ExchanGE processes in mountainous Regions - Intensive Observation Periode 2


From 05/2008 to 07/2008

Experiment manager: Thomas Foken
Staff: Andrei Serafimovich, Lukas Siebicke, Katharina Köck (Staudt), Tobias Biermann, Tobias Gerken, Martina Hunner, Michael Riederer, Friederike Rütz, Stephanie Dix (Schier), Johannes Lüers, Johannes Olesch

The second measuring campaign was planned as an extension of the first one. Six eddy-covariance systems were installed below, within and above the canopy at the slim tall turbulence tower. An additional eddy-covariance system was installed at the top of the main tower. Each EC-system additionally was equipped with a 2-axis inclinometer. The acquisition system allowed ideal time synchronization via GPS of all flux systems from the main tower and the turbulence tower including the advection measurements, the basis for the detection of coherent structures at all measuring points. An internet connection allowed remote supervision of the system from Bayreuth.

The setup for horizontal advection measurements was substantially improved, featuring a multi-analyzer design with multiple high frequency synchronous concentration measurements with a time resolution of 1 Hz. Calibration and statistical postprocessing methods were developed to address potential uncertainties of CO2 concentration gradients related to the multi-analyzer setup. Vertical advection was studied investigating different approaches to estimate vertical wind velocity. This included various ways of coordinate rotation, looking at a wide range of temporal scales.

To investigate convective processes the Modified-Bowen-Ratio system was set up at the clearing site. In addition a meteorological station was installed consisting of a net radiometer to measure all components of the radiation budget as well as soil thermometers, TDR probes and soil heat flux plates.

The atmospheric boundary layer was profiled with an acoustic and radioacoustic radar remote sensing system (SODAR-RASS). In contrast to IOP1 during IOP2 a second miniSODAR without a RASS-extension was used additionally. Site scale observations were linked to larger vertical scales in the troposphere by wind profiler measurements at Bayreuth, operated by the German Meteorological Service and by mesoscale Weather Research and Forecasting (WRF) model simulations, run within the project.

EGER_Turb_Tower_vonuntenEGER Main Tower

Turbulence tower Main Tower

EGER Advection AnalysersEGER_Incanopy Radiation

Analysors for advection In canpoy radiation

Related links:
  • Diploma Thesis: Besonderheiten der vertikalen Windverteilung am Waldstein
  • Diploma Thesis: Investigation of advection and the wind field in a spruce forest
  • Project: DFG Fo 226/16-1: Turbulence and stand scale modelling

last modified 2010-02-05