in July over New Zealand, decaying from 50 to 80 km then reintensifying above 80 km, most likely via MLT forcing due to zonal asymmetries in stratospheric gravity wave filtering.

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