Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area using flow modeling and compositional matching to deep ice cores
We explore methods of dating a 101 m ice core from a bare ice ablation area in the Yamato Mountains, Dronning Maud Land, East Antarctica. There are two unknowns, the age of the ice at the surface and the age spanned by the core. The ice crystal growth rate was used to estimate the age span of the co...
Published in: | Journal of Geophysical Research |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Geophysical Union
2006
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/87/ http://www.agu.org/pubs/crossref/2006/2005JD006343.shtml https://doi.org/10.1029/2005JD006343 |
id |
ftnerc:oai:nora.nerc.ac.uk:87 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:87 2024-06-09T07:40:24+00:00 Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area using flow modeling and compositional matching to deep ice cores Moore, John C. Nishio, Fumihiko Fujita, Shuji Narita, Hideki Pasteur, Elizabeth Grinsted, Aslak Sinisalo, Anna Maeno, Norikazu 2006 http://nora.nerc.ac.uk/id/eprint/87/ http://www.agu.org/pubs/crossref/2006/2005JD006343.shtml https://doi.org/10.1029/2005JD006343 unknown American Geophysical Union Moore, John C.; Nishio, Fumihiko; Fujita, Shuji; Narita, Hideki; Pasteur, Elizabeth; Grinsted, Aslak; Sinisalo, Anna; Maeno, Norikazu. 2006 Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area using flow modeling and compositional matching to deep ice cores. Journal of Geophysical Research, 111 (D16), D16302. 17, pp. https://doi.org/10.1029/2005JD006343 <https://doi.org/10.1029/2005JD006343> Glaciology Publication - Article PeerReviewed 2006 ftnerc https://doi.org/10.1029/2005JD006343 2024-05-15T08:39:04Z We explore methods of dating a 101 m ice core from a bare ice ablation area in the Yamato Mountains, Dronning Maud Land, East Antarctica. There are two unknowns, the age of the ice at the surface and the age spanned by the core. The ice crystal growth rate was used to estimate the age span of the core at about 5 kyr. CO2, CH4 and N2O data on the core were compared with well-dated records from deep cores, leading to two plausible matches, both within isotope stage C. Detailed comparison of high-resolution DEP records from this core and the Dome Fuji core support the 55–61 kyr BP fit best. Oxygen isotope values in the core were then used to constrain the source elevation of the snow in the core, and hence the velocities in a simple flow line model. We inverted the ice core surface age, age span and origin site and their confidence intervals in a sensitivity study of flow model parameter space. The flow line model predicts good matches to the core by reducing glacial flow rates to 70% of present-day, accumulation rates by 45% with 10% confidence intervals. The modeled surface age for the whole meteorite field yields maximum surface ages of about 90 kyr, which is consistent with known, but poorly constrained, tephra dating, meteorite terrestrial ages and the frequency of meteorite discoveries. This approach can be used quite generally to link deep ice cores to surface outcrops on blue ice fields Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land East Antarctica ice core Natural Environment Research Council: NERC Open Research Archive Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) Dronning Maud Land East Antarctica Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) Journal of Geophysical Research 111 D16 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Glaciology |
spellingShingle |
Glaciology Moore, John C. Nishio, Fumihiko Fujita, Shuji Narita, Hideki Pasteur, Elizabeth Grinsted, Aslak Sinisalo, Anna Maeno, Norikazu Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area using flow modeling and compositional matching to deep ice cores |
topic_facet |
Glaciology |
description |
We explore methods of dating a 101 m ice core from a bare ice ablation area in the Yamato Mountains, Dronning Maud Land, East Antarctica. There are two unknowns, the age of the ice at the surface and the age spanned by the core. The ice crystal growth rate was used to estimate the age span of the core at about 5 kyr. CO2, CH4 and N2O data on the core were compared with well-dated records from deep cores, leading to two plausible matches, both within isotope stage C. Detailed comparison of high-resolution DEP records from this core and the Dome Fuji core support the 55–61 kyr BP fit best. Oxygen isotope values in the core were then used to constrain the source elevation of the snow in the core, and hence the velocities in a simple flow line model. We inverted the ice core surface age, age span and origin site and their confidence intervals in a sensitivity study of flow model parameter space. The flow line model predicts good matches to the core by reducing glacial flow rates to 70% of present-day, accumulation rates by 45% with 10% confidence intervals. The modeled surface age for the whole meteorite field yields maximum surface ages of about 90 kyr, which is consistent with known, but poorly constrained, tephra dating, meteorite terrestrial ages and the frequency of meteorite discoveries. This approach can be used quite generally to link deep ice cores to surface outcrops on blue ice fields |
format |
Article in Journal/Newspaper |
author |
Moore, John C. Nishio, Fumihiko Fujita, Shuji Narita, Hideki Pasteur, Elizabeth Grinsted, Aslak Sinisalo, Anna Maeno, Norikazu |
author_facet |
Moore, John C. Nishio, Fumihiko Fujita, Shuji Narita, Hideki Pasteur, Elizabeth Grinsted, Aslak Sinisalo, Anna Maeno, Norikazu |
author_sort |
Moore, John C. |
title |
Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area using flow modeling and compositional matching to deep ice cores |
title_short |
Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area using flow modeling and compositional matching to deep ice cores |
title_full |
Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area using flow modeling and compositional matching to deep ice cores |
title_fullStr |
Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area using flow modeling and compositional matching to deep ice cores |
title_full_unstemmed |
Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area using flow modeling and compositional matching to deep ice cores |
title_sort |
interpreting ancient ice in a shallow ice core from the south yamato (antarctica) blue ice area using flow modeling and compositional matching to deep ice cores |
publisher |
American Geophysical Union |
publishDate |
2006 |
url |
http://nora.nerc.ac.uk/id/eprint/87/ http://www.agu.org/pubs/crossref/2006/2005JD006343.shtml https://doi.org/10.1029/2005JD006343 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
Dome Fuji Dronning Maud Land East Antarctica Yamato |
geographic_facet |
Dome Fuji Dronning Maud Land East Antarctica Yamato |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica ice core |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica ice core |
op_relation |
Moore, John C.; Nishio, Fumihiko; Fujita, Shuji; Narita, Hideki; Pasteur, Elizabeth; Grinsted, Aslak; Sinisalo, Anna; Maeno, Norikazu. 2006 Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area using flow modeling and compositional matching to deep ice cores. Journal of Geophysical Research, 111 (D16), D16302. 17, pp. https://doi.org/10.1029/2005JD006343 <https://doi.org/10.1029/2005JD006343> |
op_doi |
https://doi.org/10.1029/2005JD006343 |
container_title |
Journal of Geophysical Research |
container_volume |
111 |
container_issue |
D16 |
_version_ |
1801383822180220928 |