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@ARTICLE{Hoffmann:154219,
      author       = {Hoffmann, L. and Hoppe, Charlotte and Müller, Rolf and
                      Dutton, G. S. and Gille, J. C. and Griessbach, S. and Jones,
                      A. and Meyer, C. I. and Spang, R. and Volk, C. M. and
                      Walker, K. A.},
      title        = {{S}tratospheric lifetime ratio of {CFC}-11 and {CFC}-12
                      from satellite and model climatologies},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {14},
      number       = {11},
      issn         = {1680-7375},
      reportid     = {FZJ-2014-03598},
      pages        = {16865 - 16906},
      year         = {2014},
      abstract     = {Chlorofluorocarbons (CFCs) play a key role in stratospheric
                      ozone loss and are strong infrared absorbers that contribute
                      to global warming. The stratospheric lifetimes of CFCs are a
                      measure of their global loss rates that are needed to
                      determine global warming and ozone depletion potentials. We
                      applied the tracer-tracer correlation approach to zonal mean
                      climatologies from satellite measurements and model data to
                      assess the lifetimes of CFCl3 (CFC-11) and CF2Cl2 (CFC-12).
                      We present estimates of the CFC-11/CFC-12 lifetime ratio and
                      the absolute lifetime of CFC-12, based on a reference
                      lifetime of 52 yr for CFC-11. We analyzed climatologies from
                      three satellite missions, the Atmospheric Chemistry
                      Experiment-Fourier Transform Spectrometer (ACE-FTS), the
                      HIgh Resolution Dynamics Limb Sounder (HIRDLS), and the
                      Michelson Interferometer for Passive Atmospheric Sounding
                      (MIPAS). We found a CFC-11/CFC-12 lifetime ratio of
                      0.47±0.08 and a CFC-12 lifetime of 111(96–132) yr for
                      ACE-FTS, a ratio of 0.46±0.07 and a lifetime of
                      112(97–133) yr for HIRDLS, and a ratio of 0.46±0.08 and a
                      lifetime of 112(96–135) yr for MIPAS. The error-weighted,
                      combined CFC-11/CFC-12 lifetime ratio is 0.47±0.04 and the
                      CFC-12 lifetime estimate is 112(102–123) yr. These results
                      agree with the recent Stratosphere-troposphere Processes And
                      their Role in Climate (SPARC) reassessment, which recommends
                      lifetimes of 52(43–67) yr and 102(88–122) yr,
                      respectively. Having smaller uncertainties than the results
                      from other recent studies, our estimates can help to better
                      constrain CFC-11 and CFC-12 lifetime recommendations in
                      future scientific studies and assessments. Furthermore, the
                      satellite observations were used to validate first
                      simulation results from a new coupled model system, which
                      integrates a Lagrangian chemistry transport model into a
                      climate model. For the coupled model we found a
                      CFC-11/CFC-12 lifetime ratio of 0.48±0.07 and a CFC-12
                      lifetime of 110(95–129) yr, based on a ten-year perpetual
                      run. Closely reproducing the satellite observations, the new
                      model system will likely become a useful tool to assess the
                      impact of advective transport, mixing, and photochemistry as
                      well as climatological variability on the stratospheric
                      lifetimes of long-lived tracers.},
      cin          = {JSC / IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)JSC-20090406 / I:(DE-Juel1)IEK-7-20101013},
      pnm          = {411 - Computational Science and Mathematical Methods
                      (POF2-411)},
      pid          = {G:(DE-HGF)POF2-411},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acpd-14-16865-2014},
      url          = {https://juser.fz-juelich.de/record/154219},
}