Podlejski W. auteur aut IRD Nerini D. auteur aut IRD Doglioli A. auteur aut IRD Lett Christophe auteur aut IRD text journalArticle eng text/pdf born digital access Massive Sargassum stranding events affect erratically numerous countries from the Gulf of Guinea to the Gulf of Mexico. Forecasting transport and stranding of Sargassum aggregates require progress in detection and drift modelling. Here we evaluate the role of currents and wind, i.e. windage, on Sargassum drift. Sargassum drift is computed from automatic tracking using MODIS 1 km Sargassum detection dataset, and compared to reference surface current and wind estimates from collocated drifters and altimetric products. First, we confirm the strong total wind effect of approximate to 3 % (approximate to 2 % of pure windage), but also show the existence of a deflection angle of approximate to 10 degrees between Sargassum drift and wind directions. Second, our results suggest reducing the role of currents on drift to 80 % of its velocity, likely because of Sargassum resistance to flow. These results should significantly improve our understanding of the drivers of Sargassum dynamics and the forecast of stranding events. specialized Sargassum algae Computer vision Regression Tracking Remote sensing Drift Collocation Drifter Tropical North Atlantic Time series ATLANTIQUE NORD ZONE TROPICALE 034 038 020 126 188 114629 [9 p.] 2023 0025-326X https://www.documentation.ird.fr/hor/fdi:010087480 10.1016/j.marpolbul.2023.114629 0025-326X [F B010087480] https://www.documentation.ird.fr/hor/fdi:010087480 https://www.documentation.ird.fr/intranet/publi/2023-04/010087480.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2023-04-14 2025-02-24 fdi:010087480 fre