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 651 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...
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ftcopernicus:oai:publications.copernicus.org:cp107387 2023-06-11T04:06:49+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 application/pdf https://doi.org/10.5194/cp-19-851-2023 https://cp.copernicus.org/articles/19/851/2023/ eng eng doi:10.5194/cp-19-851-2023 https://cp.copernicus.org/articles/19/851/2023/ eISSN: 1814-9332 Text 2023 ftcopernicus https://doi.org/10.5194/cp-19-851-2023 2023-05-01T16:23:11Z We present an age model for the 651 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, δ 18 O air in the ice phase ties are through 10 Be across the Laschamps event and through ice chemistry related to long-range dust transport and deposition. This strategy provides a good outcome to about 108 ka ( ∼ 605 m). Beyond that there are signs of flow disturbance, with a section of ice probably repeated. Nonetheless values of CH 4 and δ 18 O air confirm that part of the last interglacial (LIG), from about 117–126 ka (617–627 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 628 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 631 m appears to be of age > 150 ka. Text Antarc* Antarctica ice core Ice Shelf Ronne Ice Shelf Copernicus Publications: E-Journals 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 |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
We present an age model for the 651 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, δ 18 O air in the ice phase ties are through 10 Be across the Laschamps event and through ice chemistry related to long-range dust transport and deposition. This strategy provides a good outcome to about 108 ka ( ∼ 605 m). Beyond that there are signs of flow disturbance, with a section of ice probably repeated. Nonetheless values of CH 4 and δ 18 O air confirm that part of the last interglacial (LIG), from about 117–126 ka (617–627 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 628 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 631 m appears to be of age > 150 ka. |
format |
Text |
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 |
spellingShingle |
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 |
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 |
publishDate |
2023 |
url |
https://doi.org/10.5194/cp-19-851-2023 https://cp.copernicus.org/articles/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 |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-19-851-2023 https://cp.copernicus.org/articles/19/851/2023/ |
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 |
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1768378977626357760 |