Ice-ocean interactions at the Northeast Greenland Ice stream (NEGIS) over the past 11,000 years
Recent observations have identified increased mass loss from Greenland marine-terminating outlet glaciers (MTOG) with implications for global sea-level rise and wider ocean circulation. The flow of Atlantic-sourced waters to the Greenland margin is thought to be a major control on MTOG behaviour. In...
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2023
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Online Access: | http://hdl.handle.net/10138/358356 |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/358356 2024-01-07T09:43:31+01:00 Ice-ocean interactions at the Northeast Greenland Ice stream (NEGIS) over the past 11,000 years Lloyd, J. M. Ribeiro, S. Weckstrom, K. Callard, L. Cofaigh, C. Leng, M. J. Gulliver, P. Roberts, D. H. Helsinki Institute of Sustainability Science (HELSUS) Ecosystems and Environment Research Programme Environmental Change Research Unit (ECRU) 2023-06-05T07:00:02Z 19 application/pdf http://hdl.handle.net/10138/358356 eng eng Elsevier Scientific Publ. Co 10.1016/j.quascirev.2023.108068 Lloyd , J M , Ribeiro , S , Weckstrom , K , Callard , L , Cofaigh , C , Leng , M J , Gulliver , P & Roberts , D H 2023 , ' Ice-ocean interactions at the Northeast Greenland Ice stream (NEGIS) over the past 11,000 years ' , Quaternary Science Reviews , vol. 308 . https://doi.org/10.1016/j.quascirev.2023.108068 ORCID: /0000-0002-3889-0788/work/136647337 0b52a200-5a10-4d62-8de6-6e0b6d8fafd4 http://hdl.handle.net/10138/358356 000985221200001 cc_by openAccess info:eu-repo/semantics/openAccess Dinocysts Foraminifera Greenland Holocene Marine cores Paleoceanography Sedimentology 1171 Geosciences Article publishedVersion 2023 ftunivhelsihelda 2023-12-14T00:11:38Z Recent observations have identified increased mass loss from Greenland marine-terminating outlet glaciers (MTOG) with implications for global sea-level rise and wider ocean circulation. The flow of Atlantic-sourced waters to the Greenland margin is thought to be a major control on MTOG behaviour. Investigation of longer-term records of the role of Atlantic-sourced waters on MOTG dynamics are needed to improve understanding of potential future trends in MTOG behaviour. Here we present a multi-proxy study (benthic and planktic foraminifera, dinoflagellate cysts, diatoms, stable isotopes, sea ice biomarkers and sedimentological analyses) from core PS100-198 on the northeast Greenland shelf to investigate the interaction between the Northeast Greenland Ice Stream (NEGIS) and ocean circulation through the Holocene. Proximal glaciomarine conditions at the base of the core indicate deglaciation before 10.9 ka cal BP with the relatively warm Atlantic Water present through advection of the Return Atlantic Current (RAC) across the shelf. The advection of RAC increased through the early Holocene reaching peak subsurface warmth from 8 to 9 ka cal BP. Surface conditions at this time were charac-terised by heavy sea-ice cover. During the mid-to late Holocene (c. 7e2 ka cal BP) advection of RAC weakened with cooler subsurface waters, but with an amelioration of surface conditions characterised by seasonal sea ice. From c. 2 ka cal BP, during the late Holocene, surface conditions continued to improve with continued seasonal sea-ice cover while subsurface proxies record an increase in RAC advection. The last c. 100 years represent the most ameliorated surface conditions through the Holocene and with subsurface conditions as warm as the early Holocene peak. This coincided with the final break up of ice within 79N fjord and retreat of NEGIS to the Holocene minimum position. Current conditions, therefore, suggest the present-day ice shelf within 79N fjord is most likely susceptible to collapse in the near future. This study ... Article in Journal/Newspaper Greenland Ice Shelf Sea ice HELDA – University of Helsinki Open Repository Greenland Quaternary Science Reviews 308 108068 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Dinocysts Foraminifera Greenland Holocene Marine cores Paleoceanography Sedimentology 1171 Geosciences |
spellingShingle |
Dinocysts Foraminifera Greenland Holocene Marine cores Paleoceanography Sedimentology 1171 Geosciences Lloyd, J. M. Ribeiro, S. Weckstrom, K. Callard, L. Cofaigh, C. Leng, M. J. Gulliver, P. Roberts, D. H. Ice-ocean interactions at the Northeast Greenland Ice stream (NEGIS) over the past 11,000 years |
