EGU22-6831
https://doi.org/10.5194/egusphere-egu22-6831
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Variability of the Surface Solar Radiation over Reunion island and its interaction with the synoptic, intraseasonal and interannual convective variability

Chao Tang1, Pauline Mialhe1, Benjamin Pohl2, Béatrice Morel1, Shunya Koseki3, Babatunde Abiodun4, and Miloud Bessafi1
Chao Tang et al.
  • 1LE2P, ENERGY-lab, Université de La Réunion, La Réunion, France
  • 2Centre de Recherches de Climatologie, UMR6282 Biogéosciences, CNRS/université de Bourgogne Franche-Comté, 6 boulevard Gabriel, 21000 Dijon, France
  • 3Geophysical Institute, University of Bergen / Bjerknes Centre for Climate Research, Bergen, Norway
  • 4Climate System Analysis Group, Department of Environmental and Geographical Sciences, University of Cape Town, Cape Town, South Africa

The impacts of large scale climate variabilities on the solar energy resource are widely investigated around the world, however their effects are not yet clear for Mascarene Islands (southwest Indian Ocean, SWIO) and needs to be addressed. In this study, surface solar radiation (SSR) classification and anomalies at the diurnal scale from SARAH-E satellite product over Reunion Island are linked to the large scale climate variabilities in SWIO region. These climate variabilities include Tropical Cyclones (TCs) and the Tropical Temperate Troughs (TTTs) at the synoptic scale, the Madden–Julian Oscillation (MJO) at the intraseasonal scale, and the Indian Ocean Dipole (IOD), the Subtropical Indian Ocean Dipole (SIOD) and the El Niño–Southern Oscillation (ENSO) at the interannual scale.
We identified the variability of SSR at various time scales where both local processes and the large scale convective variabilities play important roles. At the synoptic and intraseasonal timescales, the local variability of SSR over Reunion shows a significant association with TCs, TTTs and the MJO. The sign and amplitude of SSR diurnal anomaly are found to be correlated with the enhanced- / depressed- convective phase and amplitude of these events. The SSR anomaly is strongly altered with the presence of nearby TCs, with a value of up to about 30% of climatology, although at low occurrence; TTTs and MJO have relatively weaker impact, with a value of about 13% and 5% respectively. At the interannual timescale, IOD, SIOD and ENSO have relatively much less importance on local SSR variability. The daily total solar energy density has been calculated for all these variabilities to provide useful information for energy applications. 

How to cite: Tang, C., Mialhe, P., Pohl, B., Morel, B., Koseki, S., Abiodun, B., and Bessafi, M.: Variability of the Surface Solar Radiation over Reunion island and its interaction with the synoptic, intraseasonal and interannual convective variability, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-6831, https://doi.org/10.5194/egusphere-egu22-6831, 2022.