Fig. 1

a Trajectory of Seaglider for Feb. 27–Jun. 21 (gray line). Red line indicates focused period from Apr. 28–May 13. Background color and contours display mean sea level height anomaly (SSHA; cm) and absolute dynamic topography (ADT; cm), respectively, on May 1 based on the 0.25° × 0.25° daily mean merged gridded SSHA and ADT data set. b Vertically averaged horizontal current velocity (cm s−1; red arrow plotted every third profile)