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| Titel |
The impact of the Asian summer monsoon on the composition of the extratropical lower stratosphere |
| VerfasserIn |
Peter Hoor, Stefan Müller, Heiko Bozem, Jens Krause, Andreas Zahn, Harald Boenisch, Andreas Engel, Bärbel Vogel, Christian Rolf, Felix Ploeger, Martina Krämer, Martin Riese, Hans Schlager |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250145845
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| Publikation (Nr.) |
 EGU/EGU2017-9819.pdf |
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| Zusammenfassung |
| We present tracer measurements from the German research aircraft HALO, which were obtained during the TACTS/ESMVal-project (Transport and Composition in the UT/LS and Earth System Model Validation) in September 2012 in the northern mid latitude lower stratosphere.
We will focus on the distribution of CO, N2O and ozone in the extratropics between potential temperatures of 360 K and 410 K and their changes over the course of the campaign. Based on the distribution of N2O and CO, which constitute two tropospheric tracers of different lifetime one can quantify time scales of transport and chemical ageing of air masses. To account for mixing we analyze the distribution of CO relative to N2O. In geometrical coordinates we observed an increase of N2O and CO over a course of four weeks due to the increased impact of the monsoon system. When analyzing CO relative N2O to account for mixing we observe a decrease of the tropospheric fraction relative to N2O. These results are consistent with the fact that air in Asian monsoon anticyclone is trapped which allows for photochemical CO degradation. Based on the correlation of CO and N2O we estimate an upper limit for the degradation of CO relative to N2O of 30 days. |
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