Some anomalies in the shape of Lidar signal from upper sea-water layers

Yurij I. Kopilevich; Alexander A. Svetlykh; Victor I. Feigels

doi:10.1117/12.177315

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3 June 1994 Interpretation of some anomalies in the shape of lidar signals from upper sea-water layers

Yurij I. Kopilevich, Alexander A. Svetlykh, Victor I. Feigels

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Proceedings Volume 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements; (1994) https://doi.org/10.1117/12.177315
Event: SPIE's International Symposium on Optical Sensing for Environmental Monitoring, 1993, Atlanta, GA, United States

Abstract

In a series of laser sounding experiments the registered shapes of retroreflected light pulses demonstrate an anomalously high levels of signals from isolated seawater layers. We propose here an interpretation for such peculiarities of echo-signal shape with the use of developed theory of backscattered light pulse kinetics in turbid medium. Our approach is based on the accounting of the angular anisotropy of the scattering in the back hemisphere and the geometrical conditions of typical lidar experiment, which determine the small angle divergence of collected light beam from the retro-reflection direction. According to the analysis presented below, the enhanced backscattering from isolated depth levels may be caused by high concentration of large biological particles (alga cells - coccolitophorids, diatoms, etc.) in the corresponding water layers. The explanation is shown to be consistent with the known unique measurements of volume scattering phase function in the vicinity of backward direction.

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Yurij I. Kopilevich, Alexander A. Svetlykh, and Victor I. Feigels "Interpretation of some anomalies in the shape of lidar signals from upper sea-water layers", Proc. SPIE 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements, (3 June 1994); https://doi.org/10.1117/12.177315

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