engleski

Pannonian Basin Nocturnal Boundary Layer and Fog Formation: Role of Topography

Under high-pressure systems, the nocturnal atmospheric boundary layer in the PannonianBasin is influenced by gravity flows generated at the mountain ranges and along the valleys, determin-ing the variability of wind and temperature at a local scale and the presence of fog. The mechanismsat the mountain foothills are explored at Zagreb Airport using data from a sodar and high-resolutionWRF-ARW numerical simulations, allowing identification of how the downslope flows from thenearby Medvednica mountain range condition the temperature inversion and the visibility at nightand early morning. These flows may progress tens of kilometres away from the mountain ranges, merging with valley flows and converging in the central areas of the basin. The ECMWF modeloutputs allow us to explore the mesoscale structures generated in form of low-level jets, how theyinteract when they meet, and what is the effect of the synoptic pressure field over eastern Europe, toillustrate the formation of a basin-wide cold air pool and the generation of fog in winter.

Pannonian Basin ; nocturnal atmospheric boundary layer ; low-level jets ; downslope flows ; fog ; basin-scale flows

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