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BIENNIAL WIND OSCILLATION [1 record]

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Record 1 2002-04-05

English

Subject field(s)
  • Climatology
  • Atmospheric Physics
DEF

Alternation of easterly and westerly wind regimes in the stratosphere, within about 12° of the equator, with a period varying from about 24 to 30 months. A new regime starts above an altitude of 30 km and propagates downward at a rate of about 1 km per month, the amplitude decreasing below about 23 km.

OBS

The term "quasi-periodic oscillation" is sometimes used for "quasi-biennial oscillation".

Key term(s)
  • quasi-periodic oscillation

French

Domaine(s)
  • Climatologie
  • Physique de l'atmosphère
DEF

Alternance des régimes de vents d'est et d'ouest dans la stratosphère, en-deçà de 12° environ de l'équateur, avec une période variant approximativement de 24 à 30 mois. Un nouveau régime commence au-dessus d'une altitude de 30 km et se propage vers le bas à la vitesse de 1 km par mois environ, l'amplitude décroissant en dessous de 23 km environ.

OBS

Une oscillation de même type qui a trait à l'ozone porte le nom d'oscillation de l'ozone total (total ozone oscillation, en anglais).

OBS

Attention à l'orthographe : «biennal», en français, mais «biennial», en anglais.

Key term(s)
  • oscillation biannuelle du vent
  • oscillation quasi biannuelle du vent

Spanish

Campo(s) temático(s)
  • Climatología
  • Física de la atmósfera
DEF

Cambios alternativos en los regímenes de vientos del este y del oeste, en la estratosfera, que se observan hasta unos 12° del ecuador con un período comprendido aproximadamente entre 24 y 30 meses. Un nuevo régimen se inicia a una altura de 30 km y se propaga hacia abajo a 1 km por mes, mientras que la amplitud decrece por debajo de 23 km.

Key term(s)
  • oscilación cuasibienal
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