Mullan B.A. (1989). Influence of Southern oscillation on New Zealand weather. In :
Picaut Joël (ed.), Lukas R. (ed.), Delcroix Thierry (ed.). Western Pacific international meeting and workshop on Toga Coare : proceedings. Nouméa : ORSTOM, p. 687-698. Western Pacific International Meeting and Workshop on Toga Coare, Nouméa (NCL), 1989/05/24-30.
Titre du document
Influence of Southern oscillation on New Zealand weather
Année de publication
1989
Type de document
Colloque
Auteurs
Mullan B.A.
In
Picaut Joël (ed.), Lukas R. (ed.), Delcroix Thierry (ed.)Western Pacific international meeting and workshop on Toga Coare : proceedings
Source
Nouméa : ORSTOM, 1989,
p. 687-698
Colloque
Western Pacific International Meeting and Workshop on Toga Coare, Nouméa (NCL), 1989/05/24-30
The Southern Oscillation is known to have a significant effect on New Zealand weather. In general, during the negative (El Nino) phase of the Oscillation, New Zealand experiences an increased frequency of cold southwesterly airstreams that result in more rain in the Southwest of the country, and dry conditions in the North and East. During the positive (La Nina) phase, there is a tendency for increased cyclonic activity in the North Tasman and more slow-moving or blocking anticyclones to the southeast of New Zealand. This results in frequent warm moist northerly or northeasterly airstreams over the country, with warmer than normal temperatures nation wide and wetter conditions in parts of the North Island exposed to these prevailing winds. The pressure anomalies in the New Zealand region associated with extremes of the Southern Oscillation Index show some seasonal variation. The anomalies are also not entirerly linear with respect to the value of the SOI. This paper examines differences between El Nino and La Nina conditions as their affect New Zealand, and then discusses the predicted and observed anomalies in New Zealand weather associated with the 1988/89 La Nina episode. (Résumé d'auteur)
Plan de classement
Climatologie / Météorologie [032CLIMET]
Descripteurs
CLIMATOLOGIE ; EL NINO ; ANOMALIE DE TEMPERATURE ; ENSO ; ANTICYCLONE ; 1988 1989
