ИССЛЕДОВАНИЕ БИООПТИЧЕСКИХ ХАРАКТЕРИСТИК ВОД ПОВЕРХНОСТНОГО СЛОЯ БАРЕНЦЕВА И НОРВЕЖСКОГО МОРЕЙ ЛЕТОМ 2017 ГОДА

Abstract

A study of the surface layer bio-optical properties of the Barents and Norwegian Seas in the summer of 2017 is carried out. Ship data were obtained during the 68th cruise of the R/V ‘Akademik Mstislav Keldysh’ (June-August 2017). Using a flow-through system, the fluorescence intensities of chlorophyll ‘a’ and dissolved organic matter as well as the salinity and temperature of the water surface layer along the ship’s route were continuously recorded. Seawater samples were taken for spectral fluorescence and absorbance measurements performed with a laser spectrometer and an integrating cavity absorption meter. The results are compared with the data of direct determinations of the chlorophyll concentration. Frequent continuous cloudiness prevented the use of ocean color data for the Norwegian Sea. In the coccolithophore bloom area in the Barents Sea, the results of shipboard measurements are compared with the data of OLCI satellite scanner. In this area, standard OLCI algorithms overestimate chlorophyll concentration, while the regression algorithm works better than based on neural networks. Comparison of the fluorescence and absorption spectra has shown the possibility of carrying out a rapid assessment of the chlorophyll concentration using optical methods. The change in the coefficients of the regression equations of chlorophyll fluorescence intensity and its concentration, determined by direct methods for different regions, is shown.