A GCM study of the influence of equatorial winds on the timing of sudden stratospheric warmings
Article first published online: 29 MAR 2006
Copyright 2006 by the American Geophysical Union.
Geophysical Research Letters
Volume 33, Issue 6, March 2006
How to Cite
2006), A GCM study of the influence of equatorial winds on the timing of sudden stratospheric warmings, Geophys. Res. Lett., 33, L06825, doi:10.1029/2005GL024715., , and (
- Issue published online: 29 MAR 2006
- Article first published online: 29 MAR 2006
- Manuscript Accepted: 14 FEB 2006
- Manuscript Revised: 25 JAN 2006
- Manuscript Received: 21 SEP 2005
 A full troposphere-stratosphere-mesosphere global circulation model is used in a set of idealised experiments to investigate the sensitivity of the Northern Hemisphere winter stratospheric flow to improvements in the equatorial zonal winds. The model shows significant sensitivity to variability in the upper equatorial stratosphere, the imposition of SAO and QBO like variability in this region advances the timing of midwinter sudden warmings by about one month. Perturbations to the lower equatorial stratosphere are mainly found to influence early winter polar variability. These results suggest that it is important to pay attention to the capability of models to simulate realistic variability in the upper equatorial stratosphere.