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    Original Research Papers

    Comparative ecosystem–atmosphere exchange of energy and mass in a European Russian and a central Siberian bog I. Interseasonal and interannual variability of energy and latent heat fluxes during the snowfree period

    Authors:

    Juliya Kurbatova ,

    A. N. Severtzov Institute of Ecology and Evolution RAS, Lenisnki Prospect, Moscow, RU
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    Almut Arneth,

    Max Planck Institute for Biogeochemistry, PO Box 100164, 07701 Jena; Max Planck Institute for Meteorology, Bundesstrasse 55, 20146 Hamburg, DE
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    Natasha N. Vygodskaya,

    A. N. Severtzov Institute of Ecology and Evolution RAS, Lenisnki Prospect, Moscow, RU
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    Olaf Kolle,

    Max Planck Institute for Biogeochemistry, PO Box 100164, 07701 Jena, DE
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    Andrej V. Varlargin,

    A. N. Severtzov Institute of Ecology and Evolution RAS, Lenisnki Prospect, Moscow, RU
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    Irena M. Milyukova,

    A. N. Severtzov Institute of Ecology and Evolution RAS, Lenisnki Prospect, Moscow, RU
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    Nadja M. Tchebakova,

    V. N. Sukachev Forest Institute, Akademgorodok, 660036 Krasnoyarsk, RU
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    E.-D. Schulze,

    Max Planck Institute for Biogeochemistry, PO Box 100164, 07701 Jena, DE
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    Jon Lloyd

    Max Planck Institute for Biogeochemistry, PO Box 100164, 07701 Jena, DE
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    Abstract

    Energy and latent heat fluxes λE were measured over ombrotrophic bogs in European Russia (Fyodorovskoye) and in central Siberia (Zotino) using the eddy covariance technique, as part of the EuroSiberian Carbonflux Project. The study covered most of the snowfree periods in 1998, 1999 and 2000; in addition some data were also collected under snow in early spring and late autumn 1999 and 2000. The snowfree period in Europian Russia exceeds the snowfree period in central Siberia by nearly 10 weeks. Marked seasonal and interannual differences in temperatures and precipitation, and hence energy partitioning, were observed at both sites. At both bogs latent heat fluxes (λE) exceeded sensible heat fluxes (H) during most of the snowfree period: maximum λE were between 10 and 12 MJ m−2 d−1 while maximum H were between 3 and 5 MJ m−2 d−1. There was a tendency towards higher Bowen ratios at Fyodorovskoye. Net radiation was the most influential variable that regulated daily evaporation rates, with no obvious effects due to surface dryness during years with exceptionally dry summers. Total snowfree evaporation at Fyodorovskoye (320 mm) exceeded totals at Zotino (280 mm) by 15%. At the former site, evaporation was equal to or less than precipitation, contrasting the Zotino observations, where summer evaporation was distinctly higher than precipitation. During the entire observation period evaporation rates were less than 50% of their potential rate. These data suggest a strong “mulching” effect of a rapidly drying peat surface on total evaporation, despite the substantial area of free water surfaces during parts of the year. This effect of surface dryness was also observed as close atmospheric coupling.

    How to Cite: Kurbatova, J., Arneth, A., Vygodskaya, N.N., Kolle, O., Varlargin, A.V., Milyukova, I.M., Tchebakova, N.M., Schulze, E.-D. and Lloyd, J., 2002. Comparative ecosystem–atmosphere exchange of energy and mass in a European Russian and a central Siberian bog I. Interseasonal and interannual variability of energy and latent heat fluxes during the snowfree period. Tellus B: Chemical and Physical Meteorology, 54(5), pp.497–513. DOI: http://doi.org/10.3402/tellusb.v54i5.16683
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      Published on 01 Jan 2002
    Peer Reviewed
     CC BY 4.0
     Accepted on 28 May 2002            Submitted on 2 Jul 2001

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