Climate and Dynamics
Recent widening of the tropical belt: Evidence from tropopause observations
Article first published online: 25 OCT 2007
Copyright 2007 by the American Geophysical Union.
Journal of Geophysical Research: Atmospheres (1984–2012)
Volume 112, Issue D20, 27 October 2007
How to Cite
2007), Recent widening of the tropical belt: Evidence from tropopause observations, J. Geophys. Res., 112, D20113, doi:10.1029/2007JD008861., and (
- Issue published online: 25 OCT 2007
- Article first published online: 25 OCT 2007
- Manuscript Accepted: 6 AUG 2007
- Manuscript Revised: 27 JUN 2007
- Manuscript Received: 20 APR 2007
- tropical belt;
 Radiosonde measurements and reanalysis data are used to examine long-term changes in tropopause behavior in the subtropics. Tropopause heights in the subtropics exhibit a bimodal distribution, with maxima in occurrence frequency above 15 km (characteristic of the tropical tropopause) and below 13 km (typical of the extratropical tropopause). Both the radiosonde and reanalysis data show that the frequency of occurrence of high tropopause days in the subtropics of both hemispheres has systematically increased during the past few decades, so that tropical characteristics occur more frequently in recent years. This behavior is consistent with a widening of the tropical belt, and the data indicate an expansion of about 5–8° latitude during 1979–2005.