Holocene sedimentation rates in the Northwest Passage
Palynological, geochemical, and physical records were used to document Holocene paleoceanographic changes in marine sediment core from Dease Strait in the western part of the main axis of the Northwest Passage (core 2005-804-006 PC latitude 68°59.552'N, longitude 106°34.413'W). Quantitativ...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.831582 2023-05-15T14:25:42+02:00 Holocene sedimentation rates in the Northwest Passage Ledu, David Rochon, André de Vernal, Anne Barletta, Mario St-Onge, Guillaume MEDIAN LATITUDE: 70.388645 * MEDIAN LONGITUDE: -101.125447 * SOUTH-BOUND LATITUDE: 68.992530 * WEST-BOUND LONGITUDE: -106.573550 * NORTH-BOUND LATITUDE: 74.269250 * EAST-BOUND LONGITUDE: -81.195000 2010-04-08 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.831582 https://doi.org/10.1594/PANGAEA.831582 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.831582 https://doi.org/10.1594/PANGAEA.831582 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Ledu, David; Rochon, André; de Vernal, Anne; Barletta, Mario; St-Onge, Guillaume (2010): Holocene sea ice history and climate variability along the main axis of the Northwest Passage, Canadian Arctic. Paleoceanography, 25(2), PA2213, https://doi.org/10.1029/2009PA001817 Dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.831582 https://doi.org/10.1029/2009PA001817 2023-01-20T07:33:16Z Palynological, geochemical, and physical records were used to document Holocene paleoceanographic changes in marine sediment core from Dease Strait in the western part of the main axis of the Northwest Passage (core 2005-804-006 PC latitude 68°59.552'N, longitude 106°34.413'W). Quantitative estimates of past sea surface conditions were inferred from the modern analog technique applied to dinoflagellate cyst assemblages. The chronology of core 2005-804-006 PC is based on a combined use of the paleomagnetic secular variation records and the CALS7K.2 time-varying spherical harmonic model of the geomagnetic field. The age-depth model indicates that the core spans the last ~7700 cal years B.P., with a sedimentation rate of 61 cm/ka. The reconstructed sea surface parameters were compared with those from Barrow Strait and Lancaster Sound (cores 2005-804-004 PC and 2004-804-009 PC, respectively), which allowed us to draw a millennial-scale Holocene sea ice history along the main axis of the Northwest Passage (MANWP). Overall, our data are in good agreement with previous studies based on bowhead whale remains. However, dinoflagellate sea surface based reconstructions suggest several new features. The presence of dinoflagellate cysts in the three cores for most of the Holocene indicates that the MANWP was partially ice-free over the last 10,000 years. This suggests that the recent warming observed in the MANWP could be part of the natural climate variability at the millennial time scale, whereas anthropogenic forcing could have accelerated the warming over the past decades. We associate Holocene climate variability in the MANWP with a large-scale atmospheric pattern, such as the Arctic Oscillation, which may have operated since the early Holocene. In addition to a large-scale pattern, more local conditions such as coastal current, tidal effects, or ice cap proximity may have played a role on the regional sea ice cover. These findings highlight the need to further develop regional investigations in the Arctic to provide ... Dataset Arctic Arctic bowhead whale Ice cap Lancaster Sound Northwest passage Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Arctic Northwest Passage Lancaster Sound ENVELOPE(-83.999,-83.999,74.218,74.218) Barrow Strait ENVELOPE(-94.168,-94.168,74.402,74.402) Dease Strait ENVELOPE(-107.502,-107.502,68.834,68.834) ENVELOPE(-106.573550,-81.195000,74.269250,68.992530) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
