Salinity is a measure of the concentration of dissolved salts in seawater. Salinity is defined as the ratio of the mass of dissolved material in sea water to the mass of sea water (UNESCO, 1985; TEOS-10, 2010). The term 'Absolute Salinity' (SA), measured as g/kg (mass fraction of salt in seawater) has been adopted as the standard SI unit for salinty, for use in calculations of the thermodynamic properties of seawater, by the International Oceanographic Commission (see TEOS-10, 2010). The term 'Practical Salinity (SP) , based on conductivity, is being phased out.
Unfortunately, salinity has been reported in numerous ways in the past, for example, as parts per thousand (ppt or ‰), as the 'practical salinity unit' (psu) or as 'salinity' without any units. Therefore, for the sake of accuracy when referring to salinity in our on-line reviews, the units used by the original authors are quoted in the text.
|Salinity levels (adapted from Hiscock, 1996)|
|Low salinity||< 18|