KNR197-10CDH42 (Laurentian fan, Western North Atlantic) paleoceanographic data (Last Glacial Maximum)
Millennial scale events marked by the contribution of detrital sand are recorded in North Atlantic sediments during the Last Glacial Maximum (LGM), between Heinrich events (HE) 1 and 2, and left their imprint on Laurentian Fan (LF – 43◦N) sediments off eastern Canada. The LF counterpart of the wellk...
Published in: | Climate of the Past |
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Language: | English |
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2022
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.943366 https://doi.org/10.1594/PANGAEA.943366 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.943366 2024-09-30T14:36:38+00:00 KNR197-10CDH42 (Laurentian fan, Western North Atlantic) paleoceanographic data (Last Glacial Maximum) Gil, Isabelle M Keigwin, Lloyd D LATITUDE: 43.464500 * LONGITUDE: -54.755833 2022 application/zip, 7 datasets https://doi.pangaea.de/10.1594/PANGAEA.943366 https://doi.org/10.1594/PANGAEA.943366 en eng PANGAEA Gil, Isabelle M; Keigwin, Lloyd D (2018): Last Glacial Maximum surface water properties and circulation over Laurentian Fan, western North Atlantic. Earth and Planetary Science Letters, 500, 47-55, https://doi.org/10.1016/j.epsl.2018.07.038 https://doi.pangaea.de/10.1594/PANGAEA.943366 https://doi.org/10.1594/PANGAEA.943366 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess detrital events diatoms Ice Rafted Debris Last Glacial Maximum Laurentide Ice Sheet subglacial flows dataset bundled publication 2022 ftpangaea https://doi.org/10.1594/PANGAEA.94336610.1016/j.epsl.2018.07.038 2024-09-03T23:52:03Z Millennial scale events marked by the contribution of detrital sand are recorded in North Atlantic sediments during the Last Glacial Maximum (LGM), between Heinrich events (HE) 1 and 2, and left their imprint on Laurentian Fan (LF – 43◦N) sediments off eastern Canada. The LF counterpart of the wellknown detrital events consist of glacial red-brick sediments resulting from subglacial flows separated by olive-grey sediments appears at ∼21.4–19.9 and ∼19.5–18.65 cal kyr BP. High-resolution analyses of diatom assemblages and lithic grains coupled with planktonic oxygen isotopic records reveal that while the red sediment is almost barren of diatoms, foraminifera and lithics (>150 μm), they are abundant in the olive-grey sediment. Diatom assemblages reveal three phases during these events: (1) initial relatively warm/temperate conditions followed by (2) very cold surface water and drifting ice, and (3) a final phase characterized by relatively warmer waters and the appearance of detrital carbonate. Although these events possibly reflect the variability specific to the slope water region, they are likely the response to Atlantic Meridional Overturning Circulation perturbations and ice-sheet instability. Through a chain of mechanisms, meltwater inputs into the North Atlantic led ultimately to an increased volume of tropical waters and part of the heat stored in the subsurface was flushed by a brief convective episode that was not sustained, accounting for the return of cold conditions after the events. The sequence of mechanisms deduced from the paleo data here and elsewhere is consistent with previous modeling results. These data suggest that the detrital events between Heinrich event 1 and 2 may be synchronous across the North Atlantic, and that the LGM was probably not a time of prolonged steady state in the climate system. Other/Unknown Material Ice Sheet North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Canada ENVELOPE(-54.755833,-54.755833,43.464500,43.464500) Climate of the Past 20 8 1785 1816 |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
detrital events diatoms Ice Rafted Debris Last Glacial Maximum Laurentide Ice Sheet subglacial flows |
spellingShingle |
