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Section 5.4 Gravity Waves PowerPoint Presentation
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Section 5.4 Gravity Waves

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Section 5.4 Gravity Waves

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  1. Section 5.4 Gravity Waves

  2. Gravity Waves • Gravity acts as the restoring force on parcels displaced from hydrostatic equilibrium. • Pure gravity exists when the fluid is stably stratified. • Two types of gravity waves: • external gravity waves: static stability is due to the density discontinuity at the interface between two fluids • internal gravity waves: static stability arises from the stable stratification, buoyancy force acts as the restoring force

  3. External Gravity Waves: Density Discontinuity Air: Small Density h’ h’ Water: Large Density

  4. Transverse Waves: Waves are oscillations (in field variables, such as velocity or pressure) that propagate in space.

  5. Surface (External) Gravity Waves

  6. Tsunami: Shallow Water Waves

  7. Gravity Waves • Gravity acts as the restoring force on parcels displaced from hydrostatic equilibrium. • Pure gravity exists when the fluid is stably stratified. • Two types of gravity waves: • external gravity waves: static stability is due to the density discontinuity at the interface between two fluids • internal gravity waves: static stability arises from the stable stratification, buoyancy force acts as the restoring force

  8. Internal Gravity Waves: Stable Stratification Colder than the env.; Downward acc. Warmer than the env.; Upward acc.

  9. Vertical Velocity (w) Field During a Model Initial Adjustment Periods

  10. Internal Gravity Waves Generated by Rapidly Rising Deep Convection

  11. Mountain Waves and Clouds

  12. Lenticular Cloud