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@ARTICLE{Rolf:842034,
      author       = {Rolf, Christian and Vogel, Bärbel and Hoor, Peter and
                      Afchine, Armin and Günther, Gebhard and Krämer, Martina
                      and Müller, Rolf and Müller, Stefan and Spelten, Nicole
                      and Riese, Martin},
      title        = {{W}ater vapor increase in the northern lower stratosphere
                      by the {A}sian monsoon anticyclone observed during
                      {TACTS}/{ESMV}al campaigns},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {856},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2018-00318},
      pages        = {1 - 16},
      year         = {2017},
      abstract     = {The impact of air masses from Asia influenced by the Asian
                      monsoon anticyclone on the northern hemispheric stratosphere
                      is investigated based on in-situ measurements. An
                      statistical significant increase in water vapor of about
                      0.5 ppmv $(11 \%)$ and methane up to 20 ppbv
                      $(1.2 \%)$ in the extra-tropical stratosphere above a
                      potential temperature of 380 K was detected between August
                      and September 2012 by in-situ instrumentation in the
                      northern hemisphere during the HALO aircraft mission TACTS
                      and ESMVal. We investigate the origin of this water vapor
                      and methane increase with the help of the three-dimensional
                      Lagrangian chemistry transport model CLaMS. We assign the
                      source of the moist air masses in the Asian region (North
                      and South India, East China, South East Asia and tropical
                      Pacific) based on tracers of airmass origin used in CLaMS.
                      The water vapor increase is correlated to an increase of the
                      simulated Asian monsoon air mass contribution from $10 \%$
                      in August to $20 \%$ in September, which corresponds to a
                      doubling of the influence of air masses affected by the
                      Asian monsoon region. Additionally, back trajectories
                      starting at the aircraft flight paths are used to
                      differentiate between transport from the Asian monsoon
                      anticyclone and other source regions by calculating the
                      Lagrangian cold point (LCP). The geographic location of the
                      LCPs, which indicates the region where the imprint of water
                      vapor concentration along these trajectories occur, can be
                      exclusively attributed to the Asian monsoon region.},
      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/acp-2017-856},
      url          = {https://juser.fz-juelich.de/record/842034},
}