The ST22 chronology for the Skytrain Ice Rise ice core – Part 1: A stratigraphic chronology of the last 2000 years

A new ice core was drilled in West Antarctica on Skytrain Ice Rise in field season 2018/2019. This 651 m ice core is one of the main targets of the WACSWAIN (WArm Climate Stability of the West Antarctic ice sheet in the last INterglacial) project. A present-day accumulation rate of 13.5 cm w.e. yr−1...

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Published in:Climate of the Past
Main Authors: Hoffmann, Helene M., Grieman, Mackenzie M., King, Amy C. F., Epifanio, Jenna A., Martin, Kaden, Vladimirova, Diana, Pryer, Helena V., Doyle, Emily, Schmidt, Axel, Humby, Jack D., Rowell, Isobel F., Nehrbass-Ahles, Christoph, Thomas, Elizabeth R., Mulvaney, Robert, Wolff, Eric W.
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2022
Subjects:
Online Access:https://doi.org/10.5194/cp-18-1831-2022
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spelling ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00062256 2023-05-15T13:49:21+02:00 The ST22 chronology for the Skytrain Ice Rise ice core – Part 1: A stratigraphic chronology of the last 2000 years Hoffmann, Helene M. Grieman, Mackenzie M. King, Amy C. F. Epifanio, Jenna A. Martin, Kaden Vladimirova, Diana Pryer, Helena V. Doyle, Emily Schmidt, Axel Humby, Jack D. Rowell, Isobel F. Nehrbass-Ahles, Christoph Thomas, Elizabeth R. Mulvaney, Robert Wolff, Eric W. 2022-08 electronic https://doi.org/10.5194/cp-18-1831-2022 https://noa.gwlb.de/receive/cop_mods_00062256 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061575/cp-18-1831-2022.pdf https://cp.copernicus.org/articles/18/1831/2022/cp-18-1831-2022.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-18-1831-2022 https://noa.gwlb.de/receive/cop_mods_00062256 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061575/cp-18-1831-2022.pdf https://cp.copernicus.org/articles/18/1831/2022/cp-18-1831-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/cp-18-1831-2022 2022-08-14T23:11:52Z A new ice core was drilled in West Antarctica on Skytrain Ice Rise in field season 2018/2019. This 651 m ice core is one of the main targets of the WACSWAIN (WArm Climate Stability of the West Antarctic ice sheet in the last INterglacial) project. A present-day accumulation rate of 13.5 cm w.e. yr−1 was derived. Although the project mainly aims to investigate the last interglacial (115–130 ka), a robust chronology period covering the recent past is needed to constrain the age models for the deepest ice. Additionally, this time period is important for understanding current climatic changes in the West Antarctic region. Here, we present a stratigraphic chronology for the top 184.14 m of the Skytrain ice core based on absolute age tie points interpolated using annual layer counting encompassing the last 2000 years of climate history. Together with a model-based depth–age relationship of the deeper part of the ice core, this will form the ST22 chronology. The chemical composition, dust content, liquid conductivity, water isotope concentration and methane content of the whole core was analysed via continuous flow analysis (CFA) at the British Antarctic Survey. Annual layer counting was performed by manual counting of seasonal variations in mainly the sodium and calcium records. This counted chronology was informed and anchored by absolute age tie points, namely, the tritium peak (1965 CE) and six volcanic eruptions. Methane concentration variations were used to further constrain the counting error. A minimal error of ±1 year at the tie points was derived, accumulating to ± 5 %–10 % of the age in the unconstrained sections between tie points. This level of accuracy enables data interpretation on at least decadal timescales and provides a solid base for the dating of deeper ice, which is the second part of the chronology. Article in Journal/Newspaper Antarc* Antarctic Antarctica British Antarctic Survey ice core Ice Sheet West Antarctica Niedersächsisches Online-Archiv NOA Antarctic Skytrain Ice Rise ENVELOPE(-78.333,-78.333,-79.583,-79.583) West Antarctic Ice Sheet West Antarctica Climate of the Past 18 8 1831 1847
institution Open Polar
collection Niedersächsisches Online-Archiv NOA
op_collection_id ftnonlinearchiv
language English
topic article
Verlagsveröffentlichung
spellingShingle article
Verlagsveröffentlichung
Hoffmann, Helene M.
Grieman, Mackenzie M.
King, Amy C. F.
Epifanio, Jenna A.
Martin, Kaden
Vladimirova, Diana
Pryer, Helena V.
Doyle, Emily
Schmidt, Axel
Humby, Jack D.
Rowell, Isobel F.
Nehrbass-Ahles, Christoph
Thomas, Elizabeth R.
Mulvaney, Robert
Wolff, Eric W.
