TRACER EXPERIMENTS IN THE FREIBURG-SCHAUINSLAND AREA - COMPARISON WITH FLOW AND DISPERSION MODELS

Two chains of flow and dispersion models were compared with data of a tracer experiment which took place near the Schauinsland mountain in o rder to test their applicability for instationary situations in orogra phically structured terrain. A diagnostic model was initialized with o bservational wind data and coupled with a Gaussian puff model. Secondl y a prognostic model was driven by numerical weather prediction (NWP) data via multiple passive nesting and linked with a Lagrangean dispers ion model. Although both model chains were able to simulate the basic feature of the dispersion situation the prognostic one altogether led to better results.