The authors are grateful to Bill Randel, Paul Kushner, and Isaac Held for useful discussions and thank Mark Baldwin for the NAM indices, and Paul Newman and Eric Nash for access to the NCEP–NCAR reanalyses. This work is funded, in part, by grants from the National Science Foundation and the National Aeronautics and Space Administration.
Baldwin, M. P., and T. J. Dunkerton, 1999: Propagation of the Arctic Oscillation from the stratosphere to the troposphere. J. Geophys. Res, 104 , 30937–30946.
Baldwin, M. P., X. Cheng, and T. Dunkerton, 1989: The stratospheric major warming of early December 1987. J. Atmos. Sci, 46 , 2863–2884.
Christiansen, B., 2001: Downward propagation of zonal mean wind anomalies from the stratosphere to the troposphere: Model and reanalysis. J. Geophys. Res, 106 , 27307–27322.
Fusco, A., and M. Salby, 1999: Interannual variations of total ozone and their relationship to variations of planetary wave activity. J. Climate, 12 , 1619–1629.
Hu, Y., and K. K. Tung, 2002: Interannual and decadal variations of planetary wave activity, stratospheric cooling, and the Northern Hemisphere annular mode. J. Climate, 15 , 1659–1673.
Kodera, K., and M. Chiba, 1995: Role of planetary waves in the stratosphere–troposphere coupled variability in the Northern Hemisphere winter. J. Geophys. Res, 100 , 11055–11068.
Naujokat, B., K. Krüger, K. Matthes, J. Hoffmann, M. Kunze, and K. Labitzke, 2002: The early major warming in December 2001—Exceptional? Geophys. Res. Lett.,29, 2023, doi:10.1029/ 2002GL015316.
Newman, P. A., E. R. Nash, and J. Rosenfield, 2001: What controls the temperature of the Arctic stratosphere during the spring? J. Geophys. Res, 106 , 19999–20010.
Palmer, T., 1981: Diagnostic study of a wavenumber-2 stratospheric sudden warming in a transformed Eulerian-mean formalism. J. Atmos. Sci, 38 , 844–855.
Pawson, S., and B. Naujokat, 1999: The cold winters of the middle 1990s in the northern lower stratosphere. J. Geophys. Res, 104 , 14209–14222.
Randel, W. J., F. Wu, and R. Stolarski, 2002: Changes in column ozone correlated with the stratosphere EP flux. J. Meteor. Soc. Japan, 80 , 849–862.
Scott, R. K., and L. M. Polvani, 2004: Stratospheric control of upward wave flux near the tropopause. Geophys. Res. Lett.,31, L02115, doi:10.1029/2003GL017965.
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.
Thompson, D. W. J., M. P. Baldwin, and J. M. Wallace, 2002: Stratospheric connection to Northern Hemisphere wintertime weather: Implications for predictions. J. Climate, 15 , 1421–1428.
Waugh, D., W. Randel, S. Pawson, P. Newman, and E. Nash, 1999: Persistence of the lower stratospheric polar vortices. J. Geophys. Res, 104 , 27191–27201.