Lipid-based paleoecological and biogeochemical reconstruction of Store Saltsø, an extreme lacustrine system in SW Greenland
Polar lakes harbour a unique biogeochemistry that reflects the implications of climatic fluctuations against a susceptible yet extreme environment. In addition to polar, Store Saltsø (Kangerlussuaq, southwestern Greenland) is an endorheic lake with alkaline and oligotrophic waters that host a distin...
Published in: | Science of The Total Environment |
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Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2024
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Online Access: | https://pure.au.dk/portal/en/publications/4772d9ed-b6ca-49b0-92c6-239ab19343f3 https://doi.org/10.1016/j.scitotenv.2024.171199 http://www.scopus.com/inward/record.url?scp=85186923229&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/4772d9ed-b6ca-49b0-92c6-239ab19343f3 2024-04-14T08:12:27+00:00 Lipid-based paleoecological and biogeochemical reconstruction of Store Saltsø, an extreme lacustrine system in SW Greenland Finkel, Pablo L. Carrizo, Daniel Rasmussen, Keld R. Knudsen, Niels A.T. Parro, Victor Sánchez-García, Laura 2024-04-15 https://pure.au.dk/portal/en/publications/4772d9ed-b6ca-49b0-92c6-239ab19343f3 https://doi.org/10.1016/j.scitotenv.2024.171199 http://www.scopus.com/inward/record.url?scp=85186923229&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/en/publications/4772d9ed-b6ca-49b0-92c6-239ab19343f3 info:eu-repo/semantics/openAccess Finkel , P L , Carrizo , D , Rasmussen , K R , Knudsen , N A T , Parro , V & Sánchez-García , L 2024 , ' Lipid-based paleoecological and biogeochemical reconstruction of Store Saltsø, an extreme lacustrine system in SW Greenland ' , Science of the total Environment , vol. 921 , 171199 . https://doi.org/10.1016/j.scitotenv.2024.171199 Biogeochemistry Climate change Extreme environment Lipid biomarkers Paleoenvironment reconstruction Polar lake article 2024 ftuniaarhuspubl https://doi.org/10.1016/j.scitotenv.2024.171199 2024-03-21T15:32:46Z Polar lakes harbour a unique biogeochemistry that reflects the implications of climatic fluctuations against a susceptible yet extreme environment. In addition to polar, Store Saltsø (Kangerlussuaq, southwestern Greenland) is an endorheic lake with alkaline and oligotrophic waters that host a distinctive ecology adapted to live in such particular physico-chemical and environmental conditions. By exploring the sedimentary record of Store Saltsø at a molecular and compound-specific isotopic level, we were able to understand its ecology and biogeochemical evolution upon climate change. We employed lipid biomarkers to identify biological sources and metabolic traits in different environmental samples (shore terrace, sediment core, and white precipitates at the shore), and their succession over time to reconstruct the lake paleobiology. Different molecular ratios and geochemical proxies provided further insights toward the evolution of environmental conditions in the frame of the deglaciation history of Kangerlussuaq. The relative abundance of terrestrial (i.e., plant derived) biomarkers (odd long-chain n-alkanes, even long-chain n-alkanols, and phytosterols) in the upper half of the shore terrace versus the relatively more present aquatic biomarkers (botryococcenes and long-chain alkenones) in its lower half revealed higher lake water levels in the past. Moreover, the virtual absence of organics in the deepest section of the sediment core (32–29 cm depth) suggested that the lake did not yet exist at the northwestern shore of Store Saltsø ∼5100 years ago. According to the relative abundance of lipid biomarkers detected in the adjacent section above (29–25 cm depth), we hypothesize that the northwestern shore of Store Saltsø formed ∼4900 years ago. By combining the molecular and compound-specific isotopic analysis of lipids in a ∼360 cm sedimentary sequence, we recreated the paleobiology and evolution of an extreme lacustrine environment suitable for the study of the limits of life and the effects of climate warming. Article in Journal/Newspaper Greenland Kangerlussuaq Aarhus University: Research Greenland Kangerlussuaq ENVELOPE(-55.633,-55.633,72.633,72.633) Science of The Total Environment 921 171199 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Biogeochemistry Climate change Extreme environment Lipid biomarkers Paleoenvironment reconstruction Polar lake |
spellingShingle |
Biogeochemistry Climate change Extreme environment Lipid biomarkers Paleoenvironment reconstruction Polar lake Finkel, Pablo L. Carrizo, Daniel Rasmussen, Keld R. Knudsen, Niels A.T. Parro, Victor Sánchez-García, Laura Lipid-based paleoecological and biogeochemical reconstruction of Store Saltsø, an extreme lacustrine system in SW Greenland |
