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Case studies of the bora wind. Numerical simulations in three dimensions
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Meteorology.
1996 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Two days with bora has been numerically analysed, using a three dimensional hydrostatic mesoscale model developed at the Department of Meteorology, Uppsala University. The two simulated days, 22 March and 15 April 1982, have been compared to aircraft measurements done during the ALPEX-SOP in 1982. The model area was the northeastern shore of the Adriatic Sea.

The bora on 15 April was easier to simulate than the one on 22 March, mostly due to the fact that this bora was shallower than the one on 22 March, and since the used model is developed for mesoscale studies, it works better with smaller scales (on the mesoscale). The simulations show that the bora character is a function of both time and space, for example changes in turbulence intensity. Three dimensional effects play an important role, for example channeling effects, which was also confirmed by the simulations.

Compared to measurements, the model simulates the two days well, especially 15 April. All the significant features of the bora wind were well simulated, the wind speed maximum at the ridge crest, the descent of isotherms and isolines of specific humidity downstream the crest, channeling effects etc. The turbulence was not always present just above the ridge crest, but at some times and some places it was well simulated. The most difficult variables to simulate was the specific humidity and the potential temperature. 

Place, publisher, year, edition, pages
1996. , p. 30
National Category
Meteorology and Atmospheric Sciences
Identifiers
URN: urn:nbn:se:uu:diva-392284OAI: oai:DiVA.org:uu-392284DiVA, id: diva2:1347678
Subject / course
Meteorology
Educational program
Matematisk-naturvetenskaplig linje
Available from: 2019-09-02 Created: 2019-09-02 Last updated: 2019-09-06Bibliographically approved

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