Editorial Type:
Article
Article Type:
Research Article

Spatial and Temporal Variability of Rainfall in the Alps–Mediterranean Euroregion

Jean-François Rysman Université Pierre-et-Marie-Curie University of Paris 06, Paris, Université Versailles St-Quentin, Versailles, and CNRS/INSU, Laboratoire Atmosphères, Milieux, Observations Spatiales, Institut Pierre-Simon Laplace, Guyancourt, France

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Yvon Lemaître Université Pierre-et-Marie-Curie University of Paris 06, Paris, Université Versailles St-Quentin, Versailles, and CNRS/INSU, Laboratoire Atmosphères, Milieux, Observations Spatiales, Institut Pierre-Simon Laplace, Guyancourt, France

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Emmanuel Moreau Novimet, Guyancourt, France

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Print Publication:
01 Mar 2016
DOI:
https://doi.org/10.1175/JAMC-D-15-0095.1
Page(s):
655–671
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Abstract

This study describes the main patterns of rainfall distribution in the Alps–Mediterranean “Euroregion” using a ground radar and characterizes the associated processes using model output. The radar dataset spans 2009–12 with fine spatial (1 km) and temporal (5 min) resolutions. The most significant rain accumulations were observed in 2009 and 2010, and the most intense extreme events occurred in 2010. Conversely, 2012 was a dry year. Model output revealed that the wind shear, the pressure, and the meridional wind at low level were the three main factors explaining the rainfall variability between 2009 and 2012. At the monthly scale, the maximum of rain accumulation was observed in November along the coast. Results also showed that the most intense rain rates were observed during early summer and autumn in the “Pre-Alps.” The monthly variability was characterized by a displacement of extreme rain events from land to sea from late spring to winter. Correlation analyses showed that this displacement was essentially controlled by the convective available potential energy (CAPE). Rainfall showed a diurnal variability from April to August for the land areas of the Alps–Mediterranean Euroregion. The diurnal variability was significant during the spring and summer months, with maximal rain intensity between 1600 and 1800 UTC. The correlation of the rainfall with CAPE showed that this cycle was related to atmospheric instability. A secondary peak in average rain rate was observed during the early morning and was likely triggered by land breezes. The results highlighted that rainfall characteristics are extremely diverse in terms of intensity and distribution in this relatively small region.

Corresponding author address: Jean-François Rysman, LATMOS, 11 Boulevard d’Alembert, 78280 Guyancourt, France. E-mail: rysman@latmos.ipsl.fr

Abstract

This study describes the main patterns of rainfall distribution in the Alps–Mediterranean “Euroregion” using a ground radar and characterizes the associated processes using model output. The radar dataset spans 2009–12 with fine spatial (1 km) and temporal (5 min) resolutions. The most significant rain accumulations were observed in 2009 and 2010, and the most intense extreme events occurred in 2010. Conversely, 2012 was a dry year. Model output revealed that the wind shear, the pressure, and the meridional wind at low level were the three main factors explaining the rainfall variability between 2009 and 2012. At the monthly scale, the maximum of rain accumulation was observed in November along the coast. Results also showed that the most intense rain rates were observed during early summer and autumn in the “Pre-Alps.” The monthly variability was characterized by a displacement of extreme rain events from land to sea from late spring to winter. Correlation analyses showed that this displacement was essentially controlled by the convective available potential energy (CAPE). Rainfall showed a diurnal variability from April to August for the land areas of the Alps–Mediterranean Euroregion. The diurnal variability was significant during the spring and summer months, with maximal rain intensity between 1600 and 1800 UTC. The correlation of the rainfall with CAPE showed that this cycle was related to atmospheric instability. A secondary peak in average rain rate was observed during the early morning and was likely triggered by land breezes. The results highlighted that rainfall characteristics are extremely diverse in terms of intensity and distribution in this relatively small region.

Corresponding author address: Jean-François Rysman, LATMOS, 11 Boulevard d’Alembert, 78280 Guyancourt, France. E-mail: rysman@latmos.ipsl.fr
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