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Datasets of project "Siberian River Run-Off"

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  1. Table 3: Average accumulation rates of bulk sediments and total organic carbon for different time slices

    Stein, Ruediger; Fahl, Kirsten; Dittmers, Klaus Hauke; Niessen, Frank; Stepanets, Oleg V

  2. Table 2: AMS14C-datings performed on marine bivalves from 11 sediment cores

    Stein, Ruediger; Fahl, Kirsten; Dittmers, Klaus Hauke; Niessen, Frank; Stepanets, Oleg V

  3. Sediment investigations in the Kara Sea

    Stein, Ruediger; Fahl, Kirsten; Dittmers, Klaus Hauke; Niessen, Frank; Stepanets, Oleg V
    AMS-14C dated sediment cores from the Ob and Yenisei estuaries and the adjacent inner Kara Sea were investigated to determine the siliclastic and organic carbon fluxes and their relationship to paleoenvironmental changes. The variability of sediment fluxes during Holocene times is related to the post-glacial sea-level rise and changes in river discharge and coastal erosion input. Whereas during the late/middle Holocene most of the terrigenous sediments were deposited in the estuaries and the areas directly off the estuaries, huge amounts of sediments accumulated on the Kara Sea shelf farther north during the early Holocene before about 9 Cal. kyrs. BP....

  4. Pollen record and age determination of a sediment core from the Kara Sea

    Kraus, Matthias; Matthiessen, Jens; Stein, Ruediger
    AMS-14C dated sediment cores from the Ob and Yenisei estuaries and the adjacent inner Kara Sea were investigated to determine the siliclastic and organic carbon fluxes and their relationship to paleoenvironmental changes. The variability of sediment fluxes during Holocene times is related to the post-glacial sea-level rise and changes in river discharge and coastal erosion input. Whereas during the late/middle Holocene most of the terrigenous sediments were deposited in the estuaries and the areas directly off the estuaries, huge amounts of sediments accumulated on the Kara Sea shelf farther north during the early Holocene before about 9 Cal. kyrs. BP....

  5. Table 1: AMS 14C age dating of sediment core BP99-04

    Kraus, Matthias; Matthiessen, Jens; Stein, Ruediger

  6. Table 1: Diatom distribution in surface sediments of the Kara Sea

    Polyakova, Ye I
    Diatom assemblages in 62 surface sediment samples from the outer Ob and Yenisei estuaries and the adjacent inner Kara Sea shelf were examined in relation to environmental conditions. Concentrations of diatoms reflect the biological productivity of surface waters along with specific water mass processes of diatom valve deposition in the zone of intermixing of riverine and marine waters. An inverse relationship between total concentration of diatom valves in sediments and surface water salinity is found. Extremely high abundances of diatom valves (up to 82.4 million valves/g sediment) are observed in the outer Ob and Yenisei estuaries (salinity < 5) and...

  7. Results from ikaite investigations in the Kara Sea

    Kodina, Ludmilla A; Tokarev, V G; Vlasova, Ludmilla N; Korobeinik, G S
    The authigenic carbonate mineral ikaite is specific of low-temperature high latitude environments. The depletion of ikaite carbon in 13C isotopes in most cases implies a causal relation of ikaite generation with methane geochemistry. In this paper we present new data on ikaite minerals in Holocene sediments sampled along the Yenisei channel at the southern (74°N) and northern (77°N) ends. Stable carbon isotopes of the ikaite crystals were studied in conjunction with the hydrochemistry and isotope geochemistry of the sediments. Pore water and natural gas samples were separated from sediments to describe the methane carbon isotope distribution pattern throughout two sedimentary...

  8. Table 3: Methane concentration and carbon isotope composition in sediment core BP01-26

    Kodina, Ludmilla A; Tokarev, V G; Vlasova, Ludmilla N; Korobeinik, G S

  9. Table 1: Sampling locations with environmental parameters and ikaite crystals

    Kodina, Ludmilla A; Tokarev, V G; Vlasova, Ludmilla N; Korobeinik, G S

  10. Table 1: Station list with macrobenthos biomass results from the ocean floor

    Klages, Michael; Deubel, Hendrik; Rachor, Eike
    Among the Siberian shelf seas the Kara Sea is most strongly influenced by riverine runoff with nearly 1500 km fresh water discharge per year. This fresh water, discharged mainly by Ob and Yenisei, contains about 3.1 * 106 and 4.6 * 106 tons of total organic carbon per year, respectively (Gordeev et al. 1996). Little is known about the relevance of this organic material for biological communities, neither for the Kara Sea nor for the adjacent deep basins of the central Arctic Ocean. Aiming at elucidating the fate of fluvial matter transported from the rivers via estuaries into the central...

