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Jim Angell’s contributions to understanding the QBO

Jim Angell’s contributions to understanding the QBO. Jim Angell’s contributions to understanding the QBO. Jim Angell’s contributions to understanding the QBO. QBO !. discovery of QBO. discovery of QBO. Angell and Korshover 1962, 1963.

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Jim Angell’s contributions to understanding the QBO

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  1. Jim Angell’s contributions tounderstanding the QBO

  2. Jim Angell’s contributions tounderstanding the QBO

  3. Jim Angell’s contributions tounderstanding the QBO QBO !

  4. discovery of QBO

  5. discovery of QBO Angell and Korshover 1962, 1963

  6. Meridional structure of QBO from Angell and Korshover, 1963

  7. Equatorial QBO derived from radiosondes and rockets Baldwin et al., 2001

  8. Schematic of global QBO Baldwin et al., 2001

  9. Angell and Korshover (1964) coin the term ‘Quasi-Biennial Oscillation’

  10. Naming the QBO was not easy... kind-of biennial oscillation almost biennial oscillation not quite biennial oscillation somewhat biennial oscillation quasi-biennial oscillation a

  11. 50 hPa temps note out-of-phase between tropics and midlats

  12. QBO temperature signal in lower stratospherederived from regression with MSU4

  13. Snapshot of temperatures and meridional circulationassociated with the QBO February 1994 out-of-phase vertical structure note extension into winter midlats

  14. Equatorial waves and the QBO

  15. midlats power spectra subtropics tropics strong peak at 10-15 days

  16. Idealized wave-mean flow interaction in QBO Kelvin waves only propagate in background easterly winds

  17. Kelvin waves observed during easterly QBO winds zonal wind eddy power spectra

  18. QBO effects on ‘centers of action’

  19. Surface signal of QBO Baldwin et al., 2001

  20. Holton-Tan effect

  21. Holton-Tan effect (composited QBO E-W) observations 1964-1996 SKYHI simulation (48 years)

  22. Meridional structure of QBO from Angell and Korshover, 1963 evidence of Holton-Tan effect

  23. Ozone QBO

  24. out of phase between tropics and midlats

  25. Column ozone from TOMS total interannual variability QBO component

  26. Vertical structure of ozone QBO at equator 2-cell structure

  27. QBO signal in nitrogen dioxide (NO2)

  28. QBO and stratospheric water vapor

  29. stratospheric water vapor tropical tropopause temperature

  30. QBO variations in stratospheric water vapor from HALOE satellite data, 1991-2003 Deseasonalized anomalies

  31. Vertical propagation of QBO anomalies (interannual ‘tape recorder’)

  32. Stratospheric H2O anomalies are consistent with tropical tropopause temperature changes HALOE H2O anomalies tropical tropopause temperature anomalies

  33. Jim Angell’s contributions span all aspects of the QBO. * global structure and propagation * ozone * equatorial waves * coupling with troposphere * tropopause and stratospheric H2O Much of this original research is still relevant today!

  34. QBO Happy Birthday Jim!

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