At the edge of the Amazon River plume, stirring by the North Brazil Current (NBC) and its eddies creates sharp surface thermohaline gradients on horizontal scales of 𝒪 (1–100) km. This study provides a comprehensive picture of these gradients and fronts associated with the region's distinctive dynamics. Saildrone observations show that the plume amplifies density gradient variability at all scales from 1–100 km, with frontal s...

The municipality of Mangaratiba, located in the Sepetiba Bay region (Rio de Janeiro State; Southeast Brazil), has been taken over for several years by large structures, including real estate, tourism, industrial and ore export activities. Transportation and port activities, especially iron ore logistics from the Iron Quadrangle region (MG), have changed the landscape, particularly the beaches in the municipality of Mangaratiba...