‘Little Ice Age’ glacier variations in Jotunheimen, southern Norwvay: a study in regionally controlled lichenometric dating of recessional moraines with implications for climate and lichen growth rates
A new approach to regional lichenometric dating is developed and applied to‘Little Ice Age’ moraine-ridge sequences on 16 glacier forelands in Jotunheimen, southern Norway. Lichenometric-dating curves, based on the Rhizocarpon subgenus, are constructed independently for west, central and east Jotunh...
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Language: | English |
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Online Access: | http://dx.doi.org/10.1191/0959683605hl779rp http://journals.sagepub.com/doi/pdf/10.1191/0959683605hl779rp |
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crsagepubl:10.1191/0959683605hl779rp 2024-09-15T18:07:52+00:00 ‘Little Ice Age’ glacier variations in Jotunheimen, southern Norwvay: a study in regionally controlled lichenometric dating of recessional moraines with implications for climate and lichen growth rates Matthews, John A. 2005 http://dx.doi.org/10.1191/0959683605hl779rp http://journals.sagepub.com/doi/pdf/10.1191/0959683605hl779rp en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 15, issue 1, page 1-19 ISSN 0959-6836 1477-0911 journal-article 2005 crsagepubl https://doi.org/10.1191/0959683605hl779rp 2024-08-12T04:31:46Z A new approach to regional lichenometric dating is developed and applied to‘Little Ice Age’ moraine-ridge sequences on 16 glacier forelands in Jotunheimen, southern Norway. Lichenometric-dating curves, based on the Rhizocarpon subgenus, are constructed independently for west, central and east Jotunheimen. Although there are differences between the subregions, a composite regional moraine chronology for Jotunheimen identifies 12 episodes of moraine formation in AD 1743-1750 (the regional‘Little Ice Age’ glacier maximum), 1762-1771, 1782-1790, 1796-1802, 1811-1818, 1833-1838, 1845-1854, 1860-1868, 1871-1879, 1886-1898, 1915-1922 and 1927-1934. Spatial and temporal patterns in glacier behaviour between the subregions and between Jotunheimen and the neighbouring Jostedalsbreen are explained in terms of the interaction of annual to decadal variations in summer temperature and winter precipitation: glacier advances and moraine-formation events driven primarily by winter-precipitation variations exhibit subregional patterns while summer-temperature forcing affects more synchronous glacier behaviour across the region. Regionally controlled lichenometric dating improves the accuracy of dating by up to about±20 years on relatively old moraines and is dependent on regional patterns in the rate of lichen growth. On relatively young surfaces, mean cumulative growth rate declines from about 0.75mm yr -1 in maritime west Jotunheimen to about 0.55mm yr -1 in continental east Jotunheimen (though the differential in growth rate is less on older surfaces). Article in Journal/Newspaper glacier SAGE Publications The Holocene 15 1 1 19 |
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English |
description |
A new approach to regional lichenometric dating is developed and applied to‘Little Ice Age’ moraine-ridge sequences on 16 glacier forelands in Jotunheimen, southern Norway. Lichenometric-dating curves, based on the Rhizocarpon subgenus, are constructed independently for west, central and east Jotunheimen. Although there are differences between the subregions, a composite regional moraine chronology for Jotunheimen identifies 12 episodes of moraine formation in AD 1743-1750 (the regional‘Little Ice Age’ glacier maximum), 1762-1771, 1782-1790, 1796-1802, 1811-1818, 1833-1838, 1845-1854, 1860-1868, 1871-1879, 1886-1898, 1915-1922 and 1927-1934. Spatial and temporal patterns in glacier behaviour between the subregions and between Jotunheimen and the neighbouring Jostedalsbreen are explained in terms of the interaction of annual to decadal variations in summer temperature and winter precipitation: glacier advances and moraine-formation events driven primarily by winter-precipitation variations exhibit subregional patterns while summer-temperature forcing affects more synchronous glacier behaviour across the region. Regionally controlled lichenometric dating improves the accuracy of dating by up to about±20 years on relatively old moraines and is dependent on regional patterns in the rate of lichen growth. On relatively young surfaces, mean cumulative growth rate declines from about 0.75mm yr -1 in maritime west Jotunheimen to about 0.55mm yr -1 in continental east Jotunheimen (though the differential in growth rate is less on older surfaces). |
format |
Article in Journal/Newspaper |
author |
Matthews, John A. |
spellingShingle |
Matthews, John A. ‘Little Ice Age’ glacier variations in Jotunheimen, southern Norwvay: a study in regionally controlled lichenometric dating of recessional moraines with implications for climate and lichen growth rates |
author_facet |
Matthews, John A. |
author_sort |
Matthews, John A. |
title |
‘Little Ice Age’ glacier variations in Jotunheimen, southern Norwvay: a study in regionally controlled lichenometric dating of recessional moraines with implications for climate and lichen growth rates |
title_short |
‘Little Ice Age’ glacier variations in Jotunheimen, southern Norwvay: a study in regionally controlled lichenometric dating of recessional moraines with implications for climate and lichen growth rates |
title_full |
‘Little Ice Age’ glacier variations in Jotunheimen, southern Norwvay: a study in regionally controlled lichenometric dating of recessional moraines with implications for climate and lichen growth rates |
title_fullStr |
‘Little Ice Age’ glacier variations in Jotunheimen, southern Norwvay: a study in regionally controlled lichenometric dating of recessional moraines with implications for climate and lichen growth rates |
title_full_unstemmed |
‘Little Ice Age’ glacier variations in Jotunheimen, southern Norwvay: a study in regionally controlled lichenometric dating of recessional moraines with implications for climate and lichen growth rates |
title_sort |
‘little ice age’ glacier variations in jotunheimen, southern norwvay: a study in regionally controlled lichenometric dating of recessional moraines with implications for climate and lichen growth rates |
publisher |
SAGE Publications |
publishDate |
2005 |
url |
http://dx.doi.org/10.1191/0959683605hl779rp http://journals.sagepub.com/doi/pdf/10.1191/0959683605hl779rp |
genre |
glacier |
genre_facet |
glacier |
op_source |
The Holocene volume 15, issue 1, page 1-19 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1191/0959683605hl779rp |
container_title |
The Holocene |
container_volume |
15 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
19 |
_version_ |
1810445226682089472 |