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Holl, David; Wille, Christian; Sachs, Torsten; Schreiber, Peter; Runkle, Benjamin R K; Beckebanze, Lutz; Langer, Moritz; Boike, Julia; Pfeiffer, Eva-Maria; Fedorova, Irina; Bolshiyanov, Dimitry Yu; Grigoriev, Mikhail N; Kutzbach, Lars (2018): A long-term (2002 to 2017) record of closed path and open path eddy covariance CO₂ net ecosystem exchange fluxes from the Siberian Arctic. PANGAEA, https://doi.org/10.1594/PANGAEA.892751, Supplement to: Holl, D et al. (2019): A long-term (2002 to 2017) record of closed-path and open-path eddy covariance CO2 net ecosystem exchange fluxes from the Siberian Arctic. Earth System Science Data, 11(1), 221-240, https://doi.org/10.5194/essd-11-221-2019

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Abstract:
Ground-based observations of atmospheric variables are necessary to progressively improve global climate models. Observed data can be used for model evaluation and to develop or tune process models. In arctic permafrost regions, climate-carbon feedbacks might potentially be intense. Therefore, increased efforts to better represent these regions in global climate models have been made in recent years.
We present a multiannual time series of soil-atmosphere carbon dioxide fluxes measured in situ with the eddy covariance technique in the Siberian Arctic (72° 22' N, 126° 30' E). The site is part of the international network of carbon dioxide flux observation stations (FLUXNET, Site ID: Ru-Sam). The data set includes consistently processed fluxes based on concentration measurements of closed path and open path gas analyzers. With parallel records from both sensor types, we were able to apply a site-specific correction to open path fluxes. This correction is necessary due to a deterioration of data, caused by heat generated by the electronics of open path gas analyzers. Parameterizing this correction for subperiods of distinct sensor setups yielded good agreement between open and closed path fluxes. We compiled a long-term (2002 to 2017) carbon dioxide flux time series that we additionally gap-filled with a standardized approach.
Further details:
Finkelstein, Peter L; Sims, Pamela F (2001): Sampling error in eddy correlation flux measurements. Journal of Geophysical Research-Atmospheres, 106(D4), 3503-3509, https://doi.org/10.1029/2000JD900731
Kittler, Fanny; Eugster, Werner; Foken, Thomas; Heimann, Martin; Kolle, Olaf; Göckede, Mathias (2017): High-quality eddy-covariance CO₂ budgets under cold climate conditions. Journal of Geophysical Research-Biogeosciences, 122(8), 2064-2084, https://doi.org/10.1002/2017JG003830
Mauder, Matthias; Foken, Thomas (2004): Documentation and instruction manual of the eddy covariance software package TK2. Universität Bayreuth, Abt. Mikrometeorologie, 26, 1-45
Reichstein, Markus; Falge, Eva; Baldocchi, Dennis; Papale, Dario; Aubinet, Marc; Berbigier, Paul; Bernhofer, Christian; Buchmann, Nina; Gilmanov, Tagir; Granier, André; Grünwald, Thomas; Havránková, Katka; Ilvesniemi, Hannu; Janous, Dalibor; Knohl, Alexander; Laurila, Tuomas; Lohila, Annalea; Loustau, Denis; Matteucci, Giorgio; Meyers, Tilden; Miglietta, Franco; Ourcival, Jean‐Marc; Pumpanen, Jukka; Rambal, Serge; Rotenberg, Eyal; Sanz, M-J; Tenhunen, John; Seufert, Günther; Vaccari, Francesco; Vesala, Timo; Yakir, Dan; Valentini, R (2005): On the separation of net ecosystem exchange into assimilation and ecosystem respiration: review and improved algorithm. Global Change Biology, 11(9), 1424-1439, https://doi.org/10.1111/j.1365-2486.2005.001002.x
Coverage:
Latitude: 72.366670 * Longitude: 126.500000
Event(s):
Ru-Sam * Latitude: 72.366670 * Longitude: 126.500000 * Location: Siberian Arctic * Comment: FLUXNET
Comment:
The uploaded file contains quality screened half-hourly time series of carbon dioxide fluxes measured with open and closed path gas analyzers. Based on those measurements, we compiled and gap filled a net ecosystem exchange time series that includes quality flags and eddy covariance source area estimates. Please refer to the Parameter comment for a description of the available variables and to the publications mentioned under "Further details" for details about data processing.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DATE/TIMEDate/TimeKutzbach, LarsGeocode – Timestamp referring to end of 30 minute flux calculation period in local time (UTC+9h)
2DATE/TIMEDate/TimeKutzbach, LarsGeocode – Timestamp referring to end of 30 minute flux calculation period in UTC
3Carbon dioxide flux, closed pathCO2 flux CPµmol/m2/s1Kutzbach, Lars
4Carbon dioxide flux, closed path, quality classesQC CO2 flux CPKutzbach, LarsQuality classes 0,1 and 2 (Mauder and Foken, 2004)
5Carbon dioxide flux, closed pathCO2 flux CPµmol/m2/s1Kutzbach, LarsRandom uncertainty estimate (Finkelstein and Sims, 2001)
6Carbon dioxide flux, open pathCO2 flux OPµmol/m2/s1Kutzbach, Lars
7Carbon dioxide flux, open pathCO2 flux OPµmol/m2/s1Kutzbach, LarsCorrected (Kittler et al., 2017)
8Carbon dioxide flux, open path, quality classesQC CO2 flux OPKutzbach, LarsQuality classes 0,1 and 2 (Mauder and Foken, 2004)
9Carbon dioxide flux, open pathCO2 flux OPµmol/m2/s1Kutzbach, LarsRandom uncertainty estimate (Finkelstein and Sims, 2001)
10Carbon dioxide fluxCO2 fluxµmol/m2/sKutzbach, LarsTime series compiled of open and closed path Mauder and Foken (2004) class 0 and 1 fluxes
11Carbon dioxide fluxCO2 fluxµmol/m2/sKutzbach, LarsGap filled CO2 flux time series
12Carbon dioxide flux, quality classesQC CO2 fluxKutzbach, LarsQuality flag of gap filled fluxes, between 0 and 3 (Reichstein et al., 2005)
13Carbon dioxide flux, standard deviationCO2 flux std dev±Kutzbach, Larsof gap filled flux estimates, calculated from the data used for averaging
14Eddy covariance footprint, contribution of surface classFP CCKutzbach, Larsdry tundra
15Eddy covariance footprint, contribution of surface classFP CCKutzbach, Larswet tundra
16Eddy covariance footprint, contribution of surface classFP CCKutzbach, Larsovergrown water
17Eddy covariance footprint, contribution of surface classFP CCKutzbach, Larsopen water
Size:
1515250 data points

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