Holocene changes in paleohydrological conditions in the Laptev Sea based on aquatic palynomorph assemblages
Based on the study of aquatic palynomorph assemblages in two Holocene sediment cores obtained from the eastern Laptev Sea shelf, the main stages in the postglacial transgression are reconstructed for the last 11.3 ky. During that period, the inner shelf of the Laptev Sea (sea depth of 51 m) was alre...
| Published in: | Oceanology |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Pleiades Publishing
2006
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| Subjects: | |
| Online Access: | https://oceanrep.geomar.de/id/eprint/911/ https://oceanrep.geomar.de/id/eprint/911/1/2006_Klyuivitkina-Bauch-Holocene_Oceanology-46.pdf http://link.springer.com/article/10.1134/S0001437006060117 https://doi.org/10.1134/S0001437006060117 |
| Summary: | Based on the study of aquatic palynomorph assemblages in two Holocene sediment cores obtained from the eastern Laptev Sea shelf, the main stages in the postglacial transgression are reconstructed for the last 11.3 ky. During that period, the inner shelf of the Laptev Sea (sea depth of 51 m) was already flooded representing an area of intense freshwater sedimentation in the immediate proximity from the river mouth in the period of 11.3 to 10.3 ky B.P. Approximately 1.0–1.5 ky later, the inner shelf (sea depth of 32 m) was flooded, although it remained under the influence of the river runoff up to 7.4 ky B.P. The period of 10.3–7.4 ky B.P. was marked by the dominant dinoflagellate cysts Operculodinium centrocarpum among the aquatic palynomorphs, the appearance of more thermophilic dinoflagellate species, and elevated values of the AH ratio, which indicates an enhanced influx of relatively warm North Atlantic waters to the Laptev Sea shelf. The environment close to the present-day one became dominant on the outer and inner shelf of the Laptev Sea approximately 8.6 and 7.4 ky B.P., respectively. |
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