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International audienceThe aim of this work was to contribute to increase knowledge on fine scale climate in a wine region of Uruguay. Temperature variability was studied in relation to local atmospheric circulation in the coastal Montevideo and Canelones wine regions in southern Uruguay. Temperature data loggers were installed in commercial vineyards according to topography and distance from the La Plata river estuary. Observed temperature data from nine sensors and complementary climatic data of humidity and wind (velocity and direction) from two automatic stations, located at 0.8 and 14.8 km from La Plata river were analyzed over three growing seasons (September to March of 2012, 2013 and 2014). The analysis of hourly wind data allowed identifying the development of sea breeze over the wine region during the ripening period. The drop in temperature reached more than 4ºC between 10:00 to 14:00 (Local hour) at the south-facing plots, during the hottest day of summer 2012. With a shorter duration and less intensity, the drop in temperature was observed 30 km inland. Under extreme thermal conditions for grapevine during the ripening period, the sea breeze impact on temperature in the wine region could be of importance in reducing the thermal stress for plant functioning, like photosynthesis activity and berry synthesis and accumulation components

Circulation atmosphérique locale et impacts thermiques dans un vignoble côtier : observations dans le sud de l’Uruguay