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Original Research Papers

Modelling of biospheric CO2 gross fluxes via oxygen isotopes in a spruce forest canopy: a 222Rn calibrated box model approach

Authors:

Uwe Langendörfer,

Institut für Umweltphysik, Universität Heidelberg (UHEI-IUP), Im Neuenheimer Feld 229, 69120 Heidelberg, DE
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Matthias Cuntz,

Institut für Umweltphysik, Universität Heidelberg (UHEI-IUP), Im Neuenheimer Feld 229, 69120 Heidelberg, DE; Laboratoire des Sciences du Climat et de l’Environnement (LSCE), Commisariat à l’Energie Atomique, L’Orme des Merisiers, Bât 709, 91191 Gif sur Yvette, FR
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Philippe Ciais,

Laboratoire des Sciences du Climat et de l’Environnement (LSCE), Commisariat à l’Energie Atomique, L’Orme des Merisiers, Bât 709, 91191 Gif sur Yvette, FR
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Philippe Peylin,

Laboratoire des Sciences du Climat et de l’Environnement (LSCE), Commisariat à l’Energie Atomique, L’Orme des Merisiers, Bât 709, 91191 Gif sur Yvette; Laboratoire de Biogéochimie Isotopique (INRA), Université Pierre et Marie Curie, 75005 Paris, FR
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Thierry Bariac,

Laboratoire de Biogéochimie Isotopique (INRA), Université Pierre et Marie Curie, 75005 Paris, FR
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Irena Milyukova,

Servertzov Institute of Evolutionary and Ecological Problems (IPEE), Suckachev Laboratory for Biogeocenology, Russian Academy of Sciences, Leninskii pr. 33, 117071 Moscow, RU
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Olaf Kolle,

Max-Planck-Institut für Biogeochemie (MPI-BGC), Postfach 100 164, 07701 Jena, DE
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Tobias Naegler,

Institut für Umweltphysik, Universität Heidelberg (UHEI-IUP), Im Neuenheimer Feld 229, 69120 Heidelberg, DE
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Ingeborg Levin

Institut für Umweltphysik, Universität Heidelberg (UHEI-IUP), Im Neuenheimer Feld 229, 69120 Heidelberg, DE
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Abstract

One-dimensional box model estimates of biospheric CO2 gross fluxes are presented. The simulations are based on a set of measurements performed during the EUROSIBERIAN CARBONFLUX intensive campaign between 27 July and 1 August 1999 in a natural Picea abies forest in Russia. CO2 mixing ratios and stable isotope ratios of CO2 were measured on flask samples taken in two heights within the canopy. Simultaneously, soil and leaf samples were collected and analysed to derive the 18O/16O ratio of the respective water reservoirs and the 13C/12C ratio of the leaf tissue. The main objective of this project was to investigate biospheric gas exchange with soil and vegetation, and thereby take advantage of the potential of the 18O/16O ratio in atmospheric CO2. Via exchange of oxygen isotopes with associated liquid water reservoirs, leaf CO2 assimilation fluxes generally enrich while soil CO2 respiration fluxes generally deplete the 18O/16O ratio of atmospheric CO2. In the model, we parameterised intra-canopy transport by exploiting soil-borne 222Rn as a tracer for turbulent transport. Our model approach showed that, using oxygen isotopes, the net ecosystem CO2 flux can be separated into assimilation and respiration yielding fluxes comparable with those derived by other methods. However, partitioning is highly sensitive to the respective discrimination factors, and therefore also on the parameterisation of internal leaf CO2 concentrations and gradients.

How to Cite: Langendörfer, U., Cuntz, M., Ciais, P., Peylin, P., Bariac, T., Milyukova, I., Kolle, O., Naegler, T. and Levin, I., 2002. Modelling of biospheric CO2 gross fluxes via oxygen isotopes in a spruce forest canopy: a 222Rn calibrated box model approach. Tellus B: Chemical and Physical Meteorology, 54(5), pp.476–496. DOI: http://doi.org/10.3402/tellusb.v54i5.16682
  Published on 01 Jan 2002
 Accepted on 18 Jun 2002            Submitted on 9 Jul 2001

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