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@ARTICLE{Seibt:13369,
      author       = {Seibt, U. and Kesselmeier, J. and Sandoval-Soto, L. and
                      Kuhn, U. and Berry, J.A.},
      title        = {{A} kinetic analysis of leaf uptake of {COS} and its
                      relation to transpiration, photosynthesis and carbon isotope
                      fractionation},
      journal      = {Biogeosciences},
      volume       = {7},
      issn         = {1726-4170},
      address      = {Katlenburg-Lindau [u.a.]},
      publisher    = {Copernicus},
      reportid     = {PreJuSER-13369},
      pages        = {333 - 341},
      year         = {2010},
      note         = {We are grateful to Parv Suntharalingam, Graham Farquhar,
                      and the two referees for discussions, helpful comments and
                      suggestions. The research leading to these results has
                      received funding from the European Research Council under
                      the European Community's Seventh Framework Programme
                      (FP7/2007-2013)/ERC Grant Agreement no. 202835 "COSIRIS".},
      abstract     = {Carbonyl sulfide (COS) is an atmospheric trace gas that
                      holds great promise for studies of terrestrial carbon and
                      water exchange. In leaves, COS follows the same pathway as
                      CO2 during photosynthesis. Both gases are taken up in enzyme
                      reactions, making COS and CO2 uptake closely coupled at the
                      leaf scale. The biological background of leaf COS uptake is
                      a hydrolysis reaction catalyzed by the enzyme carbonic
                      anhydrase. Based on this, we derive and test a simple
                      kinetic model of leaf COS uptake, and relate COS to CO2 and
                      water fluxes at the leaf scale. The equation was found to
                      predict realistic leaf COS fluxes compared to observations
                      from field and laboratory chambers. We confirm that COS
                      uptake at the leaf level is directly linked to stomatal
                      conductance. As a consequence, the ratio of normalized
                      uptake rates (uptake rates divided by ambient mole fraction)
                      for leaf COS and CO2 fluxes can provide an estimate of
                      C-i/C-a, the ratio of intercellular to atmospheric CO2, an
                      important plant gas exchange parameter that cannot be
                      measured directly. The majority of published normalized COS
                      to CO2 uptake ratios for leaf studies on a variety of
                      species fall in the range of 1.5 to 4, corresponding to
                      C-i/C-a ratios of 0.5 to 0.8. In addition, we utilize the
                      coupling of C-i/C-a and photosynthetic C-13 discrimination
                      to derive an estimate of 2.8 +/- 0.3 for the global mean
                      normalized uptake ratio. This corresponds to a global
                      vegetation sink of COS in the order of 900 +/- 100 Gg S
                      yr(-1). COS can now be implemented in the same model
                      framework as CO2 and water vapour. Atmospheric COS
                      measurements can then provide independent constraints on CO2
                      and water cycles at ecosystem, regional and global scales.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima / COSIRIS - Investigating the
                      terrestrial carbon and water cycles with a multi-tracer
                      approach (202835)},
      pid          = {G:(DE-Juel1)FUEK491 / G:(EU-Grant)202835},
      shelfmark    = {Ecology / Geosciences, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000274058100026},
      url          = {https://juser.fz-juelich.de/record/13369},
}