(a) SSH distribution across the GS averaged between 75°W–70°W during two 5-year periods: 1993–1997 (black line) and 2007–2011 (red line). Also shown is the corresponding velocity during the same periods: 1993–1997 (blue line) and 2007–2011 (magenta line). (b) Similar to (a) but for the region 65°W–50°W. (c) Time series of the cross-front SSH difference, the maximum speed and width of the GS, and the SSH at the GS center (black line) and those at its southern (red line) and northern (green line) boundaries averaged in the region 75°W–70°W. Linear trend for each property is computed for two periods: 1993–2016 (red line) and 1993–2011 (green line). (d) Similar to (c) but for the region 65°W–50°W.