The WAIS Divide deep ice core WD2014 chronology – Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference
The West Antarctic Ice Sheet Divide (WAIS Divide, WD) ice core is a newly drilled, high-accumulation deep ice core that provides Antarctic climate records of the past ∼68 ka at unprecedented temporal resolution. The upper 2850 m (back to 31.2 ka BP) have been dated using annual-layer counting. Here...
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Online Access: | https://doi.org/10.5194/cp-11-153-2015 https://doaj.org/article/264d3b1857fa4f80827934d3fba71e37 |
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ftdoajarticles:oai:doaj.org/article:264d3b1857fa4f80827934d3fba71e37 2023-05-15T13:40:35+02:00 The WAIS Divide deep ice core WD2014 chronology – Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference C. Buizert K. M. Cuffey J. P. Severinghaus D. Baggenstos T. J. Fudge E. J. Steig B. R. Markle M. Winstrup R. H. Rhodes E. J. Brook T. A. Sowers G. D. Clow H. Cheng R. L. Edwards M. Sigl J. R. McConnell K. C. Taylor 2015-02-01T00:00:00Z https://doi.org/10.5194/cp-11-153-2015 https://doaj.org/article/264d3b1857fa4f80827934d3fba71e37 EN eng Copernicus Publications http://www.clim-past.net/11/153/2015/cp-11-153-2015.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-11-153-2015 https://doaj.org/article/264d3b1857fa4f80827934d3fba71e37 Climate of the Past, Vol 11, Iss 2, Pp 153-173 (2015) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2015 ftdoajarticles https://doi.org/10.5194/cp-11-153-2015 2022-12-31T15:05:05Z The West Antarctic Ice Sheet Divide (WAIS Divide, WD) ice core is a newly drilled, high-accumulation deep ice core that provides Antarctic climate records of the past ∼68 ka at unprecedented temporal resolution. The upper 2850 m (back to 31.2 ka BP) have been dated using annual-layer counting. Here we present a chronology for the deep part of the core (67.8–31.2 ka BP), which is based on stratigraphic matching to annual-layer-counted Greenland ice cores using globally well-mixed atmospheric methane. We calculate the WD gas age–ice age difference (Δage) using a combination of firn densification modeling, ice-flow modeling, and a data set of δ 15 N-N 2 , a proxy for past firn column thickness. The largest Δage at WD occurs during the Last Glacial Maximum, and is 525 ± 120 years. Internally consistent solutions can be found only when assuming little to no influence of impurity content on densification rates, contrary to a recently proposed hypothesis. We synchronize the WD chronology to a linearly scaled version of the layer-counted Greenland Ice Core Chronology (GICC05), which brings the age of Dansgaard–Oeschger (DO) events into agreement with the U/Th absolutely dated Hulu Cave speleothem record. The small Δage at WD provides valuable opportunities to investigate the timing of atmospheric greenhouse gas variations relative to Antarctic climate, as well as the interhemispheric phasing of the "bipolar seesaw". Article in Journal/Newspaper Antarc* Antarctic Greenland Greenland ice core Greenland ice cores ice core Ice Sheet Directory of Open Access Journals: DOAJ Articles Antarctic West Antarctic Ice Sheet Greenland Hulu ENVELOPE(8.610,8.610,62.837,62.837) Climate of the Past 11 2 153 173 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 C. Buizert K. M. Cuffey J. P. Severinghaus D. Baggenstos T. J. Fudge E. J. Steig B. R. Markle M. Winstrup R. H. Rhodes E. J. Brook T. A. Sowers G. D. Clow H. Cheng R. L. Edwards M. Sigl J. R. McConnell K. C. Taylor The WAIS Divide deep ice core WD2014 chronology – Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
The West Antarctic Ice Sheet Divide (WAIS Divide, WD) ice core is a newly drilled, high-accumulation deep ice core that provides Antarctic climate records of the past ∼68 ka at unprecedented temporal resolution. The upper 2850 m (back to 31.2 ka BP) have been dated using annual-layer counting. Here we present a chronology for the deep part of the core (67.8–31.2 ka BP), which is based on stratigraphic matching to annual-layer-counted Greenland ice cores using globally well-mixed atmospheric methane. We calculate the WD gas age–ice age difference (Δage) using a combination of firn densification modeling, ice-flow modeling, and a data set of δ 15 N-N 2 , a proxy for past firn column thickness. The largest Δage at WD occurs during the Last Glacial Maximum, and is 525 ± 120 years. Internally consistent solutions can be found only when assuming little to no influence of impurity content on densification rates, contrary to a recently proposed hypothesis. We synchronize the WD chronology to a linearly scaled version of the layer-counted Greenland Ice Core Chronology (GICC05), which brings the age of Dansgaard–Oeschger (DO) events into agreement with the U/Th absolutely dated Hulu Cave speleothem record. The small Δage at WD provides valuable opportunities to investigate the timing of atmospheric greenhouse gas variations relative to Antarctic climate, as well as the interhemispheric phasing of the "bipolar seesaw". |
format |
Article in Journal/Newspaper |
author |
C. Buizert K. M. Cuffey J. P. Severinghaus D. Baggenstos T. J. Fudge E. J. Steig B. R. Markle M. Winstrup R. H. Rhodes E. J. Brook T. A. Sowers G. D. Clow H. Cheng R. L. Edwards M. Sigl J. R. McConnell K. C. Taylor |
author_facet |
C. Buizert K. M. Cuffey J. P. Severinghaus D. Baggenstos T. J. Fudge E. J. Steig B. R. Markle M. Winstrup R. H. Rhodes E. J. Brook T. A. Sowers G. D. Clow H. Cheng R. L. Edwards M. Sigl J. R. McConnell K. C. Taylor |
author_sort |
C. Buizert |
title |
The WAIS Divide deep ice core WD2014 chronology – Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference |
title_short |
The WAIS Divide deep ice core WD2014 chronology – Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference |
title_full |
The WAIS Divide deep ice core WD2014 chronology – Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference |
title_fullStr |
The WAIS Divide deep ice core WD2014 chronology – Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference |
title_full_unstemmed |
The WAIS Divide deep ice core WD2014 chronology – Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference |
title_sort |
wais divide deep ice core wd2014 chronology – part 1: methane synchronization (68–31 ka bp) and the gas age–ice age difference |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/cp-11-153-2015 https://doaj.org/article/264d3b1857fa4f80827934d3fba71e37 |
long_lat |
ENVELOPE(8.610,8.610,62.837,62.837) |
geographic |
Antarctic West Antarctic Ice Sheet Greenland Hulu |
geographic_facet |
Antarctic West Antarctic Ice Sheet Greenland Hulu |
genre |
Antarc* Antarctic Greenland Greenland ice core Greenland ice cores ice core Ice Sheet |
genre_facet |
Antarc* Antarctic Greenland Greenland ice core Greenland ice cores ice core Ice Sheet |
op_source |
Climate of the Past, Vol 11, Iss 2, Pp 153-173 (2015) |
op_relation |
http://www.clim-past.net/11/153/2015/cp-11-153-2015.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-11-153-2015 https://doaj.org/article/264d3b1857fa4f80827934d3fba71e37 |
op_doi |
https://doi.org/10.5194/cp-11-153-2015 |
container_title |
Climate of the Past |
container_volume |
11 |
container_issue |
2 |
container_start_page |
153 |
op_container_end_page |
173 |
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1766137330941296640 |