Turbulent Exchange processes between Forested areas and the Atmosphere
DFG priority program 1276 "Metström"
DFG priority program 1276 "Metström"
Project "Turbulent Exchange processes between Forested areas and the Atmosphere" (TurbEFA)
Actual Presentations
Metström Workshop: DERIVING MODEL PARAMETERS FROM FIELD DATA WITH SPECIAL FOCUS ON TALL VEGETATION
20th Symposium on Boundary Layers and Turbulence, Boston, MA
Cooperating Institutions
- Institute for Hydrology and Meteorology,
Chair of Meteorology - Institute for Aerospace Engineering,
working group for "Experimentelle Aerodynamik" - Institute of Photogrammetry and Remote Sensing,
Chair of Photogrammetry - Institute of Fluid Mechanics,
Chair of Fluid Mechanics
Project Description:
The aim of this interdisciplinary project is to investigate the effects of forest edges and in-homogeneities on the turbulence of atmospheric flows in the boundary layer and their representation in numerical models as well as their influence on long term measurements of turbulent fluxes over the forest. The project focuses particularly on the dispersion of trace gases (i.e. CO2 and pollutants) within forest canopies.
Investigating the fluid dynamics on the small scale of forest edges and clearings applying Large Eddy Simulation (LES) we aim to improve the parameterization of closure models for Atmospheric Boundary Layer models (ABLM). The 1D-ABLM (HIRVAC), which encompasses sub-models for radiation transfer and energy distribution in the canopy as well as assimilation processes and soil water transfer, will be expanded to a 2D Version at the same time.
Experiments in the field and in the wind tunnel will be used to determine parameters for the numerical models and to derive parameter models. Furthermore the data serve for the validation of the numerical results and the adaptation of the model resolution.
The results of the project will lead us to a new assessment of the standard flux measurements (Fluxnet) and to a quantification of the uncertainties in the measured fluxes. They shall bring a contribution to improve the parameterization of the boundary conditions of atmospheric model systems.
The work is supported by the German National Science Foundation (Deutsche Forschungsgemeinschaft, DFG) within the DFG priority programme 1276 MetStröm.
