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@ARTICLE{Yan:849791,
      author       = {Yan, Xiaolu and Konopka, Paul and Ploeger, Felix and Tao,
                      Mengchu and Müller, Rolf and Santee, Michelle L. and Bian,
                      Jianchun and Riese, Martin},
      title        = {{E}l {N}iño {S}outhern {O}scillation influence on the
                      {A}sian summer monsoon anticyclone},
      journal      = {Atmospheric chemistry and physics},
      volume       = {18},
      number       = {11},
      issn         = {1680-7324},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2018-03903},
      pages        = {8079 - 8096},
      year         = {2018},
      abstract     = {We analyse the influence of the El Niño Southern
                      Oscillation (ENSO) on the atmospheric circulation and the
                      mean ozone distribution in the tropical and subtropical UTLS
                      region. In particular, we focus on the impact of ENSO on the
                      onset of the Asian summer monsoon (ASM) anticyclone. Using
                      the Multivariate ENSO Index (MEI), we define climatologies
                      (composites) of atmospheric circulation and composition in
                      the months following El Niño and La Niña (boreal) winters
                      and investigate how ENSO-related flow anomalies propagate
                      into spring and summer. To quantify differences in the
                      divergent and non-divergent parts of the flow, the velocity
                      potential (VP) and the stream function (SF) are respectively
                      calculated from the ERA-Interim reanalysis in the vicinity
                      of the tropical tropopause at potential temperature level
                      θ = 380K. While VP quantifies the well-known ENSO
                      anomalies of the Walker circulation, SF can be used to study
                      the impact of ENSO on the formation of the ASM anticyclone,
                      which turns out to be slightly weaker after El Niño winters
                      than after La Niña winters. In addition, stratospheric
                      intrusions around the eastern flank of the anticyclone into
                      the tropical tropopause layer (TTL) are weaker in the months
                      after strong El Niño events due to more zonally symmetric
                      subtropical jets than after La Niña winters. By using
                      satellite (MLS) and in situ (SHADOZ) observations and model
                      simulations (CLaMS) of ozone, we discuss ENSO-induced
                      differences around the tropical tropopause. Ozone composites
                      show more zonally symmetric features with less in-mixed
                      ozone from the stratosphere into the TTL during and after
                      strong El Niño events and even during the formation of the
                      ASM anticyclone. These isentropic anomalies are overlaid
                      with the well-known anomalies of the faster (slower) Hadley
                      and Brewer–Dobson circulations after El Niño (La Niña)
                      winter. The duration and intensity of El Niño-related
                      anomalies may be reinforced through late summer and autumn
                      if the El Niño conditions last until the following winter.},
      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:000434687100002},
      doi          = {10.5194/acp-18-8079-2018},
      url          = {https://juser.fz-juelich.de/record/849791},
}