Citation:

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, Riccardo (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

Date/Time Start: 2002-07-11T09:30:00 * Date/Time End: 2017-10-01T00:00:00

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):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Date/Time local	Date/Time local		Kutzbach, Lars	Timestamp referring to end of 30 minute flux calculation period in local time (UTC+9h)
2	DATE/TIME	Date/Time		Kutzbach, Lars	Geocode – Timestamp referring to end of 30 minute flux calculation period in UTC
3	Carbon dioxide, flux, closed path	CO2 flux CP	µmol/m²/s	Kutzbach, Lars
4	Carbon dioxide, flux, closed path, quality classes	QC CO2 flux CP		Kutzbach, Lars	Quality classes 0,1 and 2 (Mauder and Foken, 2004)
5	Carbon dioxide, flux, closed path	CO2 flux CP	µmol/m²/s	Kutzbach, Lars	Random uncertainty estimate (Finkelstein and Sims, 2001)
6	Carbon dioxide, flux, open path	CO2 flux OP	µmol/m²/s	Kutzbach, Lars
7	Carbon dioxide, flux, open path	CO2 flux OP	µmol/m²/s	Kutzbach, Lars	Corrected (Kittler et al., 2017)
8	Carbon dioxide, flux, open path, quality classes	QC CO2 flux OP		Kutzbach, Lars	Quality classes 0,1 and 2 (Mauder and Foken, 2004)
9	Carbon dioxide, flux, open path	CO2 flux OP	µmol/m²/s	Kutzbach, Lars	Random uncertainty estimate (Finkelstein and Sims, 2001)
10	Carbon dioxide, flux	CO2 flux	µmol/m²/s	Kutzbach, Lars	Time series compiled of open and closed path Mauder and Foken (2004) class 0 and 1 fluxes
11	Carbon dioxide, flux	CO2 flux	µmol/m²/s	Kutzbach, Lars	Gap filled CO2 flux time series
12	Carbon dioxide, flux, quality classes	QC CO2 flux		Kutzbach, Lars	Quality flag of gap filled fluxes, between 0 and 3 (Reichstein et al., 2005)
13	Carbon dioxide, flux, standard deviation	CO2 flux std dev	±	Kutzbach, Lars	of gap filled flux estimates, calculated from the data used for averaging
14	Eddy covariance footprint, contribution of surface class	FP CC		Kutzbach, Lars	dry tundra
15	Eddy covariance footprint, contribution of surface class	FP CC		Kutzbach, Lars	wet tundra
16	Eddy covariance footprint, contribution of surface class	FP CC		Kutzbach, Lars	overgrown water
17	Eddy covariance footprint, contribution of surface class	FP CC		Kutzbach, Lars	open water

License:

Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported (CC-BY-NC-SA-3.0)

Size:

1782160 data points

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