The ocean can be seen as the
earth’s huge water-storage tank, accounting for 97% of the
earth’s water (rivers, lakes, atmosphere, glaciers, and oceans combined).
Because the ocean plays
an extremely important role in global water circulation, it is necessary to
know how much water evaporates from the ocean and how much freshwater flows
To capture the state of evaporation and the inflow of
freshwater, it is necessary to
accurately know the spatiotemporal distribution of the salinity
concentration (hereinafter abbreviated as “salinity”), which is an index of the mixing ratio of freshwater
and salt water.