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@ARTICLE{Ehhalt:37476,
      author       = {Ehhalt, D. H. and Rohrer, F. and Schauffler, S. and
                      Prather, M.},
      title        = {{O}n the decay of stratospheric pollutants: {D}iagnosing
                      the longest-lived eigenmode},
      journal      = {Journal of Geophysical Research},
      volume       = {109},
      issn         = {0148-0227},
      address      = {Washington, DC},
      publisher    = {Union},
      reportid     = {PreJuSER-37476},
      pages        = {1 - 9},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {[1] On the basis of a one-dimensional (1-D) analysis the
                      decay time of the lowest eigenmode, tau(1), for the
                      stratospheric distribution of a conserved tracer is derived
                      from measured vertical profiles of the mean age of
                      stratospheric air. Two case studies (a and b) give tau(1,a)
                      = 3.8 +/- 0.8 years and tau(1,b) = 5.3 +/- 1.1 years. These
                      semiobservational times are considerably longer than most of
                      the tau(1) derived from 2-D and 3-D models. At the same time
                      they are shorter than the observational eigentime,
                      tau(1,HTO) = 7.7 +/- 2 years, determined from the decay of
                      the tritium (T) content in stratospheric water vapor,
                      following the thermonuclear test explosions in the early
                      1960s. Part of the differences among the observational
                      eigentimes can be explained by the assumptions that had to
                      be made to extract tau(1),(HTO) from the trend in the T
                      content of stratospheric water vapor ( namely, the
                      cosmogenic background of tritiated water vapor and the trend
                      in stratospheric water vapor). This leads to a revised value
                      tau(1,HTO) = 6.3 +/- 0.9 years for the time period
                      1975-1983. Allowing for a possible temporal trend in Gamma
                      and hence tau(1), the value for the current tau(1) decreases
                      to 5.3 +/- 1 years.},
      keywords     = {J (WoSType)},
      cin          = {ICG-II},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB48},
      pnm          = {Chemie und Dynamik der Geo-Biosphäre},
      pid          = {G:(DE-Juel1)FUEK257},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000221077200001},
      doi          = {10.1029/2003JD004029},
      url          = {https://juser.fz-juelich.de/record/37476},
}