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LARGE-SCALE-FLOW INTERACTIONS WITH THE ALPS AND THEIR IMPACT ON THE LOW-LEVEL TEMPERATURE FIELD IN THE NORTHERN FORELAND
Günther Zängl
; Meteorologisches Institut der Universität München, Theresienstraße 37, D-80333 München, Germany
Sažetak
Numerical simulations are presented to examine the sensitivity of the temperature field in the northern Alpine foreland on the large-scale wind direction. The simulations are set up such that changing the wind direction does not create any large-scale systematic temperature advection, thereby isolating the effects of the flow interaction with the Alps. The results show indeed an appreciable impact. In the afternoon, temperatures tend to be higher for southerly flow directions than for northerly ones, as might be expected from the fact that subsidence in the lee of the Alps causes warming while upslope flow is related to cooling. In the morning, however, the lowest temperatures are found for easterly directions while northwesterly flow shows the highest temperatures, followed by westerly flow. The primary reasons for this behaviour are the asymmetry of the flow around the Alpine massif as a whole and the interaction of the friction-induced ageostrophic wind component with the Alps.
Ključne riječi
Numerical modelling; mountain effects; boundary layer
Hrčak ID:
64610
URI
Datum izdavanja:
15.12.2005.
Posjeta: 901 *