Dataset Open Access
Nieberding, Felix; Ma, Yaoming; Wille, Christian; Fratini, Gerardo; Asmussen, Magnus Ole; Wang, Yuyang; Ma, Weiqiang; Sachs, Torsten
The data set contains nearly 15 years of eddy covariance data from an alpine steppe ecosystem on the central Tibetan Plateau. The dataset was processed following standardized quality control methods to allow for comparability between the different years of our record and with other data sets. To ensure meaningful estimates of ecosystem-atmosphere exchange, careful application of the following correction procedures and analyses was necessary: (1) Due to the remote location, continuous maintenance of the EC system was not always possible, so that cleaning and calibration of the sensors was performed irregularly. Furthermore, the high proportion of bare soil and high wind speeds led to accumulation of dirt in the measurement path of the IRGA. The installation of the sensor in such a challenging environment resulted in a considerable drift in CO2 and H2O gas density measurements. If not accounted for, this concentration bias may distort the estimation of the carbon uptake. We applied a modified drift correction procedure following Fratini et al. (2014) which, instead of a linear interpolation between calibration dates, uses the CO2 concentration measurements from the Mauna Loa atmospheric observatory as reference time series. (2) We applied rigorous low frequency quality filtering to retain only flux measurements which represent actual physical processes. (3) During the long measurement period, there were several buildings constructed in the near vicinity of the EC system. We investigated the influence of these obstacles on the turbulent flow regime and conducted a footprint analysis to identify fluxes with uncertain land cover contribution and exclude them from subsequent computations. (4) We applied a correction for instrument surface heating during cold conditions (Burba et al. 2008), following the approach of Oechel et al. (2014). (5) Subsequently, we applied the traditional and widely used gap filling procedure following Reichstein et al. (2005) to provide a more complete overview of the annual net ecosystem CO2 exchange. (6) We estimated the random uncertainty following Finkelstein and Sims (2001) and analyzed the error propagation through the WPL correction to get an estimation of the accuracy of the measurements.
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Nieberding, F., Wille, C., Fratini, G., Asmussen, M. O., Wang, Y., Ma, Y., and Sachs, T.: A Long Term (2005–2019) Eddy Covariance Data Set of CO2 and H2O Fluxes from the Tibetan Alpine Steppe, Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2020-63, in review, 2020.