Abstract
In a recently published work it was shown that Alpine cyclone development depends on a short wave trough upstream of the Alps, the presence of an upper-level jet streak in this trough, and a low-level front interacting with the mountain barrier. Specifically, by modifying the strength of the upper baroclinic zone (potential vorticity) or by decreasing the strength of the low-level baroclinic zone impinging on the Alps in an initial field, the intensity of the resulting numerically predicted cyclogenesis could be modulated. The major finding of the work was that the ALPEX cyclones reacted differently to upper-level and lower-level modification, providing a basis for broadly classifying storms: that is, dependence on upper-level processes and on low-level processes.
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