Need help with calculating the densities of water please!!!
Seawater density is often reported in σ. Densities reported this way show the deviation from pure water in kg/m3. Therefore a seawater density of 25 σ indicates an actual density of 1025 kg/m3. This is done so the important density changes are easier to visualise.
The general form of the density equation is
σ = a +bT + cS +dT2 +eST + fS2 + gT3 + hST2 + iS2T + jS3
Where σ is the density, S is salinity (in psu) and T is temperature (in °C).
The polynomial coefficients ‘a to j’ are given below as calculated by Cox et al. (1970).
a = 8.00969062 x 10-2
b = 5.88194023 x 10-2
c = 7.97018644 x 10-1
d = -8.11465413 x 10-3
e = -3.25310441 x 10-3
f = 1.31710842 x 10-4
g = 4.76600414 x 10-5
h = 3.89187483 x 10-5
i = 2.87971530 x 10-6
j = -6.11831499 x 10-8
|Location||Water Temperature (°C)||Water Salinity (psu)|
|North Atlantic Drift||17.83||35.27|
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