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    Original Research Papers

    A 3-dimensional study of δ18O in atmospheric CO2: contribution of different land ecosystems

    Authors:

    Philippe Peylin ,

    LSCE, Laboratoire des Sciences du Climat et de l'Environnement, FR
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    Philippe Ciais,

    LSCE, Laboratoire des Sciences du Climat et de l'Environnement, FR
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    A. Scott Denning,

    Department of Atmospheric Science, Colorado State University, US
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    Pieter P. Tans,

    Climate Monitoring and Diagnostic Laboratory, US
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    Joseph A. Berry,

    Carnegie Institute of Washington, Department of Plant Biology, US
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    James W. C. White

    Institute of Arctic and Alpine Research and Department of Geological Sciences, University of Colorado, US
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    Abstract

    Land biospheric carbon exchange associated with respiration and photosynthesis exerts a major control on the oxygen isotope composition (δ18O) of atmospheric CO2 especially with respect to the seasonal cycle. In particular, an important feature that requires our attention is the phase of the seasonal cycle of δ18O which lags CO2 by one month in the Arctic. We have developed a global parameterization of the land biotic exchange of 180 in CO2, which has been prescribed in an atmospheric 3-D transport model in order to simulate the global atmospheric distribution of δ18O. Furthermore, we have separated in the model the specific contribution of different regions of the globe to the seasonal and latitudinal variation of δ18O. The model simulated values are compared in detail with atmospheric observations made at 22 different remote stations. The respective role of respiration vs. photosynthesis in determining the phase and amplitude of the δ18O seasonal cycle is also analysed. Based on a good agreement between our model simulation and the atmospheric observations, we observe that the large seasonal cycle of δ18O at high latitudes is mainly due to the respiratory fluxes of all extra-tropical ecosystems while for CO2 the relative contributions of photosynthesis and respiration to the overall seasonal cycle are similar. Geographically, the CO2 exchanges with the northern Siberian ecosystem dominate the δ18O seasonality at all remote stations of the northern hemisphere, reflecting the strongly continental climate of that region.

    How to Cite: Peylin, P., Ciais, P., Denning, A.S., Tans, P.P., Berry, J.A. and White, J.W.C., 1999. A 3-dimensional study of δ18O in atmospheric CO2: contribution of different land ecosystems. Tellus B: Chemical and Physical Meteorology, 51(3), pp.642–667. DOI: http://doi.org/10.3402/tellusb.v51i3.16452
      Published on 01 Jan 1999
    Peer Reviewed
     CC BY 4.0
     Accepted on 30 Sep 1998            Submitted on 23 Jan 1998

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