Figure 2. Time series of salinity (top) versus pressure (a) and density (b), and salinity anomaly (bottom) versus pressure (c) and density (d). Salinity anomalies are relative to the HOT mean and mean annual cycle. Tick marks along the time axes indicate the timing of individual HOT cruises. The scale along the right axis of the density coordinate plots (b, d) indicates the mean pressure in dbar (approximate depth, m) of the corresponding potential density level. The heavy line at the top of the density coordinate plot indicates the sea surface density.
