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Variability of age of air derived from MIPAS SF₆ measurements

Haenel, Florian Johannes

Abstract (englisch):

A new and improved setup of the SF6 retrieval together with a newly calibrated version of MIPAS-ENVISAT level 1b spectra (version 5, ESA data version 5.02/5.06) was used to obtain a new global data set of vertically resolved SF6 mixing ratios, covering the total observational period of MIPAS from July 2002 to April 2012 for the first
time. This data set was validated with balloon-borne in-situ measurements as well as with data from the other renowned satellite instrument measuring SF6, the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS). Monthly and zonally averaged SF6 vertical profiles were converted into mean age of air (AoA) using a tropospheric SF6 reference curve. The obtained data set of age of air was compared to airborne age of air measurements. The temporal evolution of the mean age of air was then investigated in 10° latitude and 1-2 km altitude bins. A regression model consisting of a constant and a linear trend term, two proxies for the quasi-biennial oscillation variation, sinusoidal terms for the seasonal and semiannual variation and overtones was fitted to the age of air time series. The annual cycle of age of air for particular regions in the stratosphere was investigated and compared to other studies.
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Volltext §
DOI: 10.5445/IR/1000074409
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Hochschulschrift
Publikationsjahr 2017
Sprache Englisch
Identifikator urn:nbn:de:swb:90-744090
KITopen-ID: 1000074409
HGF-Programm 12 (POF III, LK 01) ATMO
Verlag Karlsruher Institut für Technologie (KIT)
Umfang VI, 149 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Physik (PHYSIK)
Institut Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Prüfungsdatum 27.01.2017
Schlagwörter age of air, stratospheric trends, remote sensing, MIPAS, SF6 retrieval, Brewer-Dobson circulation
Referent/Betreuer Orphal, J.
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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