Retrieving Ocean Surface Currents from the Sentinel-1 Doppler Shift Observations: A Case Study of the Norwegian Coastal Current

Satellite-based Synthetic Aperture Radar (SAR) observations can provide global estimates of ocean surface motion. We used Doppler Centroid anomaly from Sentinel-1 Interferometric Wide (IW) mode observations collocated with Lagrangian ocean surface drifter (CARTHE) and high-resohution free-run ocean model (ROMS) to study Norwegian Coastal Current. The ocean surface current derived from the Sentine-1 is in good agreement with the ocean surface drifter observations as well as the ocean surface velocity derived from ROMS. Although just one case is investigated, the study shows promising results of using Doppler shift observations from the Sentinel-1 Interferometric Wide (IW) mode for studying ocean surface currents in the coastal zone with high-spatial resolution.