Carbonyl sulfide (COS) as a tracer for canopy photosynthesis, transpiration and stomatal conductance: potential and limitations (Articolo in rivista)

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Label
  • Carbonyl sulfide (COS) as a tracer for canopy photosynthesis, transpiration and stomatal conductance: potential and limitations (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Alternative label
  • Wohlfhart G., Brilli F., Hortnagl L., Xu X., Bingemer H., Hansel A., Loreto F. (2012)
    Carbonyl sulfide (COS) as a tracer for canopy photosynthesis, transpiration and stomatal conductance: potential and limitations
    in Plant, cell and environment (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Wohlfhart G., Brilli F., Hortnagl L., Xu X., Bingemer H., Hansel A., Loreto F. (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) Wohlfhart G., Hortnagl L.; 2) Brilli F.; 3) Xu X.; 4) Bingemer H.; 5) Hansel A. 1) Institute of Ecology, University of Innsbruck, Sternwartestr. 15, 6020 Innsbruck,Austria 2) Ionicon Analytik GmbH, Eduard-Bodem-Gasse 3, 6020 Innsbruck,Austria 3) Key Laboratory for Atmospheric Chemistry, Centre for Atmosphere Watch & Services, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Zhongguancun Nandajie 46, Beijing 100081, China 4) Institute for Atmospheric and Environmental Sciences, J.W. Goethe University, Altenhöferallee 1, 60438 Frankfurt am Main, Germany 5) Institute of Ion Physics and Applied Physics, University of Innsbruck, Technikerstr. 25, 6020 Innsbruck,Austria (literal)
Titolo
  • Carbonyl sulfide (COS) as a tracer for canopy photosynthesis, transpiration and stomatal conductance: potential and limitations (literal)
Abstract
  • The theoretical basis for the link between the leaf exchange of carbonyl sulfide (COS), carbon dioxide (CO2) and water vapour (H2O) and the assumptions that need to be made in order to use COS as a tracer for canopy net photosynthesis, transpiration and stomatal conductance, are reviewed. The ratios of COS to CO2 and H2O deposition velocities used to this end are shown to vary with the ratio of the internal to ambient CO2 and H2O mole fractions and the relative limitations by boundary layer, stomatal and internal conductance for COS. It is suggested that these deposition velocity ratios exhibit considerable variability, a finding that challenges current parameterizations, which treat these as vegetation-specific constants. COS is shown to represent a better tracer for CO2 than H2O. Using COS as a tracer for stomatal conductance is hampered by our present poor understanding of the leaf internal conductance to COS. Estimating canopy level CO2 and H2O fluxes requires disentangling leaf COS exchange from other ecosystem sources/sinks of COS. We conclude that future priorities for COS research should be to improve the quantitative understanding of the variability in the ratios of COS to CO2 and H2O deposition velocities and the controlling factors, and to develop operational methods for disentangling ecosystem COS exchange into contributions by leaves and other sources/ sinks. To this end, integrated studies, which concurrently quantify the ecosystem-scale CO2, H2O and COS exchange and the corresponding component fluxes, are urgently needed. (literal)
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