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@ARTICLE{Konopka:824647,
      author       = {Konopka, Paul and Ploeger, Felix and Tao, Mengchu and
                      Riese, Martin},
      title        = {{Z}onally resolved impact of {ENSO} on the stratospheric
                      circulation and water vapor entry values},
      journal      = {Journal of geophysical research / Atmospheres},
      volume       = {121},
      number       = {19},
      issn         = {2169-897X},
      address      = {Hoboken, NJ},
      publisher    = {Wiley},
      reportid     = {FZJ-2016-07210},
      pages        = {11,486 - 11,501},
      year         = {2016},
      abstract     = {Based on simulations with the Chemical Lagrangian Model of
                      the Stratosphere (CLaMS) for the period 1979–2013, with
                      model transport driven by the ECMWF ERA-Interim reanalysis,
                      we discuss the impact of the El Niño Southern Oscillation
                      (ENSO) on the variability of the dynamics, water vapor,
                      ozone, and mean age of air (AoA) in the tropical lower
                      stratosphere during boreal winter. Our zonally resolved
                      analysis at the 390 K potential temperature level reveals
                      that not only (deseasonalized) ENSO-related temperature
                      anomalies are confined to the tropical Pacific
                      (180–300°E) but also anomalous wave propagation and
                      breaking, as quantified in terms of the Eliassen-Palm (EP)
                      flux divergence, with strongest local contribution during
                      the La Niña phase. This anomaly is coherent with respective
                      anomalies of water vapor (±0.5 ppmv) and ozone (±100 ppbv)
                      derived from CLaMS being in excellent agreement with the
                      Aura Microwave Limb Sounder observations. Thus, during El
                      Niño a more zonally symmetric wave forcing drives a deep
                      branch of the Brewer-Dobson (BD) circulation. During La
                      Niña this forcing increases at lower levels (≈390 K) over
                      the tropical Pacific, likely influencing the shallow branch
                      of the BD circulation. In agreement with previous studies,
                      wet (dry) and young (old) tape recorder anomalies propagate
                      upward in the subsequent months following El Niño (La
                      Niña). Using CLaMS, these anomalies are found to be around
                      +0.3 (−0.2) ppmv and −4 (+4) months for water vapor and
                      AoA, respectively. The AoA ENSO anomaly is more strongly
                      affected by the residual circulation (≈2/3) than by eddy
                      mixing (≈1/3).},
      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) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-244 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000386976100019},
      doi          = {10.1002/2015JD024698},
      url          = {https://juser.fz-juelich.de/record/824647},
}