Isotopic Composition of Nd,Pb, and Sr in Modern Bottom Sediments of the Barents Sea     

Maslov  A. V.  Kuznetsov  A. B.  Politova  N. V.  Kozina  N. V.  Novigatsky  A. N.  Shevchenko  V. P. 《Doklady Earth Sciences》2019,485(1):268-272

Doklady Earth Sciences - The isotopic characteristics (εNd, 207Pb/206Pb, and 87Sr/86Sr) of the modern bottom sediments sampled in the Barents Sea during the 67th voyage of the R/V Akademik...  相似文献   

Role of Zooplankton in the Vertical Mass Flux in the Kara and Laptev Seas in Fall     

A. V. Drits  M. D. Kravchishina  A. F. Pasternak  A. N. Novigatsky  O. M. Dara  M. V. Flint 《Oceanology》2017,57(6):841-854

The role of zooplankton in the vertical mass flux in the Kara and Laptev seas was studied during cruise 63 of the R/V Akademik Mstislav Keldysh in August–October 2015. Mass fluxes were estimated using sediment trap samples. The maximum values of the total vertical flux (19600 mg m^?2 day^?1) and particulate organic carbon (POC) flux (464 mg C m^?2 day^?1) were measured close to the Lena River Delta in the Laptev Sea. In the Kara Sea, the total flux (80–2700 mg m^?2 day^?1) and the POC flux (17–130 mg C m^?2 day^?1) were substantially higher than the estimates published earlier. The fecal pellet flux varied from 2 to 92 mg C m^?2 day^?1 and made up 4–190% of the total organic carbon flux. The mineral composition of fecal pellets largely mirrored that of suspended particulate matter. Clay minerals in the fecal pellets were more abundant than in particulate matter in the areas with noticeable freshwater impact. The flux of zooplankton carcasses varied from 0.1 to 66.4 mg C m^?2 day^?1 and made up 0.2–72% of total POC flux. The results are discussed in relation to the abundance and composition of zooplankton, the concentration and composition of suspended particulate matter, hydrophysical conditions, and methods of sample preparation for analysis.  相似文献   

The North Pole Region: First Data on the Snow–Sea Ice–Ice Water Sedimentation System     

Novigatsky  A. N.  Lisitzin  A. P. 《Doklady Earth Sciences》2018,483(2):1534-1538

Doklady Earth Sciences - The dispersed sedimentary material in the snow–ice cover near the North Pole was analyzed directly for the first time. The composition of sediments in the...  相似文献   

Concentrations and composition of aerosols and particulate matter in surface waters along the transatlantic section     

I. A. Nemirovskaya  A. P. Lisitzin  A. N. Novigatsky  Z. U. Redzhepova  O. M. Dara 《Doklady Earth Sciences》2016,469(1):680-685

Along the transatlantic section from Ushuaia to Gdańsk (March 26–May 7, 2015; cruise 47 of R/V Akademik Ioffe), data were obtained on the concentrations of aerosols in the near-water layer of the atmosphere and of particulate matter in surface waters, as well as of organic compounds within the considered matter (C_org, chlorophyll a, lipids, and hydrocarbons). The concentrations of aerosols amounted to 1237–111 739 particles/L for the fraction of 0.3–1 μm and to 0.02–34.4 μg/m²/day for the matter collected by means of the network procedure. The distribution of aerosols is affected by circumcontinental zoning and by the fluxes from arid areas of African deserts. The maximum concentration of the treated compounds were found in the river–sea frontal area (the runoff of the Colorado River, Argentina), as well as when nearing the coasts, especially in the English Channel.  相似文献   

Comparative study of vertical suspension fluxes from the water column,rates of sedimentation,and absolute masses of the bottom sediments in the White Sea basin of the Arctic Ocean     

A. P. Lisitzin  A. N. Novigatsky  R. A. Aliev  V. P. Shevchenko  A. A. Klyuvitkin  M. D. Kravchishina 《Doklady Earth Sciences》2015,465(2):1253-1256

