Universität zu Köln

Baumer, Marlene M., Wagner, Bernd, Meyer, Hanno, Leicher, Niklas ORCID: 0000-0002-3367-5982, Lenz, Matthias, Fedorov, Grigory ORCID: 0000-0003-2269-4501, Pestryakova, Luidmila A. and Melles, Martin ORCID: 0000-0003-0977-9463 . Climatic and environmental changes in the Yana Highlands of north-eastern Siberia over the last c. 57 000 years, derived from a sediment core from Lake Emanda. Boreas. HOBOKEN: WILEY. ISSN 1502-3885

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Abstract

The sediment succession of Lake Emanda in the Yana Highlands was investigated to reconstruct the regional late Quaternary climate and environmental history. Hydro-acoustic data obtained during a field campaign in 2017 show laminated sediments in the north-western and deepest (up to -m) part of the lake, where a similar to 6-m-long sediment core (Co1412) was retrieved. The sediment core was studied with a multi-proxy approach including sedimentological and geochemical analyses. The chronology of Co1412 is based on C-14 AMS dating on plant fragments from the upper 4.65 m and by extrapolation suggests a basal age of c. 57 cal. ka BP. Pronounced changes in the proxy data indicate that early Marine Isotope Stage (MIS) 3 was characterized by unstable environmental conditions associated with short-term temperature and/or precipitation variations. This interval was followed by progressively colder and likely drier conditions during mid-MIS 3. A lake-level decline between 32.0 and 19.1 cal. ka BP was presumably related to increased continentality and dry conditions peaking during the Last Glacial Maximum (LGM). A subsequent rise in lake level could accordingly have been the result of increased rainfall, probably in combination with seasonally high meltwater input. A milder or wetter Lateglacial climate increased lake productivity and vegetation growth, the latter stabilizing the catchment and reducing clastic input into the lake. The Bolling-Allerod warming, Younger Dryas cooling and Holocene Thermal Maximum (HTM) are indicated by distinct changes in the environment around Lake Emanda. Unstable, but similar-to-present-day climatic and environmental conditions have persisted since c. 5 cal. ka BP. The results emphasize the highly continental setting of the study site and therefore suggest that the climate at Lake Emanda was predominantly controlled by changes in summer insolation, global sea level, and the extent of ice sheets over Eurasia, which influenced atmospheric circulation patterns.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Baumer, Marlene M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wagner, Bernd UNSPECIFIED UNSPECIFIED UNSPECIFIED Meyer, Hanno UNSPECIFIED UNSPECIFIED UNSPECIFIED Leicher, Niklas UNSPECIFIED orcid.org/0000-0002-3367-5982 UNSPECIFIED Lenz, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Fedorov, Grigory UNSPECIFIED orcid.org/0000-0003-2269-4501 UNSPECIFIED Pestryakova, Luidmila A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Melles, Martin UNSPECIFIED orcid.org/0000-0003-0977-9463 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-311491
DOI:	10.1111/bor.12476
Journal or Publication Title:	Boreas
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1502-3885
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LATE QUATERNARY GLACIATIONS; POLAR URAL MOUNTAINS; LENA RIVER DELTA; SEA-LEVEL CHANGE; VERKHOYANSK MOUNTAINS; ORGANIC-MATTER; POLLEN RECORD; HOLOCENE TRANSITION; VEGETATION HISTORY; ICE COMPLEX Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/31149