The transition of the middle-latitude atmospheric circulation from “zonal” to “meridional” type is known to occur in connection with the growth of local disturbances characterized by a very low mobility. This process is very frequent over Europe, where it leads usually to a blocking situation. In this paper, the physical conditions that determine the growth and the motion of localized disturbances (wave packets) in a rotating (β-plane) westerly flow are analysed for various mechanisms of instability. The results are discussed in the light of what is known from available data.
On breakdowns of the Westerlies
SPERANZA, Antonio
1981-01-01
Abstract
The transition of the middle-latitude atmospheric circulation from “zonal” to “meridional” type is known to occur in connection with the growth of local disturbances characterized by a very low mobility. This process is very frequent over Europe, where it leads usually to a blocking situation. In this paper, the physical conditions that determine the growth and the motion of localized disturbances (wave packets) in a rotating (β-plane) westerly flow are analysed for various mechanisms of instability. The results are discussed in the light of what is known from available data.File in questo prodotto:
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