Palynological, geochemical, and physical records were used to document Holocene paleoceanographic changes in marine sediment core from Dease Strait in the western part of the main axis of the Northwest Passage (core 2005-804-006 PC latitude 68°59.552'N, longitude 106°34.413'W). Quantitative estimates of past sea surface conditions were inferred from the modern analog technique applied to dinoflagellate cyst assemblages. The chronology of core 2005-804-006 PC is based on a combined use of the paleomagnetic secular variation records and the CALS7K.2 time-varying spherical harmonic model of the geomagnetic field. The age-depth model indicates that the core spans the last ~7700 cal years B.P., with a sedimentation rate of 61 cm/ka. The reconstructed sea surface parameters were compared with those from Barrow Strait and Lancaster Sound (cores 2005-804-004 PC and 2004-804-009 PC, respectively), which allowed us to draw a millennial-scale Holocene sea ice history along the main axis of the Northwest Passage (MANWP). Overall, our data are in good agreement with previous studies based on bowhead whale remains. However, dinoflagellate sea surface based reconstructions suggest several new features. The presence of dinoflagellate cysts in the three cores for most of the Holocene indicates that the MANWP was partially ice-free over the last 10,000 years. This suggests that the recent warming observed in the MANWP could be part of the natural climate variability at the millennial time scale, whereas anthropogenic forcing could have accelerated the warming over the past decades. We associate Holocene climate variability in the MANWP with a large-scale atmospheric pattern, such as the Arctic Oscillation, which may have operated since the early Holocene. In addition to a large-scale pattern, more local conditions such as coastal current, tidal effects, or ice cap proximity may have played a role on the regional sea ice cover. These findings highlight the need to further develop regional investigations in the Arctic to provide ... |
format |
Dataset |
author |
Ledu, David Rochon, André de Vernal, Anne Barletta, Mario St-Onge, Guillaume |
spellingShingle |
Ledu, David Rochon, André de Vernal, Anne Barletta, Mario St-Onge, Guillaume Holocene sedimentation rates in the Northwest Passage |
author_facet |
Ledu, David Rochon, André de Vernal, Anne Barletta, Mario St-Onge, Guillaume |
author_sort |
Ledu, David |
title |
Holocene sedimentation rates in the Northwest Passage |
title_short |
Holocene sedimentation rates in the Northwest Passage |
title_full |
Holocene sedimentation rates in the Northwest Passage |
title_fullStr |
Holocene sedimentation rates in the Northwest Passage |
title_full_unstemmed |
Holocene sedimentation rates in the Northwest Passage |
title_sort |
holocene sedimentation rates in the northwest passage |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.831582 https://doi.org/10.1594/PANGAEA.831582 |
op_coverage |
MEDIAN LATITUDE: 70.388645 * MEDIAN LONGITUDE: -101.125447 * SOUTH-BOUND LATITUDE: 68.992530 * WEST-BOUND LONGITUDE: -106.573550 * NORTH-BOUND LATITUDE: 74.269250 * EAST-BOUND LONGITUDE: -81.195000 |
long_lat |
ENVELOPE(-83.999,-83.999,74.218,74.218) ENVELOPE(-94.168,-94.168,74.402,74.402) ENVELOPE(-107.502,-107.502,68.834,68.834) ENVELOPE(-106.573550,-81.195000,74.269250,68.992530) |
geographic |
Arctic Northwest Passage Lancaster Sound Barrow Strait Dease Strait |
geographic_facet |
Arctic Northwest Passage Lancaster Sound Barrow Strait Dease Strait |
genre |
Arctic Arctic bowhead whale Ice cap Lancaster Sound Northwest passage Sea ice |
genre_facet |
Arctic Arctic bowhead whale Ice cap Lancaster Sound Northwest passage Sea ice |
op_source |
Supplement to: Ledu, David; Rochon, André; de Vernal, Anne; Barletta, Mario; St-Onge, Guillaume (2010): Holocene sea ice history and climate variability along the main axis of the Northwest Passage, Canadian Arctic. Paleoceanography, 25(2), PA2213, https://doi.org/10.1029/2009PA001817 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.831582 https://doi.org/10.1594/PANGAEA.831582 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.831582 https://doi.org/10.1029/2009PA001817 |
_version_ |
1766298158323728384 |