Radiocarbon ages of sediment core PG1414-2 from Beall Lake, Windmill Islands
A mid-Holocene climate optimum is inferred from a palaeosalinity reconstruction of a closed saline lake (Beall Lake) from the Windmill Islands, East Antarctica using an expanded diatom salinity weighted averaging (WA) regression and calibration model. The addition of 14 lakes and ponds from the Wind...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.849261 2023-05-15T13:44:47+02:00 Radiocarbon ages of sediment core PG1414-2 from Beall Lake, Windmill Islands Roberts, Donna McMinn, Andrew Cremer, Holger Gore, Damian B Melles, Martin LATITUDE: -66.297500 * LONGITUDE: 110.484000 * DATE/TIME START: 1998-11-11T00:00:00 * DATE/TIME END: 1998-11-11T00:00:00 2004-09-10 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.849261 https://doi.org/10.1594/PANGAEA.849261 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.849261 https://doi.org/10.1594/PANGAEA.849261 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Roberts, Donna; McMinn, Andrew; Cremer, Holger; Gore, Damian B; Melles, Martin (2004): The Holocene evolution and palaeosalinity history of Beall Lake, Windmill Islands (East Antarctica) using an expanded diatom-based weighted averaging model. Palaeogeography, Palaeoclimatology, Palaeoecology, 208(1-2), 121-140, https://doi.org/10.1016/j.palaeo.2004.02.032 Beall Lake Casey Hand push corer HSR PG1414-2 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 WindmillIslands1998 Dataset 2004 ftpangaea https://doi.org/10.1594/PANGAEA.849261 https://doi.org/10.1016/j.palaeo.2004.02.032 2023-01-20T07:33:31Z A mid-Holocene climate optimum is inferred from a palaeosalinity reconstruction of a closed saline lake (Beall Lake) from the Windmill Islands, East Antarctica using an expanded diatom salinity weighted averaging (WA) regression and calibration model. The addition of 14 lakes and ponds from the Windmill Islands, East Antarctica, to an existing weighted averaging regression and calibration palaeosalinity model of 33 lakes from the Vestfold Hills, East Antarctica expands the number of taxa and lakes and the range of salinity in the existing model and improves the model's predictive ability. This improved model was used to infer Holocene changes in lake water salinity in Beall Lake, Windmill Islands. Six changes in diatom-inferred salinity in Beall Lake are put into broad chronological context based on three radiocarbon dates: as the East Antarctic Ice Sheet (EAIS) retreated from the Windmill Islands during the early Holocene (~9000-8130 corr. yr BP), Beall Lake formed as a melt water-fed freshwater lake, which gradually became more saline as marine influence increased from ~8000 corr. yr BP. Between ~8000 and 4800 corr. yr BP, the diatom assemblage included planktonic marine taxa such as Chaetoceros spp. and cryophilic taxa such as Fragilariopsis cylindrus, which indicate favourable summer growth conditions. A mid-Holocene warm period produced a climate that was warmer and more humid with increased precipitation and snow accumulation. This is reflected in the Beall Lake core as a reduction in the salinity of the lake diatom assemblage from ~4800-4600 corr. yr BP. Holocene isostatic uplift rates in the Windmill Islands vary from 5-6 m/1000 yr. By applying this uplift rate, it is calculated that the bedrock would have risen above sea level by ~4000 yr BP. The Beall Lake core diatom assemblage from ~4600-2900 corr. yr BP includes both marine cryophilic and planktonic taxa together with freshwater benthic and planktonic lacustrine taxa. This mix of species indicates the emergence of the lake from the sea around ~4600 ... Dataset Antarc* Antarctic Antarctica Arctic East Antarctica Ice Sheet Sea ice Windmill Islands PANGAEA - Data Publisher for Earth & Environmental Science Arctic Antarctic East Antarctica Vestfold Hills East Antarctic Ice Sheet Vestfold Windmill Islands ENVELOPE(110.417,110.417,-66.350,-66.350) Saline Lake ENVELOPE(-111.528,-111.528,57.081,57.081) ENVELOPE(110.484000,110.484000,-66.297500,-66.297500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Beall Lake Casey Hand push corer HSR PG1414-2 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 WindmillIslands1998 |
spellingShingle |
Beall Lake Casey Hand push corer HSR PG1414-2 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 WindmillIslands1998 Roberts, Donna McMinn, Andrew Cremer, Holger Gore, Damian B Melles, Martin Radiocarbon ages of sediment core PG1414-2 from Beall Lake, Windmill Islands |
