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Connection Between Kelvin Waves & Extratropical Wave Activity

Explore the relationship between Kelvin waves and extratropical disturbances, based on observed data & research. Analysis of wave behavior, effects of zonal flows, and theoretical considerations.

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Connection Between Kelvin Waves & Extratropical Wave Activity

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  1. Relationships between Convectively Coupled Kelvin Waves and Extratropical Wave Activity George N. Kiladis Klaus Weickmann Brant Liebmann NOAA, Physical Sciences Division Earth System Research Laboratory CIRES, University of Colorado

  2. Or:Some (as yet only partially explained) observations of Kelvin Waves and Associated Extratropical Disturbances

  3. Data Sources Cloud Archive User Services (CLAUS) Brightness Temperature 8 times daily, .5 resolution July 1983-September 2005 NCEP-NCAR Reanalysis products 4 times daily, 17 pressure levels, 2.5 resolution

  4. Key Papers: Lindzen, R. D., 1967: Planetary waves on beta-planes. Mon. Wea. Rev. Hoskins, B. J. and T. Ambrizzi 1993: Rossby wave propagation on a realistic longitudinally varying flow. J. Atmos. Sci. Zhang, C. and P. J. Webster, 1989: Effects of zonal flows on equatorially-trapped waves. J. Atmos. Sci. Zhang, C. and P. J. Webster, 1992: Laterally forced equatorial perturbations in a linear model. J. Atmos. Sci. Yang, G. –Y. and B. J. Hoskins 1996: Propagation of Rossby waves of non-zero frequency. J. Atmos. Sci. Hoskins, B. J., and G. –Y. Yang, G. –Y. 2000: The equatorial response to higher latitude forcing. J. Atmos. Sci. Roundy, P. E., 2008: Analysis of convectively coupled Kelvin waves in the Indian Ocean MJO. J. Atmos. Sci. Dias, J. and O. Pauluis, 2009: Convectively coupled Kelvin waves propagating along an ITCZ. J. Atmos. Sci. Ferguson, J., B. Khouider, M. Namazi, 2009: Two-way interactions between equatorially-trapped waves and the barotropic flow. Chinese Ann. Math.

  5. Theoretical Considerations:Effects of Meridional Shear in the Zonal Wind Differential advection leads to straining and deformation: Affects shape and group velocity Wave-guiding: Trapping of Rossby wave energy along jets, extratropical waves are guided towards low latitudes in certain regions Non-Doppler Effect: Meridional shear modifies the -effect, leading to differences in equivalent depths and equatorial trapping Critical Line: Where the zonal phase speed of a Rossby Wave equals that of the background zonal wind (waves are absorbed or perhaps reflected here).

  6. 200 hPa Climatological Zonal Wind, Dec.-Feb. 1979-2004 Contour interval 5 ms-1

  7. 200 hPa Climatological Zonal Wind, June-Aug. 1979-2004 Contour interval 5 ms-1

  8. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 10N, 150W for Dec.-Feb. 1979-2004 Day 0 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue Kiladis, 1998

  9. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 10N, 150W for Dec.-Feb. 1979-2004 Day-5 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  10. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 10N, 150W for Dec.-Feb. 1979-2004 Day-4 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  11. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 10N, 150W for Dec.-Feb. 1979-2004 Day-3 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  12. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 10N, 150W for Dec.-Feb. 1979-2004 Day-2 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  13. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 10N, 150W for Dec.-Feb. 1979-2004 Day-1 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  14. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 10N, 150W for Dec.-Feb. 1979-2004 Day 0 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  15. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 10N, 150W for Dec.-Feb. 1979-2004 Day+1 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  16. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 10N, 150W for Dec.-Feb. 1979-2004 Day+2 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  17. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 7.5N, 30W for Dec.-Feb. 1979-2004 Day-2 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue Kiladis and Weickmann, 1997

  18. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 7.5N, 30W for Dec.-Feb. 1979-2004 Day-1 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  19. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 7.5N, 30W for Dec.-Feb. 1979-2004 Day 0 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  20. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 7.5N, 30W for Dec.-Feb. 1979-2004 Day+1 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  21. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 7.5N, 30W for Dec.-Feb. 1979-2004 Day+2 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  22. OBSERVATIONS OF KELVIN AND INERTIO-GRAVITY WAVES CLAUS Brightness Temperature (2.5S–7.5N), April-May 1987

  23. OBSERVATIONS OF KELVIN AND INERTIO-GRAVITY WAVES CLAUS Brightness Temperature (2.5S–7.5N), April-May 1987 28 ms-1

  24. OLR and 850 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day+1 Geopotential Height (contours .5 m) Wind (vectors, largest around 5 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue Straub and Kiladis, 1997

  25. Kelvin Wave Theoretical Structure Wind, Pressure (contours), Divergence, blue negative

  26. OLR and 850 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day+1 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  27. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day+1 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  28. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day-6 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  29. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day-5 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  30. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day-4 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  31. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day-3 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  32. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day-2 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  33. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day-1 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  34. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day 0 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  35. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day+1 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  36. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day+2 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  37. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day+3 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  38. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day+4 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  39. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day-10 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  40. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day-9 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  41. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day-8 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  42. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day-7 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  43. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 7.5N, 172.5W for June-Aug. 1983-2005 Day-6 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  44. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at Eq., 90E for June-Aug. 1983-2005 Day 0 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  45. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at Eq., 90E for March-May 1983-2005 Day 0 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  46. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at Eq., 90E for Dec.-Jan. 1983-2005 Day 0 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  47. OLR and 200 hPa Flow Regressed against <30 day filtered OLR (scaled -20 W m2) at 7.5N, 30W for Dec.-Feb. 1979-2004 Day 0 Streamfunction (contours 5 X 105 m2 s-1) Wind (vectors, largest around 10 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  48. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 2.5N, 0.0 for March-May 1983-2005 Day-1 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

  49. OLR and 200 hPa Flow Regressed against Kelvin-filtered OLR (scaled -20 W m2) at 2.5N, 0.0 for March-May 1983-2005 Day+1 Streamfunction (contours 2 X 105 m2 s-1) Wind (vectors, largest around 2 ms-1) OLR (shading starts at +/- 6 W s-2), negative blue

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