Glukhov V.A., Goldin Yu.A., Rodionov M.A.
A method for processing a shipborne radiometric polarization lidar signals has been developed. The method allows to perform reliable and fairly accurate determination the position of the boundary between layers with different hydrooptical characteristics. The method is based on the analysis of the time dependence of the echo signal decay. This makes it possible to register changes of the boundary position in the absence of a high scattering layer. Model calculations of lidar echo signals for two-layer stratification of hydrooptical characteristics has showed sharp changes in the time dependence of the echo signal decay in the region of the boundary between the layers, which is especially pronounced for the cross-polarized component of the echo signal. A long-term cycle of lidar sounding of the seawater was performed. The accompanying measurements of the hydrophysical characteristics and the light attenuation coefficient by the Seabird SBE25 with a transmissometer in the experimental area showed the presence of a boundary between the layers at depths of 15—17 m, confined to the pycnocline depth. Processing and analysis of the resulting array of lidar sounding data made it possible to record periodic changes in the position of the boundary between the layers. The maximum recorded amplitude is 3 m, and the average oscillation time period is 8.5 min. The obtained values are typical for internal waves observed in the shelf zone of the Black Sea.
