Past and present accumulation rate reconstruction along the Dome Fuji Kohnen radio echo-sounding profile
We use internal ice layers from a radio echo-sounding profile between the Kohnen and Dome Fuji deep drilling sites to the infer the spatio-temporal pattern of accumulation rate in this sector of Dronning Maud Land. Continuous internal reflection horizons can be traced to about half the ice thickness...
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ftawi:oai:epic.awi.de:13361 2023-09-05T13:14:58+02:00 Past and present accumulation rate reconstruction along the Dome Fuji Kohnen radio echo-sounding profile Rybak, Oleg Huybrechts, Philippe Pattyn, F. Steinhage, Daniel 2005 https://epic.awi.de/id/eprint/13361/ https://hdl.handle.net/10013/epic.23745 unknown Rybak, O. , Huybrechts, P. , Pattyn, F. and Steinhage, D. orcid:0000-0003-4737-9751 (2005) Past and present accumulation rate reconstruction along the Dome Fuji Kohnen radio echo-sounding profile , Polar Regions and Quaternary Climate, EuroConference toward an Integrative View of Climate in Antarctica and Circum-Antarctic Regions, Acquafredda di Maratea (I)September 2005 . hdl:10013/epic.23745 EPIC3Polar Regions and Quaternary Climate, EuroConference toward an Integrative View of Climate in Antarctica and Circum-Antarctic Regions, Acquafredda di Maratea (I)September 2005, 24 Conference notRev 2005 ftawi 2023-08-22T19:50:31Z We use internal ice layers from a radio echo-sounding profile between the Kohnen and Dome Fuji deep drilling sites to the infer the spatio-temporal pattern of accumulation rate in this sector of Dronning Maud Land. Continuous internal reflection horizons can be traced to about half the ice thickness and have a maximum age of ca. 70 ka BP. We have selected 7 time intervals over which we determine the average accumulation rate and average surface temperature at the place and time of origin of the layer particles. The layers are destrained from a rigorous flow calculation with a high-resolution higher-order flow model of Dronning Maud Land nested into a 3D thermomechanical model of the Antarctic ice sheet ran over the last few glacial cycles. A Lagrangian back-tracing algorithm provides the places of deposition of the layers along the profile to correct for flow advection. Further corrections are made for local elevation changes. Our results show substantially lower accumulation rates along the profile than shown by exisiting maps which had no surface control points. During the last glacial period we find a substantially lower accumulation rate than predicted by the usual approach linking palaeo-accumulation rates to the condensation temperature above the surface inversion layer. This finding helps to improve flow reconstructions of this area over the last glacial cycles and enables a more accurate dating by flow modeling of the EDML ice core. Conference Object Antarc* Antarctic Dronning Maud Land ice core 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) The Antarctic |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
We use internal ice layers from a radio echo-sounding profile between the Kohnen and Dome Fuji deep drilling sites to the infer the spatio-temporal pattern of accumulation rate in this sector of Dronning Maud Land. Continuous internal reflection horizons can be traced to about half the ice thickness and have a maximum age of ca. 70 ka BP. We have selected 7 time intervals over which we determine the average accumulation rate and average surface temperature at the place and time of origin of the layer particles. The layers are destrained from a rigorous flow calculation with a high-resolution higher-order flow model of Dronning Maud Land nested into a 3D thermomechanical model of the Antarctic ice sheet ran over the last few glacial cycles. A Lagrangian back-tracing algorithm provides the places of deposition of the layers along the profile to correct for flow advection. Further corrections are made for local elevation changes. Our results show substantially lower accumulation rates along the profile than shown by exisiting maps which had no surface control points. During the last glacial period we find a substantially lower accumulation rate than predicted by the usual approach linking palaeo-accumulation rates to the condensation temperature above the surface inversion layer. This finding helps to improve flow reconstructions of this area over the last glacial cycles and enables a more accurate dating by flow modeling of the EDML ice core. |
format |
Conference Object |
author |
Rybak, Oleg Huybrechts, Philippe Pattyn, F. Steinhage, Daniel |
spellingShingle |
Rybak, Oleg Huybrechts, Philippe Pattyn, F. Steinhage, Daniel Past and present accumulation rate reconstruction along the Dome Fuji Kohnen radio echo-sounding profile |
author_facet |
Rybak, Oleg Huybrechts, Philippe Pattyn, F. Steinhage, Daniel |
author_sort |
Rybak, Oleg |
title |
Past and present accumulation rate reconstruction along the Dome Fuji Kohnen radio echo-sounding profile |
title_short |
Past and present accumulation rate reconstruction along the Dome Fuji Kohnen radio echo-sounding profile |
title_full |
Past and present accumulation rate reconstruction along the Dome Fuji Kohnen radio echo-sounding profile |
title_fullStr |
Past and present accumulation rate reconstruction along the Dome Fuji Kohnen radio echo-sounding profile |
title_full_unstemmed |
Past and present accumulation rate reconstruction along the Dome Fuji Kohnen radio echo-sounding profile |
title_sort |
past and present accumulation rate reconstruction along the dome fuji kohnen radio echo-sounding profile |
publishDate |
2005 |
url |
https://epic.awi.de/id/eprint/13361/ https://hdl.handle.net/10013/epic.23745 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) ENVELOPE(0.000,0.000,-75.000,-75.000) |
geographic |
Antarctic Dome Fuji Dronning Maud Land Kohnen The Antarctic |
geographic_facet |
Antarctic Dome Fuji Dronning Maud Land Kohnen The Antarctic |
genre |
Antarc* Antarctic Dronning Maud Land ice core Ice Sheet |
genre_facet |
Antarc* Antarctic Dronning Maud Land ice core Ice Sheet |
op_source |
EPIC3Polar Regions and Quaternary Climate, EuroConference toward an Integrative View of Climate in Antarctica and Circum-Antarctic Regions, Acquafredda di Maratea (I)September 2005, 24 |
op_relation |
Rybak, O. , Huybrechts, P. , Pattyn, F. and Steinhage, D. orcid:0000-0003-4737-9751 (2005) Past and present accumulation rate reconstruction along the Dome Fuji Kohnen radio echo-sounding profile , Polar Regions and Quaternary Climate, EuroConference toward an Integrative View of Climate in Antarctica and Circum-Antarctic Regions, Acquafredda di Maratea (I)September 2005 . hdl:10013/epic.23745 |
_version_ |
1776196822730014720 |