detrital events diatoms Ice Rafted Debris Last Glacial Maximum Laurentide Ice Sheet subglacial flows Gil, Isabelle M Keigwin, Lloyd D KNR197-10CDH42 (Laurentian fan, Western North Atlantic) paleoceanographic data (Last Glacial Maximum) |
topic_facet |
detrital events diatoms Ice Rafted Debris Last Glacial Maximum Laurentide Ice Sheet subglacial flows |
description |
Millennial scale events marked by the contribution of detrital sand are recorded in North Atlantic sediments during the Last Glacial Maximum (LGM), between Heinrich events (HE) 1 and 2, and left their imprint on Laurentian Fan (LF – 43◦N) sediments off eastern Canada. The LF counterpart of the wellknown detrital events consist of glacial red-brick sediments resulting from subglacial flows separated by olive-grey sediments appears at ∼21.4–19.9 and ∼19.5–18.65 cal kyr BP. High-resolution analyses of diatom assemblages and lithic grains coupled with planktonic oxygen isotopic records reveal that while the red sediment is almost barren of diatoms, foraminifera and lithics (>150 μm), they are abundant in the olive-grey sediment. Diatom assemblages reveal three phases during these events: (1) initial relatively warm/temperate conditions followed by (2) very cold surface water and drifting ice, and (3) a final phase characterized by relatively warmer waters and the appearance of detrital carbonate. Although these events possibly reflect the variability specific to the slope water region, they are likely the response to Atlantic Meridional Overturning Circulation perturbations and ice-sheet instability. Through a chain of mechanisms, meltwater inputs into the North Atlantic led ultimately to an increased volume of tropical waters and part of the heat stored in the subsurface was flushed by a brief convective episode that was not sustained, accounting for the return of cold conditions after the events. The sequence of mechanisms deduced from the paleo data here and elsewhere is consistent with previous modeling results. These data suggest that the detrital events between Heinrich event 1 and 2 may be synchronous across the North Atlantic, and that the LGM was probably not a time of prolonged steady state in the climate system. |
format |
Other/Unknown Material |
author |
Gil, Isabelle M Keigwin, Lloyd D |
author_facet |
Gil, Isabelle M Keigwin, Lloyd D |
author_sort |
Gil, Isabelle M |
title |
KNR197-10CDH42 (Laurentian fan, Western North Atlantic) paleoceanographic data (Last Glacial Maximum) |
title_short |
KNR197-10CDH42 (Laurentian fan, Western North Atlantic) paleoceanographic data (Last Glacial Maximum) |
title_full |
KNR197-10CDH42 (Laurentian fan, Western North Atlantic) paleoceanographic data (Last Glacial Maximum) |
title_fullStr |
KNR197-10CDH42 (Laurentian fan, Western North Atlantic) paleoceanographic data (Last Glacial Maximum) |
title_full_unstemmed |
KNR197-10CDH42 (Laurentian fan, Western North Atlantic) paleoceanographic data (Last Glacial Maximum) |
title_sort |
knr197-10cdh42 (laurentian fan, western north atlantic) paleoceanographic data (last glacial maximum) |
publisher |
PANGAEA |
publishDate |
2022 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.943366 https://doi.org/10.1594/PANGAEA.943366 |
op_coverage |
LATITUDE: 43.464500 * LONGITUDE: -54.755833 |
long_lat |
ENVELOPE(-54.755833,-54.755833,43.464500,43.464500) |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Ice Sheet North Atlantic |
genre_facet |
Ice Sheet North Atlantic |
op_relation |
Gil, Isabelle M; Keigwin, Lloyd D (2018): Last Glacial Maximum surface water properties and circulation over Laurentian Fan, western North Atlantic. Earth and Planetary Science Letters, 500, 47-55, https://doi.org/10.1016/j.epsl.2018.07.038 https://doi.pangaea.de/10.1594/PANGAEA.943366 https://doi.org/10.1594/PANGAEA.943366 |
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.94336610.1016/j.epsl.2018.07.038 |
container_title |
Climate of the Past |
container_volume |
20 |
container_issue |
8 |
container_start_page |
1785 |
op_container_end_page |
1816 |
_version_ |
1811639664315990016 |