A long-term (2002 to 2017) record of closed-path and open-path eddy covariance CO₂ net ecosystem exchange fluxes from the Siberian Arctic

摘要

Abstract. Ground-based observations of land–atmosphere fluxes arenecessary to progressively improve global climate models. Observed data canbe used for model evaluation and to develop or tune process models. In arcticpermafrost regions, climate–carbon feedbacks are amplified. Therefore,increased efforts to better represent these regions in global climate modelshave been made in recent years. We present a multi-annual time series ofland–atmosphere carbon dioxide fluxes measured in situ with theeddy covariance technique in the Siberian Arctic (72~(°)22~(′)N,126~(°)30~(′)E). The site is part of the international network of eddycovariance flux observation stations (FLUXNET; site ID: Ru-Sam). The data setincludes consistently processed fluxes based on concentration measurements ofclosed-path and open-path gas analyzers. With parallel records from bothsensor types, we were able to apply a site-specific correction to open-pathfluxes. This correction is necessary due to a deterioration of data, causedby heat generated by the electronics of open-path gas analyzers.Parameterizing this correction for subperiods of distinct sensor setupsyielded good agreement between open- and closed-path fluxes. We compiled along-term (2002 to 2017) carbon dioxide flux time series that we additionallygap-filled with a standardized approach. The data set was uploaded to thePangaea database and can be accessed through https://doi.org/10.1594/PANGAEA.892751.