topic_facet |
Biogeochemistry Climate change Extreme environment Lipid biomarkers Paleoenvironment reconstruction Polar lake |
description |
Polar lakes harbour a unique biogeochemistry that reflects the implications of climatic fluctuations against a susceptible yet extreme environment. In addition to polar, Store Saltsø (Kangerlussuaq, southwestern Greenland) is an endorheic lake with alkaline and oligotrophic waters that host a distinctive ecology adapted to live in such particular physico-chemical and environmental conditions. By exploring the sedimentary record of Store Saltsø at a molecular and compound-specific isotopic level, we were able to understand its ecology and biogeochemical evolution upon climate change. We employed lipid biomarkers to identify biological sources and metabolic traits in different environmental samples (shore terrace, sediment core, and white precipitates at the shore), and their succession over time to reconstruct the lake paleobiology. Different molecular ratios and geochemical proxies provided further insights toward the evolution of environmental conditions in the frame of the deglaciation history of Kangerlussuaq. The relative abundance of terrestrial (i.e., plant derived) biomarkers (odd long-chain n-alkanes, even long-chain n-alkanols, and phytosterols) in the upper half of the shore terrace versus the relatively more present aquatic biomarkers (botryococcenes and long-chain alkenones) in its lower half revealed higher lake water levels in the past. Moreover, the virtual absence of organics in the deepest section of the sediment core (32–29 cm depth) suggested that the lake did not yet exist at the northwestern shore of Store Saltsø ∼5100 years ago. According to the relative abundance of lipid biomarkers detected in the adjacent section above (29–25 cm depth), we hypothesize that the northwestern shore of Store Saltsø formed ∼4900 years ago. By combining the molecular and compound-specific isotopic analysis of lipids in a ∼360 cm sedimentary sequence, we recreated the paleobiology and evolution of an extreme lacustrine environment suitable for the study of the limits of life and the effects of climate warming. |
format |
Article in Journal/Newspaper |
author |
Finkel, Pablo L. Carrizo, Daniel Rasmussen, Keld R. Knudsen, Niels A.T. Parro, Victor Sánchez-García, Laura |
author_facet |
Finkel, Pablo L. Carrizo, Daniel Rasmussen, Keld R. Knudsen, Niels A.T. Parro, Victor Sánchez-García, Laura |
author_sort |
Finkel, Pablo L. |
title |
Lipid-based paleoecological and biogeochemical reconstruction of Store Saltsø, an extreme lacustrine system in SW Greenland |
title_short |
Lipid-based paleoecological and biogeochemical reconstruction of Store Saltsø, an extreme lacustrine system in SW Greenland |
title_full |
Lipid-based paleoecological and biogeochemical reconstruction of Store Saltsø, an extreme lacustrine system in SW Greenland |
title_fullStr |
Lipid-based paleoecological and biogeochemical reconstruction of Store Saltsø, an extreme lacustrine system in SW Greenland |
title_full_unstemmed |
Lipid-based paleoecological and biogeochemical reconstruction of Store Saltsø, an extreme lacustrine system in SW Greenland |
title_sort |
lipid-based paleoecological and biogeochemical reconstruction of store saltsø, an extreme lacustrine system in sw greenland |
publishDate |
2024 |
url |
https://pure.au.dk/portal/en/publications/4772d9ed-b6ca-49b0-92c6-239ab19343f3 https://doi.org/10.1016/j.scitotenv.2024.171199 http://www.scopus.com/inward/record.url?scp=85186923229&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-55.633,-55.633,72.633,72.633) |
geographic |
Greenland Kangerlussuaq |
geographic_facet |
Greenland Kangerlussuaq |
genre |
Greenland Kangerlussuaq |
genre_facet |
Greenland Kangerlussuaq |
op_source |
Finkel , P L , Carrizo , D , Rasmussen , K R , Knudsen , N A T , Parro , V & Sánchez-García , L 2024 , ' Lipid-based paleoecological and biogeochemical reconstruction of Store Saltsø, an extreme lacustrine system in SW Greenland ' , Science of the total Environment , vol. 921 , 171199 . https://doi.org/10.1016/j.scitotenv.2024.171199 |
op_relation |
https://pure.au.dk/portal/en/publications/4772d9ed-b6ca-49b0-92c6-239ab19343f3 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.scitotenv.2024.171199 |
container_title |
Science of The Total Environment |
container_volume |
921 |
container_start_page |
171199 |
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1796310255972384768 |