University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Doctoral Thesis:
Irene Schicker
(2017):
INFLUENCE OF HORIZONTAL RESOLUTION, LANDUSE AND SOIL MOISTURE OF ON SIMULATIONS
OF METEOROLOGICAL CONDITIONS IN COMPLEX TERRAIN.
Doctoral Thesis - Institut für Meteorologie (BOKU-Met),
BOKU-Universität für Bodenkultur,
pp 94.
UB BOKU
obvsg
- Abstract:
- Local and regional meteorological conditions are significantly influenced by topography, land surface characteristics, land use and vegetation. This poses a special challenge for meteorological models in regions with complex topography. In the Alps with narrow valleys, high horizontal and vertical resolution is needed; at least four to five grid points inside the vally cross-section are required. To achieve this, highly-resolved input fields of topography, land-use, etc. are needed. A "truly horizontal" diffusion scheme, numerical stability and a suitable boundary layer parameterisation are important as well. What is the effect, if the horizontal resolution of the simulation is increased? Is it possible to resolve meteorological conditions in a mountain valley sufficiently well? Which boundary layer parameterisation and which numerical diffusion scheme should be applied? Which influence do the model built-in land-use data have and can the simulation skill be improved if more recent land-use data are used? In order to answer these questions, simulations using two meteorological models, MM5 (5th-Generation Penn State / NCAR Mesoscale Model) and the WRF (Weather Research and Forecasting) model, were used. Simulations answering the first three questions were performed with MM5 for winter smog conditions in the Inn valley using different horizontal resolutions, boundary-layer schemes and diffusion schemes. To answer the last question, the WRF model was applied for the Inn Valley and the Vienna Basin. Results presented in this PhD thesis highlight the importance of high horizontal resolution as well as accurate and up-to-date land-use data in regions with complex terrain. The significance of using a truly horizontal diffusion is shown. It is also pointed out that the initialisation of soil moisture plays a crucial role in reproducing atmospheric conditions.
- Betreuer: Seibert Petra
- 1. Berater: Kromp-Kolb Helga