A Newly Observed Quasi-stationary Subsurface Anticyclone of the North Brazil Undercurrent at 4°S: The Potiguar Eddy - Krelling, Ana Paula M.; Silveira, Ilson Carlos Almeida da; Polito, Paulo Simionatto; Gangopadhyay, Avijit; Martins, Renato P.; Lima, José Antônio M.; Marin, Fernando de O. (Journal of Geophysical Research Oceans, 2020)