Svalbard ice-sheet decay after the Last Glacial Maximum:new insights from micropalaeontological and organic biomarker paleoceanographical reconstructions
A marine sediment core retrieved from the middle continental slope of the northwestern Barents Sea was analyzed for its geochemical (alkenones) and micropalaeontological (diatoms, coccolithophores and dinocyst) content in order to reconstruct the evolution of upper ocean conditions and ice-sheet dyn...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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Online Access: | https://researchers.mq.edu.au/en/publications/ba6edbe2-d7ca-4038-b291-49d2868ec7e9 https://doi.org/10.1016/j.palaeo.2016.10.034 http://www.scopus.com/inward/record.url?scp=84996671237&partnerID=8YFLogxK |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/ba6edbe2-d7ca-4038-b291-49d2868ec7e9 2024-09-15T17:57:49+00:00 Svalbard ice-sheet decay after the Last Glacial Maximum:new insights from micropalaeontological and organic biomarker paleoceanographical reconstructions Rigual-Hernández, A. S. Colmenero-Hidalgo, E. Martrat, B. Bárcena, M. A. de Vernal, A. Sierro, F. J. Flores, J. A. Grimalt, J. O. Henry, M. Lucchi, R. G. 2017-01-01 https://researchers.mq.edu.au/en/publications/ba6edbe2-d7ca-4038-b291-49d2868ec7e9 https://doi.org/10.1016/j.palaeo.2016.10.034 http://www.scopus.com/inward/record.url?scp=84996671237&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Rigual-Hernández , A S , Colmenero-Hidalgo , E , Martrat , B , Bárcena , M A , de Vernal , A , Sierro , F J , Flores , J A , Grimalt , J O , Henry , M & Lucchi , R G 2017 , ' Svalbard ice-sheet decay after the Last Glacial Maximum : new insights from micropalaeontological and organic biomarker paleoceanographical reconstructions ' , Palaeogeography, Palaeoclimatology, Palaeoecology , vol. 465 , pp. 225-236 . https://doi.org/10.1016/j.palaeo.2016.10.034 Svalbard Barents Sea deglaciation holocene microfossils dinocysts biomarkers article 2017 ftmacquarieunicr https://doi.org/10.1016/j.palaeo.2016.10.034 2024-09-04T23:52:01Z A marine sediment core retrieved from the middle continental slope of the northwestern Barents Sea was analyzed for its geochemical (alkenones) and micropalaeontological (diatoms, coccolithophores and dinocyst) content in order to reconstruct the evolution of upper ocean conditions and ice-sheet dynamics during the last 25 kyr. Additionally, quantitative reconstructions of sea surface conditions (temperature, salinity and sea-ice cover extent) were conducted based on the best analogue technique applied to dinocyst assemblages and on the alkenone unsaturation index. The sediment core contains a post Last Glacial Maximum depositional sequence unaffected by stratigraphic discontinuities. Low salinity and laminated sediments after 20 cal kyr BP, indicate a massive settling of meltwater sediment-laden plumes from the initial melting of the Svalbard-Barents Sea Ice Sheet on Western Svalbard. First record of measurable alkenones, together with a drop of the number of months of sea-ice cover and increase in SSTs suggests an intensification of the influx of Atlantic waters into the study area at ~ 15 cal kyr BP representing the termination of the last glacial period and onset of the Bølling interstadial. The first occurrence of diatoms and increase in the abundance of all microfossils marked the onset of the Holocene at 11.2 cal kyr BP when modern-type sea surface conditions were rapidly established in Western Svalbard. Reconstructions based on dinocyst data and alkenone unsaturation index suggest relatively warm and stable temperatures between 9.9 and 8.9 kyr BP and a decrease of SSTs from 4.2 cal kyr BP to present coinciding with the Holocene Thermal Maximum and the decrease of summer insolation in the high latitude northern hemisphere, respectively. Article in Journal/Newspaper Barents Sea Ice Sheet Sea ice Svalbard Svalbard-Barents Sea Ice sheet Macquarie University Research Portal Palaeogeography, Palaeoclimatology, Palaeoecology 465 225 236 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
topic |
Svalbard Barents Sea deglaciation holocene microfossils dinocysts biomarkers |
spellingShingle |
Svalbard Barents Sea deglaciation holocene microfossils dinocysts biomarkers Rigual-Hernández, A. S. Colmenero-Hidalgo, E. Martrat, B. Bárcena, M. A. de Vernal, A. Sierro, F. J. Flores, J. A. Grimalt, J. O. Henry, M. Lucchi, R. G. Svalbard ice-sheet decay after the Last Glacial Maximum:new insights from micropalaeontological and organic biomarker paleoceanographical reconstructions |
