Microstructure, Micro-inclusions and Mineralogy along the EGRIP ice core – Part 2: Implications for paleo-mineralogy
Impurities in polar ice do not only allow the reconstruction of past atmospheric aerosol concentration, but also in- fluence the physical properties of the ice. However, the mineralogy and location of impurities in ice and the involved processes are poorly understood. We use Continuous Flow Analysis...
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ftcopernicus:oai:publications.copernicus.org:tcd95688 2023-05-15T16:03:51+02:00 Microstructure, Micro-inclusions and Mineralogy along the EGRIP ice core – Part 2: Implications for paleo-mineralogy Stoll, Nicolas Hörhold, Maria Erhardt, Tobias Eichler, Jan Jensen, Camilla Weikusat, Ilka 2021-07-06 application/pdf https://doi.org/10.5194/tc-2021-190 https://tc.copernicus.org/preprints/tc-2021-190/ eng eng doi:10.5194/tc-2021-190 https://tc.copernicus.org/preprints/tc-2021-190/ eISSN: 1994-0424 Text 2021 ftcopernicus https://doi.org/10.5194/tc-2021-190 2021-07-12T16:22:16Z Impurities in polar ice do not only allow the reconstruction of past atmospheric aerosol concentration, but also in- fluence the physical properties of the ice. However, the mineralogy and location of impurities in ice and the involved processes are poorly understood. We use Continuous Flow Analysis to derive the dust particle concentration and optical microscopy and Cryo-Raman spectroscopy to systematically locate and analyse the mineralogy of micro-inclusions in situ inside eleven solid ice samples from the upper 1340 m of the East Greenland Ice Core Project ice core. Micro-inclusions are more variable in min- eralogy than previously observed and are mainly composed of mineral dust (quartz, mica and feldspar) and sulphates (mainly gypsum). Inclusions of the same composition tend to cluster, but clustering frequency and mineralogy changes considerably with depth. A variety of sulphates dominate the upper 900 m while gypsum is the only sulphate in deeper samples, which however contain more mineral dust, nitrates and dolomite. The analysed part of the core can thus be divided into two depth regimes of different mineralogy, and to a lesser degree of spatial distribution, which could originate from different chemical reactions in the ice or large-scale changes of ice cover in NE-Greenland during the Mid-Holocene. The complexity of impurity mineralogy on the metre- and centimetre-scale in polar ice is still underestimated and new methodological approaches are necessary to establish a comprehensive understanding of the role of impurities. Text East Greenland East Greenland Ice-core Project Greenland Greenland ice core Greenland Ice core Project ice core Copernicus Publications: E-Journals Greenland |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Impurities in polar ice do not only allow the reconstruction of past atmospheric aerosol concentration, but also in- fluence the physical properties of the ice. However, the mineralogy and location of impurities in ice and the involved processes are poorly understood. We use Continuous Flow Analysis to derive the dust particle concentration and optical microscopy and Cryo-Raman spectroscopy to systematically locate and analyse the mineralogy of micro-inclusions in situ inside eleven solid ice samples from the upper 1340 m of the East Greenland Ice Core Project ice core. Micro-inclusions are more variable in min- eralogy than previously observed and are mainly composed of mineral dust (quartz, mica and feldspar) and sulphates (mainly gypsum). Inclusions of the same composition tend to cluster, but clustering frequency and mineralogy changes considerably with depth. A variety of sulphates dominate the upper 900 m while gypsum is the only sulphate in deeper samples, which however contain more mineral dust, nitrates and dolomite. The analysed part of the core can thus be divided into two depth regimes of different mineralogy, and to a lesser degree of spatial distribution, which could originate from different chemical reactions in the ice or large-scale changes of ice cover in NE-Greenland during the Mid-Holocene. The complexity of impurity mineralogy on the metre- and centimetre-scale in polar ice is still underestimated and new methodological approaches are necessary to establish a comprehensive understanding of the role of impurities. |
format |
Text |
author |
Stoll, Nicolas Hörhold, Maria Erhardt, Tobias Eichler, Jan Jensen, Camilla Weikusat, Ilka |
spellingShingle |
Stoll, Nicolas Hörhold, Maria Erhardt, Tobias Eichler, Jan Jensen, Camilla Weikusat, Ilka Microstructure, Micro-inclusions and Mineralogy along the EGRIP ice core – Part 2: Implications for paleo-mineralogy |
author_facet |
Stoll, Nicolas Hörhold, Maria Erhardt, Tobias Eichler, Jan Jensen, Camilla Weikusat, Ilka |
author_sort |
Stoll, Nicolas |
title |
Microstructure, Micro-inclusions and Mineralogy along the EGRIP ice core – Part 2: Implications for paleo-mineralogy |
title_short |
Microstructure, Micro-inclusions and Mineralogy along the EGRIP ice core – Part 2: Implications for paleo-mineralogy |
title_full |
Microstructure, Micro-inclusions and Mineralogy along the EGRIP ice core – Part 2: Implications for paleo-mineralogy |
title_fullStr |
Microstructure, Micro-inclusions and Mineralogy along the EGRIP ice core – Part 2: Implications for paleo-mineralogy |
title_full_unstemmed |
Microstructure, Micro-inclusions and Mineralogy along the EGRIP ice core – Part 2: Implications for paleo-mineralogy |
title_sort |
microstructure, micro-inclusions and mineralogy along the egrip ice core – part 2: implications for paleo-mineralogy |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-2021-190 https://tc.copernicus.org/preprints/tc-2021-190/ |
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_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2021-190 https://tc.copernicus.org/preprints/tc-2021-190/ |
op_doi |
https://doi.org/10.5194/tc-2021-190 |
_version_ |
1766399545940377600 |