(In)coherent multiproxy signals in marine sediments: Implications for high-resolution paleoclimate reconstruction
Accurate chronologies are the backbone of paleoclimate research, yet for marine sedimentary records the same age model is often applied to co-eval components that may have experienced different pre-depositional histories, leading to aliasing in corresponding proxy signals. Here we demonstrate 14C ag...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/334985 2023-05-15T18:00:55+02:00 (In)coherent multiproxy signals in marine sediments: Implications for high-resolution paleoclimate reconstruction Ausín, Blanca Magill, Clayton Haghipour, Negar Fernandez, Alvaro Wacker, Lukas Hodell, David Baumann, Karl-Heinz Eglinton, Timothy I. 2019-06-01 application/application/pdf https://hdl.handle.net/20.500.11850/334985 https://doi.org/10.3929/ethz-b-000334985 en eng Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2019.03.003 info:eu-repo/semantics/altIdentifier/wos/000466251400004 info:eu-repo/grantAgreement/SNF/Projekte MINT/175823 http://hdl.handle.net/20.500.11850/334985 doi:10.3929/ethz-b-000334985 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International CC-BY-NC-ND Earth and Planetary Science Letters, 515 radiocarbon chronostratigraphy age offsets proxy bias Iberian margin age structure info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftethz https://doi.org/20.500.11850/334985 https://doi.org/10.3929/ethz-b-000334985 https://doi.org/10.1016/j.epsl.2019.03.003 2023-02-13T00:47:07Z Accurate chronologies are the backbone of paleoclimate research, yet for marine sedimentary records the same age model is often applied to co-eval components that may have experienced different pre-depositional histories, leading to aliasing in corresponding proxy signals. Here we demonstrate 14C age discrepancies among several proxy carriers and use them to highlight spatio-temporal disparities among different components of the sediment. Total organic carbon (TOC), alkenones, and alkanoic (fatty) acids have older ages than co-occurring planktonic foraminifera in corresponding depth intervals of a sediment core retrieved from the so-called ‘Shackleton Sites’ on the southwest Iberian margin off Portugal. Temporal differences are explained by the addition of pre-aged material that is transported to the site by lateral advection, rivers or wind. We then modeled the age structure and relative abundance of the different pools that might have contributed to the older ages of TOC and alkenones. Results suggest the addition of a moderate (15-20%) proportion of very old allochthonous material (18,500-49,900 yr). This information was used to deconvolve the alkenone-derived sea surface temperature (SST) record and assess the impact of allochthonous inputs on paleoclimate signals. ISSN:0012-821X ISSN:1385-013X Article in Journal/Newspaper Planktonic foraminifera ETH Zürich Research Collection Shackleton |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
radiocarbon chronostratigraphy age offsets proxy bias Iberian margin age structure |
spellingShingle |
radiocarbon chronostratigraphy age offsets proxy bias Iberian margin age structure Ausín, Blanca Magill, Clayton Haghipour, Negar Fernandez, Alvaro Wacker, Lukas Hodell, David Baumann, Karl-Heinz Eglinton, Timothy I. (In)coherent multiproxy signals in marine sediments: Implications for high-resolution paleoclimate reconstruction |
topic_facet |
radiocarbon chronostratigraphy age offsets proxy bias Iberian margin age structure |
description |
Accurate chronologies are the backbone of paleoclimate research, yet for marine sedimentary records the same age model is often applied to co-eval components that may have experienced different pre-depositional histories, leading to aliasing in corresponding proxy signals. Here we demonstrate 14C age discrepancies among several proxy carriers and use them to highlight spatio-temporal disparities among different components of the sediment. Total organic carbon (TOC), alkenones, and alkanoic (fatty) acids have older ages than co-occurring planktonic foraminifera in corresponding depth intervals of a sediment core retrieved from the so-called ‘Shackleton Sites’ on the southwest Iberian margin off Portugal. Temporal differences are explained by the addition of pre-aged material that is transported to the site by lateral advection, rivers or wind. We then modeled the age structure and relative abundance of the different pools that might have contributed to the older ages of TOC and alkenones. Results suggest the addition of a moderate (15-20%) proportion of very old allochthonous material (18,500-49,900 yr). This information was used to deconvolve the alkenone-derived sea surface temperature (SST) record and assess the impact of allochthonous inputs on paleoclimate signals. ISSN:0012-821X ISSN:1385-013X |
format |
Article in Journal/Newspaper |
author |
Ausín, Blanca Magill, Clayton Haghipour, Negar Fernandez, Alvaro Wacker, Lukas Hodell, David Baumann, Karl-Heinz Eglinton, Timothy I. |
author_facet |
Ausín, Blanca Magill, Clayton Haghipour, Negar Fernandez, Alvaro Wacker, Lukas Hodell, David Baumann, Karl-Heinz Eglinton, Timothy I. |
author_sort |
Ausín, Blanca |
title |
(In)coherent multiproxy signals in marine sediments: Implications for high-resolution paleoclimate reconstruction |
title_short |
(In)coherent multiproxy signals in marine sediments: Implications for high-resolution paleoclimate reconstruction |
title_full |
(In)coherent multiproxy signals in marine sediments: Implications for high-resolution paleoclimate reconstruction |
title_fullStr |
(In)coherent multiproxy signals in marine sediments: Implications for high-resolution paleoclimate reconstruction |
title_full_unstemmed |
(In)coherent multiproxy signals in marine sediments: Implications for high-resolution paleoclimate reconstruction |
title_sort |
(in)coherent multiproxy signals in marine sediments: implications for high-resolution paleoclimate reconstruction |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://hdl.handle.net/20.500.11850/334985 https://doi.org/10.3929/ethz-b-000334985 |
geographic |
Shackleton |
geographic_facet |
Shackleton |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Earth and Planetary Science Letters, 515 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2019.03.003 info:eu-repo/semantics/altIdentifier/wos/000466251400004 info:eu-repo/grantAgreement/SNF/Projekte MINT/175823 http://hdl.handle.net/20.500.11850/334985 doi:10.3929/ethz-b-000334985 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/20.500.11850/334985 https://doi.org/10.3929/ethz-b-000334985 https://doi.org/10.1016/j.epsl.2019.03.003 |
_version_ |
1766170193629806592 |