Since there is no major source of new salt in the ocean, halosteric contributions will result from redistribution of salt by currents, a change in evaporation over precipitation and runoff or from a change in salt concentration by a net change in the water stored in ice sheets.
Source: wiktionary
Antonov et al. (2002) attributed about 10% of the global average steric sea level rise during recent decades to halosteric expansion (i.e., the volume increase caused by freshening of the water column).
Source: wiktionary
Thermosteric and halosteric changes may be partly due to changes in the inflowing Atlantic water and also due to changes in surface heat fluxes within the Mediterranean basin.
Source: wiktionary