The WAIS Divide Deep Ice Core WD2014 Chronology – Part 2: Annual-Layer Counting (0–31 ka BP)
We present the WD2014 chronology for the upper part (0–2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes...
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ftdartmouthcoll:oai:digitalcommons.dartmouth.edu:facoa-1709 2023-07-16T03:53:31+02:00 The WAIS Divide Deep Ice Core WD2014 Chronology – Part 2: Annual-Layer Counting (0–31 ka BP) Sigl, Michael Fudge, Tyler J Winstrup, Mai Cole-Dai, Jihong Ferris, David 2016-03-30T07:00:00Z application/pdf https://digitalcommons.dartmouth.edu/facoa/707 https://doi.org/10.5194/cp-12-769-2016 https://digitalcommons.dartmouth.edu/context/facoa/article/1709/viewcontent/cp_12_769_2016.pdf unknown Dartmouth Digital Commons https://digitalcommons.dartmouth.edu/facoa/707 doi:10.5194/cp-12-769-2016 https://digitalcommons.dartmouth.edu/context/facoa/article/1709/viewcontent/cp_12_769_2016.pdf Dartmouth Scholarship Atmospheric Sciences Climate Earth Sciences text 2016 ftdartmouthcoll https://doi.org/10.5194/cp-12-769-2016 2023-06-28T10:43:00Z We present the WD2014 chronology for the upper part (0–2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes in the source, transport, and deposition of aerosols. The measurements were interpreted manually and with the aid of two automated methods. We validated the chronology by comparing to two high-accuracy, absolutely dated chronologies. For the Holocene, the cosmogenic isotope records of Be from WAIS Divide and C for IntCal13 demonstrated that WD2014 was consistently accurate to better than 0.5 % of the age. For the glacial period, comparisons to the Hulu Cave chronology demonstrated that WD2014 had an accuracy of better than 1 % of the age at three abrupt climate change events between 27 and 31 ka. WD2014 has consistently younger ages than Greenland ice core chronologies during most of the Holocene. For the Younger Dryas–Preboreal transition (11.595 ka; 24 years younger) and the Bølling–Allerød Warming (14.621 ka; 7 years younger), WD2014 ages are within the combined uncertainties of the timescales. Given its high accuracy, WD2014 can become a reference chronology for the Southern Hemisphere, with synchronization to other chronologies feasible using high-quality proxies of volcanism, solar activity, atmospheric mineral dust, and atmospheric methane concentrations. Text Antarc* Antarctic Greenland Greenland ice core ice core Ice Sheet Dartmouth Digital Commons (Dartmouth College) Antarctic Greenland Hulu ENVELOPE(8.610,8.610,62.837,62.837) West Antarctic Ice Sheet Climate of the Past 12 3 769 786 |
institution |
Open Polar |
collection |
Dartmouth Digital Commons (Dartmouth College) |
op_collection_id |
ftdartmouthcoll |
language |
unknown |
topic |
Atmospheric Sciences Climate Earth Sciences |
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Atmospheric Sciences Climate Earth Sciences Sigl, Michael Fudge, Tyler J Winstrup, Mai Cole-Dai, Jihong Ferris, David The WAIS Divide Deep Ice Core WD2014 Chronology – Part 2: Annual-Layer Counting (0–31 ka BP) |
topic_facet |
Atmospheric Sciences Climate Earth Sciences |
description |
We present the WD2014 chronology for the upper part (0–2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes in the source, transport, and deposition of aerosols. The measurements were interpreted manually and with the aid of two automated methods. We validated the chronology by comparing to two high-accuracy, absolutely dated chronologies. For the Holocene, the cosmogenic isotope records of Be from WAIS Divide and C for IntCal13 demonstrated that WD2014 was consistently accurate to better than 0.5 % of the age. For the glacial period, comparisons to the Hulu Cave chronology demonstrated that WD2014 had an accuracy of better than 1 % of the age at three abrupt climate change events between 27 and 31 ka. WD2014 has consistently younger ages than Greenland ice core chronologies during most of the Holocene. For the Younger Dryas–Preboreal transition (11.595 ka; 24 years younger) and the Bølling–Allerød Warming (14.621 ka; 7 years younger), WD2014 ages are within the combined uncertainties of the timescales. Given its high accuracy, WD2014 can become a reference chronology for the Southern Hemisphere, with synchronization to other chronologies feasible using high-quality proxies of volcanism, solar activity, atmospheric mineral dust, and atmospheric methane concentrations. |
format |
Text |
author |
Sigl, Michael Fudge, Tyler J Winstrup, Mai Cole-Dai, Jihong Ferris, David |
author_facet |
Sigl, Michael Fudge, Tyler J Winstrup, Mai Cole-Dai, Jihong Ferris, David |
author_sort |
Sigl, Michael |
title |
The WAIS Divide Deep Ice Core WD2014 Chronology – Part 2: Annual-Layer Counting (0–31 ka BP) |
title_short |
The WAIS Divide Deep Ice Core WD2014 Chronology – Part 2: Annual-Layer Counting (0–31 ka BP) |
title_full |
The WAIS Divide Deep Ice Core WD2014 Chronology – Part 2: Annual-Layer Counting (0–31 ka BP) |
title_fullStr |
The WAIS Divide Deep Ice Core WD2014 Chronology – Part 2: Annual-Layer Counting (0–31 ka BP) |
title_full_unstemmed |
The WAIS Divide Deep Ice Core WD2014 Chronology – Part 2: Annual-Layer Counting (0–31 ka BP) |
title_sort |
wais divide deep ice core wd2014 chronology – part 2: annual-layer counting (0–31 ka bp) |
publisher |
Dartmouth Digital Commons |
publishDate |
2016 |
url |
https://digitalcommons.dartmouth.edu/facoa/707 https://doi.org/10.5194/cp-12-769-2016 https://digitalcommons.dartmouth.edu/context/facoa/article/1709/viewcontent/cp_12_769_2016.pdf |
long_lat |
ENVELOPE(8.610,8.610,62.837,62.837) |
geographic |
Antarctic Greenland Hulu West Antarctic Ice Sheet |
geographic_facet |
Antarctic Greenland Hulu West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Greenland Greenland ice core ice core Ice Sheet |
genre_facet |
Antarc* Antarctic Greenland Greenland ice core ice core Ice Sheet |
op_source |
Dartmouth Scholarship |
op_relation |
https://digitalcommons.dartmouth.edu/facoa/707 doi:10.5194/cp-12-769-2016 https://digitalcommons.dartmouth.edu/context/facoa/article/1709/viewcontent/cp_12_769_2016.pdf |
op_doi |
https://doi.org/10.5194/cp-12-769-2016 |
container_title |
Climate of the Past |
container_volume |
12 |
container_issue |
3 |
container_start_page |
769 |
op_container_end_page |
786 |
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1771550885175885824 |