topic_facet |
Beall Lake Casey Hand push corer HSR PG1414-2 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158 WindmillIslands1998 |
description |
A mid-Holocene climate optimum is inferred from a palaeosalinity reconstruction of a closed saline lake (Beall Lake) from the Windmill Islands, East Antarctica using an expanded diatom salinity weighted averaging (WA) regression and calibration model. The addition of 14 lakes and ponds from the Windmill Islands, East Antarctica, to an existing weighted averaging regression and calibration palaeosalinity model of 33 lakes from the Vestfold Hills, East Antarctica expands the number of taxa and lakes and the range of salinity in the existing model and improves the model's predictive ability. This improved model was used to infer Holocene changes in lake water salinity in Beall Lake, Windmill Islands. Six changes in diatom-inferred salinity in Beall Lake are put into broad chronological context based on three radiocarbon dates: as the East Antarctic Ice Sheet (EAIS) retreated from the Windmill Islands during the early Holocene (~9000-8130 corr. yr BP), Beall Lake formed as a melt water-fed freshwater lake, which gradually became more saline as marine influence increased from ~8000 corr. yr BP. Between ~8000 and 4800 corr. yr BP, the diatom assemblage included planktonic marine taxa such as Chaetoceros spp. and cryophilic taxa such as Fragilariopsis cylindrus, which indicate favourable summer growth conditions. A mid-Holocene warm period produced a climate that was warmer and more humid with increased precipitation and snow accumulation. This is reflected in the Beall Lake core as a reduction in the salinity of the lake diatom assemblage from ~4800-4600 corr. yr BP. Holocene isostatic uplift rates in the Windmill Islands vary from 5-6 m/1000 yr. By applying this uplift rate, it is calculated that the bedrock would have risen above sea level by ~4000 yr BP. The Beall Lake core diatom assemblage from ~4600-2900 corr. yr BP includes both marine cryophilic and planktonic taxa together with freshwater benthic and planktonic lacustrine taxa. This mix of species indicates the emergence of the lake from the sea around ~4600 ... |
format |
Dataset |
author |
Roberts, Donna McMinn, Andrew Cremer, Holger Gore, Damian B Melles, Martin |
author_facet |
Roberts, Donna McMinn, Andrew Cremer, Holger Gore, Damian B Melles, Martin |
author_sort |
Roberts, Donna |
title |
Radiocarbon ages of sediment core PG1414-2 from Beall Lake, Windmill Islands |
title_short |
Radiocarbon ages of sediment core PG1414-2 from Beall Lake, Windmill Islands |
title_full |
Radiocarbon ages of sediment core PG1414-2 from Beall Lake, Windmill Islands |
title_fullStr |
Radiocarbon ages of sediment core PG1414-2 from Beall Lake, Windmill Islands |
title_full_unstemmed |
Radiocarbon ages of sediment core PG1414-2 from Beall Lake, Windmill Islands |
title_sort |
radiocarbon ages of sediment core pg1414-2 from beall lake, windmill islands |
publisher |
PANGAEA |
publishDate |
2004 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.849261 https://doi.org/10.1594/PANGAEA.849261 |
op_coverage |
LATITUDE: -66.297500 * LONGITUDE: 110.484000 * DATE/TIME START: 1998-11-11T00:00:00 * DATE/TIME END: 1998-11-11T00:00:00 |
long_lat |
ENVELOPE(110.417,110.417,-66.350,-66.350) ENVELOPE(-111.528,-111.528,57.081,57.081) ENVELOPE(110.484000,110.484000,-66.297500,-66.297500) |
geographic |
Arctic Antarctic East Antarctica Vestfold Hills East Antarctic Ice Sheet Vestfold Windmill Islands Saline Lake |
geographic_facet |
Arctic Antarctic East Antarctica Vestfold Hills East Antarctic Ice Sheet Vestfold Windmill Islands Saline Lake |
genre |
Antarc* Antarctic Antarctica Arctic East Antarctica Ice Sheet Sea ice Windmill Islands |
genre_facet |
Antarc* Antarctic Antarctica Arctic East Antarctica Ice Sheet Sea ice Windmill Islands |
op_source |
Supplement to: Roberts, Donna; McMinn, Andrew; Cremer, Holger; Gore, Damian B; Melles, Martin (2004): The Holocene evolution and palaeosalinity history of Beall Lake, Windmill Islands (East Antarctica) using an expanded diatom-based weighted averaging model. Palaeogeography, Palaeoclimatology, Palaeoecology, 208(1-2), 121-140, https://doi.org/10.1016/j.palaeo.2004.02.032 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.849261 https://doi.org/10.1594/PANGAEA.849261 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.849261 https://doi.org/10.1016/j.palaeo.2004.02.032 |
_version_ |
1766206345903603712 |