Early Holocene large-scale meltwater discharge from Greenland documented by foraminifera and sediment parameters
Records of foraminiferal assemblages combined with lithological properties (grain size, magnetic parameters and XRF data) of marine sediment cores from West Greenland coastal waters and the adjacent Labrador Sea document widespread early Holocene meltwater discharge. This discharge is concluded to o...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2013
|
Subjects: | |
Online Access: | https://pure.au.dk/portal/en/publications/9bd1813b-b567-4d22-8a0c-2d8b327afac0 https://doi.org/10.1016/j.palaeo.2012.04.006 http://www.scopus.com/inward/record.url?scp=84888199893&partnerID=8YFLogxK |
id |
ftuniaarhuspubl:oai:pure.atira.dk:publications/9bd1813b-b567-4d22-8a0c-2d8b327afac0 |
---|---|
record_format |
openpolar |
spelling |
ftuniaarhuspubl:oai:pure.atira.dk:publications/9bd1813b-b567-4d22-8a0c-2d8b327afac0 2024-05-12T08:04:15+00:00 Early Holocene large-scale meltwater discharge from Greenland documented by foraminifera and sediment parameters Seidenkrantz, Marit-Solveig Ebbesen, H. Aagaard-Sørensen, S. Moros, M. Lloyd, J.M. Olsen, Jesper Knudsen, Mads Faurschou Kuijpers, A. 2013-12-01 https://pure.au.dk/portal/en/publications/9bd1813b-b567-4d22-8a0c-2d8b327afac0 https://doi.org/10.1016/j.palaeo.2012.04.006 http://www.scopus.com/inward/record.url?scp=84888199893&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/en/publications/9bd1813b-b567-4d22-8a0c-2d8b327afac0 info:eu-repo/semantics/restrictedAccess Seidenkrantz , M-S , Ebbesen , H , Aagaard-Sørensen , S , Moros , M , Lloyd , J M , Olsen , J , Knudsen , M F & Kuijpers , A 2013 , ' Early Holocene large-scale meltwater discharge from Greenland documented by foraminifera and sediment parameters ' , Palaeogeography, Palaeoclimatology, Palaeoecology , vol. 391 , no. Part A , pp. 71-81 . https://doi.org/10.1016/j.palaeo.2012.04.006 Greenland Early Holocene Meltwater discharge Foraminifera Sediment properties Magnetic susceptibility 8.2 ka event SUBPOLAR NORTH-ATLANTIC ABRUPT CLIMATE-CHANGE GLACIAL LAKE AGASSIZ ICE-SHEET WEST GREENLAND BENTHIC FORAMINIFERA LABRADOR SEA COOLING EVENT INNUITIAN ICE FRESH-WATER article 2013 ftuniaarhuspubl https://doi.org/10.1016/j.palaeo.2012.04.006 2024-04-17T23:41:12Z Records of foraminiferal assemblages combined with lithological properties (grain size, magnetic parameters and XRF data) of marine sediment cores from West Greenland coastal waters and the adjacent Labrador Sea document widespread early Holocene meltwater discharge. This discharge is concluded to originate from large-scale melting of the Greenland Ice Sheet (GIS) having started prior to 8600 cal.yr BP and ended at about 7700-7500 cal. yr BP, when the GIS margin had withdrawn from the fjords and become mainly land-based. The benthic foraminiferal record from one of the coastal sites mainly reflects West Greenland Current (WGC) subsurface water properties and to a minor degree surface productivity. The most significant feature in this record is an abrupt shift to a higher-productivity regime around similar to 7700 cal.yr BP. We suggest that the cessation of a widespread GIS meltwater discharge at that time favoured an increased influence of (sub)surface water of Atlantic origin and initiation of modern subpolar gyre circulation enabling Labrador Sea deep convection. Further offshore, a record of planktonic foraminiferal assemblages shows an oceanographic change at ca. 9500 cal. yr BP, whilst a gradual but marked change in the planktonic foraminiferal assemblage between 8800 and 7000 cal.yr BP may be related to a narrowing of the WGC low-salinity surface water belt. The oceanic regime off West Greenland prior to similar to 7800 cal.yr BP was thus characterised by the presence of a permanent and widespread meltwater surface layer, presumably preventing deep convection in this region. Apart from indications of a slight decrease in meltwater discharge by the benthic foraminiferal fauna data, neither of the records show any clear signal of a regionally important 8.2 ka event. (C) 2012 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Greenland Ice Sheet Labrador Sea North Atlantic Aarhus University: Research Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Greenland Palaeogeography, Palaeoclimatology, Palaeoecology 391 71 81 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Greenland Early Holocene Meltwater discharge Foraminifera Sediment properties Magnetic susceptibility 8.2 ka event SUBPOLAR NORTH-ATLANTIC ABRUPT CLIMATE-CHANGE GLACIAL LAKE AGASSIZ ICE-SHEET WEST GREENLAND BENTHIC FORAMINIFERA LABRADOR SEA COOLING EVENT INNUITIAN ICE FRESH-WATER |
spellingShingle |
