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Original Articles

Recent trends in precipitation in Eastern Canada: Research note

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Pages 140-145 | Received 30 Dec 1988, Published online: 19 Nov 2010
 

Abstract

The changes in normal precipitation amounts from 1931–60 to 1951–80 are examined for stations in Eastern Canada. The area covered comprises the Maritime Provinces and those parts of Ontario and Quebec south of a line approximately 200 km north of Lakes Erie and Ontario and the St Lawrence River. Changes are computed for each of the four seasons and for the entire year. On the whole, precipitation has increased, especially in winter and summer. However, there is considerable variation throughout the area, with precipitation decreasing in some regions. General circulation models that simulate the effect of doubling atmospheric CO2 also show an increase in precipitation.

Résumé

On étudie les changements dans les hauteurs normales de précipitation entre les périodes 1931–1960 et 1951–1980 pour des stations de l'est canadien. La région étudiée couvre les Maritimes, V Ontario et le Québec au sud d'une ligne 200 km au nord des lacs Érié et Ontario et du Saint‐Laurent. On calcule les changements pour chacune des saisons et pour l'année entière. Globalement, les précipitations ont augmenté, surtout l'hiver et l'été. Toutefois, on trouve des variations importantes, certaines régions en recevant moins. Les modèles de circulation générale qui simulent l'effet du doublement du CO2 atmosphérique montrent aussi une augmentation de la précipitation.

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