Holocene palaeoceanographic evolution off West Greenland
Benthic foraminiferal assemblages from a core southwest of Disko Bugt provide a Holocene perspective (last ~7 ka BP) on ice-sheet/ocean interactions between the West Greenland Current (WGC) and the West Greenland ice sheet. Changes in the fauna reveal significant variations in the water mass propert...
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.898319 https://doi.org/10.1594/PANGAEA.898319 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.898319 2024-09-15T18:03:44+00:00 Holocene palaeoceanographic evolution off West Greenland Perner, Kerstin Moros, Matthias Jennings, Anne E Lloyd, Jeremy M Knudsen, Karen Luise LATITUDE: 68.470000 * LONGITUDE: -54.001000 2019 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.898319 https://doi.org/10.1594/PANGAEA.898319 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.898319 https://doi.org/10.1594/PANGAEA.898319 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess Deutsche Forschungsgemeinschaft, Bonn Supplement to: Perner, Kerstin; Moros, Matthias; Jennings, Anne E; Lloyd, Jeremy M; Knudsen, Karen Luise (2013): Holocene palaeoceanographic evolution off West Greenland. The Holocene, 23(3), 374-387, https://doi.org/10.1177/0959683612460785 Benthic foraminifera EGC GREENClim Holocene IC ocean forcing WGC dataset publication series 2019 ftpangaea https://doi.org/10.1594/PANGAEA.89831910.1177/0959683612460785 2024-07-24T02:31:21Z Benthic foraminiferal assemblages from a core southwest of Disko Bugt provide a Holocene perspective (last ~7 ka BP) on ice-sheet/ocean interactions between the West Greenland Current (WGC) and the West Greenland ice sheet. Changes in the fauna reveal significant variations in the water mass properties (temperature and salinity) of the WGC through time. From 7.3 to 6.2 ka BP, a relatively warm/strong WGC influences ice-sheet melt in Disko Bugt and causes enhanced meltwater production, resulting in low surface-water productivity. The most favourable oceanographic conditions occur from 5.5 to 3.5 ka BP, associated with 'thermal optimum-like' conditions, encompassing minimum ice sheet extent in the Disko Bugt area. These conditions are attributed to: (1) reduced meltwater influence as the ice sheet is land based and (2) enhanced contribution of warm/saline water masses from the Irminger Current to the WGC. The transition into the late Holocene (last ~3.5 ka BP) is characterized by a cooling of oceanographic conditions, caused by increased advection of cold/low-salinity water masses from the East Greenland Current. A longer-term late-Holocene cooling trend within the WGC is attributed to the onset of Neoglacial cooling within the North Atlantic region. Superimposed on this cooling trend, multicentennial-scale variability within the WGC matches reconstructions from a nearby coring site in Disko Bugt as follows: (1) cooling at ~2.5 ka BP, linked to the 2.7 ka BP 'cooling event'; (2) a warm phase centred at 1.8 ka BP, associated with the 'Roman Warm Period'; (3) slight warming between 1.4 and 0.9 ka BP, linked to the 'Medieval Climate Anomaly'; (4) severe cooling of the WGC after 0.9 ka BP, culminating at 0.3 ka BP during the 'Little Ice Age'. We show that multicentennial-scale palaeoceanography variability along the West Greenland margin is driven by ocean forcing, i.e. variations in the relative contribution of Atlantic (Irminger Current) and Polar (East Greenland Current) water masses to the WGC during the last ~7 ... Other/Unknown Material Disko bugt East Greenland east greenland current Greenland Ice Sheet North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-54.001000,-54.001000,68.470000,68.470000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Benthic foraminifera EGC GREENClim Holocene IC ocean forcing WGC |
spellingShingle |
