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@ARTICLE{Hauglustaine:2512,
      author       = {Hauglustaine, D. A. and Ehhalt, D. H.},
      title        = {{A} three-dimensional model of molecular hydrogen in the
                      troposphere},
      journal      = {Journal of Geophysical Research},
      volume       = {107},
      issn         = {0148-0227},
      address      = {Washington, DC},
      publisher    = {Union},
      reportid     = {PreJuSER-2512},
      pages        = {D17},
      year         = {2002},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The global distribution and budget of atmospheric molecular
                      hydrogen (H-2)is simulated with a global Chemistry-Transport
                      Model (CTM). Surface emissions include technological sources
                      (industry, transportation and other fossil fuel combustion
                      processes), biomass burning, nitrogen fixation in soils, and
                      oceanic activity and totals 39 Tg/yr. The photochemical
                      production (31 Tg/yr) from formaldehyde photolysis accounts
                      for about $45\%$ of the total source of H-2. Soil uptake (55
                      Tg/yr) represents a major loss process for H-2 and
                      contributes for $80\%$ to the total destruction. H-2
                      oxidation by OH in the troposphere contributes the
                      remainder. The global burden of H-2 in the atmosphere is 136
                      Tg. Its overall lifetime in the atmosphere is 1.9 years. H-2
                      is rather well-mixed in the free troposphere. However, its
                      distribution shows a significant seasonal variation in the
                      lower troposphere where soil uptake dominates. This loss
                      process shows a strong temporal variability and is maximum
                      over the northern hemisphere landmass during summer. Strong
                      vertical gradients result from this surface uptake. In these
                      regions, H-2 varies by more than $30\%$ between the maximum
                      mixing ratio in winter and the summer minimum. Our results
                      stress the important role played by the tropics in the
                      budget of H-2. In these regions a strong seasonal cycle is
                      also predicted due to the annual variation in biomass
                      burning emissions, soil uptake, and rapid transport by
                      convection of H-2 depleted air masses from the boundary
                      layer to the upper troposphere. A comparison with the
                      observed H-2 distribution allows to test some of the model
                      predictions. Good agreement is found for the global burden
                      and the annually averaged latitudinal gradient in the
                      southern hemisphere and the tropics. A detailed comparison
                      of the seasonal cycles of H-2 in surface air indicates that
                      the use of the net primary productivity to prescribe the
                      seasonal and geographical pattern of soil uptake in the
                      model leads to an underestimate of the deposition velocity
                      during winter and spring over the continents in the northern
                      hemisphere.},
      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:000180427200010},
      doi          = {10.1029/2001JD001156},
      url          = {https://juser.fz-juelich.de/record/2512},
}