High-resolution hydrothermal structure of Hansbreen, Spitsbergen, mapped by ground-penetrating radar
Detailed ground-penetrating radar (GPR) surveys at 50 and 200 MHz on Hansbreen, a polythermal glacier in southern Svalbard, are presented and interpreted. Comparison of the variations in character of the radar reflections with borehole thermometry and water levels in moulins suggests that GPR can be...
Main Authors: | , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
1999
|
Subjects: | |
Online Access: | https://research.ulapland.fi/fi/publications/f7a746c0-e24c-425c-82db-a5f4fa043507 |
id |
ftulaplandcdispu:oai:lacris.ulapland.fi:publications/f7a746c0-e24c-425c-82db-a5f4fa043507 |
---|---|
record_format |
openpolar |
spelling |
ftulaplandcdispu:oai:lacris.ulapland.fi:publications/f7a746c0-e24c-425c-82db-a5f4fa043507 2024-04-28T08:20:14+00:00 High-resolution hydrothermal structure of Hansbreen, Spitsbergen, mapped by ground-penetrating radar Moore, J. C. Pälli, A. Ludwig, F. Blatter, H. Jania, J. Gadek, B. Glowacki, P. Mochnacki, D. Isaksson, E. 1999 https://research.ulapland.fi/fi/publications/f7a746c0-e24c-425c-82db-a5f4fa043507 eng eng https://research.ulapland.fi/fi/publications/f7a746c0-e24c-425c-82db-a5f4fa043507 info:eu-repo/semantics/restrictedAccess Moore , J C , Pälli , A , Ludwig , F , Blatter , H , Jania , J , Gadek , B , Glowacki , P , Mochnacki , D & Isaksson , E 1999 , ' High-resolution hydrothermal structure of Hansbreen, Spitsbergen, mapped by ground-penetrating radar ' , Journal of Glaciology , vol. 45 , no. 151 , pp. 524-532 . /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences article 1999 ftulaplandcdispu 2024-04-01T16:48:57Z Detailed ground-penetrating radar (GPR) surveys at 50 and 200 MHz on Hansbreen, a polythermal glacier in southern Svalbard, are presented and interpreted. Comparison of the variations in character of the radar reflections with borehole thermometry and water levels in moulins suggests that GPR can be used to study the hydrothermal properties of the glacier. The high resolution of the GPR data shows that the hydrothermal structure of the glacier is highly variable both along the centre line and on transverse profiles. Water contents for many places and depths within the glacier were calculated by estimating radar-wave velocities to point reflectors. We find typical water contents of 1-2% for the temperate ice, but wetter ice associated with surface crevassing and moulins (typically 4% water content). There is evidence that wet ice sometimes overlays drier ice. The hydrothermal structure is thus shown to be very complex. Temperature gradients in the cold ice indicate freezing rates of temperate ice below cold ice of 0.1-0.5 m a-1, while isolated point reflectors within the cold ice indicate large water-filled bodies that are probably related to the regular drainage structure of the glacier. Article in Journal/Newspaper glacier Journal of Glaciology Svalbard Spitsbergen LaCRIS - University of Lapland Current Research System |
institution |
Open Polar |
collection |
LaCRIS - University of Lapland Current Research System |
op_collection_id |
ftulaplandcdispu |
language |
English |
topic |
/dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences |
spellingShingle |
/dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences Moore, J. C. Pälli, A. Ludwig, F. Blatter, H. Jania, J. Gadek, B. Glowacki, P. Mochnacki, D. Isaksson, E. High-resolution hydrothermal structure of Hansbreen, Spitsbergen, mapped by ground-penetrating radar |
topic_facet |
/dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences |
description |
Detailed ground-penetrating radar (GPR) surveys at 50 and 200 MHz on Hansbreen, a polythermal glacier in southern Svalbard, are presented and interpreted. Comparison of the variations in character of the radar reflections with borehole thermometry and water levels in moulins suggests that GPR can be used to study the hydrothermal properties of the glacier. The high resolution of the GPR data shows that the hydrothermal structure of the glacier is highly variable both along the centre line and on transverse profiles. Water contents for many places and depths within the glacier were calculated by estimating radar-wave velocities to point reflectors. We find typical water contents of 1-2% for the temperate ice, but wetter ice associated with surface crevassing and moulins (typically 4% water content). There is evidence that wet ice sometimes overlays drier ice. The hydrothermal structure is thus shown to be very complex. Temperature gradients in the cold ice indicate freezing rates of temperate ice below cold ice of 0.1-0.5 m a-1, while isolated point reflectors within the cold ice indicate large water-filled bodies that are probably related to the regular drainage structure of the glacier. |
format |
Article in Journal/Newspaper |
author |
Moore, J. C. Pälli, A. Ludwig, F. Blatter, H. Jania, J. Gadek, B. Glowacki, P. Mochnacki, D. Isaksson, E. |
author_facet |
Moore, J. C. Pälli, A. Ludwig, F. Blatter, H. Jania, J. Gadek, B. Glowacki, P. Mochnacki, D. Isaksson, E. |
author_sort |
Moore, J. C. |
title |
High-resolution hydrothermal structure of Hansbreen, Spitsbergen, mapped by ground-penetrating radar |
title_short |
High-resolution hydrothermal structure of Hansbreen, Spitsbergen, mapped by ground-penetrating radar |
title_full |
High-resolution hydrothermal structure of Hansbreen, Spitsbergen, mapped by ground-penetrating radar |
title_fullStr |
High-resolution hydrothermal structure of Hansbreen, Spitsbergen, mapped by ground-penetrating radar |
title_full_unstemmed |
High-resolution hydrothermal structure of Hansbreen, Spitsbergen, mapped by ground-penetrating radar |
title_sort |
high-resolution hydrothermal structure of hansbreen, spitsbergen, mapped by ground-penetrating radar |
publishDate |
1999 |
url |
https://research.ulapland.fi/fi/publications/f7a746c0-e24c-425c-82db-a5f4fa043507 |
genre |
glacier Journal of Glaciology Svalbard Spitsbergen |
genre_facet |
glacier Journal of Glaciology Svalbard Spitsbergen |
op_source |
Moore , J C , Pälli , A , Ludwig , F , Blatter , H , Jania , J , Gadek , B , Glowacki , P , Mochnacki , D & Isaksson , E 1999 , ' High-resolution hydrothermal structure of Hansbreen, Spitsbergen, mapped by ground-penetrating radar ' , Journal of Glaciology , vol. 45 , no. 151 , pp. 524-532 . |
op_relation |
https://research.ulapland.fi/fi/publications/f7a746c0-e24c-425c-82db-a5f4fa043507 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1797583240852144128 |