UKMO data were obtained from the British Atmospheric Data Center with the assistance of Lesley Gray. Comments of Steve Pawson and two anonymous reviewers were helpful for the reorganization of this paper and a companion paper. This research was supported by the National Aeronautics and Space Administration, Contracts NAS1-96071, NAS1-99130, and NAS5-98078.
Andrews, D. G., J. R. Holton, and C. B. Leovy, 1987: Middle Atmosphere Dynamics. Academic Press, 489 pp.
Baldwin, M. P., and K. K. Tung, 1994: Extratropical QBO signals in angular momentum and wave forcing. Geophys. Res. Lett.,21, 2717–2720.
——, and T. J. Dunkerton, 1999: Propagation of the Arctic Oscillation from the stratosphere to the troposphere. J. Geophys. Res.,104, 30 937–30 946.
——, X. Cheng, and T. J. Dunkerton, 1994: Observed correlations between winter-mean tropospheric and stratospheric circulation anomalies. Geophys. Res. Lett.,21, 1141–1144.
Belmont, A. D., D. G. Dartt, and G. D. Nastrom, 1974: Periodic variations in stratospheric zonal wind from 20–65 km, at 80N to 70S. Quart. J. Roy. Meteor. Soc.,100, 203–211.
——, ——, and ——, 1975: Variations of stratospheric zonal winds, 20–65 km, 1961–1971. J. Appl. Meteor.,14, 585–594.
Bretherton, C. S., C. Smith, and J. M. Wallace, 1992: An intercomparison of methods for finding coupled patterns in climate data. J. Climate,5, 541–560.
Butchart, N., and E. E. Remsberg, 1986: The area of the stratospheric polar vortex as a diagnostic for tracer transport on an isentropic surface. J. Atmos. Sci.,43, 1319–1339.
Cheng, X., and T. J. Dunkerton, 1995: Orthogonal rotation of spatial patterns derived from singular value decomposition analysis. J. Climate,8, 2631–2643.
Coy, L., E. R. Nash, and P. A. Newman, 1997: Meteorology of the polar vortex: Spring 1997. Geophys. Res. Lett.,24, 2693–2696.
Dunkerton, T. J., 1997: The role of gravity waves in the quasi-biennial oscillation. J. Geophys. Res.,102, 26 053–26 076.
——, 2000: Quasi-biennial and subbiennial variations of stratospheric trace constituents derived from HALOE observations. J. Atmos. Sci.,58, 7–25.
——, and D. P. Delisi, 1985a: The subtropical mesospheric jet observed by the Nimbus 7 Limb Infrared Monitor of the Stratosphere. J. Geophys. Res.,90, 10 681–10 692.
——, and ——, 1985b: Climatology of the equatorial lower stratosphere. J. Atmos. Sci.,42, 376–396.
——, and ——, 1986: Evolution of potential vorticity in the winter stratosphere of January–February 1979. J. Geophys. Res.,91, 1199–1208.
——, and M. P. Baldwin, 1991: Quasi-biennial modulation of planetary-wave fluxes in the Northern Hemisphere winter. J. Atmos. Sci.,48, 1043–1061.
——, and D. P. Delisi, 1997: Interaction of the quasi-biennial oscillation and stratopause semiannual oscillation. J. Geophys. Res.,102, 26 107–26 116.
Eder, B. K., S. K. LeDuc, and J. E. Sickles II, 1999: A climatology of total ozone mapping spectrometer data using rotated principal component analysis. J. Geophys. Res.,104, 3691–3709.
Garcia, R. R., T. J. Dunkerton, R. S. Lieberman, and R. A. Vincent, 1997: Climatology of the semiannual oscillation of the tropical middle atmosphere. J. Geophys. Res.,102, 26 019–26 032.
Gray, L. J., and J. M. Russell III, 1999: Interannual variability of trace gases in the subtropical winter stratosphere. J. Atmos. Sci.,56, 977–993.
Hamilton, K., 1984: Mean wind evolution in the tropical lower stratosphere. J. Atmos. Sci.,41, 2113–2125.
Hansen, G., and M. P. Chipperfield, 1999: Ozone depletion at the edge of the Arctic polar vortex 1996/1997. J. Geophys. Res.,104, 1837–1846.
Hitchman, M. H., and C. B. Leovy, 1986: Evolution of the zonal mean state in the equatorial middle atmosphere during October 1978–May 1979. J. Atmos. Sci.,43, 3159–3176.
Holton, J. R., and H.-C. Tan, 1980: The influence of the equatorial quasi-biennial oscillation on the global circulation at 50 mb. J. Atmos. Sci.,37, 2200–2208.
Kim, K.-Y., and Q. Wu, 1999: A comparison study of EOF techniques:Analysis of nonstationary data with periodic statistics. J. Climate,12, 185–199.
