Abstract Bio-Argo measurements of the backscattering coefficient (bbp) were used to investigate t... more Abstract Bio-Argo measurements of the backscattering coefficient (bbp) were used to investigate the time-depth evolution of coccolithophore blooms in the Black Sea. Five years of Bio-Argo data obtained in 2014–2018 revealed two distinct peaks of bbp corresponding to the winter and early summer coccolithophore blooms. The latter started in the upper mixed layer (UML) in April–May and was characterized by the highest coccolithophore concentrations. During the most extensive summer bloom in 2017, its estimates reach 10 × 106 cells l−1. The summer blooms occupied the UML (0–10 m) and a seasonal thermocline (10–30 m). The lower boundary of the bloom was related to the position of isopycnal 1014 kg m−3, which deepens in May–July due to summer heating. Consequently, the coccolithophore bloom deepened to 20–30 m and terminated rapidly in July. Bloom termination was accompanied by a significant rise in light attenuation (kd) in the sea basin. This peak was attributed to the release of dissolved organic carbon (DOC), which was possibly related to viral lysis and the exudation of lipids from coccolithophore cells. Data on the kd was used to estimate the seasonal variability in DOC in the Black Sea. Maximal estimated values of DOC were observed at 15–35 m depth in June-August and coincided with the early summer coccolithophore bloom termination. The winter coccolithophore bloom started in October–November in the UML. The maximum bbp was observed in January. High values of bbp were observed down to a depth of 60 m during the maximal deepening of the mixed layer. The winter blooms were distinctly observed in MODIS satellite images, where they were characterized by high reflectance and relatively low chlorophyll concentrations. The estimated coccolithophore concentration in winter was lower than that in summer, but column-averaged bbp values were comparable. The winter coccolithophore bloom reached a peak within one month after the autumn peak of chlorophyll A, indicating the possible importance of the nutrients recycled after the diatom autumn bloom. In contrast to summer, the maximum DOC observed at the surface preceded the winter coccolithophore bloom, and the mass DOC production was probably attributed to the excretion and lysis of the non-calcified phytoplankton cells.
The mechanisms of formation and distribution of total suspended matter (tsm) off the West Coast o... more The mechanisms of formation and distribution of total suspended matter (tsm) off the West Coast of Crimea under the influence of strong winds of various directions were investigated on the base of satellite data of medium and high resolution. The maximum tsm reaching the values of 200 mg / l was is observed during strong southern winds. In this case, the zone of high tsm is located at the western shelf of the Crimea limited by a 50 m isobath. The wave impact on resuspension of bottom sediments and the erosion of clay cliffs located on the west coast of Crimea lead to the formation of a large amount of tsm. After the storm, a northern alongshore current transfers tsm to the north. During northeast winds, the highest tsm are observed not near the coast, but in the seaward part of the shelf between 30 and 50 m isobaths. It is likely that turbulent mixing during such winds resuspense bottom sediments in shallow areas, which are further transported from the coast due to the offshore wind...
In the surface water of the Black Sea a strong thermal stratification, which controls processes o... more In the surface water of the Black Sea a strong thermal stratification, which controls processes of vertical exchange develops during summer months. Coastal wind driven upwelling phenomena play a significant role for the biogeochemistry of the marine ecosystem of the Black Sea. The temperature difference between upwelling areas and the surrounding water can be as high as 12 C and
In situ data compiled during Cruise 52 of the R/VMikhail Lomonosov in May 1990 have been used to ... more In situ data compiled during Cruise 52 of the R/VMikhail Lomonosov in May 1990 have been used to study the space-time variability of the near-surface temperature, with weak wind blowing. Temperature fluctuations within the layer of diurnal warming are shown to be primarily controlled by the heterogeneity of the wind-induced mixing and to be capable of indicating internal waves. The
... Phys. Oceanogr. (1997) 8, 243-251 4. Androsovich, AI, Milthailova, EN and Shapiro, NB Numeric... more ... Phys. Oceanogr. (1997) 8, 243-251 4. Androsovich, AI, Milthailova, EN and Shapiro, NB Numerical model and calculation of the water circulation in the north-western Black Sea. Phys. ... In: Diagnosis of the State of Marine Environment in the Sea of Azov-Black Sea Basin. ...
