Reconstruction of warm season temperatures in central Europe during the past 60,000 years from lacustrine GDGTs
Millennial-scale climate variations during the last glacial period, such as Dansgaard–Oeschger (D/O) cycles and Heinrich events, have been extensively studied using ice core and marine proxy records. However, there is a limited understanding of the magnitude of these temperature fluctuations in cont...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/644021 2023-12-31T10:07:57+01:00 Reconstruction of warm season temperatures in central Europe during the past 60,000 years from lacustrine GDGTs Zander, Paul D. Böhl, Daniel Sirocko, Frank Auderset, Alexandra id_orcid:0 000-0002-6316-4980 Haug, Gerald Martínez-García, Alfredo 2023-09-26 application/application/pdf https://hdl.handle.net/20.500.11850/644021 https://doi.org/10.3929/ethz-b-000644021 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-2023-1960 http://hdl.handle.net/20.500.11850/644021 doi:10.3929/ethz-b-000644021 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International EGUsphere info:eu-repo/semantics/workingPaper 2023 ftethz https://doi.org/20.500.11850/64402110.3929/ethz-b-00064402110.5194/egusphere-2023-1960 2023-12-04T00:53:06Z Millennial-scale climate variations during the last glacial period, such as Dansgaard–Oeschger (D/O) cycles and Heinrich events, have been extensively studied using ice core and marine proxy records. However, there is a limited understanding of the magnitude of these temperature fluctuations in continental regions, and questions remain about the seasonal signal of these climate events. This study presents a 60,000-year long temperature reconstruction based on branched glycerol dialkyl glycerol tetraethers (brGDGTs) extracted from lake sediments from the Eifel volcanic field, Germany. brGDGTs are bacterial membrane lipids that are known to have strong relationship with temperature, making them suitable for temperature reconstructions. We test several temperature calibration models on modern samples taken from soils and multiple maar lakes. We find a bias associated with water depth and anoxic conditions that can be corrected for by accounting for a brGDGT isomer that is only produced in anoxic conditions. The corrected temperature reconstruction correlates with proxy and model temperature record spanning the same time period, validating the calibration model. However, millennial-scale variability is significantly dampened in the brGDGT record, and in contrast to other northern hemisphere climate records, during several Heinrich stadials, temperatures actually increase. We demonstrate that these apparent discrepancies can be explained by the unique seasonal response of the brGDGT paleothermometer to temperatures of months above freezing (TMAF). Our data support the view that warm season temperatures in Europe varied minimally during the last glacial period, and that abrupt millennial-scale events were defined by colder, longer winters. Our continuous high-resolution temperature reconstruction provides important information about the magnitude of seasonal climate variability during the last glacial period that can be used to test climate models and inform studies of paleoecological change. Report ice core ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
description |
Millennial-scale climate variations during the last glacial period, such as Dansgaard–Oeschger (D/O) cycles and Heinrich events, have been extensively studied using ice core and marine proxy records. However, there is a limited understanding of the magnitude of these temperature fluctuations in continental regions, and questions remain about the seasonal signal of these climate events. This study presents a 60,000-year long temperature reconstruction based on branched glycerol dialkyl glycerol tetraethers (brGDGTs) extracted from lake sediments from the Eifel volcanic field, Germany. brGDGTs are bacterial membrane lipids that are known to have strong relationship with temperature, making them suitable for temperature reconstructions. We test several temperature calibration models on modern samples taken from soils and multiple maar lakes. We find a bias associated with water depth and anoxic conditions that can be corrected for by accounting for a brGDGT isomer that is only produced in anoxic conditions. The corrected temperature reconstruction correlates with proxy and model temperature record spanning the same time period, validating the calibration model. However, millennial-scale variability is significantly dampened in the brGDGT record, and in contrast to other northern hemisphere climate records, during several Heinrich stadials, temperatures actually increase. We demonstrate that these apparent discrepancies can be explained by the unique seasonal response of the brGDGT paleothermometer to temperatures of months above freezing (TMAF). Our data support the view that warm season temperatures in Europe varied minimally during the last glacial period, and that abrupt millennial-scale events were defined by colder, longer winters. Our continuous high-resolution temperature reconstruction provides important information about the magnitude of seasonal climate variability during the last glacial period that can be used to test climate models and inform studies of paleoecological change. |
format |
Report |
author |
Zander, Paul D. Böhl, Daniel Sirocko, Frank Auderset, Alexandra id_orcid:0 000-0002-6316-4980 Haug, Gerald Martínez-García, Alfredo |
spellingShingle |
Zander, Paul D. Böhl, Daniel Sirocko, Frank Auderset, Alexandra id_orcid:0 000-0002-6316-4980 Haug, Gerald Martínez-García, Alfredo Reconstruction of warm season temperatures in central Europe during the past 60,000 years from lacustrine GDGTs |
author_facet |
Zander, Paul D. Böhl, Daniel Sirocko, Frank Auderset, Alexandra id_orcid:0 000-0002-6316-4980 Haug, Gerald Martínez-García, Alfredo |
author_sort |
Zander, Paul D. |
title |
Reconstruction of warm season temperatures in central Europe during the past 60,000 years from lacustrine GDGTs |
title_short |
Reconstruction of warm season temperatures in central Europe during the past 60,000 years from lacustrine GDGTs |
title_full |
Reconstruction of warm season temperatures in central Europe during the past 60,000 years from lacustrine GDGTs |
title_fullStr |
Reconstruction of warm season temperatures in central Europe during the past 60,000 years from lacustrine GDGTs |
title_full_unstemmed |
Reconstruction of warm season temperatures in central Europe during the past 60,000 years from lacustrine GDGTs |
title_sort |
reconstruction of warm season temperatures in central europe during the past 60,000 years from lacustrine gdgts |
publisher |
Copernicus |
publishDate |
2023 |
url |
https://hdl.handle.net/20.500.11850/644021 https://doi.org/10.3929/ethz-b-000644021 |
genre |
ice core |
genre_facet |
ice core |
op_source |
EGUsphere |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-2023-1960 http://hdl.handle.net/20.500.11850/644021 doi:10.3929/ethz-b-000644021 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/64402110.3929/ethz-b-00064402110.5194/egusphere-2023-1960 |
_version_ |
1786840500998766592 |