Improvements to SAR models
Dr. Øyvind Breivik from the Norwegian Meteorological Institute presents significant improvements to SAR models, focusing on enhanced wind and current resolution. The model now offers a 4 km resolution near rugged coastlines, fjords, bays, and estuaries, allowing for better topographic effect resolution. Currents are also modeled at a 1 km resolution. The study addresses errors and uncertainties in wind and current predictions, utilizing ensemble winds from ECMWF 51 and exploring alternative strategies, such as higher-resolution simulations. Collaborative efforts aim to refine leeway categories for better accuracy.
Improvements to SAR models
E N D
Presentation Transcript
Improvements to SAR models Dr Øyvind Breivik Norwegian Meteorological Institute
Improved wind and currents • Winds • Higher resolution – 4 km near rugged coastlines and in fjords, bays and estuaries to resolve topographic effects • Currents • Higher resolution – 1 km for fjords, bays and estuaries • HF currents and the STPS
Errors and uncertainties • Errors and uncertainties • Assessing the relative importance of uncertainties in wind, currents and drift properties • Ensemble winds (ECMWF 51) • Random flight – autocorrelated wind and current perturbations
Alternative strategies • Currents switched off for very high resolution simulations? • Inverse leeway for backtracking from debris
Improved taxonomy • Redo older leeway categories with new field methods • Refine the taxonomy for different parts of the world – in close collaboration with RCCs
