The vortical response to penetrative convection and the associated gravity-wave generation

2008 ◽  
Vol 9 (3) ◽  
pp. 103-110 ◽  
Author(s):  
Todd P. Lane
Keyword(s):  
Gravity Wave ◽  
Wave Generation ◽  
Penetrative Convection

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 Exponential Smallness of Inertia–Gravity Wave Generation at Small Rossby Number

2008 ◽  
Vol 65 (5) ◽  
pp. 1622-1637 ◽  
Author(s):  
J. Vanneste
Keyword(s):  
Gravity Wave ◽  
Gravity Waves ◽  
Initial Conditions ◽  
Wave Generation ◽  
Rossby Number ◽  
Spontaneous Generation ◽  
Steady Flows ◽  
Generation Mechanisms ◽  
Inertia Gravity Waves ◽  
Exponentially Small

Abstract This paper discusses some of the mechanisms whereby fast inertia–gravity waves can be generated spontaneously by slow, balanced atmospheric and oceanic flows. In the small Rossby number regime relevant to midlatitude dynamics, high-accuracy balanced models, which filter out inertia–gravity waves completely, can in principle describe the evolution of suitably initialized flows up to terms that are exponentially small in the Rossby number ɛ, that is, of the form exp(−α/ɛ) for some α > 0. This suggests that the mechanisms of inertia–gravity wave generation, which are not captured by these balanced models, are also exponentially weak. This has been confirmed by explicit analytical results obtained for a few highly simplified models. These results are reviewed, and some of the exponential-asymptotic techniques that have been used in their derivation are presented. Two types of mechanisms are examined: spontaneous-generation mechanisms, which generate exponentially small waves from perfectly balanced initial conditions, and unbalanced instability mechanisms, which amplify unbalanced initial perturbations of steady flows. The relevance of the results to realistic flows is discussed.

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