Occurrence forms of trace metals in recent bottom sediments from the White and Barents Seas     

D. F. Budko  L. L. Demina  A. P. Lisitzin  M. D. Kravchishina  N. V. Politova 《Doklady Earth Sciences》2017,474(1):552-556

For the first time based on determination of the geochemical occurrence forms of trace metals the main processes that control the accumulation of elements (Al, Mn, Fe, Mo, Cr, Ni, Co, Cu, Pb, Cd, and As) in the recent sediment cores from the White Sea and Barents Sea were quantified. A high-resolution study of the bottom sediment cores allowed us to estimate the short-term variations (periodicity of 10–15 years) in the accumulation of metals to reveal the periods of maximum Fe and Mn contents in the amorphous hydroxides fraction, which serve as effective adsorbents of the trace elements majority, including heavy metals. The Mn/Fe ratio in the amorphous hydroxides phase can be considered as geochemical indicators of early diagenesis.  相似文献   

Vertical Fluxes of Suspended Sedimentary Matter in Arctic Sedimentogenesis of Intracontinental Seas     

Novigatsky  A. N.  Lisitzin  A. P.  Klyuvitkin  A. A.  Shevchenko  V. P.  Kravchishina  M. D.  Politova  N. V. 《Doklady Earth Sciences》2018,479(1):384-389

Doklady Earth Sciences - Based on long-term studies of a small sea in the Arctic Ocean, new regularities in the sedimentary process under the conditions of Arctic sedimentogenesis were established....  相似文献   

Pelagic Ecosystem of the Nansen Basin under the Influence of Variable Atlantic Water Inflow: The Mechanism Forming Diatom Bloom in the Marginal Ice Zone     

Pautova  L. A.  Silkin  V. A.  Kravchishina  M. D.  Yakubenko  V. G.  Kudryavtseva  E. A.  Klyuvitkin  A. A.  Lobkovsky  L. I. 《Doklady Earth Sciences》2021,499(1):590-594

Doklady Earth Sciences - Unique data were obtained on the abnormally high level of phytoplankton biomass (30 g m–3) in the marginal ice zone of the deep-water High Arctic (the Nansen Basin,...  相似文献   

Early diagenesis in recent bottom sediments of the Dvina Bay (White Sea)     

N. V. Politova  A. A. Klyuvitkin  A. N. Novigatskii  N. V. Ul’yanova  A. L. Chul’tsova  M. D. Kravchishina  G. A. Pavlova  A. Yu. Lein 《Oceanology》2016,56(5):702-713

Investigations in the water column and bottom sediments including entrapped water were carried out on expeditions of the P.P. Shirshov Institute of Oceanology in the Dvina Bay, the White Sea. We studied the transformation of particulate organic matter at the biogeochemical barrier between the water and bottom and in the underlying Holocene sediments. Low rates of the early diagenesis of sediments caused by low values of primary production in the conditions of high fluxes of terrigenous organic matter were established. The low temperatures of microorganisms habitat play the secondary role.  相似文献   

An integrated study in the northern Caspian Sea: The 30th voyage of the R/V <Emphasis Type="Italic">Rift</Emphasis>     

V. N. Lukashin  A. K. Ambrosimov  N. V. Libina  M. D. Kravchishina  Yu. A. Goldin  N. V. Politova  Sh. Kh. Yakubov 《Oceanology》2010,50(3):439-443

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The distribution of the suspended matter concentration in the Kara Sea in September 2007 based on ship and satellite data     

V. I. Burenkov  Yu. A. Goldin  M. D. Kravchishina 《Oceanology》2010,50(5):798-805

The distribution of the suspended particulate matter concentration in the Kara Sea is analyzed based on ship and satellite data. The statistical relationships between the suspended matter concentration and the optical characteristics were revealed. Charts of the distribution of the suspended matter concentration in the Kara Sea were plotted, which confirmed that the application of optical methods for analyzing the spatial distribution of the suspended matter is effective. The most turbid waters were observed in the Ob Gulf, Yenisei Bay, the Baidaratskaya Gulf, and the adjacent regions. The smallest concentrations of suspended matter were observed in the central and western parts of the Kara Sea.  相似文献   

