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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European Geosciences Union
2022
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Online Access: | http://nora.nerc.ac.uk/id/eprint/532335/ https://nora.nerc.ac.uk/id/eprint/532335/1/cp-18-1831-2022.pdf https://cp.copernicus.org/articles/18/1831/2022/ |
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ftnerc:oai:nora.nerc.ac.uk:532335 2023-05-15T13:41:46+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 Doyle, Emily Schmidt, Axel Humby, Jack D. Rowell, Isobel F. Nehrbass-Ahles, Christoph Thomas, Elizabeth R. Mulvaney, Robert Wolff, Eric W. 2022-08-10 text http://nora.nerc.ac.uk/id/eprint/532335/ https://nora.nerc.ac.uk/id/eprint/532335/1/cp-18-1831-2022.pdf https://cp.copernicus.org/articles/18/1831/2022/ en eng European Geosciences Union https://nora.nerc.ac.uk/id/eprint/532335/1/cp-18-1831-2022.pdf Hoffmann, Helene M.; Grieman, Mackenzie M.; King, Amy C.F. orcid:0000-0002-1285-7568 Epifanio, Jenna A.; Martin, Kaden; Vladimirova, Diana; Pryer, Helena; Doyle, Emily; Schmidt, Axel; Humby, Jack D. orcid:0000-0003-0526-2766 Rowell, Isobel F.; Nehrbass-Ahles, Christoph; Thomas, Elizabeth R. orcid:0000-0002-3010-6493 Mulvaney, Robert orcid:0000-0002-5372-8148 Wolff, Eric W. 2022 The ST22 chronology for the Skytrain Ice Rise ice core – Part 1: A stratigraphic chronology of the last 2000 years. Climate of the Past, 18. 1831-1847. https://doi.org/10.5194/cp-18-1831-2022 <https://doi.org/10.5194/cp-18-1831-2022> cc_by_4 CC-BY Publication - Article PeerReviewed 2022 ftnerc https://doi.org/10.5194/cp-18-1831-2022 2023-02-04T19:53:07Z 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 Natural Environment Research Council: NERC Open Research Archive Antarctic West Antarctica West Antarctic Ice Sheet Skytrain Ice Rise ENVELOPE(-78.333,-78.333,-79.583,-79.583) Climate of the Past 18 8 1831 1847 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
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 Doyle, Emily Schmidt, Axel Humby, Jack D. Rowell, Isobel F. Nehrbass-Ahles, Christoph Thomas, Elizabeth R. Mulvaney, Robert Wolff, Eric W. |
spellingShingle |
Hoffmann, Helene M. Grieman, Mackenzie M. King, Amy C.F. Epifanio, Jenna A. Martin, Kaden Vladimirova, Diana Pryer, Helena 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 |
author_facet |
Hoffmann, Helene M. Grieman, Mackenzie M. King, Amy C.F. Epifanio, Jenna A. Martin, Kaden Vladimirova, Diana Pryer, Helena 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 |
European Geosciences Union |
publishDate |
2022 |
url |
http://nora.nerc.ac.uk/id/eprint/532335/ https://nora.nerc.ac.uk/id/eprint/532335/1/cp-18-1831-2022.pdf https://cp.copernicus.org/articles/18/1831/2022/ |
long_lat |
ENVELOPE(-78.333,-78.333,-79.583,-79.583) |
geographic |
Antarctic West Antarctica West Antarctic Ice Sheet Skytrain Ice Rise |
geographic_facet |
Antarctic West Antarctica West Antarctic Ice Sheet Skytrain Ice Rise |
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 |
https://nora.nerc.ac.uk/id/eprint/532335/1/cp-18-1831-2022.pdf Hoffmann, Helene M.; Grieman, Mackenzie M.; King, Amy C.F. orcid:0000-0002-1285-7568 Epifanio, Jenna A.; Martin, Kaden; Vladimirova, Diana; Pryer, Helena; Doyle, Emily; Schmidt, Axel; Humby, Jack D. orcid:0000-0003-0526-2766 Rowell, Isobel F.; Nehrbass-Ahles, Christoph; Thomas, Elizabeth R. orcid:0000-0002-3010-6493 Mulvaney, Robert orcid:0000-0002-5372-8148 Wolff, Eric W. 2022 The ST22 chronology for the Skytrain Ice Rise ice core – Part 1: A stratigraphic chronology of the last 2000 years. Climate of the Past, 18. 1831-1847. https://doi.org/10.5194/cp-18-1831-2022 <https://doi.org/10.5194/cp-18-1831-2022> |
op_rights |
cc_by_4 |
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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1766157837837271040 |