Chemical and visual characterisation of EGRIP glacial ice and cloudy bands within
Impurities in polar ice play a critical role in ice flow, deformation, and the integrity of the ice core record. Especially cloudy bands, visible layers with high impurity concentrations, are prominent features in ice from glacial periods. Their physical and chemical properties are poorly understood...
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Online Access: | https://hdl.handle.net/10278/5024240 https://doi.org/10.5194/tc-17-2021-2023 |
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ftuniveneziairis:oai:iris.unive.it:10278/5024240 2024-06-23T07:52:27+00:00 Chemical and visual characterisation of EGRIP glacial ice and cloudy bands within Stoll N. Westhoff J. Bohleber P. Svensson A. Dahl-Jensen D. Barbante C. Weikusat I. Stoll, N. Westhoff, J. Bohleber, P. Svensson, A. Dahl-Jensen, D. Barbante, C. Weikusat, I. 2023 https://hdl.handle.net/10278/5024240 https://doi.org/10.5194/tc-17-2021-2023 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000986809200001 volume:17 issue:5 firstpage:2021 lastpage:2043 numberofpages:23 journal:THE CRYOSPHERE info:eu-repo/grantAgreement/EC/H2020/101018266 https://hdl.handle.net/10278/5024240 doi:10.5194/tc-17-2021-2023 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85160955087 info:eu-repo/semantics/openAccess Settore GEO/08 - Geochimica e Vulcanologia info:eu-repo/semantics/article 2023 ftuniveneziairis https://doi.org/10.5194/tc-17-2021-2023 2024-06-10T23:47:12Z Impurities in polar ice play a critical role in ice flow, deformation, and the integrity of the ice core record. Especially cloudy bands, visible layers with high impurity concentrations, are prominent features in ice from glacial periods. Their physical and chemical properties are poorly understood, highlighting the need to analyse them in more detail. We bridge the gap between decimetre and micrometre scales by combining the visual stratigraphy line scanner, fabric analyser, microstructure mapping, Raman spectroscopy, and laser ablation inductively coupled plasma mass spectrometry 2D impurity imaging. We classified approximately 1300 cloudy bands from glacial ice from the East Greenland Ice-core Project (EGRIP) ice core into seven different types. We determine the localisation and mineralogy of more than 1000 micro-inclusions at 13 depths. The majority of the minerals found are related to terrestrial dust, such as quartz, feldspar, mica, and hematite. We further found carbonaceous particles, dolomite, and gypsum in high abundance. Rutile, anatase, epidote, titanite, and grossular are infrequently observed. The 2D impurity imaging at 20μm resolution revealed that cloudy bands are clearly distinguishable in the chemical data. Na, Mg, and Sr are mainly present at grain boundaries, whereas dust-related analytes, such as Al, Fe, and Ti, are located in the grain interior, forming clusters of insoluble impurities. We present novel vast micrometre-resolution insights into cloudy bands and describe the differences within and outside these bands. Combining the visual and chemical data results in new insights into the formation of different cloudy band types and could be the starting point for future in-depth studies on impurity signal integrity and internal deformation in deep polar ice cores. Article in Journal/Newspaper East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Greenland The Cryosphere 17 5 2021 2043 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
Settore GEO/08 - Geochimica e Vulcanologia |
spellingShingle |
Settore GEO/08 - Geochimica e Vulcanologia Stoll N. Westhoff J. Bohleber P. Svensson A. Dahl-Jensen D. Barbante C. Weikusat I. Chemical and visual characterisation of EGRIP glacial ice and cloudy bands within |
topic_facet |
Settore GEO/08 - Geochimica e Vulcanologia |
description |
Impurities in polar ice play a critical role in ice flow, deformation, and the integrity of the ice core record. Especially cloudy bands, visible layers with high impurity concentrations, are prominent features in ice from glacial periods. Their physical and chemical properties are poorly understood, highlighting the need to analyse them in more detail. We bridge the gap between decimetre and micrometre scales by combining the visual stratigraphy line scanner, fabric analyser, microstructure mapping, Raman spectroscopy, and laser ablation inductively coupled plasma mass spectrometry 2D impurity imaging. We classified approximately 1300 cloudy bands from glacial ice from the East Greenland Ice-core Project (EGRIP) ice core into seven different types. We determine the localisation and mineralogy of more than 1000 micro-inclusions at 13 depths. The majority of the minerals found are related to terrestrial dust, such as quartz, feldspar, mica, and hematite. We further found carbonaceous particles, dolomite, and gypsum in high abundance. Rutile, anatase, epidote, titanite, and grossular are infrequently observed. The 2D impurity imaging at 20μm resolution revealed that cloudy bands are clearly distinguishable in the chemical data. Na, Mg, and Sr are mainly present at grain boundaries, whereas dust-related analytes, such as Al, Fe, and Ti, are located in the grain interior, forming clusters of insoluble impurities. We present novel vast micrometre-resolution insights into cloudy bands and describe the differences within and outside these bands. Combining the visual and chemical data results in new insights into the formation of different cloudy band types and could be the starting point for future in-depth studies on impurity signal integrity and internal deformation in deep polar ice cores. |
author2 |
Stoll, N. Westhoff, J. Bohleber, P. Svensson, A. Dahl-Jensen, D. Barbante, C. Weikusat, I. |
format |
Article in Journal/Newspaper |
author |
Stoll N. Westhoff J. Bohleber P. Svensson A. Dahl-Jensen D. Barbante C. Weikusat I. |
author_facet |
Stoll N. Westhoff J. Bohleber P. Svensson A. Dahl-Jensen D. Barbante C. Weikusat I. |
author_sort |
Stoll N. |
title |
Chemical and visual characterisation of EGRIP glacial ice and cloudy bands within |
title_short |
Chemical and visual characterisation of EGRIP glacial ice and cloudy bands within |
title_full |
Chemical and visual characterisation of EGRIP glacial ice and cloudy bands within |
title_fullStr |
Chemical and visual characterisation of EGRIP glacial ice and cloudy bands within |
title_full_unstemmed |
Chemical and visual characterisation of EGRIP glacial ice and cloudy bands within |
title_sort |
chemical and visual characterisation of egrip glacial ice and cloudy bands within |
publishDate |
2023 |
url |
https://hdl.handle.net/10278/5024240 https://doi.org/10.5194/tc-17-2021-2023 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core |
genre_facet |
East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000986809200001 volume:17 issue:5 firstpage:2021 lastpage:2043 numberofpages:23 journal:THE CRYOSPHERE info:eu-repo/grantAgreement/EC/H2020/101018266 https://hdl.handle.net/10278/5024240 doi:10.5194/tc-17-2021-2023 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85160955087 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-17-2021-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
5 |
container_start_page |
2021 |
op_container_end_page |
2043 |
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1802643744509394944 |