Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic)
This study is based on multiproxy data gained from a 14C-dated 6.5 m long sediment core and a 210Pb-dated 23 cm short core retrieved from Lake Rauchuagytgyn in Chukotka, Arctic Russia. Our main objectives are to reconstruct the environmental history and ecological development of the lake during the...
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Copernicus GmbH
2023
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Online Access: | https://epic.awi.de/id/eprint/57853/ https://epic.awi.de/id/eprint/57853/1/bg-20-1691-2023.pdf https://hdl.handle.net/10013/epic.76a6cf92-a9c8-4caf-a304-b3921e93e659 |
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ftawi:oai:epic.awi.de:57853 2023-07-30T04:00:06+02:00 Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) Biskaborn, Boris K Forster, Amy Pfalz, Gregor Pestryakova, Lyudmila A Stoof-Leichsenring, Kathleen Strauss, Jens Kröger, Tim Herzschuh, Ulrike 2023-05-04 application/pdf https://epic.awi.de/id/eprint/57853/ https://epic.awi.de/id/eprint/57853/1/bg-20-1691-2023.pdf https://hdl.handle.net/10013/epic.76a6cf92-a9c8-4caf-a304-b3921e93e659 unknown Copernicus GmbH https://epic.awi.de/id/eprint/57853/1/bg-20-1691-2023.pdf Biskaborn, B. K. orcid:0000-0003-2378-0348 , Forster, A. , Pfalz, G. , Pestryakova, L. A. , Stoof-Leichsenring, K. orcid:0000-0002-6609-3217 , Strauss, J. orcid:0000-0003-4678-4982 , Kröger, T. and Herzschuh, U. orcid:0000-0003-0999-1261 (2023) Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) , Biogeosciences, 20 (9), pp. 1691-1712 . doi:10.5194/bg-20-1691-2023 <https://doi.org/10.5194/bg-20-1691-2023> , hdl:10013/epic.76a6cf92-a9c8-4caf-a304-b3921e93e659 EPIC3Biogeosciences, Copernicus GmbH, 20(9), pp. 1691-1712, ISSN: 1726-4170 Article isiRev 2023 ftawi https://doi.org/10.5194/bg-20-1691-2023 2023-07-09T23:19:44Z This study is based on multiproxy data gained from a 14C-dated 6.5 m long sediment core and a 210Pb-dated 23 cm short core retrieved from Lake Rauchuagytgyn in Chukotka, Arctic Russia. Our main objectives are to reconstruct the environmental history and ecological development of the lake during the last 29 kyr and to investigate the main drivers behind bioproduction shifts. The methods comprise age-modeling, accumulation rate estimation, and light microscope diatom species analysis of 74 samples, as well as organic carbon, nitrogen, and mercury analysis. Diatoms have appeared in the lake since 21.8 ka cal BP and are dominated by planktonic Lindavia ocellata and L. cyclopuncta. Around the Pleistocene–Holocene boundary, other taxa including planktonic Aulacoseira, benthic fragilarioid (Staurosira), and achnanthoid species increase in their abundance. There is strong correlation between variations of diatom valve accumulation rates (DARs; mean 176.1×109 valves m2 a1), organic carbon accumulation rates (OCARs; mean 4.6 g m−2 a−1), and mercury accumulation rates (HgARs; mean 63.4 µg m−2 a−1). We discuss the environmental forcings behind shifts in diatom species and find moderate responses of key taxa to the cold glacial period, postglacial warming, the Younger Dryas, and the Holocene Thermal Maximum. The short-core data likely suggest recent change of the diatom community at the beginning of the 20th century related to human-induced warming but only little evidence of atmospheric deposition of contaminants. Significant correlation between DAR and OCAR in the Holocene interglacial indicates within-lake bioproduction represents bulk organic carbon deposited in the lake sediment. During both glacial and interglacial episodes HgAR is mainly bound to organic matter in the lake associated with biochemical substrate conditions. There were only ambiguous signs of increased HgAR during the industrialization period. We conclude that if increased short-term emissions are neglected, pristine Arctic lake systems can potentially ... Article in Journal/Newspaper Arctic Arctic Chukotka Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Biogeosciences 20 9 1691 1712 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
