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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.

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

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Verlagsausgabe §
DOI: 10.5445/IR/1000040092
Veröffentlicht am 19.07.2018
DOI: 10.5194/acpd-11-28013-2011
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
KITopen-ID: 1000040092
HGF-Programm 12.04.01 (POF II, LK 01)
Erschienen in Atmospheric chemistry and physics / Discussions
Band 11
Heft 10
Seiten 28013-28059
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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