Abstract
Data on the interaction of the land-sea system have been obtained based on complex palynological analysis (pollen and spores of terrestrial plants and cysts of dinoflagellates and green algae) and the SEM analysis of sediments from boreholes drilled on the Laptev Sea’s eastern shelf and dated by the radiocarbon method. The spore and pollen ensemble revealed for the first time in late-glacial sediments of the boreholes indicates that warming which started within the time interval 15.6–10.7 ka ago was accompanied by short-term cooling events. Sedge and herb phytocoenosis predominated in the vegetation cover of East Arctic Siberia during the cooling. The climate warming favored the distribution of shrub birch tundra. The results of the analysis of organic-walled phytoplankton and the low value of the AH criterion indicate cold-water conditions with a longstanding ice sheet at sea. After the interval that ended 10.7 ka ago, thermophilic species of dinocysts appeared on the outer shelf, and the AH-criterion value increased, which suggests an active inflow of relatively warm North-Atlantic water to the shelf. Based on the comparison of the obtained results, an inference has been made about frequent changes of the climate in the region and the environment in the eastern part of the Laptev Sea during the deglaciation epoch.
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Original Russian Text © O.D. Naidina, 2009, published in Stratigrafiya. Geologicheskaya Korrelyatsiya, 2009, Vol. 17, No. 5, pp. 95–108.
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Naidina, O.D. Environmental changes in the eastern shelf of the Laptev Sea in the late-glacial time. Stratigr. Geol. Correl. 17, 544–557 (2009). https://doi.org/10.1134/S0869593809050062
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DOI: https://doi.org/10.1134/S0869593809050062