Animation of the Multi-Mission Optimally Interpolated Sea Surface Salinity (OISSS) monthly level 4 global dataset based on the AQUARIUS/SAC-D, SMAP and SMOS level 2 mission data gridded on a 0.25 degree spatial grid with a monthly time scale. The dataset covers the period from September 2011 to the August 2021, and is produced at the International Pacific Research Center (IPRC) of the University of Hawaii at Manoa in collaboration with the Remote Sensing Systems (RSS), Santa Rosa, California. (https://doi.org/10.5067/SMP10-4UMCS).