Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene
We address here the specific timing and amplitude of sea‐surface conditions and productivity changes off SW Greenland, northern Labrador Sea, in response to the high deglacial meltwater rates, the Early Holocene maximum insolation and Neoglacial cooling. Dinocyst assemblages from sediment cores coll...
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crwiley:10.1111/bor.12514 2024-09-09T19:42:39+00:00 Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene Allan, Estelle de Vernal, Anne Seidenkrantz, Marit‐Solveig Briner, Jason P. Hillaire‐Marcel, Claude Pearce, Christof Meire, Lorenz Røy, Hans Mathiasen, Anders Møller Nielsen, Mikkel Thy Plesner, Jane Lund Perner, Kerstin Det Frie Forskningsråd Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada Fonds de recherche du Québec – Nature et technologies National Science Foundation 2021 http://dx.doi.org/10.1111/bor.12514 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12514 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12514 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/bor.12514 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 50, issue 3, page 631-651 ISSN 0300-9483 1502-3885 journal-article 2021 crwiley https://doi.org/10.1111/bor.12514 2024-06-20T04:22:57Z We address here the specific timing and amplitude of sea‐surface conditions and productivity changes off SW Greenland, northern Labrador Sea, in response to the high deglacial meltwater rates, the Early Holocene maximum insolation and Neoglacial cooling. Dinocyst assemblages from sediment cores collected off Nuuk were used to set up quantitative records of sea ice cover, seasonal sea‐surface temperature (SST), salinity (SSS), and primary productivity, with a centennial to millennial scale resolution. Until ~10 ka BP, ice‐proximal conditions are suggested by the quasi‐exclusive dominance of heterotrophic taxa and low dinocyst concentrations. At about 10 ka BP, an increase in species diversity and abundance of phototrophic taxa marks the onset of interglacial conditions at a regional scale, with summer SST reaching up to 10 °C between 8 and 5 ka BP, thus in phase with the Holocene Thermal Maximum as recorded in the southern Greenlandic areas/northern Labrador Sea. During this interval, low SSS but high productivity prevailed in response to high meltwater discharge and nutrient inputs from the Greenland Ice Sheet. After ~5 ka BP, a decrease in phototrophic taxa marks a two‐step cooling of surface waters. The first started at ~5 ka BP, and the second at ~3 ka BP, with a shift toward colder conditions and higher SSS suggesting reduced meltwater discharge during the Neoglacial. This second step coincides with the disappearance of the Saqqaq culture. The gap in human occupation in west Greenland, between the Dorset and the Norse settlements from 2000 to 1000 years BP, might be linked to high amplitude and high frequency variability of ocean and climate conditions. Article in Journal/Newspaper Greenland greenlandic Ice Sheet Labrador Sea Nuuk Saqqaq Saqqaq culture Sea ice Wiley Online Library Greenland Nuuk ENVELOPE(-52.150,-52.150,68.717,68.717) Boreas 50 3 631 651 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
We address here the specific timing and amplitude of sea‐surface conditions and productivity changes off SW Greenland, northern Labrador Sea, in response to the high deglacial meltwater rates, the Early Holocene maximum insolation and Neoglacial cooling. Dinocyst assemblages from sediment cores collected off Nuuk were used to set up quantitative records of sea ice cover, seasonal sea‐surface temperature (SST), salinity (SSS), and primary productivity, with a centennial to millennial scale resolution. Until ~10 ka BP, ice‐proximal conditions are suggested by the quasi‐exclusive dominance of heterotrophic taxa and low dinocyst concentrations. At about 10 ka BP, an increase in species diversity and abundance of phototrophic taxa marks the onset of interglacial conditions at a regional scale, with summer SST reaching up to 10 °C between 8 and 5 ka BP, thus in phase with the Holocene Thermal Maximum as recorded in the southern Greenlandic areas/northern Labrador Sea. During this interval, low SSS but high productivity prevailed in response to high meltwater discharge and nutrient inputs from the Greenland Ice Sheet. After ~5 ka BP, a decrease in phototrophic taxa marks a two‐step cooling of surface waters. The first started at ~5 ka BP, and the second at ~3 ka BP, with a shift toward colder conditions and higher SSS suggesting reduced meltwater discharge during the Neoglacial. This second step coincides with the disappearance of the Saqqaq culture. The gap in human occupation in west Greenland, between the Dorset and the Norse settlements from 2000 to 1000 years BP, might be linked to high amplitude and high frequency variability of ocean and climate conditions. |
author2 |
Det Frie Forskningsråd Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada Fonds de recherche du Québec – Nature et technologies National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Allan, Estelle de Vernal, Anne Seidenkrantz, Marit‐Solveig Briner, Jason P. Hillaire‐Marcel, Claude Pearce, Christof Meire, Lorenz Røy, Hans Mathiasen, Anders Møller Nielsen, Mikkel Thy Plesner, Jane Lund Perner, Kerstin |
spellingShingle |
Allan, Estelle de Vernal, Anne Seidenkrantz, Marit‐Solveig Briner, Jason P. Hillaire‐Marcel, Claude Pearce, Christof Meire, Lorenz Røy, Hans Mathiasen, Anders Møller Nielsen, Mikkel Thy Plesner, Jane Lund Perner, Kerstin Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene |
author_facet |
Allan, Estelle de Vernal, Anne Seidenkrantz, Marit‐Solveig Briner, Jason P. Hillaire‐Marcel, Claude Pearce, Christof Meire, Lorenz Røy, Hans Mathiasen, Anders Møller Nielsen, Mikkel Thy Plesner, Jane Lund Perner, Kerstin |
author_sort |
Allan, Estelle |
title |
Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene |
title_short |
Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene |
title_full |
Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene |
title_fullStr |
Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene |
title_full_unstemmed |
Insolation vs. meltwater control of productivity and sea surface conditions off SW Greenland during the Holocene |
title_sort |
insolation vs. meltwater control of productivity and sea surface conditions off sw greenland during the holocene |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/bor.12514 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bor.12514 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/bor.12514 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/bor.12514 |
long_lat |
ENVELOPE(-52.150,-52.150,68.717,68.717) |
geographic |
Greenland Nuuk |
geographic_facet |
Greenland Nuuk |
genre |
Greenland greenlandic Ice Sheet Labrador Sea Nuuk Saqqaq Saqqaq culture Sea ice |
genre_facet |
Greenland greenlandic Ice Sheet Labrador Sea Nuuk Saqqaq Saqqaq culture Sea ice |
op_source |
Boreas volume 50, issue 3, page 631-651 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bor.12514 |
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Boreas |
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50 |
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3 |
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631 |
op_container_end_page |
651 |
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1809911901522493440 |