Based on the analysis of long-term measurements by bio-argo floats, characteristic features are described and quantitative characteristics of the distribution of the light backscattering coefficient by suspended particles in the upper 1000-meter layer of the Black Sea are obtained.
The purpose of the work was to build a regional algorithm for reconstructing the vertical diffuse attenuation coefficient at 380, 443, 490, 510, 555, 590 and 620 nm for Lake Baikal based on quasi-synchronous in situ measurements and the standard ocean color Level-2 OLCI product. For the first time, the spatial distribution of the diffuse attenuation coefficient was obtained at seven wavelengths in the upper layer of Lake Baikal.
Based on the analysis of the Bio-Argo floats measurements for the backscattering coefficients by particles at 532 nm and 700 nm in the Black Sea waters and a regional ocean color product with the involvement of a physical model, the measurements of these parameters were corrected, the slope of the backscattering coefficients by particles was calculated, and its time function in the photic layer of the Black Sea was plotted.
In this study, a regional algorithm for retrieving Inherent Optical Properties (IOPs) has been developed for the Black Sea using remote sensing reflectance at five wavelengths in the visible spectral range corresponding to the Sea-viewing Wide Field of View Sensor (SeaWiFS). The model retrieves a spectral signature of particle backscattering coefficient at 555 nm, bbp(λ), and its spectral slope, np, total absorption coefficient of colored detrital matter (sum of colored dissolved matter and non-algal particles, CDM) at 490 nm, aCDM(λ), spectral slope of CDM absorption coefficient, S, and chlorophyll a concentration, Ca. These satellite derived set of IOPs and bio-optical properties measured in situ in the western open Black Sea within period 1998-1999 have been analyzed. The result reveals four specific cases corresponding to 1) variation of spectral slope of CDM absorption coefficient, 2) coccolithophores blooms, 3) domination of micro-celled phytoplankton (diatoms and/or dinoflagellates) and 4) presences of the picoplankton in phytoplankton community. Examples of the spatial distribution and seasonal variability of the retrieved parameters in half-monthly composite maps are presented. A complete set of these maps for SeaWiFS lifetime is available on http://blackseacolor.com/.
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