During the international SPASIBA expedition (August - September 1991) optical measurements in Laptev Sea were made at few sections from Lena River delta to open sea (42 stations). Mainly vertical profiles of beam attenuation coefficient C(z) were measured using beam transmissometer. Statistical analysis showed that beam attenuation coefficient closely correlated with suspended matter concentration (r equals 0.96). So results of optical measurements can be interpreted in terms of suspended matter concentration.
Vladimir I. Burenkov,
"Optical properties of the Laptev Sea near the Lena River delta", Proc. SPIE 2048, Underwater Light Measurements, (10 December 1993); doi: 10.1117/12.165504; https://doi.org/10.1117/12.165504