séminaire de climatologie – jeudi 28 septembre 2017

rayonnement reunionCaractérisation de la variabilité temporelle du rayonnement solaire sur l'île de La Réunion et son lien avec la large échelle

Pauline Mialhe, doctorante à l'université de La Réunion

Jeudi 28 septembre à 15 h 30, salle des cours du CRC

 

 

This study aims to examine the solar radiation variability over La Réunion island and its relationship with large scale circulation. The Satellite Application Facilityon Climate Monitoring (CMSAF) produces a Shortwave Incoming Solar radiation (SIS) data record called Solar surfAce RAdiation Heliosat - East (SARAH-E). A comparison to in situ observations from Météo-France measurements networks quantifies the skill of SARAH-E grids which we use as dataset.

First step of the work, irradiance mean cycles are calculated to describe the diurnal-seasonal SIS behaviour over La Réunion island. By analogy with the climate anomalies, instantaneous deviations are computed after removal of the mean states. Finally, we associate these anomalies with larger-scale atmospheric dynamics into the South West Indian Ocean by applying multivariate clustering analyses (Hierarchical Ascending Classification, k-means).