Articles | Volume 20, issue 1
Atmos. Chem. Phys., 20, 243–266, 2020
https://doi.org/10.5194/acp-20-243-2020
Atmos. Chem. Phys., 20, 243–266, 2020
https://doi.org/10.5194/acp-20-243-2020
Research article
06 Jan 2020
Research article | 06 Jan 2020

Very high stratospheric influence observed in the free troposphere over the northern Alps – just a local phenomenon?

Thomas Trickl et al.

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Cited articles

ATMOFAST: Atmosphärischer Ferntransport und seine Auswirkungen auf die Spurengaskonzentrationen in der freien Troposphäre über Mitteleuropa (Atmospheric Long-range Transport and its Impact on the Trace-gas Composition of the Free Troposphere over Central Europe), Project Final Report, edited by: Trickl, T., Kerschgens, M., Stohl, A., and Trickl, T., funded by the German Ministry of Education and Research within the programme “Atmosphärenforschung 2000”, http://www.trickl.de/ATMOFAST.htm (last access: 2 January 2020), 130 pp., 2005 (in German). 
Beekmann, M., Ancellet, G., Blonsky, S., De Muer, D., Ebel, A., Elbern, H., Hendricks, J., Kowol, J., Mancier, C., Sladkovic, R., Smit, H. G. J., Speth, P., Trickl, T., and Van Haver, P.: Regional and Global Tropopause Fold Occurrence and Related Ozone Flux across the Tropopause, J. Atmos. Chem., 28, 29–44, 1997. 
Browell, E. V., Danielsen, E. F., Ismail, S., Gregory, G. L., and Beck, S. M.: Tropopause Fold Structure Determined from Airborne Lidar and in Situ Measurements, J. Geophys. Res., 92, 2112–2120, 1987. 
Cammas, J.-P., Jacoby-Koaly, S., Suhre, K., Rosset, R., and Marenco, A.: Atlantic subtropical potential vorticity barrier of Ozone by Airbus In-Service Aircraft (MOZAIC) flights, J. Geophys. Res., 103, 25681–25693, 1998. 
Carnuth, W. and Trickl, T.: Transport studies with the IFU three-wavelength aerosol lidar during the VOTALP Mesolcina experiment, Atmos. Environ., 34, 1425–1434, 2000. 
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Short summary
Ozone transfer from the stratosphere to the troposphere seems to to have grown over the past decade, parallel to global warming. Lidar measurements, carried out in Garmisch-Partenkirchen, Germany, between 2007 and 2016 show a considerable stratospheric influence in the free troposphere over these sites, with observations of stratospheric layers in the troposphere on 84 % of the measurement days. This high fraction is almost reached also in North America, but frequently not throughout the year.
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