# Observed temporal evolution of global mean age of stratospheric air for the 2002 to 2010 period

Stiller, G.P.; Clarmann, T. von; Haenel, F.; Funke, B.; Glatthor, N.; Grabowski, U.; Kellmann, S.; Kiefer, M.; Linden, A.; Lossow, S.; López-Puertas, M.

Abstract:
An extensive observational data set, consisting of more than 106 SF6 vertical profiles distributed globally from MIPAS measurements has been condensed into monthly zonal means of mean age of air for the period September 2002 to January 2010, binned at 10$^\circ$ latitude and 1–2 km altitude. The data were analysed with respect to their temporal variation by fitting a regression model consisting of a constant and a linear increase term, 2 proxies for the QBO variation, sinusoidal terms for the seasonal and semiannual variation and overtones for the correction of the shapes to the observed data set. The impact of subsidence of mesospheric SF6-depleted air and in-mixing into non-polar latitudes on mid-latitudinal absolute age of air and its linear increase was assessed and found to be small. The linear increase of mean age of stratospheric air was found to be positive and partly larger than the trend derived by Engel et al. (2009) for most of the Northern mid-latitudes, the middle stratosphere in the tropics, and parts of the Southern mid latitudes, as well as for the Southern polar upper stratosphere. Multi-year decrease of age of air ... mehr

 Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF) Publikationstyp Zeitschriftenaufsatz Jahr 2012 Sprache Englisch Identifikator ISSN: 1680-7367, 1680-7375 URN: urn:nbn:de:swb:90-400923 KITopen ID: 1000040092 HGF-Programm 12.04.01; LK 01 Erschienen in Atmospheric chemistry and physics / Discussions Band 11 Heft 10 Seiten 28013-28059 Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
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