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

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Alekseychik , P , Mammarella , I , Karpov , D , Dengel , S , Terentieva , I , Sabrekov , A , Glagolev , M & Lapshina , E 2017 , ' Net ecosystem exchange and energy fluxes measured with the eddy covariance technique in a western Siberian bog ' , Atmospheric Chemistry and Physics , vol. 17 , no. 15 , pp. 9333-9345 . https://doi.org/10.5194/acp-17-9333-2017

Title: Net ecosystem exchange and energy fluxes measured with the eddy covariance technique in a western Siberian bog
Author: Alekseychik, Pavel; Mammarella, Ivan; Karpov, Dmitry; Dengel, Sigrid; Terentieva, Irina; Sabrekov, Alexander; Glagolev, Mikhail; Lapshina, Elena
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2017-08-04
Language: eng
Number of pages: 13
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/217911
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 pinecovered bogs elsewhere. The surface energy balance closure approached 100 %. Net CO2 uptake was comparatively high, summing up to CO2 gCm(-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.
Subject: CARBON-DIOXIDE EXCHANGE
INTERANNUAL VARIABILITY
WATER-VAPOR
ATMOSPHERE EXCHANGE
HEAT-EXCHANGE
TEMPERATE BOG
BOREAL
PEATLAND
BALANCE
MIRES
114 Physical sciences
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