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The Scientific World Journal
Volume 2012, Article ID 191028, 5 pages
Research Article

On the Origin of the Air between Multiple Tropopauses at Midlatitudes

1Smith School of Enterprise and the Environment, University of Oxford, Oxford OX1 2BQ, UK
2Ephyslab, Facultad de Ciencias de Ourense, Universidade de Vigo, 32004 Ourense, Spain

Received 17 March 2012; Accepted 27 April 2012

Academic Editors: G.-C. Fang and P. Povinec

Copyright © 2012 Juan Antonio Añel et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Multiple tropopauses are structures that regularly recur in the midlatitudes. Recent studies have relied on the notion of the excursion of tropical air from the upper troposphere into higher latitudes, thereby overlaying the tropopause of the midlatitudes. We herein analyse the origin and characteristics of the air at the Boulder radiosonde station, between the first and second tropopauses combining an analysis of radiosonde data with a Lagrangian approach based on the FlexPart model and ERA-40 analysis data. Our results show that the air between both tropopauses has its origin in midlatitudes.