A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes
Quantitative climate reconstructions are fundamental to understand long-term trends in natural climate variability and to test climate models used to predict future climate change. Recent advances in molecular geochemistry have led to calibrations using glycerol dialkyl glycerol tetraethers (GDGTs),...
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ftnerc:oai:nora.nerc.ac.uk:15815 2023-05-15T13:45:11+02:00 A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes Pearson, Emma J. Juggins, Steve Talbot, Helen M. Weckström, Jan Rosén, Peter Ryves, David B. Roberts, Stephen Schmidt, Roland 2011 http://nora.nerc.ac.uk/id/eprint/15815/ http://www.sciencedirect.com/science/journal/00167037 unknown Elsevier Pearson, Emma J.; Juggins, Steve; Talbot, Helen M.; Weckström, Jan; Rosén, Peter; Ryves, David B.; Roberts, Stephen orcid:0000-0003-3407-9127 Schmidt, Roland. 2011 A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes. Geochimica et Cosmochimica Acta, 75 (20). 6225-6238. https://doi.org/10.1016/j.gca.2011.07.042 <https://doi.org/10.1016/j.gca.2011.07.042> Meteorology and Climatology Publication - Article PeerReviewed 2011 ftnerc https://doi.org/10.1016/j.gca.2011.07.042 2023-02-04T19:30:09Z Quantitative climate reconstructions are fundamental to understand long-term trends in natural climate variability and to test climate models used to predict future climate change. Recent advances in molecular geochemistry have led to calibrations using glycerol dialkyl glycerol tetraethers (GDGTs), a group of temperature-sensitive membrane lipids found in Archaea and bacteria. GDGTs have been used to construct temperature indices for oceans (TEX86 index) and soils (MBT/CBT index). The aim of this study is to examine GDGT-temperature relationships and assess the potential of constructing a GDGT-based palaeo-thermometer for lakes. We examine GDGT-temperature relationships using core top sediments from 90 lakes across a north–south transect from the Scandinavian Arctic to Antarctica including sites from Finland, Sweden, Siberia, the UK, Austria, Turkey, Ethiopia, Uganda, Chile, South Georgia and the Antarctic Peninsula. We examine a suite of 15 GDGTs, including compounds used in the TEX86 and MBT/CBT indices and reflecting the broad range of GDGT inputs to small lake systems. GDGTs are present in varying proportions in all lakes examined. The TEX86 index is not applicable to our sites because of the large relative proportions of soil derived and methanogenic components. Similarly, the MBT/CBT index is also not applicable and predicts temperatures considerably lower than those measured. We examine relationships between individual GDGT compounds and temperature, pH, conductivity and water depth. Temperature accounts for a large and statistically independent fraction of variation in branched GDGT composition. We propose a GDGT-temperature regression model with high accuracy and precision (R2 = 0.88; RMSE = 2.0 °C; RMSEP = 2.1 °C) for use in lakes based on a subset of branched GDGT compounds and highlight the potential of this new method for reconstructing past temperatures using lake sediments. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Arctic Arctic Climate change Siberia Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Arctic The Antarctic Geochimica et Cosmochimica Acta 75 20 6225 6238 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Pearson, Emma J. Juggins, Steve Talbot, Helen M. Weckström, Jan Rosén, Peter Ryves, David B. Roberts, Stephen Schmidt, Roland A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes |
topic_facet |
Meteorology and Climatology |
description |
Quantitative climate reconstructions are fundamental to understand long-term trends in natural climate variability and to test climate models used to predict future climate change. Recent advances in molecular geochemistry have led to calibrations using glycerol dialkyl glycerol tetraethers (GDGTs), a group of temperature-sensitive membrane lipids found in Archaea and bacteria. GDGTs have been used to construct temperature indices for oceans (TEX86 index) and soils (MBT/CBT index). The aim of this study is to examine GDGT-temperature relationships and assess the potential of constructing a GDGT-based palaeo-thermometer for lakes. We examine GDGT-temperature relationships using core top sediments from 90 lakes across a north–south transect from the Scandinavian Arctic to Antarctica including sites from Finland, Sweden, Siberia, the UK, Austria, Turkey, Ethiopia, Uganda, Chile, South Georgia and the Antarctic Peninsula. We examine a suite of 15 GDGTs, including compounds used in the TEX86 and MBT/CBT indices and reflecting the broad range of GDGT inputs to small lake systems. GDGTs are present in varying proportions in all lakes examined. The TEX86 index is not applicable to our sites because of the large relative proportions of soil derived and methanogenic components. Similarly, the MBT/CBT index is also not applicable and predicts temperatures considerably lower than those measured. We examine relationships between individual GDGT compounds and temperature, pH, conductivity and water depth. Temperature accounts for a large and statistically independent fraction of variation in branched GDGT composition. We propose a GDGT-temperature regression model with high accuracy and precision (R2 = 0.88; RMSE = 2.0 °C; RMSEP = 2.1 °C) for use in lakes based on a subset of branched GDGT compounds and highlight the potential of this new method for reconstructing past temperatures using lake sediments. |
format |
Article in Journal/Newspaper |
author |
Pearson, Emma J. Juggins, Steve Talbot, Helen M. Weckström, Jan Rosén, Peter Ryves, David B. Roberts, Stephen Schmidt, Roland |
author_facet |
Pearson, Emma J. Juggins, Steve Talbot, Helen M. Weckström, Jan Rosén, Peter Ryves, David B. Roberts, Stephen Schmidt, Roland |
author_sort |
Pearson, Emma J. |
title |
A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes |
title_short |
A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes |
title_full |
A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes |
title_fullStr |
A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes |
title_full_unstemmed |
A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes |
title_sort |
lacustrine gdgt-temperature calibration from the scandinavian arctic to antarctic: renewed potential for the application of gdgt-paleothermometry in lakes |
publisher |
Elsevier |
publishDate |
2011 |
url |
http://nora.nerc.ac.uk/id/eprint/15815/ http://www.sciencedirect.com/science/journal/00167037 |
geographic |
Antarctic Antarctic Peninsula Arctic The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Arctic The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Arctic Arctic Climate change Siberia |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Arctic Arctic Climate change Siberia |
op_relation |
Pearson, Emma J.; Juggins, Steve; Talbot, Helen M.; Weckström, Jan; Rosén, Peter; Ryves, David B.; Roberts, Stephen orcid:0000-0003-3407-9127 Schmidt, Roland. 2011 A lacustrine GDGT-temperature calibration from the Scandinavian Arctic to Antarctic: Renewed potential for the application of GDGT-paleothermometry in lakes. Geochimica et Cosmochimica Acta, 75 (20). 6225-6238. https://doi.org/10.1016/j.gca.2011.07.042 <https://doi.org/10.1016/j.gca.2011.07.042> |
op_doi |
https://doi.org/10.1016/j.gca.2011.07.042 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
75 |
container_issue |
20 |
container_start_page |
6225 |
op_container_end_page |
6238 |
_version_ |
1766215971238838272 |