Development of a regional glycerol dialkyl glycerol tetraether (GDGT)-temperature calibration for Antarctic and sub-Antarctic lakes
A regional network of quantitative reconstructions of past climate variability is required to test climate models. In recent studies, temperature calibration models based on the relative abundances of sedimentary glycerol dialkyl glycerol tetraethers (GDGTs) have enabled past temperature reconstruct...
Published in: | Earth and Planetary Science Letters |
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Language: | English |
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Online Access: | https://biblio.ugent.be/publication/7244489 http://hdl.handle.net/1854/LU-7244489 https://doi.org/10.1016/j.epsl.2015.11.018 https://biblio.ugent.be/publication/7244489/file/7244506 |
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ftunivgent:oai:archive.ugent.be:7244489 2023-06-11T04:06:21+02:00 Development of a regional glycerol dialkyl glycerol tetraether (GDGT)-temperature calibration for Antarctic and sub-Antarctic lakes Foster, Louise C. Pearson, Emma J. Juggins, Steve Hodgson, Dominic A. Saunders, Krystyna M. Verleyen, Elie Roberts, Stephen J. 2016 application/pdf https://biblio.ugent.be/publication/7244489 http://hdl.handle.net/1854/LU-7244489 https://doi.org/10.1016/j.epsl.2015.11.018 https://biblio.ugent.be/publication/7244489/file/7244506 eng eng https://biblio.ugent.be/publication/7244489 http://hdl.handle.net/1854/LU-7244489 http://dx.doi.org/10.1016/j.epsl.2015.11.018 https://biblio.ugent.be/publication/7244489/file/7244506 Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) info:eu-repo/semantics/openAccess EARTH AND PLANETARY SCIENCE LETTERS ISSN: 0012-821X ISSN: 1385-013X Earth and Environmental Sciences palaeoclimate temperature reconstruction GDGTs Southern Hemisphere Antarctic palaeolimnology CRENARCHAEOTAL MEMBRANE-LIPIDS GDGT-BASED PROXIES VI ICE SHELF HOLOCENE CLIMATE AFRICAN LAKE TEMPERATURE VARIABILITY PALEOTEMPERATURE PROXY ENVIRONMENTAL CONTROLS WATER TEMPERATURES EAST ANTARCTICA journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftunivgent https://doi.org/10.1016/j.epsl.2015.11.018 2023-05-10T22:31:04Z A regional network of quantitative reconstructions of past climate variability is required to test climate models. In recent studies, temperature calibration models based on the relative abundances of sedimentary glycerol dialkyl glycerol tetraethers (GDGTs) have enabled past temperature reconstructions in both marine and terrestrial environments. Nevertheless, to date these methods have not been widely applied in high latitude environments due to poor performance of the GDGT–temperature calibrations at lower temperatures. To address this we studied 32 lakes from Antarctica, the sub-Antarctic Islands and Southern Chile to: 1) quantify their GDGT composition and investigate the environmental controls on GDGT composition; and 2) develop a GDGT–temperature calibration model for inferring past temperatures from Antarctic and sub-Antarctic lakes. GDGTs were found in all 32 lakes studied and in 31 lakes branched GDGTs (brGDGTs) were the dominant compounds. Statistical analyses of brGDGT composition in relation to temperature, pH, conductivity and water depth showed that the composition of brGDGTs is strongly correlated with mean summer air temperature (MSAT). This enabled the development of the first regional brGDGT–temperature calibration for use in Antarctic and sub-Antarctic lakes using four brGDGT compounds (GDGT-Ib, GDGT-II, GDGT-III and GDGT-IIIb). A key discovery was that GDGT-IIIb is of particular importance in cold lacustrine environments. The addition of this compound significantly improved the model's performance from , RMSEP-LOO (leave-one-out) = 2.23 °C, RMSEP-H (h-block) = 2.37 °C when applying the re-calibrated global GDGT–temperature calibration to our Antarctic dataset to , RMSEP-LOO = 1.68 °C, RMSEP-H = 1.65 °C for our new Antarctic calibration. This shows that Antarctic and sub-Antarctic, and possibly other high latitude, palaeotemperature reconstructions should be based on a regional GDGT–temperature calibration where specific compounds can be identified and included to improve model performance. ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Shelf Ghent University Academic Bibliography Antarctic East Antarctica Earth and Planetary Science Letters 433 370 379 |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Earth and Environmental Sciences palaeoclimate temperature reconstruction GDGTs Southern Hemisphere Antarctic palaeolimnology CRENARCHAEOTAL MEMBRANE-LIPIDS GDGT-BASED PROXIES VI ICE SHELF HOLOCENE CLIMATE AFRICAN LAKE TEMPERATURE VARIABILITY PALEOTEMPERATURE PROXY ENVIRONMENTAL CONTROLS WATER TEMPERATURES EAST ANTARCTICA |
spellingShingle |
