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5.5 Rossby Waves

5.5 Rossby Waves. -Mechanism and Examples in the Real Atmosphere. Coriolis Effect. Ω. 2Ω. θ. z. 2Ωsinθ Planetary vorticity. θ. 2Ω. z. Coriolis Parameter. f/2Ω. f always increases northward!. S. N. B. C. A. C. A.

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5.5 Rossby Waves

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  1. 5.5 Rossby Waves -Mechanism and Examples in the Real Atmosphere

  2. Coriolis Effect Ω 2Ω θ z 2Ωsinθ Planetary vorticity θ 2Ω z

  3. Coriolis Parameter f/2Ω f always increases northward! S N

  4. B C A C A Physical interpretation of Rossby waves (vorticity waves) Assume the flow is barotropic y x B B A C

  5. Mechanism of Rossby Waves • Conservation of absolute vorticity (or more generally, conservation of potential vorticity) • Spatial variations of the background vorticity

  6. Stationary Rossby Waves Years: Nino 3.4 
1958: 1.607 
1966: 1.308 
1973: 1.639 
1983: 2.548 
1987: 1.254 
1992: 1.820 
1995: 1.013 
1998: 2.396 
2003: 1.162

  7. Synoptic-Scale Waves: 500 hPa U, V and H Short waves propagate eastward in the mid-latitudes.

  8. Tropical Easterly Waves t

  9. Tropical Easterly Waves

  10. Rossby Wave Dispersion from an Existing Tropical Cyclone Li et al. 2003

  11. Vortex-Rossby Waves in a Tropical Cyclone From Schubert et al. 1999

  12. From Schubert et al. 1999

  13. Questions: • How fast do Rossby waves propagate? Why do some waves propagate eastward and some remain stationary? • How does a local forcing induce remote response via a stationary Rossby wave train?

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