This study is based on multiproxy data gained from a 14C-dated 6.5 m long sediment core and a 210Pb-dated 23 cm short core retrieved from Lake Rauchuagytgyn in Chukotka, Arctic Russia. Our main objectives are to reconstruct the environmental history and ecological development of the lake during the last 29 kyr and to investigate the main drivers behind bioproduction shifts. The methods comprise age-modeling, accumulation rate estimation, and light microscope diatom species analysis of 74 samples, as well as organic carbon, nitrogen, and mercury analysis. Diatoms have appeared in the lake since 21.8 ka cal BP and are dominated by planktonic Lindavia ocellata and L. cyclopuncta. Around the Pleistocene–Holocene boundary, other taxa including planktonic Aulacoseira, benthic fragilarioid (Staurosira), and achnanthoid species increase in their abundance. There is strong correlation between variations of diatom valve accumulation rates (DARs; mean 176.1×109 valves m2 a1), organic carbon accumulation rates (OCARs; mean 4.6 g m−2 a−1), and mercury accumulation rates (HgARs; mean 63.4 µg m−2 a−1). We discuss the environmental forcings behind shifts in diatom species and find moderate responses of key taxa to the cold glacial period, postglacial warming, the Younger Dryas, and the Holocene Thermal Maximum. The short-core data likely suggest recent change of the diatom community at the beginning of the 20th century related to human-induced warming but only little evidence of atmospheric deposition of contaminants. Significant correlation between DAR and OCAR in the Holocene interglacial indicates within-lake bioproduction represents bulk organic carbon deposited in the lake sediment. During both glacial and interglacial episodes HgAR is mainly bound to organic matter in the lake associated with biochemical substrate conditions. There were only ambiguous signs of increased HgAR during the industrialization period. We conclude that if increased short-term emissions are neglected, pristine Arctic lake systems can potentially ... |
format |
Article in Journal/Newspaper |
author |
Biskaborn, Boris K Forster, Amy Pfalz, Gregor Pestryakova, Lyudmila A Stoof-Leichsenring, Kathleen Strauss, Jens Kröger, Tim Herzschuh, Ulrike |
spellingShingle |
Biskaborn, Boris K Forster, Amy Pfalz, Gregor Pestryakova, Lyudmila A Stoof-Leichsenring, Kathleen Strauss, Jens Kröger, Tim Herzschuh, Ulrike Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
author_facet |
Biskaborn, Boris K Forster, Amy Pfalz, Gregor Pestryakova, Lyudmila A Stoof-Leichsenring, Kathleen Strauss, Jens Kröger, Tim Herzschuh, Ulrike |
author_sort |
Biskaborn, Boris K |
title |
Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
title_short |
Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
title_full |
Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
title_fullStr |
Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
title_full_unstemmed |
Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
title_sort |
diatom responses and geochemical feedbacks to environmental changes at lake rauchuagytgyn (far east russian arctic) |
publisher |
Copernicus GmbH |
publishDate |
2023 |
url |
https://epic.awi.de/id/eprint/57853/ https://epic.awi.de/id/eprint/57853/1/bg-20-1691-2023.pdf https://hdl.handle.net/10013/epic.76a6cf92-a9c8-4caf-a304-b3921e93e659 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Arctic Arctic Lake |
geographic_facet |
Arctic Arctic Lake |
genre |
Arctic Arctic Chukotka |
genre_facet |
Arctic Arctic Chukotka |
op_source |
EPIC3Biogeosciences, Copernicus GmbH, 20(9), pp. 1691-1712, ISSN: 1726-4170 |
op_relation |
https://epic.awi.de/id/eprint/57853/1/bg-20-1691-2023.pdf Biskaborn, B. K. orcid:0000-0003-2378-0348 , Forster, A. , Pfalz, G. , Pestryakova, L. A. , Stoof-Leichsenring, K. orcid:0000-0002-6609-3217 , Strauss, J. orcid:0000-0003-4678-4982 , Kröger, T. and Herzschuh, U. orcid:0000-0003-0999-1261 (2023) Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) , Biogeosciences, 20 (9), pp. 1691-1712 . doi:10.5194/bg-20-1691-2023 <https://doi.org/10.5194/bg-20-1691-2023> , hdl:10013/epic.76a6cf92-a9c8-4caf-a304-b3921e93e659 |
op_doi |
https://doi.org/10.5194/bg-20-1691-2023 |
container_title |
Biogeosciences |
container_volume |
20 |
container_issue |
9 |
container_start_page |
1691 |
op_container_end_page |
1712 |
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1772810709037481984 |