scholarly journals Large‐Amplitude Mountain Waves in the Mesosphere Observed on 21 June 2014 During DEEPWAVE: 2. Nonlinear Dynamics, Wave Breaking, and Instabilities

2019 ◽  
Vol 124 (17-18) ◽  
pp. 10006-10032 ◽  
Author(s):  
David C. Fritts ◽  
Ling Wang ◽  
Michael J. Taylor ◽  
Pierre‐Dominique Pautet ◽  
Neal R. Criddle ◽  
...  
Keyword(s):  
Nonlinear Dynamics ◽  
Wave Breaking ◽  
Large Amplitude ◽  
Mountain Waves

The Interaction of Katabatic Flow and Mountain Waves. Part II: Case Study Analysis and Conceptual Model

2007 ◽  
Vol 64 (6) ◽  
pp. 1857-1879 ◽  
Author(s):  
Gregory S. Poulos ◽  
James E. Bossert ◽  
Thomas B. McKee ◽  
Roger A. Pielke
Keyword(s):  
Conceptual Model ◽  
Gravity Wave ◽  
Wave Breaking ◽  
Gradient Force ◽  
Pressure Gradient Force ◽  
Wave System ◽  
Katabatic Flow ◽  
Mountain Wave ◽  
Mountain Waves ◽  
Wave Evolution

Via numerical analysis of detailed simulations of an early September 1993 case night, the authors develop a conceptual model of the interaction of katabatic flow in the nocturnal boundary layer with mountain waves (MKI). A companion paper (Part I) describes the synoptic and mesoscale observations of the case night from the Atmospheric Studies in Complex Terrain (ASCOT) experiment and idealized numerical simulations that manifest components of the conceptual model of MKI presented herein. The reader is also referred to Part I for detailed scientific background and motivation. The interaction of these phenomena is complicated and nonlinear since the amplitude, wavelength, and vertical structure of the mountain-wave system developed by flow over the barrier owes some portion of its morphology to the evolving atmospheric stability in which the drainage flows develop. Simultaneously, katabatic flows are impacted by the topographically induced gravity wave evolution, which may include significantly changing wavelength, amplitude, flow magnitude, and wave breaking behavior. In addition to effects caused by turbulence (including scouring), perturbations to the leeside gravity wave structure at altitudes physically distant from the surface-based katabatic flow layer can be reflected in the katabatic flow by transmission through the atmospheric column. The simulations show that the evolution of atmospheric structure aloft can create local variability in the surface pressure gradient force governing katabatic flow. Variability is found to occur on two scales, on the meso-β due to evolution of the mountain-wave system on the order of one hour, and on the microscale due to rapid wave evolution (short wavelength) and wave breaking–induced fluctuations. It is proposed that the MKI mechanism explains a portion of the variability in observational records of katabatic flow.

scholarly journals The Intense Lee-Wave Rotor Event of Sierra Rotors IOP 8

2007 ◽  
Vol 64 (12) ◽  
pp. 4178-4201 ◽  
Author(s):  
Vanda Grubišić ◽  
Brian J. Billings
Keyword(s):  
Sierra Nevada ◽  
Large Amplitude ◽  
Forced Flow ◽  
Mountain Range ◽  
Wave Rotor ◽  
Owens Valley ◽  
Mountain Waves ◽  
Downslope Wind ◽  
Lee Wave ◽  
Strong Control

Abstract A large-amplitude lee-wave rotor event observationally documented during Sierra Rotors Project Intensive Observing Period (IOP) 8 on 24–26 March 2004 in the lee of the southern Sierra Nevada is examined. Mountain waves and rotors occurred over Owens Valley in a pre-cold-frontal environment. In this study, the evolution and structure of the observed and numerically simulated mountain waves and rotors during the event on 25 March, in which the horizontal circulation associated with the rotor was observed as an opposing, easterly flow by the mesonetwork of surface stations in Owens Valley, are analyzed. The high-resolution numerical simulations of this case, performed with the Coupled Ocean–Atmosphere Mesoscale Prediction System (COAMPS) run with multiple nested-grid domains, the finest grid having 333-m horizontal spacing, reproduced many of the observed features of this event. These include small-amplitude waves above the Sierra ridge decoupled from thermally forced flow within the valley, and a large-amplitude mountain wave, turbulent rotor, and strong westerlies on the Sierra Nevada lee slopes during the period of the observed surface easterly flow. The sequence of the observed and simulated events shows a pronounced diurnal variation with the maximum wave and rotor activity occurring in the early evening hours during both days of IOP 8. The lee-wave response, and thus indirectly the appearance of lee-wave rotor during the core IOP 8 period, is found to be strongly controlled by temporal changes in the upstream ambient wind and stability profiles. The downstream mountain range exerts strong control over the lee-wave horizontal wavelength during the strongest part of this event, thus exhibiting the control over the cross-valley position of the rotor and the degree of strong downslope wind penetration into the valley.

Phase mixing/wave breaking studies of large amplitude oscillations in a cold homogeneous unmagnetized plasma

2011 ◽  
Vol 53 (7) ◽  
pp. 074014 ◽  
Author(s):  
Sudip Sengupta ◽  
Predhiman Kaw ◽  
Vikrant Saxena ◽  
Abhijit Sen ◽  
Amita Das
Keyword(s):  
Wave Breaking ◽  
Large Amplitude ◽  
Phase Mixing ◽  
Unmagnetized Plasma

scholarly journals Nonlinear dynamics of large amplitude modes in a magnetized plasma

2014 ◽  
Vol 21 (12) ◽  
pp. 122301 ◽  
Author(s):  
G. Brodin ◽  
L. Stenflo
Keyword(s):  
Nonlinear Dynamics ◽  
Large Amplitude ◽  
Magnetized Plasma

Theory of mountain waves of large amplitude

1959 ◽  
Vol 85 (364) ◽  
pp. 131-143 ◽  
Author(s):  
R. S. Scorer ◽  
H. Klieforth
Keyword(s):  
Large Amplitude ◽  
Mountain Waves

scholarly journals Lidar observations of large-amplitude mountain waves in the stratosphere above Tierra del Fuego, Argentina

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
N. Kaifler ◽  
B. Kaifler ◽  
A. Dörnbrack ◽  
M. Rapp ◽  
J. L. Hormaechea ◽  
...  
Keyword(s):  
Large Amplitude ◽  
Tierra Del Fuego ◽  
Mountain Waves ◽  
Lidar Observations

scholarly journals Large‐Amplitude Mountain Waves in the Mesosphere Observed on 21 June 2014 During DEEPWAVE: 1. Wave Development, Scales, Momentum Fluxes, and Environmental Sensitivity

2019 ◽  
Vol 124 (19) ◽  
pp. 10364-10384 ◽  
Author(s):  
Michael J. Taylor ◽  
Pierre‐Dominique Pautet ◽  
David C. Fritts ◽  
Bernd Kaifler ◽  
Steven M. Smith ◽  
...  
Keyword(s):  
Large Amplitude ◽  
Environmental Sensitivity ◽  
Mountain Waves ◽  
Momentum Fluxes ◽  
Wave Development
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