Diatom oxygen isotope records of Northern Eurasia as indicators of environmental, hydrological and climate changes in the regions
Kostrova, S.; Bailey, H.; Biskaborn, B.; Chapligin, B.; Dvornikov, Y.; Ekaykin, A.; Fernandoy, F.; Kozachek, A.; Kuhn, G.; Ludikova, A.; Meister, P.; Nazarova, L.; Pestryakova, L.; Shibaev, Y.; Syrykh, L.; Meyer, H. (2022-09-02)
Kostrova, S.; Bailey, H.; Biskaborn, B.; Chapligin, B.; Dvornikov, Y.; et al. (2022) Diatom oxygen isotope records of Northern Eurasia as indicators of environmental, hydrological and climate changes in the regions. Limnology and Freshwater Biology, 4, 1444–1446. https://doi.org/10.31951/2658-3518-2022-A-4-1444
© Author(s) 2022. This work is distributed under the Creative Commons Attribution-NonCommercial 4.0 International License.
https://creativecommons.org/licenses/by-nc/4.0/
https://urn.fi/URN:NBN:fi-fe2023060151448
Tiivistelmä
Abstract
The environmental, hydrological and climate dynamics were assessed in Northern Eurasia during the Holocene. The reconstructions are based on oxygen isotope composition of acustrine diatom silica (δ¹⁸Odiatom) preserved in sediment cores from Ladoga, Bolshoye Shchuchye and Emanda lakes. Interpretation of the δ¹⁸Odiatom data is supported by a comprehensive study of modern isotope hydrology and analysis of local and regional proxies. The Northern Eurasia δ¹⁸Odiatom records are characterized by pronounced short term variations (1.5–5‰), pointing to the unstable climatic and hydrological conditions in the study regions. All records have clearly demonstrated a gradual depletion over the Holocene in their δ¹⁸Odiatom values by ~3–4‰, which follows the trend of decreasing summer insolation, as well as the temperature history of the Northern Hemisphere (NH), indicating a positive response of diatom oxygen isotope signal to large-scale climate changes.
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