The ST22 chronology for the Skytrain Ice Rise ice core - Part 2 : An age model to the last interglacial and disturbed deep stratigraphy
We present an age model for the 651g€¯m deep ice core from Skytrain Ice Rise, situated inland of the Ronne Ice Shelf, Antarctica. The top 2000 years have previously been dated using age markers interpolated through annual layer counting. Below this, we align the Skytrain core to the AICC2012 age mod...
Published in: | Climate of the Past |
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Main Authors: | , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus GmbH
2023
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Online Access: | https://lup.lub.lu.se/record/59a39a59-1eb8-4f16-9f9a-a8ca52132889 https://doi.org/10.5194/cp-19-851-2023 |
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ftulundlup:oai:lup.lub.lu.se:59a39a59-1eb8-4f16-9f9a-a8ca52132889 2023-09-05T13:13:33+02:00 The ST22 chronology for the Skytrain Ice Rise ice core - Part 2 : An age model to the last interglacial and disturbed deep stratigraphy Mulvaney, Robert Wolff, Eric W. Grieman, Mackenzie M. Hoffmann, Helene H. Humby, Jack D. Nehrbass-Ahles, Christoph Rhodes, Rachael H. Rowell, Isobel F. Parrenin, Frédéric Schmidely, Loïc Fischer, Hubertus Stocker, Thomas F. Christl, Marcus Muscheler, Raimund Landais, Amaelle Prié, Frédéric 2023-04-27 https://lup.lub.lu.se/record/59a39a59-1eb8-4f16-9f9a-a8ca52132889 https://doi.org/10.5194/cp-19-851-2023 eng eng Copernicus GmbH https://lup.lub.lu.se/record/59a39a59-1eb8-4f16-9f9a-a8ca52132889 http://dx.doi.org/10.5194/cp-19-851-2023 scopus:85158077804 Climate of the Past; 19(4), pp 851-864 (2023) ISSN: 1814-9324 Climate Research contributiontojournal/article info:eu-repo/semantics/article text 2023 ftulundlup https://doi.org/10.5194/cp-19-851-2023 2023-08-16T22:28:39Z We present an age model for the 651g€¯m deep ice core from Skytrain Ice Rise, situated inland of the Ronne Ice Shelf, Antarctica. The top 2000 years have previously been dated using age markers interpolated through annual layer counting. Below this, we align the Skytrain core to the AICC2012 age model using tie points in the ice and air phase, and we apply the Paleochrono program to obtain the best fit to the tie points and glaciological constraints. In the gas phase, ties are made using methane and, in critical sections, δ18Oair; in the ice phase ties are through 10Be across the Laschamps event and through ice chemistry related to long-range dust transport and deposition. This strategy provides a good outcome to about 108g€¯ka (g1/4g€¯605g€¯m). Beyond that there are signs of flow disturbance, with a section of ice probably repeated. Nonetheless values of CH4 and δ18Oair confirm that part of the last interglacial (LIG), from about 117-126g€¯ka (617-627g€¯m), is present and in chronological order. Below this there are clear signs of stratigraphic disturbance, with rapid oscillation of values in both the ice and gas phase at the base of the LIG section, below 628g€¯m. Based on methane values, the warmest part of the LIG and the coldest part of the penultimate glacial are missing from our record. Ice below 631g€¯m appears to be of ageg€¯>g€¯150g€¯ka. Article in Journal/Newspaper Antarc* Antarctica ice core Ice Shelf Ronne Ice Shelf Lund University Publications (LUP) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Skytrain Ice Rise ENVELOPE(-78.333,-78.333,-79.583,-79.583) Climate of the Past 19 4 851 864 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Climate Research |
spellingShingle |
Climate Research Mulvaney, Robert Wolff, Eric W. Grieman, Mackenzie M. Hoffmann, Helene H. Humby, Jack D. Nehrbass-Ahles, Christoph Rhodes, Rachael H. Rowell, Isobel F. Parrenin, Frédéric Schmidely, Loïc Fischer, Hubertus Stocker, Thomas F. Christl, Marcus Muscheler, Raimund Landais, Amaelle Prié, Frédéric The ST22 chronology for the Skytrain Ice Rise ice core - Part 2 : An age model to the last interglacial and disturbed deep stratigraphy |
