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  • 1
    Electronic Resource
    Electronic Resource
    Coastal erosion vs riverine sediment discharge in the Arctic Shelf seas (2000)
    Springer
    International journal of earth sciences 89 (2000), S. 450-460 
    Details
    ISSN: 1437-3262
    Keywords: Laptev Sea Beaufort Sea Coastal erosion Fluvial sediment discharge Sediment budget
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract. This article presents a comparison of sediment input by rivers and by coastal erosion into both the Laptev Sea and the Canadian Beaufort Sea (CBS). New data on coastal erosion in the Laptev Sea, which are based on field measurements and remote sensing information, and existing data on coastal erosion in the CBS as well as riverine sediment discharge into both the Laptev Sea and the CBS are included. Strong regional differences in the percentages of coastal erosion and riverine sediment supply are observed. The CBS is dominated by the riverine sediment discharge (64.45×106 t a–1) mainly of the Mackenzie River, which is the largest single source of sediments in the Arctic. Riverine sediment discharge into the Laptev Sea amounts to 24.10×106 t a–1, more than 70% of which are related to the Lena River. In comparison with the CBS, the Laptev Sea coast on average delivers approximately twice as much sediment mass per kilometer, a result of higher erosion rates due to higher cliffs and seasonal ice melting. In the Laptev Sea sediment input by coastal erosion (58.4×106 t a–1) is therefore more important than in the CBS and the ratio between riverine and coastal sediment input amounts to 0.4. Coastal erosion supplying 5.6×106 t a–1 is less significant for the sediment budget of the CBS where riverine sediment discharge exceeds coastal sediment input by a factor of ca. 10.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310000113
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Mechanisms of Late Pleistocene authigenic Fe–Mn-carbonate formation at the Laptev Sea continental slope (Siberian Arctic) (2018)
    Springer
    In:  Arktos, 4 (Article 2).
    Details
    Publication Date: 2021-02-08
    Description: Study of the microstructure and isotopic composition of authigenic tubule-shaped carbonate concretions from sediment core PS51/154-11 on the western Laptev Sea continental slope (present water depth 270 m) has allowed for reconstruction of the conditions prevailing during their formation and identification of the mechanisms controlling their genesis. Concretions were collected from the basal sediment unit with an extrapolated age estimate of 16.3–17.6 cal.ka. Crystallization of carbonate tubules occurred at the beginning of the last deglaciation when the site was located in the proximity to the former coastline and the mouths of the Olenek and Anabar-Khatanga rivers in water depths of about 150–170 m. Microprobe analysis showed that the studied carbonate tubules consist of the minerals belonging to the siderite–rhodochrosite isomorphic series. The measured isotopic composition of δ13С and δ18O in the carbonates varies between − 21.0 and − 17.0‰ and between − 9.86 and 1.72‰ VPDB, respectively. The δ18O values in the authigenic carbonates give evidence for the gradual transition from a freshwater affected to modern-like marine sedimentation environment during carbonate crystallization. Water freshening is confirmed by the co-occurrence of authigenic Fe–Mn carbonates and Fe-phosphate vivianite that is a typical mineral of freshwater environments. The dominant source of dissolved inorganic carbon in the pore water was the isotopically light carbon derived from the diagenetic decomposition of organic matter. Two possible scenarios of authigenic carbonates formation are proposed: penetration of freshened ground waters and/or enhanced freshwater influence during short seasonal floods in combination with geochemical processes in a narrow marginal filter zone that was located extremely close to the Laptev Sea continental slope and the studied core site.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s41063-018-0036-0
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Climatic Changes in the Dynamic Topography and Geostrophic Circulation of the Arctic Ocean (2018)
    Springer
    In:  Doklady Earth Sciences, 480 (1). pp. 685-688.
    Details
    Publication Date: 2021-02-08
    Description: According to historical oceanographic data, anomalies in the dynamic topography during the winter period were calculated and two climatic stages of dynamic condition of the Arctic Ocean were defined: 1949–1993 and 2007–2013. The associativity of opposition of anomalies in the dynamic topography of the Eurasian and Amerasian basins with fluctuations in the thermal condition of the Northern Atlantic and Pacific oceans, the indexes of atmospheric circulation, river runoff, and change in the area of ice in August of the Laptev, East Siberian, and Chukchi seas is established.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1134/S1028334X18050318
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Changes in the deposition of terrestrial organic matter on the Laptev Sea shelf during the Holocene: evidence from stable carbon isotopes (2000)
    Springer
    In:  International Journal of Earth Sciences, 89 (3). pp. 563-568.
    Details
    Publication Date: 2019-09-23
    Description: Stable carbon isotope ratios in the organic fraction of surface sediments from the Laptev Sea shelf were analyzed in order to study the modern distribution pattern of terrestrial organic matter. The delta C-13 signature of the surface sediments range from -26.6 parts per thousand near the coastal margin to -22.8 parts per thousand in the north towards the outer shelf. Characterizing the possible sources of organic matter by their delta C-13(org) signature reveals that the terrestrial influence reaches further north in the eastern than in the western Laptev Sea. Downcore records of the delta C-13(org), measured on three AMS C-14-dated cores from water depths between 46 and 77 m, specify the spatial and temporal changes in the deposition of terrestrial organic matter on the Laptev Sea shelf during the past 12.7 ka. The major depositional changes of terrestrial organic matter occurred between 11 and 7 ka and comprised the main phase of the southward retreat of the coastline and of the river depocenters due to the postglacial sea level rise.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s005310000128
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Coastal erosion vs riverine sediment discharge in the Arctic Shelf seas (2000)
    Springer
    In:  International Journal of Earth Sciences, 89 (3). pp. 450-460.
