Text in bold refers to installations in use or measurements currently running.


Beginning of standard meteorological records at Davos (MeteoSwiss). The measurements are located 2 km from the Seehornwald Davos site.


Selection of the Seehornwald Davos research site for the Swiss project NRP14+ and start of the setup by R. Häsler et al.


Start of measurements at the Seehornwald Davos research site within the frame of NRP14+ with focus on forest decline:

  • Set up of the 35 m measurement tower and the 25 m steel frame around two trees.

  • Air chemistry monitoring (e.g. O3, NO, NO2, SO2) by W. Graber, later continued by NABEL.

  • Fine particular matter deposition (Zn, Pb, Cd) by Gehrig, EMPA

  • Microclimate profile through canopy by ETH

  • Wet and throughfall deposition by Klöti et al., EAFV. Restarted by A. Thimonier and M. Schmitt, WSL in 2009. (EAFV is the former name of the WSL).

  • Tree property measurements in a 0.25 ha plot (stem diameter, tree height, etc.). Restarted by M. Dobbertin, WSL in 2007.

  • Soil property measurements by Schindler (NABO) and Häsler et al. (EAFV).

  • Litterfall by P. Lüscher.

  • Continuous gas exchange measurement of branches by R. Häsler et al. (EAFV).

  • Fog sampling and chemical analyses by H. Turner, EAFV.




Start of continuous atmospheric NO, NO2, and O3 measurements within the Swiss national air pollution monitoring network (NABEL)


First attempts to measure the CO2 exchange with eddy covariance (EC) by R. Häsler and J. Böhm (WSL)


Installation of CO2 and microclimate profile on the 35 m tower by R. Häsler and J. Böhm (WSL)


Installation of automatic point dendrometer by R. Häsler, K. Herzog, and R. Zweifel (WSL)


Installation of Granier-type sap flow needles by R. Häsler, K. Herzog, and R. Zweifel (WSL)


Eddy covariance equipment reaches its full functionality at Davos by R. Häsler and J. Böhm (WSL)


Restart of growth, tree height, and stem diameter measurements by M. Dobbertin (WSL)


Closed-path system of eddy covariance was replaced by an open-path system


Removal of the 25 m steel frame around two trees (NFP14+)


Maintenance of eddy covariance, CO2 and microclimate profiles is transfered from R. Häsler (WSL) to W. Eugster and N. Buchmann et al. (ETHZ). Site becomes a core site of Swiss FluxNet.


An area of 25 x 70 m (1750 m2) within the NE-part of the footprint of the EC site was harvested at the end of October 2006.


Installation of manual and automatic circumference bands by M. Dobbertin and R. Zweifel (WSL)


Partial replacement of the original type of point dendrometers (LVTD, Agricultural Electronics Corporation, USA) by a less temperature sensitive type (ZB06/ZN12-T-WP, Natkon, Switzerland).



Integration of the site into the UN/ECE-ICP Forest Long-term forest monitoring network (LWF, WSL):

  • Annual crown condition assessment (2006)

  • LAI measurements (hemispherical photos, Licor LAI 2000) by A. Thimonier and M. Schmitt, WSL (2006)

  • Bi-annual forest health monitoring (2007)

  • Vegetation assessment every 2-4 years (2008)

  • Soil parameters by S. Zimmermann (2008)

  • Additional soil water conditions sensors by P. Waldner, E. Graf Pannatier (2008 and 2009)

  • Additional litterfall sampling (Swiss ICP-Forest Level II plot equipment)



Radiation measurement below canopy by T. Jonas (SLF/WSL)


Heavy truck traffic through the Seehornwald Davos research site due to construction work on a nearby avalanch protection for the railway line of the Rhätische Bahn.


Stem and soil respiration measurements by S. Etzold et al. (ETHZ)


Continuous stem CO2 measurements by S. Etzold (ETHZ) and R. Zweifel (WSL)


New 10 year contracts with the land owners of the Seehornwald Davos research site


Construction work of the Hotel Stilli Davos start in July 2011 (at the edge of the footprint of the eddy tower)


Data acquisition system renewed and modernised. Research cabin and site cleaned from leavings of old scientific projects, P. Plüss (ETHZ), T. Baur (ETHZ), W. Eugster (ETHZ), M. Häni (ETHZ), R. Zweifel (WSL). 23-25 August 2011.


Installation of additional stem CO2 sensors, M. Häni (ETHZ), R. Zweifel (WSL). 25 August 2011.


Research site Seehornwald Davos joins TREENET - The biological drought and growth indicator network


Research site goes ICOS - Integrated Carbon Observation System

SNF, ETHZ, WSL and EMPA fund first ICOS Switzerland budget period 2013-2017 including the sites Seehornwald Davos (Ecosystem station) and Jungfraujoch (Atmosphere station)


Research site gets an additional 5 m buffer zone around the core area. Opening up new possibilities for research partners to establish projects


Renewed contracts with land owners of the Seehornwald Davos research site


Start of the upgrade to ICOS class 1 standards. Greenhouse gas measurements (CO2, H2O, CH4 and N2O) using the eddy covariance technique (measured and maintained by ETH Zurich), meteorology (by EMPA/NABEL), and measurements of tree width, stem CO2 exchange as well as leaf area index, biomass, N losses etc. (by WSL Birmensdorf/LWF/TreeNet)


Half a dozen trees were felled and their biomass fractions analysed (needles, branches, stem), dead wood was quantified and all the data were combined to obtain a detailed biomass inventory of the site, which will be used to cross-validate the flux measurements (ICOS)


Hemispherical photos to estimate ‒ together with leaf area samples ‒ the leaf area index (LAI) of the forest vegetation (ICOS).


Development and installation of first, automated soil GHG flux measurement chambers by P. Meier et al (ETH/ICOS)


Development and installation of a valve switching system for eddy measurements and the storage and chamber measurements of CO2, CH4 and N2O. New infrastructure allows for two independent gas analysers and also the measurement of two different systems (chambers and EC) with one single analyser by P. Meier et al (ETH/ICOS)


SNF funds second Swiss ICOS budget period 2017-2021


60 soil profils down to a depth of 1 m dug and analysed by S. Zimmermann et al (WSL/ICOS)


ICOS CLASS 1 Label for the research station Seehornwald Davos CH-DAV.


Finializing the setup of ICOS requested biomass sampling design (new and enlarged vegetation measurement plots: 20 SP-plots and 4 CP-plots)


SNF and SERI fund ICOS Switzerland Phase 3 (2021-2025)


Spectacular helicopter operation by the Davos Forestry Service (video 1, video 2)