Utilizing physical sediment variability in glacier-fed lakes for continuous glacier reconstructions during the Holocene, northern Folgefonna, western Norway
The maritime plateau glacier of northern Folgefonna in western Norway has a short (subdecadal) response time to climatic shifts, and is therefore well suited for reconstructing high-resolution glacier fluctuations. The reconstruction presented here is based on physical parameters of glaciolacustrine...
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Online Access: | http://dx.doi.org/10.1191/0959683605hl797rp https://journals.sagepub.com/doi/pdf/10.1191/0959683605hl797rp |
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crsagepubl:10.1191/0959683605hl797rp 2024-10-20T14:08:53+00:00 Utilizing physical sediment variability in glacier-fed lakes for continuous glacier reconstructions during the Holocene, northern Folgefonna, western Norway Bakke, Jostein Lie, øyvind Nesje, Atle Dahl, Svein Olaf Paasche, øyvind 2005 http://dx.doi.org/10.1191/0959683605hl797rp https://journals.sagepub.com/doi/pdf/10.1191/0959683605hl797rp en eng SAGE Publications https://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 15, issue 2, page 161-176 ISSN 0959-6836 1477-0911 journal-article 2005 crsagepubl https://doi.org/10.1191/0959683605hl797rp 2024-09-24T04:11:57Z The maritime plateau glacier of northern Folgefonna in western Norway has a short (subdecadal) response time to climatic shifts, and is therefore well suited for reconstructing high-resolution glacier fluctuations. The reconstruction presented here is based on physical parameters of glaciolacustrine sediments retrieved from two glacier-fed lakes and a peat bog north of the ice cap. Bulk density and modelled glacier net mass balance for the last 200 years show a remarkably similar pattern, where maximum sediment yield lags the glacier net mass balance by-10 years. The record of glacier variations has been transferred into an equilibrium-line altitude (ELA) variation curve. Glaciers respond primarily to changes in summer temperature and winter precipitation. At present there is a high correlation between the North Atlantic Oscillation (NAO) index and measured (since the early 1960s) net mass balance on maritime glaciers in western Norway (r=-0.8). Reconstructed glacier variations from maritime western Norway are therefore considered indicative of the strength of the westerly airflow associated with NAO during the Holocene. The early phase of mid-Holocene glacier growth (5200 cal. yr BP) was characterized by gradual glacier expansion culminating in the first Subatlantic glacial event at 2300 cal. yr BP The climate during the last 2200 years has favoured increased glacier activity at Folgefonna. High-amplitude shifts in ELA may be explained by unstable modes of the westerlies causing significant variability of winter precipitation. During the last 2000 years, Folgefonna expanded and decayed with significant decadal variability. During the latest period of the‘Mediaeval Warm Epoch’, Folgefonna advanced. The Neoglacial maximum, however, was reached during the‘Little Ice Age’ at AD 1750 and AD 1870. The northern Folgefonna glacial record is compared to other Holocene glacier records in Scandinavia. Article in Journal/Newspaper glacier Ice cap North Atlantic North Atlantic oscillation SAGE Publications Ela ENVELOPE(9.642,9.642,63.170,63.170) Norway The Holocene 15 2 161 176 |
institution |
Open Polar |
collection |
SAGE Publications |
op_collection_id |
crsagepubl |
language |
English |
description |
The maritime plateau glacier of northern Folgefonna in western Norway has a short (subdecadal) response time to climatic shifts, and is therefore well suited for reconstructing high-resolution glacier fluctuations. The reconstruction presented here is based on physical parameters of glaciolacustrine sediments retrieved from two glacier-fed lakes and a peat bog north of the ice cap. Bulk density and modelled glacier net mass balance for the last 200 years show a remarkably similar pattern, where maximum sediment yield lags the glacier net mass balance by-10 years. The record of glacier variations has been transferred into an equilibrium-line altitude (ELA) variation curve. Glaciers respond primarily to changes in summer temperature and winter precipitation. At present there is a high correlation between the North Atlantic Oscillation (NAO) index and measured (since the early 1960s) net mass balance on maritime glaciers in western Norway (r=-0.8). Reconstructed glacier variations from maritime western Norway are therefore considered indicative of the strength of the westerly airflow associated with NAO during the Holocene. The early phase of mid-Holocene glacier growth (5200 cal. yr BP) was characterized by gradual glacier expansion culminating in the first Subatlantic glacial event at 2300 cal. yr BP The climate during the last 2200 years has favoured increased glacier activity at Folgefonna. High-amplitude shifts in ELA may be explained by unstable modes of the westerlies causing significant variability of winter precipitation. During the last 2000 years, Folgefonna expanded and decayed with significant decadal variability. During the latest period of the‘Mediaeval Warm Epoch’, Folgefonna advanced. The Neoglacial maximum, however, was reached during the‘Little Ice Age’ at AD 1750 and AD 1870. The northern Folgefonna glacial record is compared to other Holocene glacier records in Scandinavia. |
format |
Article in Journal/Newspaper |
author |
Bakke, Jostein Lie, øyvind Nesje, Atle Dahl, Svein Olaf Paasche, øyvind |
spellingShingle |
Bakke, Jostein Lie, øyvind Nesje, Atle Dahl, Svein Olaf Paasche, øyvind Utilizing physical sediment variability in glacier-fed lakes for continuous glacier reconstructions during the Holocene, northern Folgefonna, western Norway |
author_facet |
Bakke, Jostein Lie, øyvind Nesje, Atle Dahl, Svein Olaf Paasche, øyvind |
author_sort |
Bakke, Jostein |
title |
Utilizing physical sediment variability in glacier-fed lakes for continuous glacier reconstructions during the Holocene, northern Folgefonna, western Norway |
title_short |
Utilizing physical sediment variability in glacier-fed lakes for continuous glacier reconstructions during the Holocene, northern Folgefonna, western Norway |
title_full |
Utilizing physical sediment variability in glacier-fed lakes for continuous glacier reconstructions during the Holocene, northern Folgefonna, western Norway |
title_fullStr |
Utilizing physical sediment variability in glacier-fed lakes for continuous glacier reconstructions during the Holocene, northern Folgefonna, western Norway |
title_full_unstemmed |
Utilizing physical sediment variability in glacier-fed lakes for continuous glacier reconstructions during the Holocene, northern Folgefonna, western Norway |
title_sort |
utilizing physical sediment variability in glacier-fed lakes for continuous glacier reconstructions during the holocene, northern folgefonna, western norway |
publisher |
SAGE Publications |
publishDate |
2005 |
url |
http://dx.doi.org/10.1191/0959683605hl797rp https://journals.sagepub.com/doi/pdf/10.1191/0959683605hl797rp |
long_lat |
ENVELOPE(9.642,9.642,63.170,63.170) |
geographic |
Ela Norway |
geographic_facet |
Ela Norway |
genre |
glacier Ice cap North Atlantic North Atlantic oscillation |
genre_facet |
glacier Ice cap North Atlantic North Atlantic oscillation |
op_source |
The Holocene volume 15, issue 2, page 161-176 ISSN 0959-6836 1477-0911 |
op_rights |
https://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1191/0959683605hl797rp |
container_title |
The Holocene |
container_volume |
15 |
container_issue |
2 |
container_start_page |
161 |
op_container_end_page |
176 |
_version_ |
1813448104487157760 |