Glacial-interglacial variations in central East Antarctica ice accumulation rates
Past rates of ice accumulation in central East Antarctica are defined poorly for the Last Glacial period. Ice cores, from which current estimates are based, are limited in number (there is one deep ice core at Vostok Station, one at Dome F and two others currently being extracted at Dome C and Dronn...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.576.3733 2023-05-15T13:50:08+02:00 Glacial-interglacial variations in central East Antarctica ice accumulation rates Martin J. Siegert The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.576.3733 http://www.cpom.org/research/mjs-qsr2.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.576.3733 http://www.cpom.org/research/mjs-qsr2.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.cpom.org/research/mjs-qsr2.pdf text ftciteseerx 2016-01-08T12:46:18Z Past rates of ice accumulation in central East Antarctica are defined poorly for the Last Glacial period. Ice cores, from which current estimates are based, are limited in number (there is one deep ice core at Vostok Station, one at Dome F and two others currently being extracted at Dome C and Dronning Maud Land), and are restricted spatially (they are one-dimensional). Here, spatial variations in ice accumulation rates during the Last Glacial are calculated from isochronous internal ice sheet layering, measured by airborne ice penetrating radar data. The layers are used to identify the stratigraphy around five East Antarctic ice domes. Isochrons are dated by linking them to the Vostok ice core and, in one case, the EPICA Dome C ice core. This chronostratigraphy allows the depth–age function to be identified across the ice sheet. A simple ice flow model, using the depth–age measurements as input, is then used to determine the spatial and temporal variation in East Antarctic ice accumulation over the Last Glacial cycle. The lowest rates of ice accumulation were predicted in the full glacial period to the south of Dome A and Ridge B. There are two possible explanations for this: (1) the ice divide topographies may have caused a ‘precipitation shadow ’ in the ice age; (2) with the expansion of the Ross ice shelf the area to the south of Dome A and Ridge B would be at the very centre of the ice sheet and, hence, at a maximum distance from the ocean moisture source. Text Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica EPICA ice core Ice Sheet Ice Shelf Ross Ice Shelf Unknown Antarctic Dome F ENVELOPE(39.700,39.700,-77.317,-77.317) Dronning Maud Land East Antarctica Ross Ice Shelf Vostok Station ENVELOPE(106.837,106.837,-78.464,-78.464) |
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ftciteseerx |
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English |
description |
Past rates of ice accumulation in central East Antarctica are defined poorly for the Last Glacial period. Ice cores, from which current estimates are based, are limited in number (there is one deep ice core at Vostok Station, one at Dome F and two others currently being extracted at Dome C and Dronning Maud Land), and are restricted spatially (they are one-dimensional). Here, spatial variations in ice accumulation rates during the Last Glacial are calculated from isochronous internal ice sheet layering, measured by airborne ice penetrating radar data. The layers are used to identify the stratigraphy around five East Antarctic ice domes. Isochrons are dated by linking them to the Vostok ice core and, in one case, the EPICA Dome C ice core. This chronostratigraphy allows the depth–age function to be identified across the ice sheet. A simple ice flow model, using the depth–age measurements as input, is then used to determine the spatial and temporal variation in East Antarctic ice accumulation over the Last Glacial cycle. The lowest rates of ice accumulation were predicted in the full glacial period to the south of Dome A and Ridge B. There are two possible explanations for this: (1) the ice divide topographies may have caused a ‘precipitation shadow ’ in the ice age; (2) with the expansion of the Ross ice shelf the area to the south of Dome A and Ridge B would be at the very centre of the ice sheet and, hence, at a maximum distance from the ocean moisture source. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Martin J. Siegert |
spellingShingle |
Martin J. Siegert Glacial-interglacial variations in central East Antarctica ice accumulation rates |
author_facet |
Martin J. Siegert |
author_sort |
Martin J. Siegert |
title |
Glacial-interglacial variations in central East Antarctica ice accumulation rates |
title_short |
Glacial-interglacial variations in central East Antarctica ice accumulation rates |
title_full |
Glacial-interglacial variations in central East Antarctica ice accumulation rates |
title_fullStr |
Glacial-interglacial variations in central East Antarctica ice accumulation rates |
title_full_unstemmed |
Glacial-interglacial variations in central East Antarctica ice accumulation rates |
title_sort |
glacial-interglacial variations in central east antarctica ice accumulation rates |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.576.3733 http://www.cpom.org/research/mjs-qsr2.pdf |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) ENVELOPE(106.837,106.837,-78.464,-78.464) |
geographic |
Antarctic Dome F Dronning Maud Land East Antarctica Ross Ice Shelf Vostok Station |
geographic_facet |
Antarctic Dome F Dronning Maud Land East Antarctica Ross Ice Shelf Vostok Station |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica EPICA ice core Ice Sheet Ice Shelf Ross Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica EPICA ice core Ice Sheet Ice Shelf Ross Ice Shelf |
op_source |
http://www.cpom.org/research/mjs-qsr2.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.576.3733 http://www.cpom.org/research/mjs-qsr2.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766253098385276928 |