Preface | p. xv |
Fundamentals | |
Introduction | p. 1 |
Some Wave Mechanics | p. 9 |
Waves, Harmonics, and Modes | p. 11 |
Frames of Reference | p. 12 |
Wave Scales | p. 13 |
Wave Phase and Wave Speed | p. 15 |
Group Velocity | p. 18 |
Wave Dispersion | p. 22 |
The Buoyant Force | p. 22 |
The Boussinesq Approximation | p. 26 |
The Linear Theory | |
Introduction | p. 29 |
The Taylor-Goldstein Equation | p. 31 |
A Simple Solution | p. 37 |
No Background Wind Speed | p. 37 |
Constant Background Wind Speed | p. 42 |
The WKB or "Slowly Varying" Method | p. 46 |
Energetics | p. 47 |
Wave Energy | p. 47 |
Wave-Activity Conservation Laws | p. 52 |
Wave Action | p. 52 |
Pseudo-Energy and Pseudo-Momentum | p. 53 |
Mountain Waves | |
Introduction | p. 57 |
Uniform Flow Over a Surface Corrugation | p. 61 |
The Two-Dimensional Mountain | p. 67 |
The Three-Dimensional Mountain | p. 76 |
Nonorographic Gravity Waves | p. 81 |
Ducted Gravity Waves | |
Introduction | p. 87 |
Wave Reflection and Refraction at an Elevated Layer | p. 89 |
Wave Trapping, Energy Flux, and Wave Resonance | p. 96 |
Reflection at the Ground Surface | p. 98 |
Wave Ducts | p. 102 |
The Pure Temperature Duct | p. 102 |
The Pure Wind Duct | p. 105 |
Wind Spirals and Ducts | p. 109 |
Mountain Lee Waves | p. 112 |
Gravity Wave Instability and Turbulence | |
Introduction | p. 117 |
Parcel Exchange Analysis of Flow Stability | p. 118 |
Wave Instability | p. 121 |
Introduction | p. 121 |
Kelvin-Helmholtz Instability | p. 122 |
Tim Stability of Shear Flows | p. 127 |
Inflection Point Instability | p. 128 |
Instability of Stratified Shear Flows | p. 130 |
The Critical Level | p. 133 |
Neutral, Stable, and Unstable Modes | p. 140 |
Wave-Modulated Richardson Number | p. 143 |
Wave-Turbulence Coupling | p. 147 |
Jefferys' Roll-Wave Instability Mechanism | p. 151 |
Wave Stress | |
Introduction | p. 159 |
Mathematical Derivation | p. 160 |
Variation of Wave Stress with Height | p. 162 |
Mountain Wave Stress | p. 164 |
Wave Stress Over a Surface Corrugation | p. 164 |
Wave Stress Over an Isolated Two-Dimensional Mountain | p. 166 |
Wave Stress Over Three-Dimensional Objects | p. 168 |
Secondary Effects of Wave Drag | p. 174 |
Direction Forcing | p. 174 |
Lee Wave Drag Over a Two-Dimensional Mountain | p. 175 |
Momentum Flux Due to Mountain Lee Waves | p. 176 |
Gravity Waves in the Middle and Upper Atmosphere | |
Introduction | p. 181 |
Background | p. 182 |
Interia-Gravity Waves in the Middle Atmosphere | p. 187 |
Planetary Waves in the Middle Atmosphere | p. 190 |
Rossby Wave | p. 190 |
Tropical Atmosphere | p. 191 |
Vertically Propagating Rossby-Gravity Waves | p. 192 |
The Kelvin Wave | p. 193 |
Midlatitude Wave Spectra | p. 194 |
High-Frequency Waves: >> f | p. 194 |
Mid-Frequency Waves: f >> >> N | p. 195 |
Low-Frequency Range: ∼ f | p. 196 |
Modeling the Gravity Wave Fluxes in the MUA | p. 197 |
Hydrodynamic Models | p. 197 |
Ray Tracing | p. 197 |
Wave Stress Parameterization | |
Introduction | p. 201 |
Wave Breaking, Wave Saturation, and Eddy Diffusivity | p. 202 |
Wave Breaking Heights | p. 205 |
Wave-Saturation Parameterization | p. 208 |
Parameterization Methods | p. 209 |
Sawyer Method | p. 209 |
Lindzen-Holton Method | p. 209 |
Tim Palmer Method | p. 215 |
The McFarlane Method | p. 217 |
The Schoeberl Method | p. 221 |
The Terrain-Height Adjustment Scheme | p. 222 |
Saturation Limits and Other Problems | p. 226 |
Observations and Measurements of Gravity Waves | |
Introduction | p. 231 |
Ground-Based Measurements | p. 233 |
Pressure | p. 234 |
Static Pressure Ports | p. 235 |
Noise Filtering | p. 237 |
Sampling Arrays | p. 245 |
Free-Balloon Soundings | p. 249 |
Tethered Lifting Systems | p. 252 |
Superpressure Balloons | p. 253 |
Aircraft | p. 263 |
Remote Measurements | p. 264 |
Radar | p. 265 |
Doppler Radar | p. 266 |
FM-CW Radar | p. 267 |
Sodar | p. 268 |
Lidar | p. 270 |
Airglow | p. 272 |
Satellites and Global Positioning Systems | p. 274 |
Photographic Analyses | p. 274 |
Sounding Rocket | p. 274 |
GPS Radio-Occultation Sounding | p. 275 |
Microwave Limb Sounding | p. 276 |
Gravity Wave Analyses | |
Introduction | p. 279 |
Analyses of Tropospheric Gravity Waves | p. 280 |
Initial Steeps | p. 281 |
Spectral Analysis | p. 282 |
Wavelet Analysis | p. 283 |
Band-Pass Filtering | p. 288 |
Lag Analysis | p. 289 |
Cross-Correlation Lag Analysis | p. 291 |
Beamsteering | p. 293 |
Beamsteering in the Slowness Domain | p. 293 |
Beamsteering in the Frequency Domain | p. 295 |
Array Response and Examples | p. 296 |
Impedance | p. 297 |
Analysis Results | p. 299 |
Gravity Wave Analyses in the MUA | p. 303 |
Wavelet Analysis | p. 304 |
Hodograph Analysis | p. 305 |
The Hydrostatic Atmosphere | |
The Hydrostatic Approximation | p. 309 |
The Scale Height of the Isothermal Atmosphere | p. 310 |
Adiabatic Lapse Rate | p. 310 |
Potential Temperature | p. 310 |
Boussinesq Relations | p. 311 |
The Geostrophic Wind | p. 312 |
The Critical Level | p. 313 |
Convolution | p. 315 |
The Eckman Wind Spiral | p. 316 |
Numerical Methods | p. 317 |
Mountain Waves | p. 317 |
Ducted Gravity Waves | p. 320 |
Bibliography | p. 323 |
Index | p. 343 |
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