Earth and Environmental Sciences palaeoclimate temperature reconstruction GDGTs Southern Hemisphere Antarctic palaeolimnology CRENARCHAEOTAL MEMBRANE-LIPIDS GDGT-BASED PROXIES VI ICE SHELF HOLOCENE CLIMATE AFRICAN LAKE TEMPERATURE VARIABILITY PALEOTEMPERATURE PROXY ENVIRONMENTAL CONTROLS WATER TEMPERATURES EAST ANTARCTICA Foster, Louise C. Pearson, Emma J. Juggins, Steve Hodgson, Dominic A. Saunders, Krystyna M. Verleyen, Elie Roberts, Stephen J. Development of a regional glycerol dialkyl glycerol tetraether (GDGT)-temperature calibration for Antarctic and sub-Antarctic lakes |
topic_facet |
Earth and Environmental Sciences palaeoclimate temperature reconstruction GDGTs Southern Hemisphere Antarctic palaeolimnology CRENARCHAEOTAL MEMBRANE-LIPIDS GDGT-BASED PROXIES VI ICE SHELF HOLOCENE CLIMATE AFRICAN LAKE TEMPERATURE VARIABILITY PALEOTEMPERATURE PROXY ENVIRONMENTAL CONTROLS WATER TEMPERATURES EAST ANTARCTICA |
description |
A regional network of quantitative reconstructions of past climate variability is required to test climate models. In recent studies, temperature calibration models based on the relative abundances of sedimentary glycerol dialkyl glycerol tetraethers (GDGTs) have enabled past temperature reconstructions in both marine and terrestrial environments. Nevertheless, to date these methods have not been widely applied in high latitude environments due to poor performance of the GDGT–temperature calibrations at lower temperatures. To address this we studied 32 lakes from Antarctica, the sub-Antarctic Islands and Southern Chile to: 1) quantify their GDGT composition and investigate the environmental controls on GDGT composition; and 2) develop a GDGT–temperature calibration model for inferring past temperatures from Antarctic and sub-Antarctic lakes. GDGTs were found in all 32 lakes studied and in 31 lakes branched GDGTs (brGDGTs) were the dominant compounds. Statistical analyses of brGDGT composition in relation to temperature, pH, conductivity and water depth showed that the composition of brGDGTs is strongly correlated with mean summer air temperature (MSAT). This enabled the development of the first regional brGDGT–temperature calibration for use in Antarctic and sub-Antarctic lakes using four brGDGT compounds (GDGT-Ib, GDGT-II, GDGT-III and GDGT-IIIb). A key discovery was that GDGT-IIIb is of particular importance in cold lacustrine environments. The addition of this compound significantly improved the model's performance from , RMSEP-LOO (leave-one-out) = 2.23 °C, RMSEP-H (h-block) = 2.37 °C when applying the re-calibrated global GDGT–temperature calibration to our Antarctic dataset to , RMSEP-LOO = 1.68 °C, RMSEP-H = 1.65 °C for our new Antarctic calibration. This shows that Antarctic and sub-Antarctic, and possibly other high latitude, palaeotemperature reconstructions should be based on a regional GDGT–temperature calibration where specific compounds can be identified and included to improve model performance. ... |
format |
Article in Journal/Newspaper |
author |
Foster, Louise C. Pearson, Emma J. Juggins, Steve Hodgson, Dominic A. Saunders, Krystyna M. Verleyen, Elie Roberts, Stephen J. |
author_facet |
Foster, Louise C. Pearson, Emma J. Juggins, Steve Hodgson, Dominic A. Saunders, Krystyna M. Verleyen, Elie Roberts, Stephen J. |
author_sort |
Foster, Louise C. |
title |
Development of a regional glycerol dialkyl glycerol tetraether (GDGT)-temperature calibration for Antarctic and sub-Antarctic lakes |
title_short |
Development of a regional glycerol dialkyl glycerol tetraether (GDGT)-temperature calibration for Antarctic and sub-Antarctic lakes |
title_full |
Development of a regional glycerol dialkyl glycerol tetraether (GDGT)-temperature calibration for Antarctic and sub-Antarctic lakes |
title_fullStr |
Development of a regional glycerol dialkyl glycerol tetraether (GDGT)-temperature calibration for Antarctic and sub-Antarctic lakes |
title_full_unstemmed |
Development of a regional glycerol dialkyl glycerol tetraether (GDGT)-temperature calibration for Antarctic and sub-Antarctic lakes |
title_sort |
development of a regional glycerol dialkyl glycerol tetraether (gdgt)-temperature calibration for antarctic and sub-antarctic lakes |
publishDate |
2016 |
url |
https://biblio.ugent.be/publication/7244489 http://hdl.handle.net/1854/LU-7244489 https://doi.org/10.1016/j.epsl.2015.11.018 https://biblio.ugent.be/publication/7244489/file/7244506 |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf |
op_source |
EARTH AND PLANETARY SCIENCE LETTERS ISSN: 0012-821X ISSN: 1385-013X |
op_relation |
https://biblio.ugent.be/publication/7244489 http://hdl.handle.net/1854/LU-7244489 http://dx.doi.org/10.1016/j.epsl.2015.11.018 https://biblio.ugent.be/publication/7244489/file/7244506 |
op_rights |
Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2015.11.018 |
container_title |
Earth and Planetary Science Letters |
container_volume |
433 |
container_start_page |
370 |
op_container_end_page |
379 |
_version_ |
1768378251021910016 |