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@ARTICLE{Mller:279616,
author = {Müller, S. and Hoor, P. and Bozem, H. and Gute, E. and
Vogel, Bärbel and Zahn, A. and Bönisch, H. and Keber, T.
and Krämer, Martina and Rolf, Christian and Riese, Martin
and Schlager, H. and Engel, A.},
title = {{I}mpact of the {A}sian monsoon on the extratropical lower
stratosphere: {T}race gas observations during {TACTS} over
{E}urope 2012},
journal = {Atmospheric chemistry and physics / Discussions},
volume = {15},
issn = {1680-7367},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2015-07500},
pages = {34765-34812},
year = {2015},
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 = 380 K 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 ΔΘ > 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 = 380 K is of
major importance for the change of the chemical composition
of the Ex-UTLS from summer to autumn.},
cin = {IEK-7},
ddc = {550},
cid = {I:(DE-Juel1)IEK-7-20101013},
pnm = {244 - Composition and dynamics of the upper troposphere and
middle atmosphere (POF3-244)},
pid = {G:(DE-HGF)POF3-244},
typ = {PUB:(DE-HGF)16},
doi = {10.5194/acpd-15-34765-2015},
url = {https://juser.fz-juelich.de/record/279616},
}