Pressure drag on the Dinaric Alps during the ALPEX SOP |
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| Authors: | V Tuti? B Ivan?an-Picek |
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| Institution: | (1) Present address: Hydrometeorological Institute of Croatia, Gri 3, YU-41000 Zagreb, Croatia, Yugoslavia |
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| Abstract: | Summary During the ALPEX SOP (March–April, 1982), microbarographic measurements were conducted on the Northern Adriatic as a part of research on the Bora. In this paper the measured pressure field around the Dinaric Alps is used to compute the total pressure drag vectors using Archimedes law.The 3-hourly temporal variations of these drag vectors is examined for different synoptic events. During the anticyclonic calm weather period at the end of March and beginning of April there is evidence of a divrnal drag variation. Regardless of magnitude, the pressure drag vectors seem to be aligned almost perpendicular to the main mountain ridge. During synoptic scale flow developments the drag direction change usually appears steady and slow (1–2 days). However during an exceptionally strong frontal passage (8/9 April) this time scale was much shorter (3–6 hours). The maximae of the pressure drag during SOP are always connected with Bora periods and the magnitudes of the drag values indicate that during these events there is a major sink of atmospheric momentum over the Dinaric Alpine region.With 11 Figures |
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