A high-resolution elemental record of post-glacial lithic sedimentation in Upernavik Trough, western Greenland: History of ice-sheet dynamics and ocean circulation changes over the last 9100 years
A better understanding of the past dynamics of local sectors of the Greenland ice sheet (GIS) with regards to ocean circulation and climate changes can be developed from proxy records derived from marine sedimentary archives. Here we investigate the post 9.1 cal. Kyr BP history of the western sector...
Published in: | Global and Planetary Change |
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2020
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Online Access: | https://oskar-bordeaux.fr/handle/20.500.12278/199111 https://hdl.handle.net/20.500.12278/199111 https://doi.org/10.1016/j.gloplacha.2020.103217 |
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/199111 2024-05-19T07:36:56+00:00 A high-resolution elemental record of post-glacial lithic sedimentation in Upernavik Trough, western Greenland: History of ice-sheet dynamics and ocean circulation changes over the last 9100 years GIRAUDEAU, Jacques GEORGIADIS, Eleanor CARON, Myriam MARTINEZ, Philippe SAINT-ONGE, G. BILLY, Isabelle LEBLEU, Pascal THER, Olivier MASSÉ, Guillaume 2020-08 https://oskar-bordeaux.fr/handle/20.500.12278/199111 https://hdl.handle.net/20.500.12278/199111 https://doi.org/10.1016/j.gloplacha.2020.103217 EN eng 0921-8181 https://oskar-bordeaux.fr/handle/20.500.12278/199111 doi:10.1016/j.gloplacha.2020.103217 open Pas de Licence CC West Greenland Holocene Tidewater glaciers Climate changes Ocean circulation Sciences de l'environnement Planète et Univers [physics] Article de revue 2020 ftoskarbordeaux https://doi.org/20.500.12278/19911110.1016/j.gloplacha.2020.103217 2024-04-22T01:35:05Z A better understanding of the past dynamics of local sectors of the Greenland ice sheet (GIS) with regards to ocean circulation and climate changes can be developed from proxy records derived from marine sedimentary archives. Here we investigate the post 9.1 cal. Kyr BP history of the western sector of the GIS from the XRF core scanner-derived geochemistry of a sediment core retrieved from Upernavik Trough, Melville Bay. The elemental signature of material derived from Melville Bay glaciers, Upernavik Isstrom and Rink Isbrae can be inferred from the geology of the bedrocks drained by these major ice streams of the western GIS. Changes in abundance of Fe-rich basaltic material reflect changes in West Greenland Current (WGC) strength. Contributions from Melville Bay glaciers were dominant during the early part of the record as a result of the rapid retreat of this stretch of the NW GIS. Atmospheric warming and strengthened WGC between 7.5 and 5 cal. Kyrs BP promoted contributions from distal southern sources of lithic material to the sedimentation over Upernavik Trough. The Neoglacial shift in climate and ocean circulation led to a general reduction in the delivery of lithic material from western GIS glacier outlets glaciers. The particular geomorphology of the fjord hosting Rink Isbrae as well as the important depth of the Uummannaq Trough likely explain the high relative contribution of this glacier to the lithic sedimentation over Upernavik Trough during the later part of the Holocene despite a weakened WGC. Productivité biologique dans l'Océan Arctique: réponse passée, présente et future aux fluctuations climatiques, et impacts sur les flux de carbone, le réseau trophique et les communautés humaines locales Article in Journal/Newspaper Arctique* glacier Greenland Ice Sheet Rink Isbrae Tidewater Upernavik Uummannaq OSKAR Bordeaux (Open Science Knowledge ARchive) Global and Planetary Change 191 103217 |
institution |
Open Polar |
collection |
OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
West Greenland Holocene Tidewater glaciers Climate changes Ocean circulation Sciences de l'environnement Planète et Univers [physics] |
spellingShingle |
West Greenland Holocene Tidewater glaciers Climate changes Ocean circulation Sciences de l'environnement Planète et Univers [physics] GIRAUDEAU, Jacques GEORGIADIS, Eleanor CARON, Myriam MARTINEZ, Philippe SAINT-ONGE, G. BILLY, Isabelle LEBLEU, Pascal THER, Olivier MASSÉ, Guillaume A high-resolution elemental record of post-glacial lithic sedimentation in Upernavik Trough, western Greenland: History of ice-sheet dynamics and ocean circulation changes over the last 9100 years |
