Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55-8 ka BP
We present high-resolution records of upper ocean temperatures derived from Mg/Ca ratios of surface-dwelling Globigerina bulloides and subsurface-dwelling Neogloboquadrina pachyderma sinistral and the relative abundance of N. pachyderma sinistral for the period 55-8 ka BP from NE Atlantic sediment c...
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Amer Geophysical Union
2008
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Online Access: | https://archimer.ifremer.fr/doc/00237/34797/33340.pdf https://doi.org/10.1029/2008PA001631 https://archimer.ifremer.fr/doc/00237/34797/ |
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ftarchimer:oai:archimer.ifremer.fr:34797 2023-05-15T16:41:04+02:00 Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55-8 ka BP Peck, V. L. Hall, I. R. Zahn, R. Elderfield, H. 2008-09 application/pdf https://archimer.ifremer.fr/doc/00237/34797/33340.pdf https://doi.org/10.1029/2008PA001631 https://archimer.ifremer.fr/doc/00237/34797/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00237/34797/33340.pdf doi:10.1029/2008PA001631 https://archimer.ifremer.fr/doc/00237/34797/ Copyright 2008 by the American Geophysical Union info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2008-09 , Vol. 23 , N. 3 / PA3221 , P. 1-11 text Publication info:eu-repo/semantics/article 2008 ftarchimer https://doi.org/10.1029/2008PA001631 2021-09-23T20:25:26Z We present high-resolution records of upper ocean temperatures derived from Mg/Ca ratios of surface-dwelling Globigerina bulloides and subsurface-dwelling Neogloboquadrina pachyderma sinistral and the relative abundance of N. pachyderma sinistral for the period 55-8 ka BP from NE Atlantic sediment core MD01-2461. Millennial-scale temporal variability and longer-term trends in these records enable us to develop a detailed picture of past ocean conditions such as a weakening of thermocline intensity from marine isotope stage 3 (MIS 3) to the last glacial maximum (LGM). The correspondence of all temperature proxies and convergence of paired oxygen isotope (delta O-18) records from both planktonic species implies a breakdown in the thermocline and year-round mixing of the upper water column through the LGM, perhaps related to decreasing insolation and additional cooling in association with the expansion of the circum-North Atlantic ice sheets. Millennial-scale divergence in surface and subsurface temperatures and delta O-18 across the last glacial correspond to meltwater release and the development of a strong halocline associated with both Heinrich (H) events and instabilities of the NW European ice sheet. During such episodes, G. bulloides Mg/Ca appears to record ambient, even warming summer sea surface temperatures across H events while the other proxies record maximum cooling. Article in Journal/Newspaper Ice Sheet Neogloboquadrina pachyderma North Atlantic Northeast Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Paleoceanography 23 3 n/a n/a |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
We present high-resolution records of upper ocean temperatures derived from Mg/Ca ratios of surface-dwelling Globigerina bulloides and subsurface-dwelling Neogloboquadrina pachyderma sinistral and the relative abundance of N. pachyderma sinistral for the period 55-8 ka BP from NE Atlantic sediment core MD01-2461. Millennial-scale temporal variability and longer-term trends in these records enable us to develop a detailed picture of past ocean conditions such as a weakening of thermocline intensity from marine isotope stage 3 (MIS 3) to the last glacial maximum (LGM). The correspondence of all temperature proxies and convergence of paired oxygen isotope (delta O-18) records from both planktonic species implies a breakdown in the thermocline and year-round mixing of the upper water column through the LGM, perhaps related to decreasing insolation and additional cooling in association with the expansion of the circum-North Atlantic ice sheets. Millennial-scale divergence in surface and subsurface temperatures and delta O-18 across the last glacial correspond to meltwater release and the development of a strong halocline associated with both Heinrich (H) events and instabilities of the NW European ice sheet. During such episodes, G. bulloides Mg/Ca appears to record ambient, even warming summer sea surface temperatures across H events while the other proxies record maximum cooling. |
format |
Article in Journal/Newspaper |
author |
Peck, V. L. Hall, I. R. Zahn, R. Elderfield, H. |
spellingShingle |
Peck, V. L. Hall, I. R. Zahn, R. Elderfield, H. Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55-8 ka BP |
author_facet |
Peck, V. L. Hall, I. R. Zahn, R. Elderfield, H. |
author_sort |
Peck, V. L. |
title |
Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55-8 ka BP |
title_short |
Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55-8 ka BP |
title_full |
Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55-8 ka BP |
title_fullStr |
Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55-8 ka BP |
title_full_unstemmed |
Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55-8 ka BP |
title_sort |
millennial-scale surface and subsurface paleothermometry from the northeast atlantic, 55-8 ka bp |
publisher |
Amer Geophysical Union |
publishDate |
2008 |
url |
https://archimer.ifremer.fr/doc/00237/34797/33340.pdf https://doi.org/10.1029/2008PA001631 https://archimer.ifremer.fr/doc/00237/34797/ |
genre |
Ice Sheet Neogloboquadrina pachyderma North Atlantic Northeast Atlantic |
genre_facet |
Ice Sheet Neogloboquadrina pachyderma North Atlantic Northeast Atlantic |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2008-09 , Vol. 23 , N. 3 / PA3221 , P. 1-11 |
op_relation |
https://archimer.ifremer.fr/doc/00237/34797/33340.pdf doi:10.1029/2008PA001631 https://archimer.ifremer.fr/doc/00237/34797/ |
op_rights |
Copyright 2008 by the American Geophysical Union info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2008PA001631 |
container_title |
Paleoceanography |
container_volume |
23 |
container_issue |
3 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766031508649279488 |