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@ARTICLE{Rohs:50145,
      author       = {Rohs, S. and Schiller, C. and Riese, M. and Engel, A. and
                      Schmidt, U. and Wetter, T. and Levin, I. and Nakazawa, T.
                      and Aoki, S.},
      title        = {{L}ong-term changes of methane and hydrogen in the
                      stratosphere in the period 1978-2003 and their impact on the
                      abundance of stratospheric water vapor},
      journal      = {Journal of Geophysical Research},
      volume       = {111},
      issn         = {0148-0227},
      address      = {Washington, DC},
      publisher    = {Union},
      reportid     = {PreJuSER-50145},
      pages        = {D14},
      year         = {2006},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The long-term changes of the stratospheric mixing ratio of
                      CH4 over the period of 1978-2003 are derived from
                      balloon-borne data of H-2, CH4 and N2O. The data were
                      obtained by collecting whole air samples and subsequent gas
                      chromatographic analyses. To eliminate the short-term
                      variability attributed to dynamical processes, the N2O
                      mixing ratio is used as a proxy for altitude. A correlation
                      analysis for the individual years is applied and the CH4
                      mixing ratios are interpolated to four different levels of
                      N2O, corresponding to altitudes of approximately 17, 23, 26
                      and 30 km at midlatitudes. For the investigated period of
                      1978 to 2003 we find increases at the four levels of 207 +/-
                      32 ppb, 159 +/- 21 ppb, 140 +/- 34 ppb and 111 +/- 60 ppb,
                      respectively. The CH4 trend has slowed down in recent years
                      and is best fitted by a second-order polynomial. The
                      increase of CH4 can account for only $25-34\%$ of the
                      increase in stratospheric H2O of $1\%/yr$ over the last
                      decades as derived from previous studies. The simultaneously
                      measured time series of stratospheric H-2 mixing ratios
                      shows that the contribution of stratospheric H-2 to the H2O
                      trend in the period 1988-2003 is minor.},
      keywords     = {J (WoSType)},
      cin          = {ICG-I},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB47},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000239490100003},
      doi          = {10.1029/2005JD006877},
      url          = {https://juser.fz-juelich.de/record/50145},
}