Sigma-t

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sigma-t

(Symbol σt.) 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,
ams2001glos-Se24
where p = 0 is the atmospheric pressure relative to that at the sea surface.

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