54 research outputs found
Phytoplankton fluxes and biomass in the White Sea in 2007 and 2008
Vertical fluxes of phytoplankton (VF_phyto) and particulate organic carbon (VF_POC) in the White Sea were determined using seven long-term (292 to 296 days) sediment traps moored at five stations at depths 67 to 255 m. Annual VF_phyto and VF_POC ranged from 0.55 to 24.64 g C/m**2 and from 3.7 to 93.9 g C/m**2, respectively. The highest VF_phyto was observed in the Basin region located close to the Gorlo along the Tersk coast. Algal biomass accounted for 15-43% of VF_pOC. Diatoms comprised the most important group accounting for 83-100% in sinking biomass. Thalassiosira nordenskioeldii dominated in VF_phyto at all trap stations except for one in the Basin close to the Onega Bay, where Ditylum brightwellii was the most abundant
(Table 2a) Heavy mineral composition of 0.1-0.05 mm size fraction from bottom sediments of the Kem' River estuary
(Table 4) Minor element contents in <1 mm size fraction from surface layer bottom sediments of the Kem' River estuary
Aerosols over the East Atlantic in spring and summer 2001
Data on the concentration and mineral composition of aerosols collected by nets in Cruise 18 of R/V Akadernik Fedorov on a submeridional section in the East Atlantic are presented. An empirical curve for calculating efficiency factor of a net is given for different concentrations of mineral part of aerosols. Fluxes of lithogenic part of aerosols to the sea surface are calculated. A comparison of lithogenic fluxes from the atmosphere and in the water column of the ocean showed that values of fluxes practically coincide in areas with dominating supply of dry atmospheric material. These fluxes strongly differ in the intratropical convergence zone, where deposition of aerosols depends on atmospheric precipitation, or in regions, where sedimentary material is supplied to the ocean mainly by river run-off. Residence time of aerosol lithogenic matter in the euphotic layer is calculated
(Table 2b) Light mineral composition of 0.1-0.05 mm size fraction from bottom sediments of the Kem' River estuary
Composition of surface layer bottom sediments from the Kem' River estuary, White Sea
Based on grain-size, mineralogical and chemical analyses of samples collected in cruises of R/V Ekolog (Institute of Northern Water Problems, Karelian Research Centre of RAS, Petrozavodsk) in 2001 and 2003 regularities of chemical element distribution in surface layer bottom sediments of the Kem' River Estuary in the White Sea were studied. For some toxic elements labile and refractory forms were determined. Correlation analysis was carried out and ratios Me/Al were calculated as proxies of terrigenous contribution. Distribution of such elements as Fe, Mn, Zn, Cr, Ti was revealed to be influenced by natural factors, mainly by grain size composition of bottom sediments. These metals have a tendency for accumulation in fine-grained sediments with elevated organic carbon contents. Distribution of Ni is different from one of Fe, Mn, Zn, Cr, Ti. An assumption was made that these distinctions were caused by anthropogenic influence
(Table 2) Algae dominant species in vertical flux of phytoplankton, their fluxes and percentages in total vertical flux of phytoplankton in the White Sea
(Table 6) Sorbed and total contents of some minor elements in <1 mm size fraction from surface layer bottom sediments of the Kem' River estuary
(Table 3) Total biomass of phytoplankton, biomass of diatoms in plankton, and contribution of the most abundant species to the total biomass of phytoplankton at trap stations in the White Sea in August-September 2007 and in June 2008
(Table 3) Major element contents in <1 mm size fraction from surface layer bottom sediments of the Kem' River estuary
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