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| Titel |
Contributions of different boundary layer sources in Asia to the Asian monsoon anticyclone and associated transport pathways to the lowermost stratosphere over northern Europe in 2012 |
| VerfasserIn |
Bärbel Vogel, Gebhard Günther, Rolf Müller, Jens-Uwe Grooß, Heiko Bozem, Peter Hoor, Martina Krämer, Stefan Müller, Andreas Zahn, Martin Riese |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250110765
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| Publikation (Nr.) |
 EGU/EGU2015-10800.pdf |
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| Zusammenfassung |
| The impact of different boundary layer sources in Asia to the
chemical composition of the air in the Asian monsoon anticyclone in
2012 is analysed by CLaMS model simulations using artificial emission
tracers. Our simulations show that the Asian monsoon anticyclone is
highly variable in location and shape. The model behaviour is in
agreement with satellite measurements of O3 and CO (MLS). The
contribution of different boundary sources regions to the Asian
monsoon anticyclone is more complex than hitherto believed, but in
general the highest contribution are from North India and Southeast
Asia at 380 K. In the early (~ June/July) and late period (Sep/Oct)
of the monsoon 2012, contributions of emissions from Southeast Asia
are highest and in the intervening period (~ August) emissions from
North India have the largest impact. Further, long-range transport of
air masses from the Asian monsoon anticyclone to the extratropical
lowermost stratosphere occurs by eastward migrating smaller
anticyclones and filaments separated at the northeastern flank of the
anticyclone transporting within approximately 8-14 days water vapour
and pollutants into the lowermost stratosphere over northern
Europe. Remnants of this long-range transport processes were measured
during the TACTS/ESMVal campaign and could be reproduced by our
simulations. In addition, emissions from Southeast Asia can be
uplifted at the edge of the anticyclone by deep convection and
afterwards are entrained into the circulation around the Asian monsoon
anticyclone. Moreover, they also experienced diabatic upward
transport in the tropics and subsequently isentropic transport
polewards occurs at around 380 K with the result that the
extratropical lowermost stratosphere is flooded end of September with
air masses originating in Southeast Asia. Our simulations demonstrate
that emissions from Asia and Southeast Asia have a significant impact
on the chemical compositions of the lowermost stratosphere of the
northern hemisphere in particular after the end of the monsoon season
in September / October 2012. |
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