TY  - JOUR
A1  - Müller, Stefan
A1  - Hoor, Peter
A1  - Gute, Ellen
A1  - Vogel, Bärbel
A1  - Zahn, Andreas
A1  - Bönisch, Harald
A1  - Keber, Timo
A1  - Krämer, Martina
A1  - Rolf, Christian
A1  - Riese, Martin
A1  - Schlager, Hans
A1  - Engel, Andreas
T1  - Impact of the Asian monsoon on the extratropical lower stratosphere: trace gas observations during TACTS over Europe 2012
T2  - Atmospheric chemistry and physics. Discussions
N2  - The transport of air masses originating from the Asian monsoon anticyclone into the extratropical upper troposphere and lower stratosphere (Ex-UTLS) above potential temperatures Θ = 380K was identified during the HALO aircraft mission TACTS in August and September 2012. In-situ measurements of CO, O3 and N2O during TACTS Flight 2 on the 30 August 2012 show the irreversible mixing of aged with younger (originating from the troposphere) stratospheric air masses within the Ex-UTLS. Backward trajectories calculated with the trajetory module of the CLaMS model indicate that these tropospherically affected air masses originate from the Asian monsoon anticyclone. From the monsoon circulation region these air masses are quasi-isentropically transported above Θ = 380 K into the Ex-UTLS where they subsequently mix with stratospheric air masses. The overall trace gas distribution measured during TACTS shows that this transport pathway has a significant impact on the Ex-UTLS during boreal summer and autumn. This leads to an intensification of the tropospheric influence on the Ex-UTLS with ∆Θ > 30 K (relative to the tropopause) within three weeks during the TACTS mission. In the same time period a weakening of the tropospheric influence on the lowermost stratosphere (LMS) is determined. Therefore, the study shows that the transport of air masses originating from the Asian summer monsoon region within the lower stratosphere above Θ = 380K is of major importance for the change of the chemical composition of the Ex-UTLS from summer to autumn.
Y1  - 2015
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/42008
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-420083
UR  - http://www.atmos-chem-phys-discuss.net/15/34765/2015
SN  - 1680-7375
SN  - 1680-7367
N1  - © Author(s) 2015. CC Attribution 3.0 License.
VL  - 15
SP  - 34765
EP  - 34812
PB  - European Geosciences Union
CY  - Katlenburg-Lindau
ER  -