Book contents
- Frontmatter
- Contents
- Contributors
- Editors' preface
- Keynote address to the 1977 Symposium SIR JAMES LIGHTHILL
- Part I The large-scale climatology of the tropical atmosphere
- 1 Teleconnections of rainfall anomalies in the tropics and subtropics
- 2 Northern summer planetary-scale monsoons during drought and normal rainfall months
- 3 The annual oscillation of the tropospheric temperature in the northern hemisphere
- 4 Summer mean energetics for standing and transient eddies in the wavenumber domain
- 5 Monitoring the monsoon outflow from geosynchronous satellite data
- 6 Predictability of monsoons
- 7 A review of general-circulation model experiments on the Indian monsoon
- 8 Simulation of the Asian summer monsoon by an 11-layer general-circulation model
- 9 Analysis of monsoonal quasi-stationary systems as revealed in a real-data prediction experiment
- 10 A model of the seasonally varying planetary-scale monsoon
- 11 Wave interactions in the equatorial atmosphere – an analytical Study
- Part II The summer monsoon over the Indian subcontinent and East Africa
- Part III The physics and dynamics of the Indian Ocean during the summer monsoon
- Part IV Some important mathematical modelling techniques
- Part V Storm surges and flood forecasting
- Index
4 - Summer mean energetics for standing and transient eddies in the wavenumber domain
Published online by Cambridge University Press: 05 November 2011
Book contents
- Frontmatter
- Contents
- Contributors
- Editors' preface
- Keynote address to the 1977 Symposium SIR JAMES LIGHTHILL
- Part I The large-scale climatology of the tropical atmosphere
- 1 Teleconnections of rainfall anomalies in the tropics and subtropics
- 2 Northern summer planetary-scale monsoons during drought and normal rainfall months
- 3 The annual oscillation of the tropospheric temperature in the northern hemisphere
- 4 Summer mean energetics for standing and transient eddies in the wavenumber domain
- 5 Monitoring the monsoon outflow from geosynchronous satellite data
- 6 Predictability of monsoons
- 7 A review of general-circulation model experiments on the Indian monsoon
- 8 Simulation of the Asian summer monsoon by an 11-layer general-circulation model
- 9 Analysis of monsoonal quasi-stationary systems as revealed in a real-data prediction experiment
- 10 A model of the seasonally varying planetary-scale monsoon
- 11 Wave interactions in the equatorial atmosphere – an analytical Study
- Part II The summer monsoon over the Indian subcontinent and East Africa
- Part III The physics and dynamics of the Indian Ocean during the summer monsoon
- Part IV Some important mathematical modelling techniques
- Part V Storm surges and flood forecasting
- Index
Summary
Energy equations, similar to those proposed by Saltzman, were applied to four specific latitudinal belts to investigate the atmospheric energetics in the wavenumber domain during three summers in 1970–2. The selected latitudinal belts are: region 1 (30.8° to 44.6° N); region 2 (14.8° to 30.8° N); region 3 (0° to 14.8° N); and region 4 (14.8° S to 0°). Energy exchanges due to wave–wave and wave–zonal mean flow interactions are important for the maintenance of eddy kinetic energy, over all regions. Almost all waves furnish their kinetic energy to zonal mean flows via wave–zonal flow interaction.
A computational model to partition kinetic energy exchanges into the standing- (summer mean) and transient-wave motions has been proposed. Planetary-scale standing waves 1 to 3, over regions 2 and 3, lose large amounts of kinetic energy to transient eddies via ‘standing to transient’ wave interactions. The majority of transient waves, over regions 2 and 4, act as a kinetic energy drain for standingwave motions.
Introduction
Scale interactions are usually defined in terms of zonal wavenumber. In such a scale resolution, the monsoon circulation can be identified as a distinct low wavenumber mode. The Fourier representation of atmospheric motion has shed much light upon the processes of generation, dissipation, and transfer of kinetic energy in and among scales of atmospheric motions in extratropical and tropical regions. Saltzman (1970) summarized the results of several studies of energy interactions in the Fourier domain, in extratropical regions where synoptic-scale baroclinic disturbances are dominant.
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- Monsoon Dynamics , pp. 65 - 80Publisher: Cambridge University PressPrint publication year: 1981
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