Hydrothermal Mineral Assemblages at 71° N of the Mid-Atlantic Ridge (First Results)     

Kravchishina  M. D.  Lein  A. Yu.  Boev  A. G.  Prokofiev  V. Yu.  Starodymova  D. P.  Dara  O. M.  Novigatsky  A. N.  Lisitzin  A. P. 《Oceanology》2019,59(6):941-959

Oceanology - The article discusses the preliminary results of plume and bottom sediment studies of the Trollveggen hydrothermal vent field based on data from cruise 68 of the R/V Akademik Mstislav...  相似文献   

In situ Measurements of the Characteristics of Suspended Particles in the Barents Sea by the LISST-Deep Laser Diffractometer     

Lokhov  A. S.  Kravchishina  M. D.  Klyuvitkin  A. A.  Kochenkova  A. I. 《Oceanology》2020,60(5):650-663

Oceanology - The key indicators of marine sediment genesis are the particle size distribution (PSD) and volume concentration of suspended particulate matter (SPM). However, their study is not...  相似文献   

Distribution and Feeding of Herbivorous Zooplankton in the Laptev Sea     

E. G. Arashkevich  A. V. Drits  A. F. Pasternak  M. V. Flint  A. B. Demidov  A. B. Amelina  M. D. Kravchishina  I. N. Sukhanova  S. A. Shchuka 《Oceanology》2018,58(3):381-395

Sampling was conducted along the quasi meridional transect at 130° E from the Lena River estuary to northern deep-sea regions of the Laptev Sea in September 2015. The latitudinal zonality and the impact of river runoff are manifested in the temperature and salinity distribution, concentration of particulate organic matter, and the structure of plankton communities. The differences in the chl a concentration and primary production along the transect are insignificant. The feeding rate of mesozooplankton herbivores was assessed by a fluorescence technique. The total consumption of phytoplankton biomass and primary production are estimated based on the feeding rate, abundance of zooplankton species, and their diel migrations. The daily grazing impact of zooplankton on phytoplankton biomass increases from 2% on the inner shelf to 3% on the mid-shelf, 5% on the outer shelf, and 10% in the deep-sea part of the basin. The consumption of primary production also increases: 1, 4.5, 5.7, and 13.9%, respectively. In the fall, the consumption of phytoplankton does not compensate the energy demands for respiration. The latitudinal zonality of the Laptev Sea appears not only in the hydrophysical water parameters and the structure of plankton communities, but also in their functional characteristics.  相似文献   

Stable Isotopic Composition of Particulate Organic Carbon in the Caspian Sea     

M. D. Kravchishina  A. A. Klyuvitkin  L. A. Pautova  N. V. Politova  A. Yu. Lein 《Oceanology》2018,58(1):45-56

The data on the isotopic composition of particulate organic carbon (δ¹³C_POC) in the Caspian Sea water in summer–autumn 2008, 2010, 2012, and 2013 are discussed in the paper. These data allowed as to reveal the predominant genesis of organic carbon in suspended particulate matter of the active seawater layer (from 0 to 40 m). The δ¹³C_POC =–27‰ (PDB) and δ¹³C_POC =–20.5‰ (PDB) values were taken as the reference data for terrigenous and planktonogenic organic matter, respectively. Seasonal (early summer, late summer, and autumn) variations in the composition of suspended particulate matter in the active sea layer were revealed. A shift of δ¹³C_POC towards greater values was seen in autumn (with a slight outburst in the development (bloom) of phytoplankton) in comparison with summer (with large accumulations and an extraordinary phytoplankton bloom confined to the thermocline area). The seasonal dynamics of autochthonous and allochthonous components in the suspended particulate matter of the Middle and Southern Caspian Sea was studied with the use of data on the concentration of particulate matter and chlorophyll a, the phytoplankton biomass and the POC content.  相似文献