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 Skytrain Ice Rise ice core. 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 apply the...
Main Authors: | , , , , , , , , , , , , , , , |
---|---|
Format: | Text |
Language: | English |
Published: |
2022
|
Subjects: | |
Online Access: | https://doi.org/10.5194/cp-2022-84 https://cp.copernicus.org/preprints/cp-2022-84/ |
id |
ftcopernicus:oai:publications.copernicus.org:cpd107387 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:cpd107387 2023-05-15T16:38:57+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 William Grieman, Mackenzie Hoffmann, Helene Humby, Jack Nehrbass-Ahles, Christoph Rhodes, Rachael Rowell, Isobel Parrenin, Frédéric Schmidely, Loïc Fischer, Hubertus Stocker, Thomas Christl, Marcus Muscheler, Raimund Landais, Amaelle Prié, Frédéric 2022-11-07 application/pdf https://doi.org/10.5194/cp-2022-84 https://cp.copernicus.org/preprints/cp-2022-84/ eng eng doi:10.5194/cp-2022-84 https://cp.copernicus.org/preprints/cp-2022-84/ eISSN: 1814-9332 Text 2022 ftcopernicus https://doi.org/10.5194/cp-2022-84 2022-11-14T17:22:43Z We present an age model for the 651 m deep Skytrain Ice Rise ice core. 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 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 (617–628 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. 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 ice core Copernicus Publications: E-Journals Skytrain Ice Rise ENVELOPE(-78.333,-78.333,-79.583,-79.583) |
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 Skytrain Ice Rise ice core. 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 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 (617–628 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. 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 William Grieman, Mackenzie Hoffmann, Helene Humby, Jack Nehrbass-Ahles, Christoph Rhodes, Rachael Rowell, Isobel Parrenin, Frédéric Schmidely, Loïc Fischer, Hubertus Stocker, Thomas Christl, Marcus Muscheler, Raimund Landais, Amaelle Prié, Frédéric |
spellingShingle |
Mulvaney, Robert Wolff, Eric William Grieman, Mackenzie Hoffmann, Helene Humby, Jack Nehrbass-Ahles, Christoph Rhodes, Rachael Rowell, Isobel Parrenin, Frédéric Schmidely, Loïc Fischer, Hubertus Stocker, Thomas 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 William Grieman, Mackenzie Hoffmann, Helene Humby, Jack Nehrbass-Ahles, Christoph Rhodes, Rachael Rowell, Isobel Parrenin, Frédéric Schmidely, Loïc Fischer, Hubertus Stocker, Thomas 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 |
2022 |
url |
https://doi.org/10.5194/cp-2022-84 https://cp.copernicus.org/preprints/cp-2022-84/ |
long_lat |
ENVELOPE(-78.333,-78.333,-79.583,-79.583) |
geographic |
Skytrain Ice Rise |
geographic_facet |
Skytrain Ice Rise |
genre |
ice core |
genre_facet |
ice core |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-2022-84 https://cp.copernicus.org/preprints/cp-2022-84/ |
op_doi |
https://doi.org/10.5194/cp-2022-84 |
_version_ |
1766029317873074176 |