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Volume 17, issue 15 | Copyright

Special issue: Pan-Eurasian Experiment (PEEX)

Atmos. Chem. Phys., 17, 9333-9345, 2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 04 Aug 2017

Research article | 04 Aug 2017

Net ecosystem exchange and energy fluxes measured with the eddy covariance technique in a western Siberian bog

Pavel Alekseychik1, Ivan Mammarella1, Dmitry Karpov2, Sigrid Dengel6, Irina Terentieva3, Alexander Sabrekov2,3, Mikhail Glagolev2,3,4,5, and Elena Lapshina2 Pavel Alekseychik et al.
  • 1Department of Physics, University of Helsinki, P.O. Box 68, 00014, Helsinki, Finland
  • 2Department of Environmental dynamics and global climate change, Yugra State University, 628012, Khanty-Mansiysk, Russia
  • 3BIO-GEO-CLIM Laboratory, Tomsk State University, Tomsk, 643050, Russia
  • 4Department of Soil Physics and Development, 119991, Moscow State University, Moscow, Russia
  • 5Institute of Forest Science, Russian Academy of Sciences, 143030, Moscow, Russia
  • 6Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA

Abstract. Very few studies of ecosystem–atmosphere exchange involving eddy covariance data have been conducted in Siberia, with none in the western Siberian middle taiga. This work provides the first estimates of carbon dioxide (CO2) and energy budgets in a typical bog of the western Siberian middle taiga based on May–August measurements in 2015. The footprint of measured fluxes consisted of a homogeneous mixture of tree-covered ridges and hollows with the vegetation represented by typical sedges and shrubs. Generally, the surface exchange rates resembled those of pine-covered bogs elsewhere. The surface energy balance closure approached 100%. Net CO2 uptake was comparatively high, summing up to 202gCm−2 for the four measurement months, while the Bowen ratio was seasonally stable at 28%. The ecosystem turned into a net CO2 source during several front passage events in June and July. The periods of heavy rain helped keep the water table at a sustainably high level, preventing a usual drawdown in summer. However, because of the cloudy and rainy weather, the observed fluxes might rather represent the special weather conditions of 2015 than their typical magnitudes.

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West Siberian peatlands occupy a large fraction of land area in the region, and yet little is known about their interaction with the atmosphere. We took the first measurements of CO2 and energy surface balances over a typical bog of West Siberian middle taiga, in the vicinity of the Mukhrino field station (Khanty–Mansiysk). The May–August study in a wet year (2015) revealed a relatively large photosynthetic sink of CO2 that was close to the high end of estimates at bog sites elsewhere.
West Siberian peatlands occupy a large fraction of land area in the region, and yet little is...