topic_facet |
Svalbard Barents Sea deglaciation holocene microfossils dinocysts biomarkers |
description |
A marine sediment core retrieved from the middle continental slope of the northwestern Barents Sea was analyzed for its geochemical (alkenones) and micropalaeontological (diatoms, coccolithophores and dinocyst) content in order to reconstruct the evolution of upper ocean conditions and ice-sheet dynamics during the last 25 kyr. Additionally, quantitative reconstructions of sea surface conditions (temperature, salinity and sea-ice cover extent) were conducted based on the best analogue technique applied to dinocyst assemblages and on the alkenone unsaturation index. The sediment core contains a post Last Glacial Maximum depositional sequence unaffected by stratigraphic discontinuities. Low salinity and laminated sediments after 20 cal kyr BP, indicate a massive settling of meltwater sediment-laden plumes from the initial melting of the Svalbard-Barents Sea Ice Sheet on Western Svalbard. First record of measurable alkenones, together with a drop of the number of months of sea-ice cover and increase in SSTs suggests an intensification of the influx of Atlantic waters into the study area at ~ 15 cal kyr BP representing the termination of the last glacial period and onset of the Bølling interstadial. The first occurrence of diatoms and increase in the abundance of all microfossils marked the onset of the Holocene at 11.2 cal kyr BP when modern-type sea surface conditions were rapidly established in Western Svalbard. Reconstructions based on dinocyst data and alkenone unsaturation index suggest relatively warm and stable temperatures between 9.9 and 8.9 kyr BP and a decrease of SSTs from 4.2 cal kyr BP to present coinciding with the Holocene Thermal Maximum and the decrease of summer insolation in the high latitude northern hemisphere, respectively. |
format |
Article in Journal/Newspaper |
author |
Rigual-Hernández, A. S. Colmenero-Hidalgo, E. Martrat, B. Bárcena, M. A. de Vernal, A. Sierro, F. J. Flores, J. A. Grimalt, J. O. Henry, M. Lucchi, R. G. |
author_facet |
Rigual-Hernández, A. S. Colmenero-Hidalgo, E. Martrat, B. Bárcena, M. A. de Vernal, A. Sierro, F. J. Flores, J. A. Grimalt, J. O. Henry, M. Lucchi, R. G. |
author_sort |
Rigual-Hernández, A. S. |
title |
Svalbard ice-sheet decay after the Last Glacial Maximum:new insights from micropalaeontological and organic biomarker paleoceanographical reconstructions |
title_short |
Svalbard ice-sheet decay after the Last Glacial Maximum:new insights from micropalaeontological and organic biomarker paleoceanographical reconstructions |
title_full |
Svalbard ice-sheet decay after the Last Glacial Maximum:new insights from micropalaeontological and organic biomarker paleoceanographical reconstructions |
title_fullStr |
Svalbard ice-sheet decay after the Last Glacial Maximum:new insights from micropalaeontological and organic biomarker paleoceanographical reconstructions |
title_full_unstemmed |
Svalbard ice-sheet decay after the Last Glacial Maximum:new insights from micropalaeontological and organic biomarker paleoceanographical reconstructions |
title_sort |
svalbard ice-sheet decay after the last glacial maximum:new insights from micropalaeontological and organic biomarker paleoceanographical reconstructions |
publishDate |
2017 |
url |
https://researchers.mq.edu.au/en/publications/ba6edbe2-d7ca-4038-b291-49d2868ec7e9 https://doi.org/10.1016/j.palaeo.2016.10.034 http://www.scopus.com/inward/record.url?scp=84996671237&partnerID=8YFLogxK |
genre |
Barents Sea Ice Sheet Sea ice Svalbard Svalbard-Barents Sea Ice sheet |
genre_facet |
Barents Sea Ice Sheet Sea ice Svalbard Svalbard-Barents Sea Ice sheet |
op_source |
Rigual-Hernández , A S , Colmenero-Hidalgo , E , Martrat , B , Bárcena , M A , de Vernal , A , Sierro , F J , Flores , J A , Grimalt , J O , Henry , M & Lucchi , R G 2017 , ' Svalbard ice-sheet decay after the Last Glacial Maximum : new insights from micropalaeontological and organic biomarker paleoceanographical reconstructions ' , Palaeogeography, Palaeoclimatology, Palaeoecology , vol. 465 , pp. 225-236 . https://doi.org/10.1016/j.palaeo.2016.10.034 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.palaeo.2016.10.034 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
465 |
container_start_page |
225 |
op_container_end_page |
236 |
_version_ |
1810434006528819200 |