Sigma-t

sigma-t

(Symbol σ_t.) The density ρ (in kg m^-3) that seawater, of salinity S and temperature T, would have at sea level (i.e., at atmospheric pressure), less 1000 kg m^-3.

In symbols,

where p = 0 is the atmospheric pressure relative to that at the sea surface.

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(Also called barometric pressure.) The pressure exerted by the atmosphere as a consequence of gravitational attraction exerted upon the "column" of air lying directly above the point in question.