Ice Core Colle Gnifetti KCC
We analysed crystal-preferred orientation of c-axis and microstructure data from the Alpine ice core KCC at an unprecedented resolution and coverage of any Alpine ice core. We find that an anisotropic single-maximum fabric develops as early as 25 m depth in firn under vertical compression and streng...
Main Authors: | , , , , , , |
---|---|
Format: | Other/Unknown Material |
Language: | English |
Published: |
PANGAEA
2018
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.887838 https://doi.org/10.1594/PANGAEA.887838 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.887838 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.887838 2024-09-15T18:11:53+00:00 Ice Core Colle Gnifetti KCC Kerch, Johanna Eisen, Olaf Eichler, Jan Binder, Tobias Freitag, Johannes Bohleber, Pascal Weikusat, Ilka LATITUDE: 45.928930 * LONGITUDE: 7.876260 * DATE/TIME START: 2013-08-04T00:00:00 * DATE/TIME END: 2013-08-11T00:00:00 2018 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.887838 https://doi.org/10.1594/PANGAEA.887838 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.887838 https://doi.org/10.1594/PANGAEA.887838 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Kerch, Johanna; Eisen, Olaf; Eichler, Jan; Binder, Tobias; Freitag, Johannes; Bohleber, Pascal; Bons, Paul D; Weikusat, Ilka (2020): Short-scale variations in high-resolution crystal-preferred orientation data in an alpine ice core - do we need a new statistical approach? Earth and Space Science Open Archive (ESSOAr), https://doi.org/10.1002/essoar.10503278.1 AWI_Glac Glaciology @ AWI dataset publication series 2018 ftpangaea https://doi.org/10.1594/PANGAEA.88783810.1002/essoar.10503278.1 2024-07-24T02:31:21Z We analysed crystal-preferred orientation of c-axis and microstructure data from the Alpine ice core KCC at an unprecedented resolution and coverage of any Alpine ice core. We find that an anisotropic single-maximum fabric develops as early as 25 m depth in firn under vertical compression and strengthens under simple shear conditions towards the bedrock at 72 m depth. The analysis of continuously measured intervals with subsequent thin section samples from several depths of the ice core reveals a high spatial variability in the crystal orientation and crystal size on the 10 cm-scale as well as within a few centimeters. We quantify the variability and investigate the possible causes and links to other microstructural properties. Our findings support the hypothesis that the observed variability is a consequence of strain localisation on small spatial scales with influence on fabric and microstructure. From a methodological perspective, the results of this study lead us to challenge whether single thin sections from ice cores provide representative parameters for their depth to be used to infer the fabric development in a glacier on the large scale. Previously proposed uncertainty estimates for fabric and grain size parameters do not capture the observed variability. This might therefore demand a new scale-sensitive statistical approach. Other/Unknown Material ice core PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(7.876260,7.876260,45.928930,45.928930) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AWI_Glac Glaciology @ AWI |
spellingShingle |
AWI_Glac Glaciology @ AWI Kerch, Johanna Eisen, Olaf Eichler, Jan Binder, Tobias Freitag, Johannes Bohleber, Pascal Weikusat, Ilka Ice Core Colle Gnifetti KCC |
topic_facet |
AWI_Glac Glaciology @ AWI |
description |
We analysed crystal-preferred orientation of c-axis and microstructure data from the Alpine ice core KCC at an unprecedented resolution and coverage of any Alpine ice core. We find that an anisotropic single-maximum fabric develops as early as 25 m depth in firn under vertical compression and strengthens under simple shear conditions towards the bedrock at 72 m depth. The analysis of continuously measured intervals with subsequent thin section samples from several depths of the ice core reveals a high spatial variability in the crystal orientation and crystal size on the 10 cm-scale as well as within a few centimeters. We quantify the variability and investigate the possible causes and links to other microstructural properties. Our findings support the hypothesis that the observed variability is a consequence of strain localisation on small spatial scales with influence on fabric and microstructure. From a methodological perspective, the results of this study lead us to challenge whether single thin sections from ice cores provide representative parameters for their depth to be used to infer the fabric development in a glacier on the large scale. Previously proposed uncertainty estimates for fabric and grain size parameters do not capture the observed variability. This might therefore demand a new scale-sensitive statistical approach. |
format |
Other/Unknown Material |
author |
Kerch, Johanna Eisen, Olaf Eichler, Jan Binder, Tobias Freitag, Johannes Bohleber, Pascal Weikusat, Ilka |
author_facet |
Kerch, Johanna Eisen, Olaf Eichler, Jan Binder, Tobias Freitag, Johannes Bohleber, Pascal Weikusat, Ilka |
author_sort |
Kerch, Johanna |
title |
Ice Core Colle Gnifetti KCC |
title_short |
Ice Core Colle Gnifetti KCC |
title_full |
Ice Core Colle Gnifetti KCC |
title_fullStr |
Ice Core Colle Gnifetti KCC |
title_full_unstemmed |
Ice Core Colle Gnifetti KCC |
title_sort |
ice core colle gnifetti kcc |
publisher |
PANGAEA |
publishDate |
2018 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.887838 https://doi.org/10.1594/PANGAEA.887838 |
op_coverage |
LATITUDE: 45.928930 * LONGITUDE: 7.876260 * DATE/TIME START: 2013-08-04T00:00:00 * DATE/TIME END: 2013-08-11T00:00:00 |
long_lat |
ENVELOPE(7.876260,7.876260,45.928930,45.928930) |
genre |
ice core |
genre_facet |
ice core |
op_source |
Supplement to: Kerch, Johanna; Eisen, Olaf; Eichler, Jan; Binder, Tobias; Freitag, Johannes; Bohleber, Pascal; Bons, Paul D; Weikusat, Ilka (2020): Short-scale variations in high-resolution crystal-preferred orientation data in an alpine ice core - do we need a new statistical approach? Earth and Space Science Open Archive (ESSOAr), https://doi.org/10.1002/essoar.10503278.1 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.887838 https://doi.org/10.1594/PANGAEA.887838 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.88783810.1002/essoar.10503278.1 |
_version_ |
1810449464870043648 |