Massive arrivals of holopelagic sargassum severely affect coastal ecosystems, tourism, and fisheries across the Caribbean, creating significant management challenges for small-island developing states. Effective responses require localized information on sargassum transport and accumulation at temporal scales relevant to operational decision-making. This study investigates the role of mesoscale eddies in modulating sargassum arrival along the southern coast of the Dominican Republic. A region of interest extending from the shoreline to 200 km offshore was analyzed using daily satellite-based sargassum detection imagery paired with 3-h current estimations from the HYCOM model. Sargassum rafts were manually tracked, classified as approaching or open-water, and compared against current magnitude, direction, and eddy presence across predefined zones. Results indicate recurrent associations between local eddies and the movement of sargassum rafts, including both accumulation offshore and facilitation of shoreward transport. In particular, Zones 1 and 2 exhibited consistently weak currents, suggesting conditions favorable to raft stagnation or localized eddy activity. While causality cannot be fully established, the findings highlight spatial patterns of increased susceptibility to sargassum landings and the influence of dynamic mesoscale processes. These insights can support more targeted monitoring strategies and inform early-warning efforts for coastal management.

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Eddies as Indicators of Local Sargassum Inundation Risks on the South Coast of Dominican Republic

  • Iván Jiménez-Durán,
  • Lodriz Lorenzo Rodríguez,
  • Miguel Aybar-Mejía,
  • Deyslen Mariano-Hernández,
  • Carlos Sanlley

摘要

Massive arrivals of holopelagic sargassum severely affect coastal ecosystems, tourism, and fisheries across the Caribbean, creating significant management challenges for small-island developing states. Effective responses require localized information on sargassum transport and accumulation at temporal scales relevant to operational decision-making. This study investigates the role of mesoscale eddies in modulating sargassum arrival along the southern coast of the Dominican Republic. A region of interest extending from the shoreline to 200 km offshore was analyzed using daily satellite-based sargassum detection imagery paired with 3-h current estimations from the HYCOM model. Sargassum rafts were manually tracked, classified as approaching or open-water, and compared against current magnitude, direction, and eddy presence across predefined zones. Results indicate recurrent associations between local eddies and the movement of sargassum rafts, including both accumulation offshore and facilitation of shoreward transport. In particular, Zones 1 and 2 exhibited consistently weak currents, suggesting conditions favorable to raft stagnation or localized eddy activity. While causality cannot be fully established, the findings highlight spatial patterns of increased susceptibility to sargassum landings and the influence of dynamic mesoscale processes. These insights can support more targeted monitoring strategies and inform early-warning efforts for coastal management.