c(D,S,T) = ^{ } |
1448.96 + 4.591T - 5.304 x 10^{-2}T^{2} +
2.374 x 10^{-4}T^{3} + 1.340 (S-35) + 1.630 x 10^{-2}D
+ 1.675 x 10^{-7}D^{2} - 1.025 x 10^{-2}T(S -
35) - 7.139 x 10^{-13}TD^{3} |

T = temperature in degrees Celsius S = salinity in parts per thousand D = depth in metres |

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*Range of validity: temperature 2 to
30 C, salinity 25 to 40 parts per thousand, depth 0 to 8000 m*

The above equation for the speed of sound in sea-water as a function of temperature, salinity and depth is given by Mackenzie equation (1981).

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Reference

K.V. Mackenzie, Nine-term equation for the sound speed in the oceans (1981) J. Acoust. Soc. Am. 70(3), pp 807-812