topic_facet |
Climate Research |
description |
We present an age model for the 651g€¯m deep ice core from Skytrain Ice Rise, situated inland of the Ronne Ice Shelf, Antarctica. The top 2000 years have previously been dated using age markers interpolated through annual layer counting. Below this, we align the Skytrain core to the AICC2012 age model using tie points in the ice and air phase, and we apply the Paleochrono program to obtain the best fit to the tie points and glaciological constraints. In the gas phase, ties are made using methane and, in critical sections, δ18Oair; in the ice phase ties are through 10Be across the Laschamps event and through ice chemistry related to long-range dust transport and deposition. This strategy provides a good outcome to about 108g€¯ka (g1/4g€¯605g€¯m). Beyond that there are signs of flow disturbance, with a section of ice probably repeated. Nonetheless values of CH4 and δ18Oair confirm that part of the last interglacial (LIG), from about 117-126g€¯ka (617-627g€¯m), is present and in chronological order. Below this there are clear signs of stratigraphic disturbance, with rapid oscillation of values in both the ice and gas phase at the base of the LIG section, below 628g€¯m. Based on methane values, the warmest part of the LIG and the coldest part of the penultimate glacial are missing from our record. Ice below 631g€¯m appears to be of ageg€¯>g€¯150g€¯ka. |
format |
Article in Journal/Newspaper |
author |
Mulvaney, Robert Wolff, Eric W. Grieman, Mackenzie M. Hoffmann, Helene H. Humby, Jack D. Nehrbass-Ahles, Christoph Rhodes, Rachael H. Rowell, Isobel F. Parrenin, Frédéric Schmidely, Loïc Fischer, Hubertus Stocker, Thomas F. Christl, Marcus Muscheler, Raimund Landais, Amaelle Prié, Frédéric |
author_facet |
Mulvaney, Robert Wolff, Eric W. Grieman, Mackenzie M. Hoffmann, Helene H. Humby, Jack D. Nehrbass-Ahles, Christoph Rhodes, Rachael H. Rowell, Isobel F. Parrenin, Frédéric Schmidely, Loïc Fischer, Hubertus Stocker, Thomas F. Christl, Marcus Muscheler, Raimund Landais, Amaelle Prié, Frédéric |
author_sort |
Mulvaney, Robert |
title |
The ST22 chronology for the Skytrain Ice Rise ice core - Part 2 : An age model to the last interglacial and disturbed deep stratigraphy |
title_short |
The ST22 chronology for the Skytrain Ice Rise ice core - Part 2 : An age model to the last interglacial and disturbed deep stratigraphy |
title_full |
The ST22 chronology for the Skytrain Ice Rise ice core - Part 2 : An age model to the last interglacial and disturbed deep stratigraphy |
title_fullStr |
The ST22 chronology for the Skytrain Ice Rise ice core - Part 2 : An age model to the last interglacial and disturbed deep stratigraphy |
title_full_unstemmed |
The ST22 chronology for the Skytrain Ice Rise ice core - Part 2 : An age model to the last interglacial and disturbed deep stratigraphy |
title_sort |
st22 chronology for the skytrain ice rise ice core - part 2 : an age model to the last interglacial and disturbed deep stratigraphy |
publisher |
Copernicus GmbH |
publishDate |
2023 |
url |
https://lup.lub.lu.se/record/59a39a59-1eb8-4f16-9f9a-a8ca52132889 https://doi.org/10.5194/cp-19-851-2023 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(-78.333,-78.333,-79.583,-79.583) |
geographic |
Ronne Ice Shelf Skytrain Ice Rise |
geographic_facet |
Ronne Ice Shelf Skytrain Ice Rise |
genre |
Antarc* Antarctica ice core Ice Shelf Ronne Ice Shelf |
genre_facet |
Antarc* Antarctica ice core Ice Shelf Ronne Ice Shelf |
op_source |
Climate of the Past; 19(4), pp 851-864 (2023) ISSN: 1814-9324 |
op_relation |
https://lup.lub.lu.se/record/59a39a59-1eb8-4f16-9f9a-a8ca52132889 http://dx.doi.org/10.5194/cp-19-851-2023 scopus:85158077804 |
op_doi |
https://doi.org/10.5194/cp-19-851-2023 |
container_title |
Climate of the Past |
container_volume |
19 |
container_issue |
4 |
container_start_page |
851 |
op_container_end_page |
864 |
_version_ |
1776204782229258240 |