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Sigma-t is a quantity used in oceanography to measure the density of seawater at a given temperature. σT is defined as ρ(S,T)-1000 kg m, where ρ(S,T) is the density of a sample of seawater at temperature T and salinity S, measured in kg m, at standard atmospheric pressure. For example, a water sample with a density of 1.027 g/cm has a σT value of 27.
References
- "Parameter: SigmaT | CTD Profiles | Biological and Chemical Oceanography Data Management Office". www.bco-dmo.org. Retrieved 2022-10-13.