cops_nebt_imk1etg_flux_d: Eddy-covariance turbulence data of the energy balance network (NEBT) operating during COPS 2007: station IMK1ETG (Hornisgrinde)
The energy balance station IMK1ETG (Hornisgrinde) measured high-frequency (20 Hz) eddy-covariance raw data with a Solent R1012 (Gill Instruments Ltd.) sonic anemometer and a LI-7500 (LI-COR Biosciences) hygrometer above the target land use type heath. The measuring set-up was continuously running during the entire COPS measurement period in order to provide a complete time series of the turbulent fluxes of momentum, sensible and latent heat as well as carbon dioxide. Post-processing was performed using the software package TK2 (developed by the Department of Micrometeorology, University of Bayreuth) which produces quality assured turbulent flux data with an averaging interval of 30 min. The documentation and instruction manual of TK2 (see entry cops_nebt_ubt_info_1) and additional references about the applied flux corrections and post-field data quality control (see entry cops_nebt_ubt_info_2) as well as a document about the general handling of the flux data can be found in supplementary pdf-files within the energy balance and turbulence network (NEBT) experiment of the data base. The turbulent flux data in this data set are flagged according to their quality and checked for an impact of possible internal boundary layers. Additionally, the flux contribution from the target land use type intended to be observed to the total flux measured was calculated applying footprint modeling. Information and references about the internal boundary layer evaluation procedure and the footprint analysis are also given in the additional pdf-files. Pictures of the footprint climatology of the station as related to the land use and to the spatial distribution of the quality flags are included in the corresponding additional info pdf-file (see cops_nebt_imk1etg_info_1).
Energy balance site location (imk1etg) at COPS-Supersite Hornisgrinde, Germany: Longitude 8.201
Altitude: 1158 m relativ to NN
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To determine the accuracy of flux measurements, the sonic anemometer sensor type, as well as the classification of the turbulent flux data according to their quality (Foken et al., 2004) can be used (Mauder et al., 2006). Depending on the type of construction of the sonic anemometer, it can be classified as type A or type B (Foken and Oncley, 1995). The Solent R1012 sonic anemometer was classified as type B. In combination with the TK2 quality flags of the turbulent fluxes the accuracy of the flux measurements (sensible and latent heat, for the friction velocity similar percentages can be assumed) can be assessed as follows: For Type B (Solent R1012): For quality flags ranging from 1 to 3: Accuracy of sensible heat flux: 10 % or 20 Wm-2 Accuracy of latent heat flux: 15 % or 30 Wm-2 For quality flags ranging from 4 to 6: Accuracy of sensible heat flux: 15 % or 30 Wm-2 Accuracy of latent heat flux: 20 % or 40 Wm-2 References: Foken, T., Goeckede, M., Mauder, M., Mahrt, L., Amiro, B.D., Munger J. W., 2004. Post-field data quality control. In: X. Lee, W. Massman, B. Law (Eds.), Handbook of Micrometeorology, A Guide for Surface Flux Measurement and Analysis, Kluwer, Dordrecht, pp. 181-208. Foken, T., Oncley, S.P., 1995. Workshop on instrumental and methodical problems of land surface flux measurements. Bulletin of the American Meteorological Society, 76: 1191-1193. Mauder, M., Liebethal, C., Goeckede, M., Leps, J.P., Beyrich, F., Foken, T., 2006. Processing and quality control of flux data during LITFASS-2003. Boundary-Layer Meteorology, 121: 67-88.
No data are available: from 09 July 2007 to 12 July 2007 from 18 August 2007 to 19 August 2007