Textures, fabrics and meltlayer stratigraphy in the Hans Tausen ice core, North Greenland - indications of late Holocene ice cap genration? in: (U.C. Hammer, ed.) The Hans Tausen Ice Cap Glaciology and Glacial Geology
A thin section study of crystal structure has been carried out on a 345 m long ice core drilled to bedrock on Hans Tausen Iskappe, 1995. In addition a meltlayer stratigraphy was set up, showing how the fraction of meltlayer-ice in the core increases with depth. Main characteristics of crystal struct...
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ftawi:oai:epic.awi.de:2036 2023-09-05T13:19:53+02:00 Textures, fabrics and meltlayer stratigraphy in the Hans Tausen ice core, North Greenland - indications of late Holocene ice cap genration? in: (U.C. Hammer, ed.) The Hans Tausen Ice Cap Glaciology and Glacial Geology Madsen, K. N. Thorsteinsson, Th. 2001 https://epic.awi.de/id/eprint/2036/ https://hdl.handle.net/10013/epic.12627 unknown Madsen, K. N. and Thorsteinsson, T. (2001) Textures, fabrics and meltlayer stratigraphy in the Hans Tausen ice core, North Greenland - indications of late Holocene ice cap genration? in: (U.C. Hammer, ed.) The Hans Tausen Ice Cap Glaciology and Glacial Geology , Meddelelser om Grønland, Geoscience, 39 , pp. 97-114 . hdl:10013/epic.12627 EPIC3Meddelelser om Grønland, Geoscience, 39, pp. 97-114 Article peerRev 2001 ftawi 2023-08-22T19:43:04Z A thin section study of crystal structure has been carried out on a 345 m long ice core drilled to bedrock on Hans Tausen Iskappe, 1995. In addition a meltlayer stratigraphy was set up, showing how the fraction of meltlayer-ice in the core increases with depth. Main characteristics of crystal structure are increasing mean crystal size from top to bottom in the core and development of a weak single maximum c-axis fabric. The rate of ice crystal growth in the well dated upper half of the core is much lower than expected from studies of the normal grain growth regime in other polar ice cores. Probablythe grain boundary movements are impeded by impurities, which are present in relatively high concentrations in the Hans Tausen ice. Asuming the applicability of the calculated growth rate throughout the core, a late Holocene origin of the oldest ice is suggested by the size of the crystals close to the bedrock.Presented data furthermore implies that bottom ice temperatures were never near the melting point and it is concluded that there was no ice cap on the Hans Tausen plarteau earlier in Holocene. Article in Journal/Newspaper Greenland Hans Tausen iskappe Ice cap ice core North Greenland Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Greenland Hans Tausen Iskappe ENVELOPE(-37.500,-37.500,82.583,82.583) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
A thin section study of crystal structure has been carried out on a 345 m long ice core drilled to bedrock on Hans Tausen Iskappe, 1995. In addition a meltlayer stratigraphy was set up, showing how the fraction of meltlayer-ice in the core increases with depth. Main characteristics of crystal structure are increasing mean crystal size from top to bottom in the core and development of a weak single maximum c-axis fabric. The rate of ice crystal growth in the well dated upper half of the core is much lower than expected from studies of the normal grain growth regime in other polar ice cores. Probablythe grain boundary movements are impeded by impurities, which are present in relatively high concentrations in the Hans Tausen ice. Asuming the applicability of the calculated growth rate throughout the core, a late Holocene origin of the oldest ice is suggested by the size of the crystals close to the bedrock.Presented data furthermore implies that bottom ice temperatures were never near the melting point and it is concluded that there was no ice cap on the Hans Tausen plarteau earlier in Holocene. |
format |
Article in Journal/Newspaper |
author |
Madsen, K. N. Thorsteinsson, Th. |
spellingShingle |
Madsen, K. N. Thorsteinsson, Th. Textures, fabrics and meltlayer stratigraphy in the Hans Tausen ice core, North Greenland - indications of late Holocene ice cap genration? in: (U.C. Hammer, ed.) The Hans Tausen Ice Cap Glaciology and Glacial Geology |
author_facet |
Madsen, K. N. Thorsteinsson, Th. |
author_sort |
Madsen, K. N. |
title |
Textures, fabrics and meltlayer stratigraphy in the Hans Tausen ice core, North Greenland - indications of late Holocene ice cap genration? in: (U.C. Hammer, ed.) The Hans Tausen Ice Cap Glaciology and Glacial Geology |
title_short |
Textures, fabrics and meltlayer stratigraphy in the Hans Tausen ice core, North Greenland - indications of late Holocene ice cap genration? in: (U.C. Hammer, ed.) The Hans Tausen Ice Cap Glaciology and Glacial Geology |
title_full |
Textures, fabrics and meltlayer stratigraphy in the Hans Tausen ice core, North Greenland - indications of late Holocene ice cap genration? in: (U.C. Hammer, ed.) The Hans Tausen Ice Cap Glaciology and Glacial Geology |
title_fullStr |
Textures, fabrics and meltlayer stratigraphy in the Hans Tausen ice core, North Greenland - indications of late Holocene ice cap genration? in: (U.C. Hammer, ed.) The Hans Tausen Ice Cap Glaciology and Glacial Geology |
title_full_unstemmed |
Textures, fabrics and meltlayer stratigraphy in the Hans Tausen ice core, North Greenland - indications of late Holocene ice cap genration? in: (U.C. Hammer, ed.) The Hans Tausen Ice Cap Glaciology and Glacial Geology |
title_sort |
textures, fabrics and meltlayer stratigraphy in the hans tausen ice core, north greenland - indications of late holocene ice cap genration? in: (u.c. hammer, ed.) the hans tausen ice cap glaciology and glacial geology |
publishDate |
2001 |
url |
https://epic.awi.de/id/eprint/2036/ https://hdl.handle.net/10013/epic.12627 |
long_lat |
ENVELOPE(-37.500,-37.500,82.583,82.583) |
geographic |
Greenland Hans Tausen Iskappe |
geographic_facet |
Greenland Hans Tausen Iskappe |
genre |
Greenland Hans Tausen iskappe Ice cap ice core North Greenland |
genre_facet |
Greenland Hans Tausen iskappe Ice cap ice core North Greenland |
op_source |
EPIC3Meddelelser om Grønland, Geoscience, 39, pp. 97-114 |
op_relation |
Madsen, K. N. and Thorsteinsson, T. (2001) Textures, fabrics and meltlayer stratigraphy in the Hans Tausen ice core, North Greenland - indications of late Holocene ice cap genration? in: (U.C. Hammer, ed.) The Hans Tausen Ice Cap Glaciology and Glacial Geology , Meddelelser om Grønland, Geoscience, 39 , pp. 97-114 . hdl:10013/epic.12627 |
_version_ |
1776200680088797184 |