Specific-volume anomaly

From Glossary of Meteorology

specific-volume anomaly

(Or anomaly of specific volume;
also called steric anomaly; symbol δ.) In oceanography, the excess of the actual specific volume of the seawater at any point in the ocean over the specific volume of seawater of salinity 35 psu and temperature 0°C at the same pressure.

The integral of specific-volume anomaly with depth is the dynamic-height anomaly.
See thermosteric anomaly.