A multiproxy palaeolimnological investigation of Holocene environmental change, between c. 10 700 and 7200 years BP, at Holebudalen, southern Norway
Geochemical analyses (x-ray fluorescence, delta C-13 and C/N ratios) were used to reconstruct early Holocene environments (between 10 685 and 7260 cal. yr BP) at a small lake near Holebudalen, southern Norway. Results show a period of increasing stability, with reduced catchment inwash (shown by tit...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:166196 2023-05-15T17:45:00+02:00 A multiproxy palaeolimnological investigation of Holocene environmental change, between c. 10 700 and 7200 years BP, at Holebudalen, southern Norway Panizzo, VN Jones, VJ Birks, HJB Boyle, JF Brooks, SJ Leng, MJ 2008-08 http://discovery.ucl.ac.uk/166196/ unknown SAGE PUBLICATIONS LTD HOLOCENE , 18 (5) 805 - 817. (2008) palaeolimnology palaeoclimate early Holocene '8.2 ka event' diatoms isotopes geochemistry southern Norway TREE-LINE AREA NORTHERN SWEDEN CLIMATE-CHANGE SEDIMENT SEQUENCES MEAN TEMPERATURE AIR TEMPERATURES WESTERN NORWAY LAKE-SEDIMENTS COLD EVENT POLLEN Article 2008 ftucl 2016-01-21T23:19:41Z Geochemical analyses (x-ray fluorescence, delta C-13 and C/N ratios) were used to reconstruct early Holocene environments (between 10 685 and 7260 cal. yr BP) at a small lake near Holebudalen, southern Norway. Results show a period of increasing stability, with reduced catchment inwash (shown by titanium and potassium minerals), vegetation stabilization and increasing aquatic productivity (C/N ratios). However, periods of instability (loss on ignition (LOI) decrease) are also seen ( most notably at c. 9060 cal. yr BP). Chironomid-inferred July temperature (CI-T) reconstructions show a cooling of c. 2 degrees C (RMSEP = 1.0 degrees C) between c. 8400 and 8000 cal. yr BP and so high-resolution (5 mm; c. 20 yr) diatom analyses were conducted between 8675 and 7830 cal. yr BP in order to further investigate this change. Between c. 8270 and 8000 cal. yr BP there were large reductions (> 50%) in the abundance of tychoplanktonic diatoms (eg, Aulacoseira species) and absolute increases in periphytic diatom communities (eg, Navicula pupula, Pinnularia mesolepta). The multiproxy analyses suggest a period of increased lake ice cover with associated reductions in turbulence during this time. Diatom flora changes are concomitant with a fall in percent LOI and increased catchment erosion at the site and other evidence of regional climatic perturbations in the early Holocene. Therefore, superimposed upon an early Holocene warming trend at Holebudalen, there are climatic perturbations, for example reflected between c. 8200 and 8000 cal. yr BP by diatom communities. Article in Journal/Newspaper Northern Sweden University College London: UCL Discovery Norway |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
unknown |
topic |
palaeolimnology palaeoclimate early Holocene '8.2 ka event' diatoms isotopes geochemistry southern Norway TREE-LINE AREA NORTHERN SWEDEN CLIMATE-CHANGE SEDIMENT SEQUENCES MEAN TEMPERATURE AIR TEMPERATURES WESTERN NORWAY LAKE-SEDIMENTS COLD EVENT POLLEN |
spellingShingle |
palaeolimnology palaeoclimate early Holocene '8.2 ka event' diatoms isotopes geochemistry southern Norway TREE-LINE AREA NORTHERN SWEDEN CLIMATE-CHANGE SEDIMENT SEQUENCES MEAN TEMPERATURE AIR TEMPERATURES WESTERN NORWAY LAKE-SEDIMENTS COLD EVENT POLLEN Panizzo, VN Jones, VJ Birks, HJB Boyle, JF Brooks, SJ Leng, MJ A multiproxy palaeolimnological investigation of Holocene environmental change, between c. 10 700 and 7200 years BP, at Holebudalen, southern Norway |
topic_facet |
palaeolimnology palaeoclimate early Holocene '8.2 ka event' diatoms isotopes geochemistry southern Norway TREE-LINE AREA NORTHERN SWEDEN CLIMATE-CHANGE SEDIMENT SEQUENCES MEAN TEMPERATURE AIR TEMPERATURES WESTERN NORWAY LAKE-SEDIMENTS COLD EVENT POLLEN |
description |
Geochemical analyses (x-ray fluorescence, delta C-13 and C/N ratios) were used to reconstruct early Holocene environments (between 10 685 and 7260 cal. yr BP) at a small lake near Holebudalen, southern Norway. Results show a period of increasing stability, with reduced catchment inwash (shown by titanium and potassium minerals), vegetation stabilization and increasing aquatic productivity (C/N ratios). However, periods of instability (loss on ignition (LOI) decrease) are also seen ( most notably at c. 9060 cal. yr BP). Chironomid-inferred July temperature (CI-T) reconstructions show a cooling of c. 2 degrees C (RMSEP = 1.0 degrees C) between c. 8400 and 8000 cal. yr BP and so high-resolution (5 mm; c. 20 yr) diatom analyses were conducted between 8675 and 7830 cal. yr BP in order to further investigate this change. Between c. 8270 and 8000 cal. yr BP there were large reductions (> 50%) in the abundance of tychoplanktonic diatoms (eg, Aulacoseira species) and absolute increases in periphytic diatom communities (eg, Navicula pupula, Pinnularia mesolepta). The multiproxy analyses suggest a period of increased lake ice cover with associated reductions in turbulence during this time. Diatom flora changes are concomitant with a fall in percent LOI and increased catchment erosion at the site and other evidence of regional climatic perturbations in the early Holocene. Therefore, superimposed upon an early Holocene warming trend at Holebudalen, there are climatic perturbations, for example reflected between c. 8200 and 8000 cal. yr BP by diatom communities. |
format |
Article in Journal/Newspaper |
author |
Panizzo, VN Jones, VJ Birks, HJB Boyle, JF Brooks, SJ Leng, MJ |
author_facet |
Panizzo, VN Jones, VJ Birks, HJB Boyle, JF Brooks, SJ Leng, MJ |
author_sort |
Panizzo, VN |
title |
A multiproxy palaeolimnological investigation of Holocene environmental change, between c. 10 700 and 7200 years BP, at Holebudalen, southern Norway |
title_short |
A multiproxy palaeolimnological investigation of Holocene environmental change, between c. 10 700 and 7200 years BP, at Holebudalen, southern Norway |
title_full |
A multiproxy palaeolimnological investigation of Holocene environmental change, between c. 10 700 and 7200 years BP, at Holebudalen, southern Norway |
title_fullStr |
A multiproxy palaeolimnological investigation of Holocene environmental change, between c. 10 700 and 7200 years BP, at Holebudalen, southern Norway |
title_full_unstemmed |
A multiproxy palaeolimnological investigation of Holocene environmental change, between c. 10 700 and 7200 years BP, at Holebudalen, southern Norway |
title_sort |
multiproxy palaeolimnological investigation of holocene environmental change, between c. 10 700 and 7200 years bp, at holebudalen, southern norway |
publisher |
SAGE PUBLICATIONS LTD |
publishDate |
2008 |
url |
http://discovery.ucl.ac.uk/166196/ |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
HOLOCENE , 18 (5) 805 - 817. (2008) |
_version_ |
1766147720223916032 |