caa a22 4500 469052333 CHVBK 20180323132833.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF01029564 doi (NATIONALLICENCE)springer-10.1007/BF01029564 Heimann D. Institut für Physik der Atmosphäre Obserpfaffenhofen, Deutsche Forschungsanstalt für Luft-und Raumfahrt, Weßling, D-W-8031, Germany aut Three-dimensional modeling of synthetic cold fronts interacting with northern Alpine foehn [Elektronische Daten] [D. Heimann] Summary: The effect of the Alpine orography on prototype cold fronts approaching from the west is investigated by three-dimensional numerical model simulations. The numerical experiments cover a range of parameter constellations which govern the prefrontal environment of the front. Especially, the appearance and intensity of prefrontal northern Alpine foehn varies from case to case. The behaviour of a cold front north of the Alps depends much on the prefrontal condition it encounters. It is found that prefrontal foehn can either accelerate or retard the approaching front. An important feature is the pressure depression along the northern Alpine rim that results from the southerly foehn flow. In cases where this depression compensates the eastward directed pressure gradient associated with the largescale flow, the front tends to accelerate and the foehn breaks down as soon as the front passes. In contrast, the foehn prevents the front from a rapid eastward propagation if it is connected with a strong southerly wind component. No-foehn experiments are performed for comparison, where either the mountains are removed, or the static stability is set to neutral. Also shown are effects of different crossfrontal temperature contrasts. Springer-Verlag, 1992 Meteorology and Atmospheric Physics Springer-Verlag 48/1-4(1992-03-01), 139-163 0177-7971 48:1-4<139 1992 48 703 https://doi.org/10.1007/BF01029564 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01029564 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Heimann D. Institut für Physik der Atmosphäre Obserpfaffenhofen, Deutsche Forschungsanstalt für Luft-und Raumfahrt, Weßling, D-W-8031, Germany aut NATIONALLICENCE 773 0- Meteorology and Atmospheric Physics Springer-Verlag 48/1-4(1992-03-01), 139-163 0177-7971 48:1-4<139 1992 48 703 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 465671489 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer