The ocean environment parameter of the Gulf of Mexico with the presence of a strong eddy. (a) Surface velocity field and sea level anomaly (SLA) on September 26, 2014. The solid lines indicate the eddy boundaries. The color scale indicates the SLA in m. (b) SLA of the region is shown and magnified. The green cross indicates the horizontal location of eddy center. (c) Sound speed displacement contour along the red line in fig. 2(b). The contour line indicates the sound speed in m/s. The green cross indicates the vertical location of eddy center. (d) Sound speed profiles (SSPs) at different ranges from the source.