The Aral Sea disaster is one of the most significant examples of ecological catastrophe caused by... more The Aral Sea disaster is one of the most significant examples of ecological catastrophe caused by mismanagement of water resources. Aral sea level dropped on 22 meters for the last 35 years. The sea separated in to two independent parts , the Large Sea(Southern) and the Small Sea (Northern), loosing more than 90% of its original water masses. After the
Abstract Bio-Argo measurements of the backscattering coefficient (bbp) were used to investigate t... more Abstract Bio-Argo measurements of the backscattering coefficient (bbp) were used to investigate the time-depth evolution of coccolithophore blooms in the Black Sea. Five years of Bio-Argo data obtained in 2014–2018 revealed two distinct peaks of bbp corresponding to the winter and early summer coccolithophore blooms. The latter started in the upper mixed layer (UML) in April–May and was characterized by the highest coccolithophore concentrations. During the most extensive summer bloom in 2017, its estimates reach 10 × 106 cells l−1. The summer blooms occupied the UML (0–10 m) and a seasonal thermocline (10–30 m). The lower boundary of the bloom was related to the position of isopycnal 1014 kg m−3, which deepens in May–July due to summer heating. Consequently, the coccolithophore bloom deepened to 20–30 m and terminated rapidly in July. Bloom termination was accompanied by a significant rise in light attenuation (kd) in the sea basin. This peak was attributed to the release of dissolved organic carbon (DOC), which was possibly related to viral lysis and the exudation of lipids from coccolithophore cells. Data on the kd was used to estimate the seasonal variability in DOC in the Black Sea. Maximal estimated values of DOC were observed at 15–35 m depth in June-August and coincided with the early summer coccolithophore bloom termination. The winter coccolithophore bloom started in October–November in the UML. The maximum bbp was observed in January. High values of bbp were observed down to a depth of 60 m during the maximal deepening of the mixed layer. The winter blooms were distinctly observed in MODIS satellite images, where they were characterized by high reflectance and relatively low chlorophyll concentrations. The estimated coccolithophore concentration in winter was lower than that in summer, but column-averaged bbp values were comparable. The winter coccolithophore bloom reached a peak within one month after the autumn peak of chlorophyll A, indicating the possible importance of the nutrients recycled after the diatom autumn bloom. In contrast to summer, the maximum DOC observed at the surface preceded the winter coccolithophore bloom, and the mass DOC production was probably attributed to the excretion and lysis of the non-calcified phytoplankton cells.
The mechanisms of formation and distribution of total suspended matter (tsm) off the West Coast o... more The mechanisms of formation and distribution of total suspended matter (tsm) off the West Coast of Crimea under the influence of strong winds of various directions were investigated on the base of satellite data of medium and high resolution. The maximum tsm reaching the values of 200 mg / l was is observed during strong southern winds. In this case, the zone of high tsm is located at the western shelf of the Crimea limited by a 50 m isobath. The wave impact on resuspension of bottom sediments and the erosion of clay cliffs located on the west coast of Crimea lead to the formation of a large amount of tsm. After the storm, a northern alongshore current transfers tsm to the north. During northeast winds, the highest tsm are observed not near the coast, but in the seaward part of the shelf between 30 and 50 m isobaths. It is likely that turbulent mixing during such winds resuspense bottom sediments in shallow areas, which are further transported from the coast due to the offshore wind...
In the surface water of the Black Sea a strong thermal stratification, which controls processes o... more In the surface water of the Black Sea a strong thermal stratification, which controls processes of vertical exchange develops during summer months. Coastal wind driven upwelling phenomena play a significant role for the biogeochemistry of the marine ecosystem of the Black Sea. The temperature difference between upwelling areas and the surrounding water can be as high as 12 C and
In situ data compiled during Cruise 52 of the R/VMikhail Lomonosov in May 1990 have been used to ... more In situ data compiled during Cruise 52 of the R/VMikhail Lomonosov in May 1990 have been used to study the space-time variability of the near-surface temperature, with weak wind blowing. Temperature fluctuations within the layer of diurnal warming are shown to be primarily controlled by the heterogeneity of the wind-induced mixing and to be capable of indicating internal waves. The
... Phys. Oceanogr. (1997) 8, 243-251 4. Androsovich, AI, Milthailova, EN and Shapiro, NB Numeric... more ... Phys. Oceanogr. (1997) 8, 243-251 4. Androsovich, AI, Milthailova, EN and Shapiro, NB Numerical model and calculation of the water circulation in the north-western Black Sea. Phys. ... In: Diagnosis of the State of Marine Environment in the Sea of Azov-Black Sea Basin. ...
The Aral Sea disaster is one of the most significant examples of ecological catastrophe caused by... more The Aral Sea disaster is one of the most significant examples of ecological catastrophe caused by mismanagement of water resources. Aral sea level dropped on 22 meters for the last 35 years. The sea separated in to two independent parts , the Large Sea(Southern) and the Small Sea (Northern), loosing more than 90% of its original water masses. After the
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