Lake Store Finnsjøen – a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains
The Lateglacial (LG) deglaciation and vegetation development in the Scandes Mountains has been debated for a century. Here we present new evidence from microfossils, radiocarbon dated plant macrofossils and sedimentary ancient DNA from laminated sediments in Lake Store Finnsjøen (1260 m a.s.l.) at D...
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ftuglasgow:oai:eprints.gla.ac.uk:106808 2023-05-15T15:44:30+02:00 Lake Store Finnsjøen – a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains Paus, Aage Boessenkool, Sanne Brochmann, Christian Epp, Laura Saskia Fabel, Derek Haflidason, Haflidi Linge, Henriette 2015-08-01 text http://eprints.gla.ac.uk/106808/ http://eprints.gla.ac.uk/106808/1/106808.pdf en eng Elsevier Ltd. http://eprints.gla.ac.uk/106808/1/106808.pdf Paus, A., Boessenkool, S., Brochmann, C., Epp, L. S., Fabel, D. <http://eprints.gla.ac.uk/view/author/5585.html> , Haflidason, H. and Linge, H. (2015) Lake Store Finnsjøen – a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains. Quaternary Science Reviews <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Science_Reviews.html>, 121, pp. 36-51. (doi:10.1016/j.quascirev.2015.05.004 <http://dx.doi.org/10.1016/j.quascirev.2015.05.004>) Articles PeerReviewed 2015 ftuglasgow https://doi.org/10.1016/j.quascirev.2015.05.004 2020-01-10T00:55:02Z The Lateglacial (LG) deglaciation and vegetation development in the Scandes Mountains has been debated for a century. Here we present new evidence from microfossils, radiocarbon dated plant macrofossils and sedimentary ancient DNA from laminated sediments in Lake Store Finnsjøen (1260 m a.s.l.) at Dovre, Central Norway. Combined with previous results from three other Dovre lakes, this allows for new interpretations of events during and immediately after the LG deglaciation. The Finnsjøen sediments present the first uninterrupted record of local vegetation development in the Scandes Mountains from the late Younger Dryas (YD), ca 12,000 cal years BP, to the early Holocene around 9700 cal years BP. The local vegetation in late YD/early Holocene was extremely sparse with pioneer herbs (e.g. Artemisia norvegica, Beckwithia, Campanula cf. uniflora, Koenigia, Oxyria, Papaver, Saxifraga spp.) and dwarf-shrubs (Betula nana, Salix including Salix polaris). From 11,300 cal years BP, local vegetation rapidly closed with dominant Dryas, Saxifraga spp., and Silene acaulis. From ca 10,700 cal years BP, open birch-forests with juniper, Empetrum nigrum and other dwarf-shrubs developed. Pine forests established within the area from 10,300 cal years BP. We identified the cold Preboreal Oscillation (PBO), not earlier described from pollen data in South Norway, around 11,400 cal years BP by a regional pollen signal. Distinct local vegetation changes were not detected until the post-PBO warming around 11,300 cal years BP. Apparently, the earlier warming at the YD/Holocene transition at 11,650 cal years BP was too weak and short-lived for vegetation closure at high altitudes at Dovre. For the first time, we demonstrate a regional glacier readvance and local ice cap formations during the YD in the Scandes Mountains. In two of the deep lakes with small catchments, YD glaciation blocked sedimentation without removing old sediments and caused a hiatus separating sediments of the ice-free LG interstadial (LGI) from those of the ice-free Holocene period. Both regional glaciers and local ice caps caused hiati. Ice-free pre-YD conditions at Dovre followed by a YD readvance point to a scenario that is intermediate between the maximum ice model postulating a thick glacier during the entire LG, and the minimum ice model postulating thin and multi-domed early LG ice. Article in Journal/Newspaper Betula nana Empetrum nigrum glacier Ice Sheet Salix polaris Silene acaulis University of Glasgow: Enlighten - Publications Norway Quaternary Science Reviews 121 36 51 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
English |
description |
