A stratigraphy-based method for reconstructing ice core orientation
Ever since the first deep ice cores were drilled, it has been a challenge to determine their original, in-situ orientation. In general, the orientation of an ice core is lost as the drill is free to rotate during transport to the surface. For shallow ice cores, it is usually possible to match the ad...
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ftawi:oai:epic.awi.de:54454 2023-05-15T16:27:52+02:00 A stratigraphy-based method for reconstructing ice core orientation Westhoff, Julien Stoll, Nicolas Franke, Steven Weikusat, Ilka Bons, Paul D. Kerch, Johanna Jansen, Daniela Kipfstuhl, Sepp Dahl-Jensen, Dorthe 2021-04 application/pdf https://epic.awi.de/id/eprint/54454/ https://epic.awi.de/id/eprint/54454/1/EGU21-13150_presentation.pdf https://meetingorganizer.copernicus.org/EGU21/EGU21-13150.html https://hdl.handle.net/10013/epic.43c7bdbb-c0cd-4fcc-8e02-b543702964e0 https://hdl.handle.net/ unknown https://epic.awi.de/id/eprint/54454/1/EGU21-13150_presentation.pdf https://hdl.handle.net/ Westhoff, J. , Stoll, N. orcid:0000-0002-3219-8395 , Franke, S. orcid:0000-0001-8462-4379 , Weikusat, I. orcid:0000-0002-3023-6036 , Bons, P. D. , Kerch, J. orcid:0000-0002-7200-6837 , Jansen, D. orcid:0000-0002-4412-5820 , Kipfstuhl, S. and Dahl-Jensen, D. (2021) A stratigraphy-based method for reconstructing ice core orientation , EGU General Assembly 2021, Online, 19 April 2021 - 30 April 2021 . doi:10.5194/egusphere-egu21-13150 <https://doi.org/10.5194/egusphere-egu21-13150> , hdl:10013/epic.43c7bdbb-c0cd-4fcc-8e02-b543702964e0 EPIC3EGU General Assembly 2021, Online, 2021-04-19-2021-04-30 Conference notRev 2021 ftawi https://doi.org/10.5194/egusphere-egu21-13150 2021-12-24T15:46:27Z Ever since the first deep ice cores were drilled, it has been a challenge to determine their original, in-situ orientation. In general, the orientation of an ice core is lost as the drill is free to rotate during transport to the surface. For shallow ice cores, it is usually possible to match the adjacent core breaks, which preserves the orientation of the ice column. However, this method fails for deep ice cores, such as the EastGRIP ice core in Northeast Greenland. We provide a method to reconstruct ice core orientation using visual stratigraphy and borehole geometry. As the EastGRIP ice core is drilled through the Northeast Greenland Ice Stream, we use information about the directional structures to perform a full geographical re-orientation. We compared the core orientation with logging data from core break matching and the pattern of the stereographic projections of the crystals’c-axis orientations. Both comparisons agree very well with the proposed orientation method. The method works well for 441 out of 451 samples from a depth of 1375–2120 m in the EastGRIP ice core. It can also be applied to other ice cores, providing a better foundation for interpreting physical properties and understanding the flow of ice. Conference Object Greenland ice core Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Greenland |
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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 |
Ever since the first deep ice cores were drilled, it has been a challenge to determine their original, in-situ orientation. In general, the orientation of an ice core is lost as the drill is free to rotate during transport to the surface. For shallow ice cores, it is usually possible to match the adjacent core breaks, which preserves the orientation of the ice column. However, this method fails for deep ice cores, such as the EastGRIP ice core in Northeast Greenland. We provide a method to reconstruct ice core orientation using visual stratigraphy and borehole geometry. As the EastGRIP ice core is drilled through the Northeast Greenland Ice Stream, we use information about the directional structures to perform a full geographical re-orientation. We compared the core orientation with logging data from core break matching and the pattern of the stereographic projections of the crystals’c-axis orientations. Both comparisons agree very well with the proposed orientation method. The method works well for 441 out of 451 samples from a depth of 1375–2120 m in the EastGRIP ice core. It can also be applied to other ice cores, providing a better foundation for interpreting physical properties and understanding the flow of ice. |
format |
Conference Object |
author |
Westhoff, Julien Stoll, Nicolas Franke, Steven Weikusat, Ilka Bons, Paul D. Kerch, Johanna Jansen, Daniela Kipfstuhl, Sepp Dahl-Jensen, Dorthe |
spellingShingle |
Westhoff, Julien Stoll, Nicolas Franke, Steven Weikusat, Ilka Bons, Paul D. Kerch, Johanna Jansen, Daniela Kipfstuhl, Sepp Dahl-Jensen, Dorthe A stratigraphy-based method for reconstructing ice core orientation |
author_facet |
Westhoff, Julien Stoll, Nicolas Franke, Steven Weikusat, Ilka Bons, Paul D. Kerch, Johanna Jansen, Daniela Kipfstuhl, Sepp Dahl-Jensen, Dorthe |
author_sort |
Westhoff, Julien |
title |
A stratigraphy-based method for reconstructing ice core orientation |
title_short |
A stratigraphy-based method for reconstructing ice core orientation |
title_full |
A stratigraphy-based method for reconstructing ice core orientation |
title_fullStr |
A stratigraphy-based method for reconstructing ice core orientation |
title_full_unstemmed |
A stratigraphy-based method for reconstructing ice core orientation |
title_sort |
stratigraphy-based method for reconstructing ice core orientation |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/54454/ https://epic.awi.de/id/eprint/54454/1/EGU21-13150_presentation.pdf https://meetingorganizer.copernicus.org/EGU21/EGU21-13150.html https://hdl.handle.net/10013/epic.43c7bdbb-c0cd-4fcc-8e02-b543702964e0 https://hdl.handle.net/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core |
genre_facet |
Greenland ice core |
op_source |
EPIC3EGU General Assembly 2021, Online, 2021-04-19-2021-04-30 |
op_relation |
https://epic.awi.de/id/eprint/54454/1/EGU21-13150_presentation.pdf https://hdl.handle.net/ Westhoff, J. , Stoll, N. orcid:0000-0002-3219-8395 , Franke, S. orcid:0000-0001-8462-4379 , Weikusat, I. orcid:0000-0002-3023-6036 , Bons, P. D. , Kerch, J. orcid:0000-0002-7200-6837 , Jansen, D. orcid:0000-0002-4412-5820 , Kipfstuhl, S. and Dahl-Jensen, D. (2021) A stratigraphy-based method for reconstructing ice core orientation , EGU General Assembly 2021, Online, 19 April 2021 - 30 April 2021 . doi:10.5194/egusphere-egu21-13150 <https://doi.org/10.5194/egusphere-egu21-13150> , hdl:10013/epic.43c7bdbb-c0cd-4fcc-8e02-b543702964e0 |
op_doi |
https://doi.org/10.5194/egusphere-egu21-13150 |
_version_ |
1766017423686762496 |