Light attenuation and scattering sensors for the Kieler multimeeressonde with results from ocean expeditions

For the physical oceanographer in general, temperature T, salinity S, electrical conductivity L and pressure P are basic parameters. Density D, sound velocity V and others can be calculated from T, S and P. However, this is only possible to an accuracy which depends on further parameters which are neglected in the equations because the influence of them is unknown. The problem of the importance of further parameters is discussed and a light attenuation meter is described. Some results of measurements of the attenuation are demonstrated and interpreted.