The Lateglacial (LG) deglaciation and vegetation development in the Scandes Mountains has been debated for a century. Here we present new evidence from microfossils, radiocarbon dated plant macrofossils and sedimentary ancient DNA from laminated sediments in Lake Store Finnsjøen (1260 m a.s.l.) at Dovre, Central Norway. Combined with previous results from three other Dovre lakes, this allows for new interpretations of events during and immediately after the LG deglaciation. The Finnsjøen sediments present the first uninterrupted record of local vegetation development in the Scandes Mountains from the late Younger Dryas (YD), ca 12,000 cal years BP, to the early Holocene around 9700 cal years BP. The local vegetation in late YD/early Holocene was extremely sparse with pioneer herbs (e.g. Artemisia norvegica, Beckwithia, Campanula cf. uniflora, Koenigia, Oxyria, Papaver, Saxifraga spp.) and dwarf-shrubs (Betula nana, Salix including Salix polaris). From 11,300 cal years BP, local vegetation rapidly closed with dominant Dryas, Saxifraga spp., and Silene acaulis. From ca 10,700 cal years BP, open birch-forests with juniper, Empetrum nigrum and other dwarf-shrubs developed. Pine forests established within the area from 10,300 cal years BP. We identified the cold Preboreal Oscillation (PBO), not earlier described from pollen data in South Norway, around 11,400 cal years BP by a regional pollen signal. Distinct local vegetation changes were not detected until the post-PBO warming around 11,300 cal years BP. Apparently, the earlier warming at the YD/Holocene transition at 11,650 cal years BP was too weak and short-lived for vegetation closure at high altitudes at Dovre. For the first time, we demonstrate a regional glacier readvance and local ice cap formations during the YD in the Scandes Mountains. In two of the deep lakes with small catchments, YD glaciation blocked sedimentation without removing old sediments and caused a hiatus separating sediments of the ice-free LG interstadial (LGI) from those of the ice-free Holocene period. Both regional glaciers and local ice caps caused hiati. Ice-free pre-YD conditions at Dovre followed by a YD readvance point to a scenario that is intermediate between the maximum ice model postulating a thick glacier during the entire LG, and the minimum ice model postulating thin and multi-domed early LG ice. |
format |
Article in Journal/Newspaper |
author |
Paus, Aage Boessenkool, Sanne Brochmann, Christian Epp, Laura Saskia Fabel, Derek Haflidason, Haflidi Linge, Henriette |
spellingShingle |
Paus, Aage Boessenkool, Sanne Brochmann, Christian Epp, Laura Saskia Fabel, Derek Haflidason, Haflidi Linge, Henriette Lake Store Finnsjøen – a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains |
author_facet |
Paus, Aage Boessenkool, Sanne Brochmann, Christian Epp, Laura Saskia Fabel, Derek Haflidason, Haflidi Linge, Henriette |
author_sort |
Paus, Aage |
title |
Lake Store Finnsjøen – a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains |
title_short |
Lake Store Finnsjøen – a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains |
title_full |
Lake Store Finnsjøen – a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains |
title_fullStr |
Lake Store Finnsjøen – a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains |
title_full_unstemmed |
Lake Store Finnsjøen – a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains |
title_sort |
lake store finnsjøen – a key for understanding lateglacial/early holocene vegetation and ice sheet dynamics in the central scandes mountains |
publisher |
Elsevier Ltd. |
publishDate |
2015 |
url |
http://eprints.gla.ac.uk/106808/ http://eprints.gla.ac.uk/106808/1/106808.pdf |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Betula nana Empetrum nigrum glacier Ice Sheet Salix polaris Silene acaulis |
genre_facet |
Betula nana Empetrum nigrum glacier Ice Sheet Salix polaris Silene acaulis |
op_relation |
http://eprints.gla.ac.uk/106808/1/106808.pdf Paus, A., Boessenkool, S., Brochmann, C., Epp, L. S., Fabel, D. <http://eprints.gla.ac.uk/view/author/5585.html> , Haflidason, H. and Linge, H. (2015) Lake Store Finnsjøen – a key for understanding Lateglacial/early Holocene vegetation and ice sheet dynamics in the central Scandes Mountains. Quaternary Science Reviews <http://eprints.gla.ac.uk/view/journal_volume/Quaternary_Science_Reviews.html>, 121, pp. 36-51. (doi:10.1016/j.quascirev.2015.05.004 <http://dx.doi.org/10.1016/j.quascirev.2015.05.004>) |
op_doi |
https://doi.org/10.1016/j.quascirev.2015.05.004 |
container_title |
Quaternary Science Reviews |
container_volume |
121 |
container_start_page |
36 |
op_container_end_page |
51 |
_version_ |
1766378892566724608 |