  11. Meroplankton in the Kara Sea

    Fetzer, Ingo
    Meroplankton was sampled at 11 stations in the southern Kara Sea and the Yenisei Estuary in September 2000. Larvae of 29 benthic taxa representing 10 higher groups were identified. Meroplankton was present at almost all stations and most depth levels. The two most abundant groups were Echinodermata (68%) and Polychaeta (26%). Echinoderms dominated total meroplankton locally due to mass occurrences of Ophiopluteus larvae. The relative group composition was highly variable and seemed to depend mainly on the local hydrographic pattern. Comparison of meroplanktonic data with the distribution of the adults revealed for Spionida and Bivalvia a 'downstream' transport of the...

  12. Table 1: Abundance of meroplankton in the Kara Sea

    Fetzer, Ingo

  13. Table 3: Comparison of freshwater species in Ob and Yenisei during the 1997 cruise

    Nöthig, Eva-Maria; Okolodkov, Yuri; Larionov, Viktor V; Makarevich, Pavel R
    Phytoplankton biomass distribution (chlorophyll a, chl. a) and species composition (cell numbers) were investigated during three expeditions to the Kara Sea with "Akademik Boris Petrov" (BP) in 1997, 1999, and 2000. The distribution of biomass in the estuaries of Ob and Yenisei showed a similar range in 1997 (0.2 to 3.2 µg/l) and 2000 (0.4 to 3.5 ug/l); higher chl. a concentrations during these two years were found in Yenisei than in Ob. In 1999, phytoplankton biomass in the Ob and Ob Estuary was much higher than in 1997 and 2000, with maximum values above 10.0 ug chl. a/l. In...

  14. Radionuclide measurements in sediments and water of the Kara Sea

    Stepanets, Oleg V; Barisov, A; Ligaev, Alexander N; Solovjeva, Galina Y; Sisov, E; Komarevsky, V M
    In this report, the results of a 2000-2001 radiogeoecological investigation are presented for the region of the Ob and Yenisei estuaries and the adjacent Kara Sea. In order to study the behaviour and migration of Cs, Sr and Pu radionuclides in a river - sea system experimental research on the distribution of these radionuclides in the water column and surface sediments has been carried out. In addition, the role of suspended and dissolved organic matter on the behaviour of radionuclides in water solutions has been studied. The 137Cs and 239,240Pu concentrations in the upper 0-2cm layer of the sediments varied...

  15. Table 3: Results of measurement of Strontium and Plutonium radionuclides

    Stepanets, Oleg V; Barisov, A; Ligaev, Alexander N; Solovjeva, Galina Y; Sisov, E; Komarevsky, V M

  16. Table 2: Results of measurement of Cs-137 in water

    Stepanets, Oleg V; Barisov, A; Ligaev, Alexander N; Solovjeva, Galina Y; Sisov, E; Komarevsky, V M

  17. Table 1: Results of lithological structure of some surface sediments and activity of 137Cs

    Stepanets, Oleg V; Barisov, A; Ligaev, Alexander N; Solovjeva, Galina Y; Sisov, E; Komarevsky, V M

  18. Geochemistry on water profiles from the Kara Sea

    Beeskow, Bettina; Rachold, Volker
    As a part of the Russian-German project "Siberian River-Runoff (SIRRO)" the major element composition of the dissolved load and the major and trace element composition of particulate load and bottom sediment of the Yenisei River and Estuary were analyzed and examined in context of the basin lithology and climate. In addition, the processes controlling the transformation of the river load in the estuarine mixing zone were investigated. The chemical composition of the dissolved and particulate load of the Yenisei fluvial endmember is generally comparable to that of other major world rivers. The dissolved load is chiefly controlled by carbonate weathering and...

  19. Physical properties of 22 sediment cores from the Kara Sea

    Dittmers, Klaus Hauke; Niessen, Frank; Stein, Ruediger
    High-resolution acoustic data and several sediment gravity cores taken in the Ob and Yenisei estuaries allow us to balance the Holocene sediment budget of both rivers and to reconstruct their sedimentary history. Cores were radiocarbon dated and linked to acoustic profiles using whole-core physical properties. The Ob and Yenisei estuaries, with their sea water fresh water mixing zone, act as major sediment sinks for fluvial derived terrigeneous material in Holocene times. Most of the suspended and large amounts of dissolved matter precipitate in this zone termed "marginal filter". High thickness of Holocene sediments occurs between 72°N and 73°30'N where a distinct...

  20. Reflection seismic profiles of "Akademik Boris Petrov" Kara Sea expedition in 2001

    Niessen, Frank; Kopsch, Conrad

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