Kreher, K., G. E. Bodeker, H. Kanzawa, H. Nakane, and Y. Sasano, 1999: Ozone and temperature profiles measured above Kiruna inside, at the edge of, and outside the Arctic polar vortex in February and March 1997. Geophys. Res. Lett.,26, 715–718.
Kuroda, Y., and K. Kodera, 1999: Role of planetary waves in the stratosphere–troposphere coupled variability in the northern hemisphere winter. Geophys. Res. Lett.,26, 2375–2378.
Labitzke, K., 1981: Stratospheric–mesospheric midwinter disturbances: A summary of observed characteristics. J. Geophys. Res.,86, 9665–9678.
——, 1987: Sunspots, the QBO, and the stratospheric temperature in the north polar region. Geophys. Res. Lett.,14, 535–537.
Livezey, R. E., and T. M. Smith, 1999: Covariability of aspects of North American climate with global sea surface temperatures on interannual to interdecadal timescales. J. Climate,12, 289–302.
Manney, G. L., M. L. Santee, L. Froidevaux, J. W. Waters, and R. W. Zurek, 1996: Polar vortex conditions during the 1995–1996 Arctic winter: Meteorology and MLS ozone. Geophys. Res. Lett.,23, 3203–3206.
——, L. Froidevaux, M. L. Santee, R. W. Zurek, and J. W. Waters, 1997: MLS observations of Arctic ozone loss in 1996–1997. Geophys. Res. Lett.,24, 2697–2700.
——, W. A. Lahoz, R. Swinbank, A. O’Neill, P. M. Connew, and R. W. Zurek, 1999: Simulation of the December 1998 stratospheric major warming. Geophys. Res. Lett.,26, 2733–2736.
McIntyre, M. E., and T. N. Palmer, 1984: The “surf zone” in the stratosphere. J. Atmos. Terr. Phys.,46, 825–849.
Newman, P. A., J. F. Gleason, R. D. McPeters, and R. S. Stolarski, 1997: Anomalously low ozone over the Arctic. Geophys. Res. Lett.,24, 2689–2692.
Nigam, S., 1990: On the structure of variability of the observed tropospheric and stratospheric zonal-mean zonal wind. J. Atmos. Sci.,47, 1799–1813.
Ortland, D. A., 1997: Rossby wave propagation into the tropical stratosphere observed by the High Resolution Doppler Imager. Geophys. Res. Lett.,24, 1999–2002.
O’Sullivan, D. J., and T. J. Dunkerton, 1994: Seasonal development of the extratropical QBO in a numerical model of the middle atmosphere. J. Atmos. Sci.,51, 3706–3721.
——, and ——, 1997: The influence of the quasi-biennial oscillation on global constituent distributions. J. Geophys. Res.,102, 21 731–21 743.
Plumb, R. A., and R. C. Bell, 1982: A model of the quasi-biennial oscillation on an equatorial beta-plane. Quart. J. Roy. Meteor. Soc.,108, 335–352.
Randel, W. J., F. Wu, J. M. Russell III, A. Roche, and J. W. Waters, 1998: Seasonal cycles and QBO variations in stratospheric CH4 and H2O observed in UARS HALOE data. J. Atmos. Sci.,55, 163–185.
——, ——, ——, and J. Waters, 1999a: Space–time patterns of trends in stratospheric constituents derived from UARS measurements. J. Geophys. Res.,104, 3711–3727.
——, ——, R. Swinbank, J. Nash, and A. O’Neill, 1999b: Global QBO circulation derived from UKMO stratospheric analyses. J. Atmos. Sci.,56, 457–474.
Ray, E. A., M. J. Alexander, and J. R. Holton, 1998: An analysis of the structure and forcing of the equatorial semiannual oscillation in zonal wind. J. Geophys. Res.,103, 1759–1774.
Reber, C. A., C. E. Trevathan, R. J. McNeal, and M. R. Luther, 1993:The Upper Atmosphere Research Satellite (UARS) mission. J. Geophys. Res.,98, 10 643–10 647.
Russell, J. M., III, and Coauthors, 1993: The Halogen Occultation Experiment. J. Geophys. Res.,98, 10 777–10 797.
Swinbank, R., and A. O’Neill, 1994: A stratosphere–troposphere data assimilation system. Mon. Wea. Rev.,122, 686–702.
Thompson, D. W. J., and J. M. Wallace, 1998: The Arctic Oscillation signature in the wintertime geopotential height and temperature fields. Geophys. Res. Lett.,25, 1297–1300.
——, and ——, 2000: Annular modes in the extratropical circulation. Part I: Month-to-month variability. J. Climate,13, 1000–1016.
Weickmann, K. M., and R. M. Chervin, 1988: The observed and simulated atmospheric seasonal cycle. Part I: Global wind field modes. J. Climate,1, 265–289.