Greenland Early Holocene Meltwater discharge Foraminifera Sediment properties Magnetic susceptibility 8.2 ka event SUBPOLAR NORTH-ATLANTIC ABRUPT CLIMATE-CHANGE GLACIAL LAKE AGASSIZ ICE-SHEET WEST GREENLAND BENTHIC FORAMINIFERA LABRADOR SEA COOLING EVENT INNUITIAN ICE FRESH-WATER Seidenkrantz, Marit-Solveig Ebbesen, H. Aagaard-Sørensen, S. Moros, M. Lloyd, J.M. Olsen, Jesper Knudsen, Mads Faurschou Kuijpers, A. Early Holocene large-scale meltwater discharge from Greenland documented by foraminifera and sediment parameters |
topic_facet |
Greenland Early Holocene Meltwater discharge Foraminifera Sediment properties Magnetic susceptibility 8.2 ka event SUBPOLAR NORTH-ATLANTIC ABRUPT CLIMATE-CHANGE GLACIAL LAKE AGASSIZ ICE-SHEET WEST GREENLAND BENTHIC FORAMINIFERA LABRADOR SEA COOLING EVENT INNUITIAN ICE FRESH-WATER |
description |
Records of foraminiferal assemblages combined with lithological properties (grain size, magnetic parameters and XRF data) of marine sediment cores from West Greenland coastal waters and the adjacent Labrador Sea document widespread early Holocene meltwater discharge. This discharge is concluded to originate from large-scale melting of the Greenland Ice Sheet (GIS) having started prior to 8600 cal.yr BP and ended at about 7700-7500 cal. yr BP, when the GIS margin had withdrawn from the fjords and become mainly land-based. The benthic foraminiferal record from one of the coastal sites mainly reflects West Greenland Current (WGC) subsurface water properties and to a minor degree surface productivity. The most significant feature in this record is an abrupt shift to a higher-productivity regime around similar to 7700 cal.yr BP. We suggest that the cessation of a widespread GIS meltwater discharge at that time favoured an increased influence of (sub)surface water of Atlantic origin and initiation of modern subpolar gyre circulation enabling Labrador Sea deep convection. Further offshore, a record of planktonic foraminiferal assemblages shows an oceanographic change at ca. 9500 cal. yr BP, whilst a gradual but marked change in the planktonic foraminiferal assemblage between 8800 and 7000 cal.yr BP may be related to a narrowing of the WGC low-salinity surface water belt. The oceanic regime off West Greenland prior to similar to 7800 cal.yr BP was thus characterised by the presence of a permanent and widespread meltwater surface layer, presumably preventing deep convection in this region. Apart from indications of a slight decrease in meltwater discharge by the benthic foraminiferal fauna data, neither of the records show any clear signal of a regionally important 8.2 ka event. (C) 2012 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Seidenkrantz, Marit-Solveig Ebbesen, H. Aagaard-Sørensen, S. Moros, M. Lloyd, J.M. Olsen, Jesper Knudsen, Mads Faurschou Kuijpers, A. |
author_facet |
Seidenkrantz, Marit-Solveig Ebbesen, H. Aagaard-Sørensen, S. Moros, M. Lloyd, J.M. Olsen, Jesper Knudsen, Mads Faurschou Kuijpers, A. |
author_sort |
Seidenkrantz, Marit-Solveig |
title |
Early Holocene large-scale meltwater discharge from Greenland documented by foraminifera and sediment parameters |
title_short |
Early Holocene large-scale meltwater discharge from Greenland documented by foraminifera and sediment parameters |
title_full |
Early Holocene large-scale meltwater discharge from Greenland documented by foraminifera and sediment parameters |
title_fullStr |
Early Holocene large-scale meltwater discharge from Greenland documented by foraminifera and sediment parameters |
title_full_unstemmed |
Early Holocene large-scale meltwater discharge from Greenland documented by foraminifera and sediment parameters |
title_sort |
early holocene large-scale meltwater discharge from greenland documented by foraminifera and sediment parameters |
publishDate |
2013 |
url |
https://pure.au.dk/portal/en/publications/9bd1813b-b567-4d22-8a0c-2d8b327afac0 https://doi.org/10.1016/j.palaeo.2012.04.006 http://www.scopus.com/inward/record.url?scp=84888199893&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Glacial Lake Greenland |
geographic_facet |
Glacial Lake Greenland |
genre |
Greenland Ice Sheet Labrador Sea North Atlantic |
genre_facet |
Greenland Ice Sheet Labrador Sea North Atlantic |
op_source |
Seidenkrantz , M-S , Ebbesen , H , Aagaard-Sørensen , S , Moros , M , Lloyd , J M , Olsen , J , Knudsen , M F & Kuijpers , A 2013 , ' Early Holocene large-scale meltwater discharge from Greenland documented by foraminifera and sediment parameters ' , Palaeogeography, Palaeoclimatology, Palaeoecology , vol. 391 , no. Part A , pp. 71-81 . https://doi.org/10.1016/j.palaeo.2012.04.006 |
op_relation |
https://pure.au.dk/portal/en/publications/9bd1813b-b567-4d22-8a0c-2d8b327afac0 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.palaeo.2012.04.006 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
391 |
container_start_page |
71 |
op_container_end_page |
81 |
_version_ |
1798846435526967296 |