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@ARTICLE{Vogel:279613,
      author       = {Vogel, B. 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 of the
                      extratropical lowermost stratosphere},
      journal      = {Atmospheric chemistry and physics},
      volume       = {15},
      number       = {23},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2015-07497},
      pages        = {13699 - 13716},
      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 simulations of the Chemical Lagrangian
                      Model of the Stratosphere (CLaMS) using artificial emission
                      tracers. The horizontal distribution of simulated CO, O3,
                      and artificial emission tracers for India/China are in good
                      agreement with patterns found in satellite measurements of
                      O3 and CO by the Aura Microwave Limb Sounder (MLS). Using in
                      addition, correlations of artificial emission tracers with
                      potential vorticity demonstrates that the emission tracer
                      for India/China is a very good proxy for spatial
                      distribution of trace gases within the Asian monsoon
                      anticyclone. The Asian monsoon anticyclone constitutes a
                      horizontal transport barrier for emission tracers and is
                      highly variable in location and shape. From the end of June
                      to early August, a northward movement of the anticyclone
                      and, during September, a strong broadening of the spatial
                      distribution of the emission tracer for India/China towards
                      the tropics are found. In addition to the change of the
                      location of the anticyclone, the contribution of different
                      boundary source regions to the composition of the Asian
                      monsoon anticyclone in the upper troposphere strongly
                      depends on its intraseasonal variability and is therefore
                      more complex than hitherto believed. The largest
                      contributions to the composition of the air mass in the
                      anticyclone are found from northern India and Southeast Asia
                      at a potential temperature of 380 K. In the early (mid-June
                      to mid-July) and late (September) period of the 2012 monsoon
                      season, contributions of emissions from Southeast Asia are
                      highest; in the intervening period (early August), emissions
                      from northern India have the largest impact. Our findings
                      show that the temporal variation of the contribution of
                      different convective regions is imprinted in the chemical
                      composition of the Asian monsoon anticyclone.Air masses
                      originating in Southeast Asia are found both within and
                      outside of the Asian monsoon anticyclone because these air
                      masses experience, in addition to transport within the
                      anticyclone, upward transport at the southeastern flank of
                      the anticyclone and in the tropics. Subsequently, isentropic
                      poleward transport of these air masses occurs at around 380
                      K with the result that the extratropical lowermost
                      stratosphere in the Northern Hemisphere is flooded by the
                      end of September with air masses originating in Southeast
                      Asia. Even after the breakup of the anticyclonic circulation
                      (around the end of September), significant contributions of
                      air masses originating in India/China are still found in the
                      upper troposphere over Asia. Our results demonstrate that
                      emissions from India, China, and Southeast Asia have a
                      significant impact on the chemical composition of the
                      lowermost stratosphere of the Northern Hemisphere, in
                      particular at the end of the monsoon season in
                      September/October 2012.},
      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},
      UT           = {WOS:000367189600026},
      doi          = {10.5194/acp-15-13699-2015},
      url          = {https://juser.fz-juelich.de/record/279613},
}