Gas age -ice age differences and the chronology of the Vostok ice core, 0 -100 ka
[1] Gas is trapped in polar ice at depths of $50-120 m and is therefore significantly younger than the ice in which it is embedded. The age difference is not well constrained for slowly accumulating ice on the East Antarctic Plateau, introducing a significant uncertainty into chronologies of the old...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1090.3906 2023-05-15T13:51:08+02:00 Gas age -ice age differences and the chronology of the Vostok ice core, 0 -100 ka M L Bender G Floch J Chappellaz M Suwa J.-M Barnola T Blunier G Dreyfus J Jouzel F Parrenin The Pennsylvania State University CiteSeerX Archives 2006 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1090.3906 http://geoweb.princeton.edu/people/bender/lab/downloads/Bender_et_al_2006_Dage.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1090.3906 http://geoweb.princeton.edu/people/bender/lab/downloads/Bender_et_al_2006_Dage.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://geoweb.princeton.edu/people/bender/lab/downloads/Bender_et_al_2006_Dage.pdf text 2006 ftciteseerx 2020-05-24T00:22:58Z [1] Gas is trapped in polar ice at depths of $50-120 m and is therefore significantly younger than the ice in which it is embedded. The age difference is not well constrained for slowly accumulating ice on the East Antarctic Plateau, introducing a significant uncertainty into chronologies of the oldest deep ice cores (Vostok, Dome Fuji, and Dome C). We recorrelate the gas records of Vostok and Greenland Ice Sheet Project 2 (GISP2) cores in part on the basis of new CH 4 data and use these records to construct six Vostok chronologies that use different assumptions to calculate gas age-ice age differences. We then evaluate these chronologies by comparing times of climate events at Vostok with correlative events in the well-dated Byrd ice core (West Antarctica). From this evaluation we identify two leading chronologies for the Vostok core that are based on recent models of firn temperature, firn densification, and thinning of upstream ice. One chronology involves calculating gas age-ice age differences from these models. The second, new, approach involves calculating ice depths in the core that are contemporaneous with depths in the same ice core whose gas ages are well constrained. This latter approach circumvents problems associated with highly uncertain accumulation rates in the Vostok core. The uncertainty in Vostok chronologies derived by correlating into the GISP2 gas record remains about ±1 kyr, and high-precision correlations continue to be difficult. Text Antarc* Antarctic Antarctica Greenland Greenland Ice Sheet Project ice core Ice Sheet West Antarctica Unknown Antarctic Byrd Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) Greenland West Antarctica |
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Open Polar |
collection |
Unknown |
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ftciteseerx |
language |
English |
description |
[1] Gas is trapped in polar ice at depths of $50-120 m and is therefore significantly younger than the ice in which it is embedded. The age difference is not well constrained for slowly accumulating ice on the East Antarctic Plateau, introducing a significant uncertainty into chronologies of the oldest deep ice cores (Vostok, Dome Fuji, and Dome C). We recorrelate the gas records of Vostok and Greenland Ice Sheet Project 2 (GISP2) cores in part on the basis of new CH 4 data and use these records to construct six Vostok chronologies that use different assumptions to calculate gas age-ice age differences. We then evaluate these chronologies by comparing times of climate events at Vostok with correlative events in the well-dated Byrd ice core (West Antarctica). From this evaluation we identify two leading chronologies for the Vostok core that are based on recent models of firn temperature, firn densification, and thinning of upstream ice. One chronology involves calculating gas age-ice age differences from these models. The second, new, approach involves calculating ice depths in the core that are contemporaneous with depths in the same ice core whose gas ages are well constrained. This latter approach circumvents problems associated with highly uncertain accumulation rates in the Vostok core. The uncertainty in Vostok chronologies derived by correlating into the GISP2 gas record remains about ±1 kyr, and high-precision correlations continue to be difficult. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
M L Bender G Floch J Chappellaz M Suwa J.-M Barnola T Blunier G Dreyfus J Jouzel F Parrenin |
spellingShingle |
M L Bender G Floch J Chappellaz M Suwa J.-M Barnola T Blunier G Dreyfus J Jouzel F Parrenin Gas age -ice age differences and the chronology of the Vostok ice core, 0 -100 ka |
author_facet |
M L Bender G Floch J Chappellaz M Suwa J.-M Barnola T Blunier G Dreyfus J Jouzel F Parrenin |
author_sort |
M L Bender |
title |
Gas age -ice age differences and the chronology of the Vostok ice core, 0 -100 ka |
title_short |
Gas age -ice age differences and the chronology of the Vostok ice core, 0 -100 ka |
title_full |
Gas age -ice age differences and the chronology of the Vostok ice core, 0 -100 ka |
title_fullStr |
Gas age -ice age differences and the chronology of the Vostok ice core, 0 -100 ka |
title_full_unstemmed |
Gas age -ice age differences and the chronology of the Vostok ice core, 0 -100 ka |
title_sort |
gas age -ice age differences and the chronology of the vostok ice core, 0 -100 ka |
publishDate |
2006 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1090.3906 http://geoweb.princeton.edu/people/bender/lab/downloads/Bender_et_al_2006_Dage.pdf |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) |
geographic |
Antarctic Byrd Dome Fuji Greenland West Antarctica |
geographic_facet |
Antarctic Byrd Dome Fuji Greenland West Antarctica |
genre |
Antarc* Antarctic Antarctica Greenland Greenland Ice Sheet Project ice core Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Greenland Greenland Ice Sheet Project ice core Ice Sheet West Antarctica |
op_source |
http://geoweb.princeton.edu/people/bender/lab/downloads/Bender_et_al_2006_Dage.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1090.3906 http://geoweb.princeton.edu/people/bender/lab/downloads/Bender_et_al_2006_Dage.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766254742385721344 |