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.
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Titolo: | On breakdowns of the Westerlies | |
Autori: | ||
Data di pubblicazione: | 1981 | |
Rivista: | ||
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. | |
Handle: | http://hdl.handle.net/11581/242727 | |
Appare nelle tipologie: | Articolo |