Impacts of Solar Radiation Management on seasonal variability of the Equatorial Atlantic Cold Tongue

This study aims to investigate the seasonal impact of Solar Radiation Management (SRM) on the equatorial Atlantic Cold Tongue (EACT). To examine this impact we used the control (CTRL) simulation (RCP8.5 scenario) and Feedback (FDBK) simulation (RCP8.5 scenario+SRM) of the Geoengineering Large Ensemble (GLENS) model. Firstly, Historical simulation of model is validated with observations. The model shows its ability to reproduce the observations. Secondly, the impact of SRM is evaluated using CTRL and FDBK simulations over the period 2050-2069. Results indicated that SRM reduce (around 2°C) the seasonal cycle of the Sea Surface Temperature (SST) in the EACT region. Preliminary analysis show that the causes of SST dimunition is not due to thermodynamic processes. Other processes that may explain this decrease in SST are under investigations.

Keywords: SST, Cold Tongue, SRM, Seasonal Cycle