Nocturnal basin low-level jets: an integrated study |
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Authors: | Joan Cuxart |
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Institution: | (1) Departament de Fisica, Universitat de les Illes Balears, Mallorca, Spain |
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Abstract: | Low-level jets (LLJs) are a very common feature in the nocturnal stably stratified boundary layer. Many factors can intervene
in their generation, linked basically to effects of baroclinity. A special kind of low-level jets is composed by the nocturnal
katabatic and basin flows, generated over terrain slopes. A study of observed LLJs in the Duero Basin is shown here, combining
observational data and modelling experiments. Normalized in respect to the maximum wind height, the dynamic characteristics
of the jets are similar: a two-layer system, with a stably stratified layer below the jet maximum and a near neutral layer
above, with a very stable layer separating them at the level of the wind maximum. There is vertical mixing above and below
the jet, and the connection between these layers takes place occasionally in a very turbulent manner. |
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Keywords: | low-level jet katabatic flows Duero Basin vertical mixing two-layer system large-eddy simulation mesoscale modelling |
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