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@ARTICLE{Rolf:850239,
      author       = {Rolf, Christian and Vogel, Bärbel and Hoor, P. and
                      Afchine, Armin and Günther, Gebhard and Krämer, Martina
                      and Müller, Rolf and Müller, S. and Spelten, Nicole and
                      Riese, Martin},
      title        = {{W}ater vapor increase in the lower stratosphere of the
                      {N}orthern {H}emisphere due to the {A}sian monsoon
                      anticyclone observed during the {TACTS}/{ESMV}al campaigns},
      journal      = {Atmospheric chemistry and physics},
      volume       = {18},
      number       = {4},
      issn         = {1680-7316},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2018-04294},
      pages        = {2973-2983},
      year         = {2018},
      abstract     = {The impact of air masses originating in Asia and influenced
                      by the Asian monsoon anticyclone on the Northern Hemisphere
                      stratosphere is investigated based on in situ measurements.
                      A statistically significant increase in water vapor (H2O) of
                      about 0.5ppmv $(11\%)$ and methane (CH4) of up to 20ppbv
                      $(1.2\%)$ in the extratropical stratosphere above a
                      potential temperature of 380K was detected between August
                      and September 2012 during the HALO aircraft missions
                      Transport and Composition in the UT/LMS (TACTS) and Earth
                      System Model Validation (ESMVal). We investigate the origin
                      of the increased water vapor and methane using the
                      three-dimensional Chemical Lagrangian Model of the
                      Stratosphere (CLaMS). We assign the source of the moist air
                      masses in the Asian region (northern and southern India,
                      eastern China, southeast Asia, and the tropical Pacific)
                      based on tracers of air mass origin used in CLaMS. The water
                      vapor increase is correlated with an increase of the
                      simulated Asian monsoon air mass contribution from about
                      $10\%$ in August to about $20\%$ in September, which
                      corresponds to a doubling of the influence from the Asian
                      monsoon region. Additionally, back trajectories starting at
                      the aircraft flight paths are used to differentiate
                      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 set point of water vapor mixing ratio
                      along these trajectories occurs, can be predominantly
                      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) / STRATOCLIM - Stratospheric
                      and upper tropospheric processes for better climate
                      predictions (603557)},
      pid          = {G:(DE-HGF)POF3-244 / G:(EU-Grant)603557},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000426556500004},
      doi          = {10.5194/acp-18-2973-2018},
      url          = {https://juser.fz-juelich.de/record/850239},
}