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A 2000-year record of lake ontogeny and climate variability from the north-eastern European Russian Arctic
Stockholm University, Faculty of Science, Department of Physical Geography.
Stockholm University, Faculty of Science, Department of Physical Geography.
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Number of Authors: 5
2017 (English)In: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 27, no 3, 339-348 p.Article in journal (Refereed) Published
Abstract [en]

A lake sediment record from the north-eastern European Russian Arctic was examined using palaeolimnological methods, including subfossil chironomid and diatom analysis. The objective of this study is to disentangle environmental history of the lake and climate variability during the past 2000 years. The sediment profile was divided into two main sections following changes in the lithology, separating the limno-telmatic phase between similar to 2000 and 1200 cal. yr BP and the lacustrine phase between similar to 1200 cal. yr BP and the present. Owing to the large proportion of semi-terrestrial chironomids and poor modern analogues, a reliable chironomid-based temperature reconstruction for the limno-telmatic phase was not possible. However, the lacustrine phase showed gradually cooling climate conditions from similar to 1200 cal. yr BP until similar to 700 cal. yr BP. The increase in stream chironomids within this sediment section indicates that this period may also have had increased precipitation that caused the adjacent river to overflow, subsequently transporting chironomids to the lacustrine basin. After a short-lived warm phase at similar to 700 cal. yr BP, the climate again cooled, and a progressive climate warming trend was evident from the most recent sediment samples, where the biological assemblages seem to have experienced an eutrophication-like response to climate warming. The temperature reconstruction showed more similarities with the climate development in the Siberian side of the Urals than with northern Europe. This study provides a characteristic archive of arctic lake ontogeny and a valuable temperature record from a remote climate-sensitive area of northern Russia.

Place, publisher, year, edition, pages
2017. Vol. 27, no 3, 339-348 p.
Keyword [en]
Arctic Russia, chironomids, climate change, diatoms, palaeolimnology, quantitative reconstruction
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-142456DOI: 10.1177/0959683616660168ISI: 000395385500003OAI: oai:DiVA.org:su-142456DiVA: diva2:1096653
Available from: 2017-05-18 Created: 2017-05-18 Last updated: 2017-05-18Bibliographically approved

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