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@ARTICLE{Vogel:256583,
author = {Vogel, Bärbel and Günther, G. and Müller, Rolf and
Grooss, Jens-Uwe and Riese, M.},
title = {{I}mpact of different {A}sian source regions on the
composition of the {A}sian monsoon anticyclone and on the
extratropical lowermost stratosphere},
journal = {Atmospheric chemistry and physics / Discussions},
volume = {15},
number = {7},
issn = {1680-7375},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2015-06457},
pages = {9941 - 9995},
year = {2015},
abstract = {The impact of different boundary layer source regions in
Asia on the chemical composition of the Asian monsoon
anticyclone, considering its intraseasonal variability in
2012, is analysed by CLaMS simulations using artificial
emission tracers. Our simulations show that the Asian
monsoon anticyclone is highly variable in location and shape
and oscillates between 2 states: first a symmetric
anticyclone and second, an asymmetric anticyclone either
elongated or split in two smaller anticyclones. A maximum in
the distribution of air originating from Indian/Chinese
boundary layer sources is usually found in the core of the
symmetric anticyclone, in contrast the asymmetric state is
characterised by a double peak structure in the horizontal
distribution of air originating from India and China. The
simulated horizontal distribution of artificial emission
tracers for India/China is in agreement with patterns found
in satellite measurements of O3 and CO by the Aura Microwave
Limb Sounder (MLS). The contribution of different boundary
source regions to the Asian monsoon anticyclone strongly
depends on its intraseasonal variability and is therefore
more complex than hitherto believed, but in general the
highest contributions are from North India and Southeast
Asia at 380 K. In the early (June to mid-July) and late
(mid-August to October) period of the monsoon 2012,
contributions of emissions from Southeast Asia are highest
and in the intervening period (≈ mid-July to mid-August)
emissions from North India have the largest impact. Further,
our simulations confirm that the thermal tropopause above
the anticyclone constitutes a vertical transport barrier.
Enhanced contributions of emission tracers for Asia are
found at the northern flank of the Asian monsoon anticyclone
between double tropopauses indicating an isentropic
transport from the anticyclone into the lowermost
stratosphere.},
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-15-9941-2015},
url = {https://juser.fz-juelich.de/record/256583},
}