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M J J A S O N D J F M A M

1987 1988

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Longueur du Jour-Moment Angulaire Atmosphérique (Données de la Nasa)

1970 1975 1980 1985 1990 1995 Annees

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AAAM et Index de l’ENSO

Moment Angulaire Atmospherique Indice ENSO

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1958-1997 (NCEP Data): 4383 pts, lissage a 36 pts

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Frequence w (Cycles/jour)

w*S(w)

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Z700 sur l’Atlantique Nord-Est

1958-1997 (NCEP Data): 4383 pts, lissage a 36 pts

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30-35 jours

1992 1993 1994

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Z a 700hPa (m) Moyenne sur 3 jours

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Hauteur du Geopotentiel a 700hPa

Point Pacifique Nord-Est: 150 W - 50 N

1992 1993 1994

Annees

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Z a 700hPa (m) Moyenne sur 3 jours

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Lag (days) -20

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Torques (N) and Angular Momenta (Nd)

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Integral of T

M and T cycle during 15-40 days Atlantic oscillations

47 cases, NCEP 1958-1997

b)

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