    Details
    Publication Date: 2019-09-23
    Description: This article presents a comparison of sediment input by rivers and by coastal erosion into both the Laptev Sea and the Canadian Beaufort Sea (CBS). New data on coastal erosion in the Laptev Sea, which are based on field measurements and remote sensing information, and existing data on coastal erosion in the CBS as well as riverine sediment discharge into both the Laptev Sea and the CBS are included. Strong regional differences in the percentages of coastal erosion and riverine sediment supply are observed. The CBS is dominated by the riverine sediment discharge (64.45x10(6) t a(-1)) mainly of the Mackenzie River, which is the largest single source of sediments in the Arctic. Riverine sediment discharge into the Laptev Sea amounts to 24.10x10(6) t a(-1), more than 70% of which an related to the Lena River. In comparison with the CBS, the Laptev Sea coast on average delivers approximately twice as much sediment mass per kilometer, a result of higher erosion rates due to higher cliffs and seasonal ice melting. Ln the Laptev Sea sediment input by coastal erosion (58.4x10(6) t a(-1)) is therefore more important than in the CBS and the ratio between riverine and coastal sediment input amounts to 0.4. Coastal erosion supplying 5.6x10(6) t a(-1) is less significant for the sediment budget of the CBS where riverine sediment discharge exceeds coastal sediment input by a factor of ca. 10.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s005310000113
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Evolution of subsea permafrost landscapes in Arctic Siberia since the Late Pleistocene: a synoptic insight from acoustic data of the Laptev Sea (2015)
    Springer
    In:  Arktos, 1 (Article 11).
    Details
    Publication Date: 2019-07-08
    Description: Using high-resolution seismic data, this study aims at investigating the evolution and morphological diversity of subsea permafrost features on the eastern Laptev Sea shelf, Arctic Siberia. Several seismic facies were recognized. These relate to the major environmental changes, which affected the Laptev Sea area before, during, and after the last global transgression. Because this shallow shelf was part of the Beringian landmass, we consider a prominent subsurface seismic basal reflector as the top of the former terrestrial permafrost table. Five zones differing in geometry, reflection patterns, depths, and continuity of the permafrost top are identified. Where visible, the upper 70 m of the sediments consists of epigenetically and syngenetically frozen ice-poor sandy deposits at the base, possibly of early last glacial age, marine isotope stages (MIS) 5 and 4. These are followed by late glacial, ice-rich facies interpreted to be MIS 3 to 2. The early Holocene (MIS 1) features well-stratified lagoonal and taberal deposits. As verified by radiocarbon-dated sediment cores, these deposits are overlain by middle to late Holocene sediments with an increasingly marine signature.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s41063-015-0011-y
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Oceanographic causes for transarctic ice transport of river discharge (1999)
    Springer
    In:  In: Land-Ocean Systems in the Siberian Arctic : Dynamics and History. , ed. by Kassens, H., Bauch, H. A., Dmitrenko, I. A. and Eicken, H. Springer, Berlin (u.a.), pp. 73-92. ISBN 3-540-65676-6
    Details
    Publication Date: 2016-01-19
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 8
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    Frazil ice formation during the spring flood and its role in transport of sediments to the ice cover (1999)
    Springer
    In:  In: Land-Ocean Systems in the Siberian Arctic : Dynamics and History. , ed. by Kassens, H., Bauch, H. A., Dmitrenko, I. A. and Eicken, H. Springer, Berlin (u.a.), pp. 125-140. ISBN 3-540-65676-6
    Details
    Publication Date: 2015-04-08
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 9
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    Determination of depositional Beryllium-10 fluxesin the area of the Laptev Sea and Beryllium-10 concentrations in water samples of high northern latitudes (1999)
    Springer
    In:  In: Land-Ocean Systems in the Siberian Arctic : Dynamics and History. , ed. by Kassens, H., Bauch, H. A., Dmitrenko, I. A. and Eicken, H. Springer, Berlin (u.a.), pp. 516-532. ISBN 3-540-65676-6
    Details
    Publication Date: 2015-04-08
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 10
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    Dynamics and history of the Laptev Sea and its continental hinterland : a summary (1999)
    Springer
    In:  In: Land-Ocean Systems in the Siberian Arctic : Dynamica and History. , ed. by Kassens, H., Bauch, H. A., Dmitrenko, I. A. and Eicken, H. Springer, Berlin (u.a.), pp. 693-711. ISBN 3-540-65676-6
    Details
    Publication Date: 2015-03-31
    Description: Russian and German scientists have investigated the extreme environmental system in and around the Laptev Sea in the Siberian Arctic. For the first time a major comprehensive research program combining the efforts of several projects addressed both oceanic and terrestrial processes, and their consequences for marine and terrestrial biota, landscape evolution as well as land-ocean interactions. The primary scientific goal of the multidisciplinary program was to decipher past climate variations and their impact on contemporary environmental changes. Extensive studies of the atmosphere, sea ice, water column, and sea-floor on the Laptev Sea Shelf, as well as of the vegetation, soil development, carbon cycle, permafrost behaviour and lake hydrology, and sedimentationon Taymyr Peninsula and Severnaya Zemlya Archipelago were performed during the past years under a framework of joint research activities. They included land and marine expeditions during spring (melting), summer (ice free), and autumn (freezing) seasons. The close bilateral cooperation between many institutions in Russia and Germany succeeded in drawing a picture of important processes shaping the marine and terrestrial environment in northern Central Siberia in Late Quaternary time. The success of the projects, which ended in late 1997, resulted in the definition and establishment of a new major research effort which will concentrate on establishing a better understanding of the paleoclimatic and paleoenvironmental record of the area. This is important because it allows to be able to judge rates and extremes of potential future environmental changes.
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
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