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Mean age of stratospheric air derived from AirCore observations

Engel, Andreas; Bönisch, Harald; Ullrich, Markus; Sitals, Robert; Membrive, Olivier; Danis, Francois; Crevoisier, Cyril

Mean age of stratospheric air can be derived from observations of sufficiently long-lived trace gases with approximately linear trends in the troposphere. Mean age can serve as a tracer to investigate stratospheric transport and long-term changes in the strength of the overturning Brewer-Dobson circulation of the stratosphere. For this purpose, a low-cost method is required in order to allow for regular observations up to altitudes of about 30 km. Despite the desired low costs, high precision and accuracy are required in order to determine mean age. We present balloon-borne AirCore observations from two midlatitude sites: Timmins in Ontario/Canada and Lindenberg in Germany. During the Timmins campaign, five AirCores sampled air in parallel with a large stratospheric balloon and were analysed for CO₂, CH₄ and partly CO. We show that there is good agreement between the different AirCores (better than 0.1 %), especially when vertical gradients are small. The measurements from Lindenberg were performed using small low-cost balloons and yielded very comparable results. We have used the observations to extend our long-term data set of mea ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.5194/acp-17-6825-2017
ISSN: 1680-7316, 1680-7324
URN: urn:nbn:de:swb:90-715262
KITopen ID: 1000071526
Erschienen in Atmospheric chemistry and physics
Band 17
Heft 11
Seiten 6825-6838
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
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