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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. QBO !. discovery of QBO. discovery of QBO. Angell and Korshover 1962, 1963.
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discovery of QBO
discovery of QBO Angell and Korshover 1962, 1963
Equatorial QBO derived from radiosondes and rockets Baldwin et al., 2001
Schematic of global QBO Baldwin et al., 2001
Angell and Korshover (1964) coin the term ‘Quasi-Biennial Oscillation’
Naming the QBO was not easy... kind-of biennial oscillation almost biennial oscillation not quite biennial oscillation somewhat biennial oscillation quasi-biennial oscillation a
50 hPa temps note out-of-phase between tropics and midlats
QBO temperature signal in lower stratospherederived from regression with MSU4
Snapshot of temperatures and meridional circulationassociated with the QBO February 1994 out-of-phase vertical structure note extension into winter midlats
Equatorial waves and the QBO
midlats power spectra subtropics tropics strong peak at 10-15 days
Idealized wave-mean flow interaction in QBO Kelvin waves only propagate in background easterly winds
Kelvin waves observed during easterly QBO winds zonal wind eddy power spectra
Surface signal of QBO Baldwin et al., 2001
Holton-Tan effect (composited QBO E-W) observations 1964-1996 SKYHI simulation (48 years)
Meridional structure of QBO from Angell and Korshover, 1963 evidence of Holton-Tan effect
out of phase between tropics and midlats
Column ozone from TOMS total interannual variability QBO component
Vertical structure of ozone QBO at equator 2-cell structure
QBO and stratospheric water vapor
stratospheric water vapor tropical tropopause temperature
QBO variations in stratospheric water vapor from HALOE satellite data, 1991-2003 Deseasonalized anomalies
Vertical propagation of QBO anomalies (interannual ‘tape recorder’)
Stratospheric H2O anomalies are consistent with tropical tropopause temperature changes HALOE H2O anomalies tropical tropopause temperature anomalies
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!
QBO Happy Birthday Jim!