1 / 14

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.

elvis
Download Presentation

5.5 Rossby Waves

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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?

More Related