Quantification of dead-ice melting in ice-cored moraines at the high-Arctic glacier Holmströmbreen, Svalbard
Abstract in UndeterminedAn extensive dead-ice area has developed at the stagnant snout of the Holmstrombreen glacier, Svalbard, following its last advance during the Little Ice Age (LIA). The most common landform is ice-cored slopes hosting sediment gravity flows. Dead-ice melting is described and q...
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Language: | English |
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John Wiley & Sons Inc.
2008
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Online Access: | https://lup.lub.lu.se/record/634300 https://doi.org/10.1111/j.1502-3885.2007.00014.x |
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ftulundlup:oai:lup.lub.lu.se:2483b6d2-2172-4a68-97d9-5d6434b4e15a 2023-05-15T14:58:33+02:00 Quantification of dead-ice melting in ice-cored moraines at the high-Arctic glacier Holmströmbreen, Svalbard Schomacker, Anders Kjær, Kurt H. 2008 https://lup.lub.lu.se/record/634300 https://doi.org/10.1111/j.1502-3885.2007.00014.x eng eng John Wiley & Sons Inc. https://lup.lub.lu.se/record/634300 http://dx.doi.org/10.1111/j.1502-3885.2007.00014.x wos:000254932200003 scopus:55549126516 Boreas; 37(2), pp 211-225 (2008) ISSN: 1502-3885 Geology contributiontojournal/article info:eu-repo/semantics/article text 2008 ftulundlup https://doi.org/10.1111/j.1502-3885.2007.00014.x 2023-02-01T23:28:28Z Abstract in UndeterminedAn extensive dead-ice area has developed at the stagnant snout of the Holmstrombreen glacier, Svalbard, following its last advance during the Little Ice Age (LIA). The most common landform is ice-cored slopes hosting sediment gravity flows. Dead-ice melting is described and quantified through field studies and analyses of high-resolution, multi-temporal aerial photographs and QuickBird 2 satellite imagery. Field measurements of backwasting of ice-cored slopes indicate melting rates of 9.2 cm/day. Downwasting rates reveal a dead-ice surface lowering of 0.9 m/yr from 1984 to 2004. The volume of melted dead-ice in the marginal zone since the LIA is estimated at 2.72 km(3). Most prominently, dead-ice melting causes the growth of an ice-walled lake with an area increasing near-exponentially over the last 40 years. Despite the high-Arctic setting, dead-ice melting progresses with similar rates as in humid sub-polar climates, stressing that melt rates are governed by processes and topography rather than climate. We suggest that the permafrost and lack of glacier karst prevent meltwater percolation, thus maintaining a liquefied debris-cover where new dead-ice is continuously exposed to melting. As long as backwasting and mass movement processes prevent build-up of an insulating debris-cover, the de-icing continues despite the continuous permafrost. Article in Journal/Newspaper Arctic glacier Ice permafrost Svalbard Lund University Publications (LUP) Arctic Holmströmbreen ENVELOPE(14.103,14.103,78.831,78.831) Svalbard Boreas 37 2 211 225 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology |
spellingShingle |
Geology Schomacker, Anders Kjær, Kurt H. Quantification of dead-ice melting in ice-cored moraines at the high-Arctic glacier Holmströmbreen, Svalbard |
topic_facet |
Geology |
description |
Abstract in UndeterminedAn extensive dead-ice area has developed at the stagnant snout of the Holmstrombreen glacier, Svalbard, following its last advance during the Little Ice Age (LIA). The most common landform is ice-cored slopes hosting sediment gravity flows. Dead-ice melting is described and quantified through field studies and analyses of high-resolution, multi-temporal aerial photographs and QuickBird 2 satellite imagery. Field measurements of backwasting of ice-cored slopes indicate melting rates of 9.2 cm/day. Downwasting rates reveal a dead-ice surface lowering of 0.9 m/yr from 1984 to 2004. The volume of melted dead-ice in the marginal zone since the LIA is estimated at 2.72 km(3). Most prominently, dead-ice melting causes the growth of an ice-walled lake with an area increasing near-exponentially over the last 40 years. Despite the high-Arctic setting, dead-ice melting progresses with similar rates as in humid sub-polar climates, stressing that melt rates are governed by processes and topography rather than climate. We suggest that the permafrost and lack of glacier karst prevent meltwater percolation, thus maintaining a liquefied debris-cover where new dead-ice is continuously exposed to melting. As long as backwasting and mass movement processes prevent build-up of an insulating debris-cover, the de-icing continues despite the continuous permafrost. |
format |
Article in Journal/Newspaper |
author |
Schomacker, Anders Kjær, Kurt H. |
author_facet |
Schomacker, Anders Kjær, Kurt H. |
author_sort |
Schomacker, Anders |
title |
Quantification of dead-ice melting in ice-cored moraines at the high-Arctic glacier Holmströmbreen, Svalbard |
title_short |
Quantification of dead-ice melting in ice-cored moraines at the high-Arctic glacier Holmströmbreen, Svalbard |
title_full |
Quantification of dead-ice melting in ice-cored moraines at the high-Arctic glacier Holmströmbreen, Svalbard |
title_fullStr |
Quantification of dead-ice melting in ice-cored moraines at the high-Arctic glacier Holmströmbreen, Svalbard |
title_full_unstemmed |
Quantification of dead-ice melting in ice-cored moraines at the high-Arctic glacier Holmströmbreen, Svalbard |
title_sort |
quantification of dead-ice melting in ice-cored moraines at the high-arctic glacier holmströmbreen, svalbard |
publisher |
John Wiley & Sons Inc. |
publishDate |
2008 |
url |
https://lup.lub.lu.se/record/634300 https://doi.org/10.1111/j.1502-3885.2007.00014.x |
long_lat |
ENVELOPE(14.103,14.103,78.831,78.831) |
geographic |
Arctic Holmströmbreen Svalbard |
geographic_facet |
Arctic Holmströmbreen Svalbard |
genre |
Arctic glacier Ice permafrost Svalbard |
genre_facet |
Arctic glacier Ice permafrost Svalbard |
op_source |
Boreas; 37(2), pp 211-225 (2008) ISSN: 1502-3885 |
op_relation |
https://lup.lub.lu.se/record/634300 http://dx.doi.org/10.1111/j.1502-3885.2007.00014.x wos:000254932200003 scopus:55549126516 |
op_doi |
https://doi.org/10.1111/j.1502-3885.2007.00014.x |
container_title |
Boreas |
container_volume |
37 |
container_issue |
2 |
container_start_page |
211 |
op_container_end_page |
225 |
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1766330695323484160 |