topic_facet |
Dinocysts Foraminifera Greenland Holocene Marine cores Paleoceanography Sedimentology 1171 Geosciences |
description |
Recent observations have identified increased mass loss from Greenland marine-terminating outlet glaciers (MTOG) with implications for global sea-level rise and wider ocean circulation. The flow of Atlantic-sourced waters to the Greenland margin is thought to be a major control on MTOG behaviour. Investigation of longer-term records of the role of Atlantic-sourced waters on MOTG dynamics are needed to improve understanding of potential future trends in MTOG behaviour. Here we present a multi-proxy study (benthic and planktic foraminifera, dinoflagellate cysts, diatoms, stable isotopes, sea ice biomarkers and sedimentological analyses) from core PS100-198 on the northeast Greenland shelf to investigate the interaction between the Northeast Greenland Ice Stream (NEGIS) and ocean circulation through the Holocene. Proximal glaciomarine conditions at the base of the core indicate deglaciation before 10.9 ka cal BP with the relatively warm Atlantic Water present through advection of the Return Atlantic Current (RAC) across the shelf. The advection of RAC increased through the early Holocene reaching peak subsurface warmth from 8 to 9 ka cal BP. Surface conditions at this time were charac-terised by heavy sea-ice cover. During the mid-to late Holocene (c. 7e2 ka cal BP) advection of RAC weakened with cooler subsurface waters, but with an amelioration of surface conditions characterised by seasonal sea ice. From c. 2 ka cal BP, during the late Holocene, surface conditions continued to improve with continued seasonal sea-ice cover while subsurface proxies record an increase in RAC advection. The last c. 100 years represent the most ameliorated surface conditions through the Holocene and with subsurface conditions as warm as the early Holocene peak. This coincided with the final break up of ice within 79N fjord and retreat of NEGIS to the Holocene minimum position. Current conditions, therefore, suggest the present-day ice shelf within 79N fjord is most likely susceptible to collapse in the near future. This study ... |
author2 |
Helsinki Institute of Sustainability Science (HELSUS) Ecosystems and Environment Research Programme Environmental Change Research Unit (ECRU) |
format |
Article in Journal/Newspaper |
author |
Lloyd, J. M. Ribeiro, S. Weckstrom, K. Callard, L. Cofaigh, C. Leng, M. J. Gulliver, P. Roberts, D. H. |
author_facet |
Lloyd, J. M. Ribeiro, S. Weckstrom, K. Callard, L. Cofaigh, C. Leng, M. J. Gulliver, P. Roberts, D. H. |
author_sort |
Lloyd, J. M. |
title |
Ice-ocean interactions at the Northeast Greenland Ice stream (NEGIS) over the past 11,000 years |
title_short |
Ice-ocean interactions at the Northeast Greenland Ice stream (NEGIS) over the past 11,000 years |
title_full |
Ice-ocean interactions at the Northeast Greenland Ice stream (NEGIS) over the past 11,000 years |
title_fullStr |
Ice-ocean interactions at the Northeast Greenland Ice stream (NEGIS) over the past 11,000 years |
title_full_unstemmed |
Ice-ocean interactions at the Northeast Greenland Ice stream (NEGIS) over the past 11,000 years |
title_sort |
ice-ocean interactions at the northeast greenland ice stream (negis) over the past 11,000 years |
publisher |
Elsevier Scientific Publ. Co |
publishDate |
2023 |
url |
http://hdl.handle.net/10138/358356 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Shelf Sea ice |
genre_facet |
Greenland Ice Shelf Sea ice |
op_relation |
10.1016/j.quascirev.2023.108068 Lloyd , J M , Ribeiro , S , Weckstrom , K , Callard , L , Cofaigh , C , Leng , M J , Gulliver , P & Roberts , D H 2023 , ' Ice-ocean interactions at the Northeast Greenland Ice stream (NEGIS) over the past 11,000 years ' , Quaternary Science Reviews , vol. 308 . https://doi.org/10.1016/j.quascirev.2023.108068 ORCID: /0000-0002-3889-0788/work/136647337 0b52a200-5a10-4d62-8de6-6e0b6d8fafd4 http://hdl.handle.net/10138/358356 000985221200001 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
container_title |
Quaternary Science Reviews |
container_volume |
308 |
container_start_page |
108068 |
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1787424785279483904 |