Figure 2: (a) Map showing sea level trends (mm/yr) calculated at each T/P crossover point over the period 1993-2000. Before the trend calculation, mean seasonal variations were eliminated from the monthly time series at each data point and then low-pass filtered using a Gaussian filter with a cut-off at six months. (b) Mean sea level variations (mm) averaged for the whole Southern Ocean south of 40°S (green) and for the entire global ocean (red). Area-dependent weights were applied during the averaging process.