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ENSO and its relation to the Kelvin and Rossby Wave Eric Sinsky

ENSO and its relation to the Kelvin and Rossby Wave Eric Sinsky. Outline. Basic El Nino and La Nina dynamics The basic principles of the Kelvin Wave The basic principles of the Rossby Wave The Kelvin wave’s role in ENSO The Rossby wave’s role in ENSO

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ENSO and its relation to the Kelvin and Rossby Wave Eric Sinsky

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  1. ENSO and its relation to the Kelvin and Rossby WaveEric Sinsky

  2. Outline • Basic El Nino and La Nina dynamics • The basic principles of the Kelvin Wave • The basic principles of the Rossby Wave • The Kelvin wave’s role in ENSO • The Rossby wave’s role in ENSO • An ENSO theory involving Rossby and Kelvin waves

  3. El Nino

  4. La Nina

  5. How ENSO is quantified • ENSO is measured in SOI • Positive values signify La Nina and negative El Nino

  6. 1997-1998 El Nino

  7. Thermocline Depth

  8. Kelvin Wave • Shallow water wave ( • Small amplitude (5-10cm) • Very long wavelength and period • Non-dispersive • C ,

  9. Rossby Wave Deep water wave ( Large amplitude at thermocline (~25m) Very long wavelength (500km) Dispersive

  10. Kelvin Wave in ENSO

  11. Rossby Waves in Enso

  12. Comparing Rossby and Kelvin Waves

  13. The Delayed Oscillator

  14. Delayed oscillator applied to 97-98 El Nino

  15. References • Chelton, D. B., and M. G. Schlax, 1996: Global observations of oceanic Rossby waves. Science, vol. 272, pp. 234-238. • Knauss, John. Introduction of Physical Oceanography. Long Grove: Waveland Press, 1997. • Stewart, Robert. Introduction to Physical Oceanography. Texas A&M University, 2005. • Cipollini, Paolo. Rossby Waves: what are they? University of Southamton, 2000. • Anonymous. A Curious Pacific Wave. National Aeronautics and Space Administration Science, 2002. • Dijkstra, Henk. Nonlinear Physical Oceanography. New York: Springer-Verlag, 2005. • Laing, Arlene, and Evans, Jenni-Louise. Introduction to Tropical Meteorology. COMET® Program, 2011. • Harrison, D. E. and G. A. Vecchi (2001), El Niño and La Niña—equatorial Pacific thermocline depth and sea surface temperature anomalies, 1986–98, Geophys. Res. Lett., 28(6), 1051–1054, doi:10.1029/1999GL011307.

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