Dating and accumulation rate reconstruction along the Dome Fuji Kohnen radio-echo-sounding profile
A radio echo-sounding profile of about 1200 km length was flown by the Alfred-Wegener Institute between the Kohnen and Dome Fuji deep drilling sites, providing a continuous record of internal ice layers which links both sites. Assuming these layers are isochronous surfaces, they provide an internal...
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ftawi:oai:epic.awi.de:12248 2023-09-05T13:13:50+02:00 Dating and accumulation rate reconstruction along the Dome Fuji Kohnen radio-echo-sounding profile Rybak, Oleg Huybrechts, Philippe Steinhage, Daniel Pattyn, F. 2005 https://epic.awi.de/id/eprint/12248/ https://hdl.handle.net/10013/epic.22682 unknown Rybak, O. , Huybrechts, P. , Steinhage, D. orcid:0000-0003-4737-9751 and Pattyn, F. (2005) Dating and accumulation rate reconstruction along the Dome Fuji Kohnen radio-echo-sounding profile , European Geosciences Union Second General Assembly, Wien (Austria), 25-29 April 2005, Geophysical Research Abstracts, vol. 7CD-ROM) . hdl:10013/epic.22682 EPIC3European Geosciences Union Second General Assembly, Wien (Austria), 25-29 April 2005, Geophysical Research Abstracts, vol. 7CD-ROM), 05421 Conference notRev 2005 ftawi 2023-08-22T19:49:48Z A radio echo-sounding profile of about 1200 km length was flown by the Alfred-Wegener Institute between the Kohnen and Dome Fuji deep drilling sites, providing a continuous record of internal ice layers which links both sites. Assuming these layers are isochronous surfaces, they provide an internal check on independently derived datings for both drilling sites. Here we use these internal layers to infer average accumulation rates. This is done both for the Holocene as for the last glacial period for the time intervals which separate the individual layers. Internal reflection horizons can be traced to about half the ice thickness and have a maximum age of ca. 70 ka BP. We use a high-resolution higher-order flow model of Dronning Maud Land nested into a 3D thermomechanical model of the Antarctic ice sheet to reconstruct the flow history over the last few glacial cycles. A Lagrangian back-tracing algorithm provides the times of deposition of the layers along the profile for a forward experiment with a prescribed accumulation history. We then apply an inverse method to find the accumulation history which best fits the observed layer architecture. The model predicts no basal melting at Kohnen station, but gives evidence of basal melting at the Dome Fuji drill site. We further investigate the strain history around Dome Fuji to estimate the effect of normal stresses on the derived age-depth profile. Conference Object Antarc* Antarctic Dronning Maud Land Ice Sheet Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) Dronning Maud Land Kohnen ENVELOPE(0.000,0.000,-75.000,-75.000) Kohnen Station ENVELOPE(0.000,0.000,-75.000,-75.000) The Antarctic |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
A radio echo-sounding profile of about 1200 km length was flown by the Alfred-Wegener Institute between the Kohnen and Dome Fuji deep drilling sites, providing a continuous record of internal ice layers which links both sites. Assuming these layers are isochronous surfaces, they provide an internal check on independently derived datings for both drilling sites. Here we use these internal layers to infer average accumulation rates. This is done both for the Holocene as for the last glacial period for the time intervals which separate the individual layers. Internal reflection horizons can be traced to about half the ice thickness and have a maximum age of ca. 70 ka BP. We use a high-resolution higher-order flow model of Dronning Maud Land nested into a 3D thermomechanical model of the Antarctic ice sheet to reconstruct the flow history over the last few glacial cycles. A Lagrangian back-tracing algorithm provides the times of deposition of the layers along the profile for a forward experiment with a prescribed accumulation history. We then apply an inverse method to find the accumulation history which best fits the observed layer architecture. The model predicts no basal melting at Kohnen station, but gives evidence of basal melting at the Dome Fuji drill site. We further investigate the strain history around Dome Fuji to estimate the effect of normal stresses on the derived age-depth profile. |
format |
Conference Object |
author |
Rybak, Oleg Huybrechts, Philippe Steinhage, Daniel Pattyn, F. |
spellingShingle |
Rybak, Oleg Huybrechts, Philippe Steinhage, Daniel Pattyn, F. Dating and accumulation rate reconstruction along the Dome Fuji Kohnen radio-echo-sounding profile |
author_facet |
Rybak, Oleg Huybrechts, Philippe Steinhage, Daniel Pattyn, F. |
author_sort |
Rybak, Oleg |
title |
Dating and accumulation rate reconstruction along the Dome Fuji Kohnen radio-echo-sounding profile |
title_short |
Dating and accumulation rate reconstruction along the Dome Fuji Kohnen radio-echo-sounding profile |
title_full |
Dating and accumulation rate reconstruction along the Dome Fuji Kohnen radio-echo-sounding profile |
title_fullStr |
Dating and accumulation rate reconstruction along the Dome Fuji Kohnen radio-echo-sounding profile |
title_full_unstemmed |
Dating and accumulation rate reconstruction along the Dome Fuji Kohnen radio-echo-sounding profile |
title_sort |
dating and accumulation rate reconstruction along the dome fuji kohnen radio-echo-sounding profile |
publishDate |
2005 |
url |
https://epic.awi.de/id/eprint/12248/ https://hdl.handle.net/10013/epic.22682 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) ENVELOPE(0.000,0.000,-75.000,-75.000) ENVELOPE(0.000,0.000,-75.000,-75.000) |
geographic |
Antarctic Dome Fuji Dronning Maud Land Kohnen Kohnen Station The Antarctic |
geographic_facet |
Antarctic Dome Fuji Dronning Maud Land Kohnen Kohnen Station The Antarctic |
genre |
Antarc* Antarctic Dronning Maud Land Ice Sheet |
genre_facet |
Antarc* Antarctic Dronning Maud Land Ice Sheet |
op_source |
EPIC3European Geosciences Union Second General Assembly, Wien (Austria), 25-29 April 2005, Geophysical Research Abstracts, vol. 7CD-ROM), 05421 |
op_relation |
Rybak, O. , Huybrechts, P. , Steinhage, D. orcid:0000-0003-4737-9751 and Pattyn, F. (2005) Dating and accumulation rate reconstruction along the Dome Fuji Kohnen radio-echo-sounding profile , European Geosciences Union Second General Assembly, Wien (Austria), 25-29 April 2005, Geophysical Research Abstracts, vol. 7CD-ROM) . hdl:10013/epic.22682 |
_version_ |
1776204982586966016 |