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Paleolimnological reconstructions of Holocene Environments and Climate from Lake Lyadhej-To, Ural Mountains, Northern Russia

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Citation:
Cremer, H. , Andreev, A. , Hubberten, H. W. and Wischer, F. (2004): Paleolimnological reconstructions of Holocene Environments and Climate from Lake Lyadhej-To, Ural Mountains, Northern Russia , Arctic, antarctic and alpine research, 36 (2), pp. 147-155 .
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Abstract:

A sediment core recovered in Lake Lyadhej-To at the northwestern edge of the Ural Mountains reflects the complete Holocene environmental history from ~11,000 cal. yrs BP. Five limnological episodes are identified in the diatom and geochemical records. The initial lake stage, Episode I (~11,000-10,850 cal. yrs BP), was characterized by the absence of biogenic production and a high influx of clastic sediments. Episode II (~10,850-8650 cal. yrs BP) is characterized by ice-free conditions during summer, highest bioproductivity, strong growth of planktic diatoms and anoxic bottom waters. This period represents the Holocene climatic optimum. Deterioration of climatic conditions commenced in Episode III (~8650-7000 cal. yrs BP) as indicated by distinctly lower bioproductivity and longer persistence of winter ice on the lake. During Episode IV (~7000-2500 cal. yrs BP) the diatom and pollen records indicate that temperatures were cool and the growing season was short. Finally, in Episode V (~2500 cal. yrs BP to present) limnological conditions, indicated by increased organic carbon and diatom deposition, initially suggest improved conditions followed by a return to modern conditions beginning ~500 cal. yrs BP. The pollen stratigraphy from Lake Lyadhej-To is consistent with other paleoclimatic records from northern Eurasia, confirming rapid postglacial warming, the presence of dense tree forests during the climatic optimum and finally a gradual southward retreat of the treeline towards its modern location.

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