Effects of Noise and Absorption on High Frequency Measurements of Acoustic-Backscatter from Fish

Figure 2

Absorption coefficient by Francois and Garrison’s equations [17, 18] as a function of frequency with parameter of water temperature for constant values of the salinity 35 psu, depth 100 m, sound speed 1500 m/s, and pH 8. Note the inversion of temperature dependence around 70 and 500 kHz.