Abstract
A strong and extensive sound scattering layer has been observed in the North Sea, at the depth of the summer thermocline. The behaviour of the scatterers in daylight and at night is discussed. Calculations show that the echo is not directly due to the physical discontinuity, confirming the usual biological theory for its origin. There is a probable identification of traces due to both plankton animals and fish. The scattering layer also acts as a marker for the thermocline, making possible some continuous measurements of thermocline depth.
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