Flavien Gouillon (CNES, France); Eric Chassignet (FSU/COAPS, USA)

Modeling ocean circulation is a fundamental step in understanding physical processes and interactions between spatial and temporal scales. However, accurately modeling different processes remains a real challenge. The validation of ocean models is therefore crucial for ensuring the accuracy of ocean simulations, particularly in regions with complex dynamics like the Gulf Stream. Altimetry data from space missions, notably SWOT (Surface Water and Ocean Topography), provide an invaluable opportunity for model validation due to their high spatial resolution and global coverage. This study compares models output circulations with SWOT measurements in the Gulf Stream region, focusing on sea surface height, current velocities, and circulation patterns. The goal is to quantify discrepancies between model outputs and observations, and to assess how differences in model resolution and ocean process representation affect simulations of the Gulf Stream. Preliminary results suggest that SWOT data offers precise validation for this region, highlighting its potential for improving oceanographic predictions and enhancing our understanding of Gulf Stream dynamics.