Paleoclimate investiations on sediment core PG1984 from Lake Sysy-Kyuele, northern Siberia

In northeastern Siberia, Russia, a 1.2 m sediment core was retrieved and radiocarbon dated from a small and shallow lake located at the western side of the lower Lena River (N 69°24', E 123°50', 81 m a.s.l.). The objective of this paper is to reconstruct the palaeoenvironmental variability and to infer major palaeoclimate trends that have occurred since ~ 13.3 cal. kyrs BP. We analysed the diatom assemblages, sedimentology (grain size, total organic carbon (TOC), total nitrogen (TN)), and the elemental and mineralogical composition using X-ray fluorescence (XRF) and X-ray diffractometry (XRD) of the sediment core. Our results show parallel changes in the diatom species composition and sediment characteristics. Enhanced minerogenic sediment input and the occurrence of pyrite is indicative of a cold period between ~ 12.7-11.6 cal. kyrs BP. The diatom data enable a qualitative inference about the local ecological conditions to be made, and reveal an oligotrophic lake system with alkaline and cold conditions during the earliest Holocene. Moderately warmer climates are inferred for the period from ~ 9.1 to 5.7 cal. kyrs BP. The major shift in the diatom assemblage, from dominance of small benthic fragilarioid taxa to a more complex diatom flora with an influx of several achnanthoid and naviculoid diatom species, occurred after a transitional period of about 1400 years (7.1 to 5.7 cal. kyrs BP) at ~ 5.7 cal. kyrs BP, indicating a circumneutral and warmer hydrological regime during the Holocene thermal maximum (HTM). Diatom valve concentrations declined starting ~ 2.8 cal. kyrs BP, but have been rising again since less than or equalt to 600 cal. years BP. This has occurred in parallel to the increased presence of acidophilous diatom taxa (e.g. Eunotia spp.) and decreased presence of small benthic fragilarioid species in the most recent sediments, which is interpreted as the result of neoglacial cooling and subsequent recent climate warming. Our findings are compared to other lake-inferred climate reconstructions along the Lena River. We conclude that the timing and spatial variability of the HTM in the lower Lena River area reveal a temporal delay from north to south.

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Cite this as

Biskaborn, Boris K, Herzschuh, Ulrike, Bolshiyanov, Dimitry Yu, Savelieva, Larissa A, Diekmann, Bernhard (2012). Dataset: Paleoclimate investiations on sediment core PG1984 from Lake Sysy-Kyuele, northern Siberia. https://doi.org/10.1594/PANGAEA.776490

DOI retrieved: 2012

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.776490
Author Biskaborn, Boris K
Given Name Boris K
Family Name Biskaborn
More Authors
Herzschuh, Ulrike
Bolshiyanov, Dimitry Yu
Savelieva, Larissa A
Diekmann, Bernhard
Source Creation 2012
Publication Year 2012
Resource Type application/zip - filename: Biskaborn_2012
Subject Areas
Name: LandSurface

Name: Lithosphere

Name: Paleontology

Related Identifiers
Title: Environmental variability in northeastern Siberia during the last ~13300 yr inferred from lake diatoms and sediment-geochemical parameters
Identifier: https://doi.org/10.1016/j.palaeo.2012.02.003
Type: DOI
Relation: IsSupplementTo
Year: 2012
Source: Palaeogeography, Palaeoclimatology, Palaeoecology
Authors: Biskaborn Boris K , Herzschuh Ulrike , Bolshiyanov Dimitry Yu , Savelieva Larissa A , Diekmann Bernhard .