Relationship between the Beam Attenuation Coefficient and the Concentration of Suspended Matter in Black-Sea Waters

By using the results of simultaneous measurements of the beam attenuation coefficient and the concentration of suspended matter in water samples, we deduce the relationships between these parameters for wavelengths of 640, 660, and 677 nm. The proposed formulas are used for the evaluation of the concentration of suspended matter according to the data of optical measurements performed in cruises of research vessels. We present two maps of the distribution of suspended matter plotted for the north part of the sea in November–December 1991 and for the south part of the sea in July 1992.     

Specific Features of the Vertical Distribution of the Beam Attenuation Coefficient in the Short- and Long-Wave Spectral Bands in Deep-Water Layers of the Hydrogen-Sulfide Zone and in the Bottom Layer of the Black Sea

On the basis of the data of sounding performed in the deep-water part of the sea down to 1920 m (for a depth of the sea of 2000 m), we study specific features of the vertical distribution of the beam attenuation coefficient in the violet (418 nm) and red (659 nm) spectral bands through the entire thickness of the hydrogen-sulfide zone including the bottom hydrologically homogeneous layer of water. The data of optical measurements performed in the bottom layer for the first time demonstrate that this layer is also optically uniform.     

Hydrooptical Characteristics of Subsatellite Test Ranges in the Mediterranean and Black Seas According to the Data of Investigations Performed by the R/V Gorizont in 1998

Hydrooptical investigations were performed for three subsatellite test ranges located near the Rhodes Island in the Levant Sea, near Dardanelles in the north part of the Aegean Sea, and near the Crimean Peninsula in the northwest part of the Black Sea. In the course of observations, we measured the beam attenuation coefficient, the depth of visibility of the Secchi disk, and the color of water. These data are used to characterize the space and time variability of the optical properties of water in the investigated regions.     

Characteristics of Underwater Irradiation in the Black Sea in Spring (1993 and 1995)

We present the data on the values of the coefficients of vertical attenuation and diffusive reflection of light in the Black Sea in spring 1993 and 1995, compute the depths of one-percent quantum irradiation and the parameter Μ specifying the fraction of attenuation of directed light as a result of scattering: Μ = σ/ɛ, and compare the characteristics of underwater irradiation in the sea in different seasons for 1989–1995. __________ Translated from Morskoi Gidrofizicheskii Zhurnal, No. 3, pp. 44–48, May–June, 2005.