The ST22 chronology for the Skytrain Ice Rise ice core – Part 1: A stratigraphic chronology of the last 2000 years
topic_facet article
Verlagsveröffentlichung
description A new ice core was drilled in West Antarctica on Skytrain Ice Rise in field season 2018/2019. This 651 m ice core is one of the main targets of the WACSWAIN (WArm Climate Stability of the West Antarctic ice sheet in the last INterglacial) project. A present-day accumulation rate of 13.5 cm w.e. yr−1 was derived. Although the project mainly aims to investigate the last interglacial (115–130 ka), a robust chronology period covering the recent past is needed to constrain the age models for the deepest ice. Additionally, this time period is important for understanding current climatic changes in the West Antarctic region. Here, we present a stratigraphic chronology for the top 184.14 m of the Skytrain ice core based on absolute age tie points interpolated using annual layer counting encompassing the last 2000 years of climate history. Together with a model-based depth–age relationship of the deeper part of the ice core, this will form the ST22 chronology. The chemical composition, dust content, liquid conductivity, water isotope concentration and methane content of the whole core was analysed via continuous flow analysis (CFA) at the British Antarctic Survey. Annual layer counting was performed by manual counting of seasonal variations in mainly the sodium and calcium records. This counted chronology was informed and anchored by absolute age tie points, namely, the tritium peak (1965 CE) and six volcanic eruptions. Methane concentration variations were used to further constrain the counting error. A minimal error of ±1 year at the tie points was derived, accumulating to ± 5 %–10 % of the age in the unconstrained sections between tie points. This level of accuracy enables data interpretation on at least decadal timescales and provides a solid base for the dating of deeper ice, which is the second part of the chronology.
format Article in Journal/Newspaper
author Hoffmann, Helene M.
Grieman, Mackenzie M.
King, Amy C. F.
Epifanio, Jenna A.
Martin, Kaden
Vladimirova, Diana
Pryer, Helena V.
Doyle, Emily
Schmidt, Axel
Humby, Jack D.
Rowell, Isobel F.
Nehrbass-Ahles, Christoph
Thomas, Elizabeth R.
Mulvaney, Robert
Wolff, Eric W.
author_facet Hoffmann, Helene M.
Grieman, Mackenzie M.
King, Amy C. F.
Epifanio, Jenna A.
Martin, Kaden
Vladimirova, Diana
Pryer, Helena V.
Doyle, Emily
Schmidt, Axel
Humby, Jack D.
Rowell, Isobel F.
Nehrbass-Ahles, Christoph
Thomas, Elizabeth R.
Mulvaney, Robert
Wolff, Eric W.
author_sort Hoffmann, Helene M.
title The ST22 chronology for the Skytrain Ice Rise ice core – Part 1: A stratigraphic chronology of the last 2000 years
title_short The ST22 chronology for the Skytrain Ice Rise ice core – Part 1: A stratigraphic chronology of the last 2000 years
title_full The ST22 chronology for the Skytrain Ice Rise ice core – Part 1: A stratigraphic chronology of the last 2000 years
title_fullStr The ST22 chronology for the Skytrain Ice Rise ice core – Part 1: A stratigraphic chronology of the last 2000 years
title_full_unstemmed The ST22 chronology for the Skytrain Ice Rise ice core – Part 1: A stratigraphic chronology of the last 2000 years
title_sort st22 chronology for the skytrain ice rise ice core – part 1: a stratigraphic chronology of the last 2000 years
publisher Copernicus Publications
publishDate 2022
url https://doi.org/10.5194/cp-18-1831-2022
https://noa.gwlb.de/receive/cop_mods_00062256
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061575/cp-18-1831-2022.pdf
https://cp.copernicus.org/articles/18/1831/2022/cp-18-1831-2022.pdf
long_lat ENVELOPE(-78.333,-78.333,-79.583,-79.583)
geographic Antarctic
Skytrain Ice Rise
West Antarctic Ice Sheet
West Antarctica
geographic_facet Antarctic
Skytrain Ice Rise
West Antarctic Ice Sheet
West Antarctica
genre Antarc*
Antarctic
Antarctica
British Antarctic Survey
ice core
Ice Sheet
West Antarctica
genre_facet Antarc*
Antarctic
Antarctica
British Antarctic Survey
ice core
Ice Sheet
West Antarctica
op_relation Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332
https://doi.org/10.5194/cp-18-1831-2022
https://noa.gwlb.de/receive/cop_mods_00062256
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00061575/cp-18-1831-2022.pdf
https://cp.copernicus.org/articles/18/1831/2022/cp-18-1831-2022.pdf
op_rights https://creativecommons.org/licenses/by/4.0/
uneingeschränkt
info:eu-repo/semantics/openAccess
op_rightsnorm CC-BY
op_doi https://doi.org/10.5194/cp-18-1831-2022
container_title Climate of the Past
container_volume 18
container_issue 8
container_start_page 1831
op_container_end_page 1847
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