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In the alpine region, tracer experiments were conducted in the past to simulate air mass transport in mountainous regions. For one of these experiments (TRANSALP 1990), the model RAMS is used to calculate the flow, in its non hydrostatic configuration, due to the highly complex terrain. RAMS was initialised with a vertical profile from the campaign and a multiple nested grid configuration was selected to solve both local flow and large scale circulation over the area. Two turbulence closure schemes are employed in the model and their effect on the circulation are analysed. The time-dependent RAMS fields are used to drive the Lagrangian particle model MONTECARLO. The effect on the dispersion of the turbulence parametrizations and boundary layer depth representations is investigated. Both meteorological and concentration models outputs are compared with some observations. Results of the comparison show that the main characteristic of the flow are well reproduced and the general features of the tracer dispersion are correctly simulated.

Additional information

Authors: SALIN P, JRC Ispra (IT);GROSSI P, JRC Ispra (IT);GRAZIANI G, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Air Pollution 97, Bologna (IT), September 16-18, 1997
Availability: Available from (1) as Paper EN 40767 ORA
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