Sigma-t is a quantity used in oceanography to measure the density of seawater at a given temperature. [1] σ T is defined as ρ(S,T)-1000 kg m −3, where ρ(S,T) is the density of a sample of seawater at temperature T and salinity S, measured in …

Sigma-t density, often reported in kg/m^3 - 1000. 'Sigma-t' is density minus 1000 (without the effect of pressure). It is normally calculated from observations of temperature and salinity. (See How do we measure the density of sea water?) Sigma-t density from primary sensor. Originally named 'Sigma-t00'. Sigma-t density from secondary sensor.

…a density unit called sigma-t (σ t). This value is obtained by subtracting 1.0 from the density and multiplying the remainder by 1,000. The σ t has no units and is an abbreviated density of seawater controlled by salinity and temperature only. The σ t of seawater increases with increasing salinity and… Read More

These two factors led oceanographers to adopt a density unit called sigma-t (σ t). This value is obtained by subtracting 1.0 from the density and multiplying the remainder by 1,000. The σ t has no units and is an abbreviated density of seawater controlled by salinity and temperature only.

2001年3月2日 · "Sigma-t" is simply density minus 1000 (without the effect of pressure). Since the variations in seawater "density" varies only in the last few significant figures, we subtract 1000 for convenience in order to carry less numbers around. Hence, typical sigma-t is 26.0.

2018年5月8日 · sigma-t density(σ-t density) The density of a sea-water sample measured at atmospheric pressure (i.e. at the sea surface). It is defined as density minus 1000, where the density is measured in kg/m 3. Sea water at 0°C and 35 parts per thousand salinity has a density of 1028 kg/m 3, or a σ-t density, at a pressure of 1 bar, of 28.

2024年3月30日 · (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.

1 天前 · The density of a sea-water sample measured at atmospheric pressure (i.e. at the sea surface). It is defined as density minus 1000, where the density is measured in kg/m3. Sea water at 0°C and 35 parts per thousand salinity has a density of 1028 kg/m3, or a σ-t density, at a pressure of 100 kPa, of 28.

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The SIGMA-T series of mathematics attainment tests has been specially developed and standardised for use in Irish primary schools. The five levels within the series are based on main strands of the Primary School Mathematics Curriculum and the content of the tests has been fully aligned with the mathematics programme.