A new approach using dispersed organic matter of the water column in sedimentation traps in comparison with the surface layer of the bottom sediments is applied for the study of marine sedimentation. This approach provides the opportunity for an in situ (by fluxes of sedimentary matter in the water column) study of modern sedimentation in the surface layers of the bottom sediments and tracing the changes in the environment and climate at a new technological level. This also allows us to choose the reverse task: to reconstruct the fluxes of the matter and chemical elements in ancient seas by the rates (or absolute masses) of sedimentation.  相似文献   

First Data on the Geochemical Speciation of Trace Metals in the Vertical Fluxes of Dispersed Sedimentary Matter in the White Sea     

Demina  L. L.  Budko  D. F.  Lisitzin  A. P.  Novigatsky  A. N. 《Doklady Earth Sciences》2018,480(1):689-693

The contribution of different geochemical processes in the accumulation of metals in dispersed sedimentary matter collected by ADOO was estimated for the first time for the White Sea system. The contents of Al, Fe, Cr, Ni, Со, and Мо (from 60 to 90% of the total content) are mainly controlled by terrigenous processes. The group of geochemically mobile elements includes Mn, Cu, Pb, and Cd; the sum of their forms 1–3, which include the contribution of absorption−desorption and formation of authigenic hydroxides and organic compounds, accounts for, on average, from 52 to 83 Mn %. With increasing water depth, the fraction of the lithogenic form remains either constant or increases insignificantly. In contrast, Mn shows a sharp increase in geochemically mobile forms, heavy metals (Pb, Cu, Mo, Co, and Cd) of which are associated with.

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The River–Sea Transition Zone (Marginal Filter) of the Northern Dvina River as an Effective Trap of Riverine Sedimentary Matter on Its Way to the Open Area of the White Sea     

Gordeev  V. V.  Shevchenko  V. P.  Novigatsky  A. N.  Kochenkova  A. I.  Starodymova  D. P.  Lokhov  A. S.  Belorukov  S. K.  Yakovlev  A. E. 《Oceanology》2022,62(2):221-230

Oceanology - The article presents the results of generalizing the data of 20 years of research in the river–sea transition zone of the Northern Dvina River and White Sea (marginal filter...  相似文献   

On vertical particle fluxes in the Caspian Sea     

V. N. Lukashin  A. P. Lisitzin  A. N. Novigatsky  E. I. Musaeva  A. K. Ambrosimov  L. A. Gayvoronskaya 《Oceanology》2014,54(2):195-204

The first results of studies of vertical fluxes of sediment particles using the sediment traps at the Trans-Caspian section are presented. The flux values and distribution regularities are established. The fluxes of particles forming the sediment are also determined. The intra-annual variability in the fluxes corresponds to the seasonal variability of the biological activity. Above the northern slope of the Derbent Basin, the maximum vertical fluxes are recorded in the winter, which is caused by the intensification of the near-bottom currents.  相似文献   

Multidisciplinary studies of the caspian sea system during cruise 39 of the R/V Rift     

A. K. Ambrosimov  A. A. Klyuvitkin  Yu. A. Goldin  E. E. Zakharova  A. O. Korzh  M. D. Kravchishina  A. D. Mutovkin  A. N. Novigatsky  N. V. Politova  A. S. Savvichev  A. L. Chul’tsova 《Oceanology》2014,54(3):395-399

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Composition of fragmental minerals of the surface layer of bottom sediments in the Caspian Sea     

N. V. Kozina  A. N. Novigatsky 《Oceanology》2014,54(3):348-364

The mineral composition of heavy and light subfractions of the modern bottom sediments of the Caspian Sea is studied. The concentration of the minerals in the Caspian Sea made it possible to identify nine terrigeneous mineralogical provinces in its area. Based on the mineral composition of the heavy subfraction of the bottom sediments, the main sources of the fragmentary material supply are established. The distribution of the terrigeneous minerals over the bottom area in the modern bottom sediments of the Caspian Sea depends on the sources of the fragmentary material; the stability and flotation properties of minerals; the morphology of the bottom; and the hydrodynamic conditions.  相似文献