Evolution of the East Greenland Current between 1150 and 1740 AD, revealed by diatom-based sea surface temperature and sea-ice concentration reconstructions
Sediment core MD99-2322 from the East Greenland shelf has been studied to assess the variability of the East Greenland Current between 1150 and 1740 AD. Only the top 100 cm of the high-resolution core—with a 4-year resolution through the upper 20 cm, and a 10-year resolution through the remaining se...
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Norwegian Polar Institute
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ftjpolarres:oai:journals.openacademia.net:article/2819 2023-05-15T16:03:32+02:00 Evolution of the East Greenland Current between 1150 and 1740 AD, revealed by diatom-based sea surface temperature and sea-ice concentration reconstructions Justwan, Aurélie Koç, Nalân 2009-08-01 application/pdf https://polarresearch.net/index.php/polar/article/view/2819 https://doi.org/10.3402/polar.v28i2.6110 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2819/6446 https://polarresearch.net/index.php/polar/article/view/2819 doi:10.3402/polar.v28i2.6110 Copyright (c) 2018 Polar Research Polar Research; Vol. 28 No. 2 (2009); 165-176 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2009 ftjpolarres https://doi.org/10.3402/polar.v28i2.6110 2021-11-11T19:13:09Z Sediment core MD99-2322 from the East Greenland shelf has been studied to assess the variability of the East Greenland Current between 1150 and 1740 AD. Only the top 100 cm of the high-resolution core—with a 4-year resolution through the upper 20 cm, and a 10-year resolution through the remaining section—was studied. Diatoms were utilized to reconstruct both the August sea-surface temperature (SST) and the May sea-ice concentration, using the weighted averages–partial least squares and maximum likelihood transfer function methods, respectively. The record can be divided into three periods: two periods of relatively stable August SSTs and May sea-ice concentrations, separated by a period of higher August SSTs and decreasing May sea-ice concentrations between 1500 and 1670 AD, and between 1450 and 1610 AD, respectively. Both trends are statistically significant, based on the SIZER (significant zero crossing of the derivatives) analysis of the records. These changes are explained by a decrease in the strength of the East Greenland Current between 1450 and 1670 AD, which was responsible for bringing cold polar water and sea ice to the core site. Simultaneous changes observed in both these parameters points to a strong coupling between them. Because of the high resolution of the record, the natural variability of the system over the period of almost 700 years can be assessed. This variability is about 1°C (_0.9°C) for August SSTs and 12% (_7.4%) for May sea-ice concentrations. Article in Journal/Newspaper East Greenland east greenland current Greenland Polar Research Sea ice Polar Research (E-Journal) Greenland Polar Research 28 2 |
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Polar Research (E-Journal) |
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English |
description |
Sediment core MD99-2322 from the East Greenland shelf has been studied to assess the variability of the East Greenland Current between 1150 and 1740 AD. Only the top 100 cm of the high-resolution core—with a 4-year resolution through the upper 20 cm, and a 10-year resolution through the remaining section—was studied. Diatoms were utilized to reconstruct both the August sea-surface temperature (SST) and the May sea-ice concentration, using the weighted averages–partial least squares and maximum likelihood transfer function methods, respectively. The record can be divided into three periods: two periods of relatively stable August SSTs and May sea-ice concentrations, separated by a period of higher August SSTs and decreasing May sea-ice concentrations between 1500 and 1670 AD, and between 1450 and 1610 AD, respectively. Both trends are statistically significant, based on the SIZER (significant zero crossing of the derivatives) analysis of the records. These changes are explained by a decrease in the strength of the East Greenland Current between 1450 and 1670 AD, which was responsible for bringing cold polar water and sea ice to the core site. Simultaneous changes observed in both these parameters points to a strong coupling between them. Because of the high resolution of the record, the natural variability of the system over the period of almost 700 years can be assessed. This variability is about 1°C (_0.9°C) for August SSTs and 12% (_7.4%) for May sea-ice concentrations. |
format |
Article in Journal/Newspaper |
author |
Justwan, Aurélie Koç, Nalân |
spellingShingle |
Justwan, Aurélie Koç, Nalân Evolution of the East Greenland Current between 1150 and 1740 AD, revealed by diatom-based sea surface temperature and sea-ice concentration reconstructions |
author_facet |
Justwan, Aurélie Koç, Nalân |
author_sort |
Justwan, Aurélie |
title |
Evolution of the East Greenland Current between 1150 and 1740 AD, revealed by diatom-based sea surface temperature and sea-ice concentration reconstructions |
title_short |
Evolution of the East Greenland Current between 1150 and 1740 AD, revealed by diatom-based sea surface temperature and sea-ice concentration reconstructions |
title_full |
Evolution of the East Greenland Current between 1150 and 1740 AD, revealed by diatom-based sea surface temperature and sea-ice concentration reconstructions |
title_fullStr |
Evolution of the East Greenland Current between 1150 and 1740 AD, revealed by diatom-based sea surface temperature and sea-ice concentration reconstructions |
title_full_unstemmed |
Evolution of the East Greenland Current between 1150 and 1740 AD, revealed by diatom-based sea surface temperature and sea-ice concentration reconstructions |
title_sort |
evolution of the east greenland current between 1150 and 1740 ad, revealed by diatom-based sea surface temperature and sea-ice concentration reconstructions |
publisher |
Norwegian Polar Institute |
publishDate |
2009 |
url |
https://polarresearch.net/index.php/polar/article/view/2819 https://doi.org/10.3402/polar.v28i2.6110 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland east greenland current Greenland Polar Research Sea ice |
genre_facet |
East Greenland east greenland current Greenland Polar Research Sea ice |
op_source |
Polar Research; Vol. 28 No. 2 (2009); 165-176 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2819/6446 https://polarresearch.net/index.php/polar/article/view/2819 doi:10.3402/polar.v28i2.6110 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v28i2.6110 |
container_title |
Polar Research |
container_volume |
28 |
container_issue |
2 |
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1766399219443171328 |