Bilan d'un siècle d'observation des sécheresses et des types de circulations atmosphériques associées à Rennes

Vincent Dubreuil 1 Olivier Planchon. 1
1 LETG - Rennes - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
Abstract : The aim of this study is to show the relations between the water balance calculated in Rennes (Brittany, western France) and the weather patterns. Homogeneized data series of temperature, precipitation and sunshine duration recorded at the weather station of Rennes for the 1880-2004 period were obtained in order to calculate the evapotranspiration according the Turc's formula at a monthly time-scale, and to show the interannual variability of the water balance. The atmospheric circulation patterns were identified using the Hess-Brezowsky classification. The results show that 47% of all circulation types were anticyclonic situations, including 71% of cyclonic situations in 1921. The proportion of anticyclonic situations was 49% in summer, including 10 years with a proportion of
above 70%. Significant but small correlations were shown between water deficits and frequency of anticyclonic situations (year: 0.51; summer: 0.59; spring: 0.46; autumn: 0.44).
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Vincent Dubreuil, Olivier Planchon.. Bilan d'un siècle d'observation des sécheresses et des types de circulations atmosphériques associées à Rennes. XXIIe Colloque de l'Association Internationale de Climatologie, Sep 2009, Cluj, Roumanie. pp.139-144. ⟨halshs-00414114⟩

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