Benthic foraminifera EGC GREENClim Holocene IC ocean forcing WGC Perner, Kerstin Moros, Matthias Jennings, Anne E Lloyd, Jeremy M Knudsen, Karen Luise Holocene palaeoceanographic evolution off West Greenland |
topic_facet |
Benthic foraminifera EGC GREENClim Holocene IC ocean forcing WGC |
description |
Benthic foraminiferal assemblages from a core southwest of Disko Bugt provide a Holocene perspective (last ~7 ka BP) on ice-sheet/ocean interactions between the West Greenland Current (WGC) and the West Greenland ice sheet. Changes in the fauna reveal significant variations in the water mass properties (temperature and salinity) of the WGC through time. From 7.3 to 6.2 ka BP, a relatively warm/strong WGC influences ice-sheet melt in Disko Bugt and causes enhanced meltwater production, resulting in low surface-water productivity. The most favourable oceanographic conditions occur from 5.5 to 3.5 ka BP, associated with 'thermal optimum-like' conditions, encompassing minimum ice sheet extent in the Disko Bugt area. These conditions are attributed to: (1) reduced meltwater influence as the ice sheet is land based and (2) enhanced contribution of warm/saline water masses from the Irminger Current to the WGC. The transition into the late Holocene (last ~3.5 ka BP) is characterized by a cooling of oceanographic conditions, caused by increased advection of cold/low-salinity water masses from the East Greenland Current. A longer-term late-Holocene cooling trend within the WGC is attributed to the onset of Neoglacial cooling within the North Atlantic region. Superimposed on this cooling trend, multicentennial-scale variability within the WGC matches reconstructions from a nearby coring site in Disko Bugt as follows: (1) cooling at ~2.5 ka BP, linked to the 2.7 ka BP 'cooling event'; (2) a warm phase centred at 1.8 ka BP, associated with the 'Roman Warm Period'; (3) slight warming between 1.4 and 0.9 ka BP, linked to the 'Medieval Climate Anomaly'; (4) severe cooling of the WGC after 0.9 ka BP, culminating at 0.3 ka BP during the 'Little Ice Age'. We show that multicentennial-scale palaeoceanography variability along the West Greenland margin is driven by ocean forcing, i.e. variations in the relative contribution of Atlantic (Irminger Current) and Polar (East Greenland Current) water masses to the WGC during the last ~7 ... |
format |
Other/Unknown Material |
author |
Perner, Kerstin Moros, Matthias Jennings, Anne E Lloyd, Jeremy M Knudsen, Karen Luise |
author_facet |
Perner, Kerstin Moros, Matthias Jennings, Anne E Lloyd, Jeremy M Knudsen, Karen Luise |
author_sort |
Perner, Kerstin |
title |
Holocene palaeoceanographic evolution off West Greenland |
title_short |
Holocene palaeoceanographic evolution off West Greenland |
title_full |
Holocene palaeoceanographic evolution off West Greenland |
title_fullStr |
Holocene palaeoceanographic evolution off West Greenland |
title_full_unstemmed |
Holocene palaeoceanographic evolution off West Greenland |
title_sort |
holocene palaeoceanographic evolution off west greenland |
publisher |
PANGAEA |
publishDate |
2019 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.898319 https://doi.org/10.1594/PANGAEA.898319 |
op_coverage |
LATITUDE: 68.470000 * LONGITUDE: -54.001000 |
long_lat |
ENVELOPE(-54.001000,-54.001000,68.470000,68.470000) |
genre |
Disko bugt East Greenland east greenland current Greenland Ice Sheet North Atlantic |
genre_facet |
Disko bugt East Greenland east greenland current Greenland Ice Sheet North Atlantic |
op_source |
Deutsche Forschungsgemeinschaft, Bonn Supplement to: Perner, Kerstin; Moros, Matthias; Jennings, Anne E; Lloyd, Jeremy M; Knudsen, Karen Luise (2013): Holocene palaeoceanographic evolution off West Greenland. The Holocene, 23(3), 374-387, https://doi.org/10.1177/0959683612460785 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.898319 https://doi.org/10.1594/PANGAEA.898319 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.89831910.1177/0959683612460785 |
_version_ |
1810441219337093120 |