The sea surface salinity (SSS) optimum interpolation (OI) product combines observations from NASA's Aquarius/SAC-D and Soil Moisture Active-Passive (SMAP) satellite missions into a continuous and consistent multi-satellite SSS data record.
Thanks to this long, continuous data record, it is possible to compute monthly climatology data. Climatology data are computed over more than a decade (view climatology maps). In addition, anomaly data are computed relative to the OI SSS product-based monthly climatology (view anomaly maps).
Click on the images (below) for a closer view. From there, you can click the left/right arrows to move from month to month. After you've selected a specific map, you can click on the caption to view anomaly data for that month/year.