topic_facet |
West Greenland Holocene Tidewater glaciers Climate changes Ocean circulation Sciences de l'environnement Planète et Univers [physics] |
description |
A better understanding of the past dynamics of local sectors of the Greenland ice sheet (GIS) with regards to ocean circulation and climate changes can be developed from proxy records derived from marine sedimentary archives. Here we investigate the post 9.1 cal. Kyr BP history of the western sector of the GIS from the XRF core scanner-derived geochemistry of a sediment core retrieved from Upernavik Trough, Melville Bay. The elemental signature of material derived from Melville Bay glaciers, Upernavik Isstrom and Rink Isbrae can be inferred from the geology of the bedrocks drained by these major ice streams of the western GIS. Changes in abundance of Fe-rich basaltic material reflect changes in West Greenland Current (WGC) strength. Contributions from Melville Bay glaciers were dominant during the early part of the record as a result of the rapid retreat of this stretch of the NW GIS. Atmospheric warming and strengthened WGC between 7.5 and 5 cal. Kyrs BP promoted contributions from distal southern sources of lithic material to the sedimentation over Upernavik Trough. The Neoglacial shift in climate and ocean circulation led to a general reduction in the delivery of lithic material from western GIS glacier outlets glaciers. The particular geomorphology of the fjord hosting Rink Isbrae as well as the important depth of the Uummannaq Trough likely explain the high relative contribution of this glacier to the lithic sedimentation over Upernavik Trough during the later part of the Holocene despite a weakened WGC. Productivité biologique dans l'Océan Arctique: réponse passée, présente et future aux fluctuations climatiques, et impacts sur les flux de carbone, le réseau trophique et les communautés humaines locales |
format |
Article in Journal/Newspaper |
author |
GIRAUDEAU, Jacques GEORGIADIS, Eleanor CARON, Myriam MARTINEZ, Philippe SAINT-ONGE, G. BILLY, Isabelle LEBLEU, Pascal THER, Olivier MASSÉ, Guillaume |
author_facet |
GIRAUDEAU, Jacques GEORGIADIS, Eleanor CARON, Myriam MARTINEZ, Philippe SAINT-ONGE, G. BILLY, Isabelle LEBLEU, Pascal THER, Olivier MASSÉ, Guillaume |
author_sort |
GIRAUDEAU, Jacques |
title |
A high-resolution elemental record of post-glacial lithic sedimentation in Upernavik Trough, western Greenland: History of ice-sheet dynamics and ocean circulation changes over the last 9100 years |
title_short |
A high-resolution elemental record of post-glacial lithic sedimentation in Upernavik Trough, western Greenland: History of ice-sheet dynamics and ocean circulation changes over the last 9100 years |
title_full |
A high-resolution elemental record of post-glacial lithic sedimentation in Upernavik Trough, western Greenland: History of ice-sheet dynamics and ocean circulation changes over the last 9100 years |
title_fullStr |
A high-resolution elemental record of post-glacial lithic sedimentation in Upernavik Trough, western Greenland: History of ice-sheet dynamics and ocean circulation changes over the last 9100 years |
title_full_unstemmed |
A high-resolution elemental record of post-glacial lithic sedimentation in Upernavik Trough, western Greenland: History of ice-sheet dynamics and ocean circulation changes over the last 9100 years |
title_sort |
high-resolution elemental record of post-glacial lithic sedimentation in upernavik trough, western greenland: history of ice-sheet dynamics and ocean circulation changes over the last 9100 years |
publishDate |
2020 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/199111 https://hdl.handle.net/20.500.12278/199111 https://doi.org/10.1016/j.gloplacha.2020.103217 |
genre |
Arctique* glacier Greenland Ice Sheet Rink Isbrae Tidewater Upernavik Uummannaq |
genre_facet |
Arctique* glacier Greenland Ice Sheet Rink Isbrae Tidewater Upernavik Uummannaq |
op_relation |
0921-8181 https://oskar-bordeaux.fr/handle/20.500.12278/199111 doi:10.1016/j.gloplacha.2020.103217 |
op_rights |
open Pas de Licence CC |
op_doi |
https://doi.org/20.500.12278/19911110.1016/j.gloplacha.2020.103217 |
container_title |
Global and Planetary Change |
container_volume |
191 |
container_start_page |
103217 |
_version_ |
1799476110448132096 |