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Impact of the Asian monsoon on the extratropical lower stratosphere: Trace gas observations during TACTS over Europe 2012

Mueller, Stefan; Hoor, Peter; Bozem, Heiko; Gute, Ellen; Vogel, Baerbel; Zahn, Andreas; Boenisch, Harald; Keber, Timo; Kraemer, Martina; Rolf, Christian; Riese, Martin; Schlager, Hans; Engel, Andreas

Abstract:
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, O$_{3}$ and N$_{2}$O during TACTS flight 2 on 30 August 2012 show the irreversible mixing of aged stratospheric air masses with younger (recently transported from the troposphere) ones within the Ex-UTLS. Backward trajectories calculated with the trajectory module of CLaMS indicate that these tropospherically affected air masses originate from the Asian monsoon anticyclone. These air masses are subsequently transported above potential temperatures Θ =380K from the monsoon circulation region 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 had affected the chemical composition of the Ex-UTLS during boreal summer and autumn 2012. This leads to an intensification of the tropospheric influence on the extratropical lower strato ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.5194/acp-16-10573-2016
ISSN: 1680-7316, 1680-7324
URN: urn:nbn:de:swb:90-606581
KITopen ID: 1000060658
HGF-Programm 12.03.01; LK 01
Erschienen in Atmospheric chemistry and physics
Band 16
Heft 16
Seiten 10573-10589
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
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