Vostok (Antarctica) ice-core time-scale from datings of different origins
Three different approaches to ice-core age dating are employed to develop a depth-age relationship at Vostok, Antarctica: correlating the ice-core isotope record to the geophysical metronome (Milankovich surface temperature cycles) inferred from the borehole temperature profile, importing a known ch...
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Language: | English |
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International Glaciological Society
2004
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/28964 2023-05-15T13:46:14+02:00 Vostok (Antarctica) ice-core time-scale from datings of different origins SALAMATIN, Andrey N. TSYGANOVA, Elena A. LIPENKOV, Vladimir Y. PETIT, Jean-Robert 2004 https://oskar-bordeaux.fr/handle/20.500.12278/28964 https://doi.org/10.3189/172756404781814023 en eng International Glaciological Society 0260-3055 https://oskar-bordeaux.fr/handle/20.500.12278/28964 doi:10.3189/172756404781814023 http://creativecommons.org/licenses/by/ Planète et Univers [physics]/Sciences de la Terre/Glaciologie Article de revue 2004 ftoskarbordeaux https://doi.org/10.3189/172756404781814023 2021-05-11T22:31:01Z Three different approaches to ice-core age dating are employed to develop a depth-age relationship at Vostok, Antarctica: correlating the ice-core isotope record to the geophysical metronome (Milankovich surface temperature cycles) inferred from the borehole temperature profile, importing a known chronology from another (Devils Hole, Nevada, USA) paleoclimatic signal, and direct ice-sheet flow modeling. Inverse Monte Carlo sampling is used to constrain the accumulation-rate reconstruction and ice-flow simulations in order to find the best-fit glaciological time-scale matched with the two other chronologies. The general uncertainty of the different age estimates varies from 2 to 6 kyr on average and reaches 6-15 kyr at maximum. Whatever the causes of this discrepancy might be, they are thought to be of different origins, and the age errors are assumed statistically independent. Thus, the average time-scale for the Vostok ice core down to 3350 m depth is deduced consistent with all three dating procedures within the standard deviation limits of ±3.6 kyr, and its accuracy is estimated as 2.2 kyr on average. The constrained ice-sheet flow model allows, at least theoretically, extrapolation of the ice age-depth curve further to the boundary with the accreted lake ice where (at 3530 m depth) the glacier-ice age may reach ∼2000 kyr. Other/Unknown Material Antarc* Antarctica ice core Ice Sheet OSKAR Bordeaux (Open Science Knowledge ARchive) Devils Hole ENVELOPE(0.667,0.667,56.633,56.633) Annals of Glaciology 39 283 292 |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Planète et Univers [physics]/Sciences de la Terre/Glaciologie |
spellingShingle |
Planète et Univers [physics]/Sciences de la Terre/Glaciologie SALAMATIN, Andrey N. TSYGANOVA, Elena A. LIPENKOV, Vladimir Y. PETIT, Jean-Robert Vostok (Antarctica) ice-core time-scale from datings of different origins |
topic_facet |
Planète et Univers [physics]/Sciences de la Terre/Glaciologie |
description |
Three different approaches to ice-core age dating are employed to develop a depth-age relationship at Vostok, Antarctica: correlating the ice-core isotope record to the geophysical metronome (Milankovich surface temperature cycles) inferred from the borehole temperature profile, importing a known chronology from another (Devils Hole, Nevada, USA) paleoclimatic signal, and direct ice-sheet flow modeling. Inverse Monte Carlo sampling is used to constrain the accumulation-rate reconstruction and ice-flow simulations in order to find the best-fit glaciological time-scale matched with the two other chronologies. The general uncertainty of the different age estimates varies from 2 to 6 kyr on average and reaches 6-15 kyr at maximum. Whatever the causes of this discrepancy might be, they are thought to be of different origins, and the age errors are assumed statistically independent. Thus, the average time-scale for the Vostok ice core down to 3350 m depth is deduced consistent with all three dating procedures within the standard deviation limits of ±3.6 kyr, and its accuracy is estimated as 2.2 kyr on average. The constrained ice-sheet flow model allows, at least theoretically, extrapolation of the ice age-depth curve further to the boundary with the accreted lake ice where (at 3530 m depth) the glacier-ice age may reach ∼2000 kyr. |
format |
Other/Unknown Material |
author |
SALAMATIN, Andrey N. TSYGANOVA, Elena A. LIPENKOV, Vladimir Y. PETIT, Jean-Robert |
author_facet |
SALAMATIN, Andrey N. TSYGANOVA, Elena A. LIPENKOV, Vladimir Y. PETIT, Jean-Robert |
author_sort |
SALAMATIN, Andrey N. |
title |
Vostok (Antarctica) ice-core time-scale from datings of different origins |
title_short |
Vostok (Antarctica) ice-core time-scale from datings of different origins |
title_full |
Vostok (Antarctica) ice-core time-scale from datings of different origins |
title_fullStr |
Vostok (Antarctica) ice-core time-scale from datings of different origins |
title_full_unstemmed |
Vostok (Antarctica) ice-core time-scale from datings of different origins |
title_sort |
vostok (antarctica) ice-core time-scale from datings of different origins |
publisher |
International Glaciological Society |
publishDate |
2004 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/28964 https://doi.org/10.3189/172756404781814023 |
long_lat |
ENVELOPE(0.667,0.667,56.633,56.633) |
geographic |
Devils Hole |
geographic_facet |
Devils Hole |
genre |
Antarc* Antarctica ice core Ice Sheet |
genre_facet |
Antarc* Antarctica ice core Ice Sheet |
op_relation |
0260-3055 https://oskar-bordeaux.fr/handle/20.500.12278/28964 doi:10.3189/172756404781814023 |
op_rights |
http://creativecommons.org/licenses/by/ |
op_doi |
https://doi.org/10.3189/172756404781814023 |
container_title |
Annals of Glaciology |
container_volume |
39 |
container_start_page |
283 |
op_container_end_page |
292 |
_version_ |
1766238837734899712 |