enso and its relation to the kelvin and rossby wave eric sinsky
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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 - PowerPoint PPT PresentationTRANSCRIPT
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ENSO and its relation to the Kelvin and Rossby Wave
Eric Sinsky
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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
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El Nino
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La Nina
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How ENSO is quantified• ENSO is measured in SOI• Positive values signify La Nina and negative El Nino
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1997-1998 El Nino
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Thermocline Depth
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Kelvin Wave• Shallow water wave (• Small amplitude (5-10cm)• Very long wavelength and period• Non-dispersive • C ,
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Rossby Wave• Deep water wave
(• Large amplitude
at thermocline (~25m)
• Very long wavelength (500km)
• Dispersive
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Kelvin Wave in ENSO
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Rossby Waves in Enso
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Comparing Rossby and Kelvin Waves
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The Delayed Oscillator
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Delayed oscillator applied to 97-98 El Nino
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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.