Microstructure, micro-inclusions, and mineralogy along the EGRIP ice core – Part 1: Localisation of inclusions and deformation patterns

Impurities deposited in polar ice enable the reconstruction of the atmospheric aerosol concentration of the past. At the same time they impact the physical properties of the ice itself such as its deformation behaviour. Impurities are thought to enhance ice deformation, but observations are ambiguou...

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Published in:The Cryosphere
Main Authors: Stoll, Nicolas, Eichler, Jan, Hörhold, Maria, Erhardt, Tobias, Jensen, Camilla, Weikusat, Ilka
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2021
Subjects:
Online Access:https://doi.org/10.5194/tc-15-5717-2021
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spelling ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00059663 2023-05-15T16:03:52+02:00 Microstructure, micro-inclusions, and mineralogy along the EGRIP ice core – Part 1: Localisation of inclusions and deformation patterns Stoll, Nicolas Eichler, Jan Hörhold, Maria Erhardt, Tobias Jensen, Camilla Weikusat, Ilka 2021-12 electronic https://doi.org/10.5194/tc-15-5717-2021 https://noa.gwlb.de/receive/cop_mods_00059663 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059312/tc-15-5717-2021.pdf https://tc.copernicus.org/articles/15/5717/2021/tc-15-5717-2021.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-15-5717-2021 https://noa.gwlb.de/receive/cop_mods_00059663 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059312/tc-15-5717-2021.pdf https://tc.copernicus.org/articles/15/5717/2021/tc-15-5717-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/tc-15-5717-2021 2022-02-08T22:32:29Z Impurities deposited in polar ice enable the reconstruction of the atmospheric aerosol concentration of the past. At the same time they impact the physical properties of the ice itself such as its deformation behaviour. Impurities are thought to enhance ice deformation, but observations are ambiguous due to a shortage of comprehensive microstructural analyses. For the first time, we systematically analyse micro-inclusions in polar fast flowing ice, i.e. from the East Greenland Ice Core Project ice core drilled through the Northeast Greenland Ice Stream. In direct relation to the inclusions we derive the crystal preferred orientation, fabric, grain size, and microstructural features at 10 depths, covering the Holocene and Late Glacial. We use optical microscopy to create microstructure maps to analyse the in situ locations of inclusions in the polycrystalline, solid ice samples. Micro-inclusions are more variable in spatial distribution than previously observed and show various distributional patterns ranging from centimetre-thick layers to clusters and solitary particles, independent of depth. In half of all samples, micro-inclusions are more often located at or close to the grain boundaries by a slight margin (in the areas occupied by grain boundaries). Throughout all samples we find strong indications of dynamic recrystallisation, such as grain islands, bulging grains, and different types of sub-grain boundaries. We discuss the spatial variability in micro-inclusions, the link between spatial variability and mineralogy, and possible effects on the microstructure and deformation behaviour of the ice. Our results emphasise the need for holistic approaches in future studies, combining microstructure and impurity analysis. Article in Journal/Newspaper East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core The Cryosphere Niedersächsisches Online-Archiv NOA Greenland The Cryosphere 15 12 5717 5737
institution Open Polar
collection Niedersächsisches Online-Archiv NOA
op_collection_id ftnonlinearchiv
language English
topic article
Verlagsveröffentlichung
spellingShingle article
Verlagsveröffentlichung
Stoll, Nicolas
Eichler, Jan
Hörhold, Maria
Erhardt, Tobias
Jensen, Camilla
Weikusat, Ilka
Microstructure, micro-inclusions, and mineralogy along the EGRIP ice core – Part 1: Localisation of inclusions and deformation patterns
topic_facet article
Verlagsveröffentlichung
description Impurities deposited in polar ice enable the reconstruction of the atmospheric aerosol concentration of the past. At the same time they impact the physical properties of the ice itself such as its deformation behaviour. Impurities are thought to enhance ice deformation, but observations are ambiguous due to a shortage of comprehensive microstructural analyses. For the first time, we systematically analyse micro-inclusions in polar fast flowing ice, i.e. from the East Greenland Ice Core Project ice core drilled through the Northeast Greenland Ice Stream. In direct relation to the inclusions we derive the crystal preferred orientation, fabric, grain size, and microstructural features at 10 depths, covering the Holocene and Late Glacial. We use optical microscopy to create microstructure maps to analyse the in situ locations of inclusions in the polycrystalline, solid ice samples. Micro-inclusions are more variable in spatial distribution than previously observed and show various distributional patterns ranging from centimetre-thick layers to clusters and solitary particles, independent of depth. In half of all samples, micro-inclusions are more often located at or close to the grain boundaries by a slight margin (in the areas occupied by grain boundaries). Throughout all samples we find strong indications of dynamic recrystallisation, such as grain islands, bulging grains, and different types of sub-grain boundaries. We discuss the spatial variability in micro-inclusions, the link between spatial variability and mineralogy, and possible effects on the microstructure and deformation behaviour of the ice. Our results emphasise the need for holistic approaches in future studies, combining microstructure and impurity analysis.
format Article in Journal/Newspaper
author Stoll, Nicolas
Eichler, Jan
Hörhold, Maria
Erhardt, Tobias
Jensen, Camilla
Weikusat, Ilka
author_facet Stoll, Nicolas
Eichler, Jan
Hörhold, Maria
Erhardt, Tobias
Jensen, Camilla
Weikusat, Ilka
author_sort Stoll, Nicolas
title Microstructure, micro-inclusions, and mineralogy along the EGRIP ice core – Part 1: Localisation of inclusions and deformation patterns
title_short Microstructure, micro-inclusions, and mineralogy along the EGRIP ice core – Part 1: Localisation of inclusions and deformation patterns
title_full Microstructure, micro-inclusions, and mineralogy along the EGRIP ice core – Part 1: Localisation of inclusions and deformation patterns
title_fullStr Microstructure, micro-inclusions, and mineralogy along the EGRIP ice core – Part 1: Localisation of inclusions and deformation patterns
title_full_unstemmed Microstructure, micro-inclusions, and mineralogy along the EGRIP ice core – Part 1: Localisation of inclusions and deformation patterns
title_sort microstructure, micro-inclusions, and mineralogy along the egrip ice core – part 1: localisation of inclusions and deformation patterns
publisher Copernicus Publications
publishDate 2021
url https://doi.org/10.5194/tc-15-5717-2021
https://noa.gwlb.de/receive/cop_mods_00059663
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059312/tc-15-5717-2021.pdf
https://tc.copernicus.org/articles/15/5717/2021/tc-15-5717-2021.pdf
geographic Greenland
geographic_facet Greenland
genre East Greenland
East Greenland Ice-core Project
Greenland
Greenland ice core
Greenland Ice core Project
ice core
The Cryosphere
genre_facet East Greenland
East Greenland Ice-core Project
Greenland
Greenland ice core
Greenland Ice core Project
ice core
The Cryosphere
op_relation The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424
https://doi.org/10.5194/tc-15-5717-2021
https://noa.gwlb.de/receive/cop_mods_00059663
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00059312/tc-15-5717-2021.pdf
https://tc.copernicus.org/articles/15/5717/2021/tc-15-5717-2021.pdf
op_rights https://creativecommons.org/licenses/by/4.0/
uneingeschränkt
info:eu-repo/semantics/openAccess
op_rightsnorm CC-BY
op_doi https://doi.org/10.5194/tc-15-5717-2021
container_title The Cryosphere
container_volume 15
container_issue 12
container_start_page 5717
op_container_end_page 5737
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