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Seasonal variations of a mixing layer in the lowermost stratosphere as identified by the CO-O3 correlation from in situ measurements

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons101011

Hoor,  P.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons100935

Fischer,  H.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons101097

Lange,  L.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons101104

Lelieveld,  J.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Zitation

Hoor, P., Fischer, H., Lange, L., Lelieveld, J., & Brunner, D. (2002). Seasonal variations of a mixing layer in the lowermost stratosphere as identified by the CO-O3 correlation from in situ measurements. Journal of Geophysical Research, 107(D5-D6): 4044. doi:10.1029/2000JD000289.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0014-9148-D
Zusammenfassung
[1] Within the Stratosphere Troposphere Experiment by Aircraft Measurements (STREAM) project, airborne measurements of various trace species such as CO, CO2, N2O, and O-3 have been performed in several years and seasons. Here we focus on a summer campaign conducted from Timmins (Canada, 47degreesN, 80degreesW) in July 1998 and winter measurements carried out in March 1997 from Kiruna (Sweden, 68degreesN, 20degreesE). From correlations between CO and O-3 we identify a mixing layer in the lowermost stratosphere of which the vertical extent shows a significant seasonal variability. Troposphere to stratosphere exchange appears to be more vigorous in summer, although CO mixing ratios of the order of 15 ppbv indicate the presence of aged stratospheric air. While a significant tropospheric influence was observed up to potential temperatures of Theta = 330 K in March, the mixing layer in July increased to = 360 K. In addition, its elevation above the tropopause also showed an increase. The CO-O-3 correlation indicates that the higher elevation in July is most likely caused by a stronger contribution of subtropical tropospheric air, which was mixed into the lowermost stratosphere at the subtropical jet.