Original raw high-frequency eddy covariance data and on-site processed turbulent fluxes for the year 2025 from above the forest canopy at Hartheim Forest Research Site (ICOS Associate Ecosystem Site DE-Har, UFR Code: HARTHM, 7.59814ºE, 47.93391ºN, 201 m). The eddy covariance system was operated at 29 m on the site's main 30 m tower facing west using an CSAT3 ultrasonic anemometer and a Licor Inc. Li-7200RS enclosed-path analyzer connected to a SmartFlux system running Eddy Pro from Licor Inc. in Express Mode. For final processed and quality-controlled fluxes, please download the official ICOS data available for DE-Har through the ICOS Carbon Portal and please cite the original ICOS dataset: Christen, A., Baab, F., Kolbe, S., Plapp, T., Redepenning, D., Schindler, D. (2025). ETC L2 Fluxnet (half-hourly) from Hartheim, 2020–2024, ICOS RI, https://hdl.handle.net/11676/cZo501fvhRAq-THssFhKz5D4 This repository only provides the underlying raw unchecked, unfiltered and original data from the DE-Har system not available above for purposes of documentation and future reprocessing. Use with caution. The orginical high-freuqency (20 Hz) data are available as LICOR .ghg files packaged in monthly tarball archives (e.g. 2025-01.tar contains all .ghg files of the SmartFlux system for the month of January) The processed fluxes from the on-site system are available in one combined annual summary file "DE-Har-SmartFlux-Combined-2025.csv") Note: All times (both ghg and Summary) are provided in UTC, not local time. Specific notes on the 2025 dataset: Due to a technical failure of the Li7200, there are no data available data between 2025-09-09 and 2025-10-06. The sensor has been sent for repair and re-calibration. The system was re-installed on 2025-10-07T 08:30 UTC Data bewteen 2025-10-07 and 2025-11-27 were recorded at 10 Hz instead of 20Hz. The sensor has been changed back to 20 Hz on 2025-11-27. 

COPYRIGHT Creative Commons Attribution 4.0 International. Copyright Albert-Ludwigs-Universität Freiburg, Professur für Umweltmeteorologie, Werthmannstrasse 10, Freiburg, Germany. CREATOR This work was created by the University of Freiburg, Germany. ATTRIBUTION The site is operated as part of the Integrated Carbon Observation System (ICOS). Instruments and sensors in the dataset were operated by the Chair of Environmental Meteorology, University of Freiburg, Germany. DISCLAIMER The use of the work is at the user's own risk. The authors and/or the involved institutions, accept no liability for material or non-material damage arising from the use or non-use or from the use of incorrect or incomplete information in this work. The author and/or the involved institutions are not responsible for any use that may be made of the information in this work. The legal provisions remain unaffected. MATERIAL NOTICE The notices cover data in databases, text and images contained in the work. MATERIAL URI Hartheim Forest Research Site DE-Har in the ICOS Carbon Portal