Swiss FluxNet Site Davos

This method is based on measurements of trace gas mixing ratios, using infrared gas analyzers (for CO2, H2O vapor) and laser spectrometers (for CH4 and N2O), combined with wind speed and wind direction measurements, using 3D sonic anemometers. To resolve the short-term turbulent fluctuations in the atmosphere, very fast measurements are needed: we measure at 10-20 Hz, i.e., 10-20 times per second. To assess the energy budget of each ecosystem, also radiation sensors and soil climate profiles are installed at the site. - Sub-canopy eddy fluxes (CO2, H2O, since 2023 also CH4). - Continuous profile concentration and forest floor flux measurement of CO2, H2O, CH4, N2O. - Auxiliary micrometeorology and soil climate measurements. __Data availability__ Near real-time flux and meteo data uploaded daily to the ICOS Carbon Portal.

Processed flux and meteo data are also available from the European Fluxes Database Cluster and part of Fluxnet2015 dataset. __Data policy__ ICOS data license: https://www.icos-cp.eu/data-services/about-data-portal/data-license __Detailed site info__: https://www.swissfluxnet.ethz.ch/index.php/sites/ch-dav-davos/site-info-ch-dav/