Deep sea records from the southeast Labrador Sea: Ocean circulation changes and ice-rafting events during the last 160,000 years
[1] Results from two deep sea cores from northeast of Newfoundland at 1251 and 2527 m water depth, respectively, indicate that during the time period from 160,000 to 10,000 years BP, ice rafting events in the Labrador Sea were accompanied by rapid variations in deep and surface water circulation. Tw...
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fttriple:oai:gotriple.eu:10670/1.o4udi0 2023-05-15T16:29:49+02:00 Deep sea records from the southeast Labrador Sea: Ocean circulation changes and ice-rafting events during the last 160,000 years Rasmussen, Tl Oppo, Dw Thomsen, E Lehman, Sj 2003-01-01 https://doi.org/10.1029/2001PA000736 https://archimer.ifremer.fr/doc/00496/60768/65083.pdf https://archimer.ifremer.fr/doc/00496/60768/ en eng Amer Geophysical Union doi:10.1029/2001PA000736 10670/1.o4udi0 https://archimer.ifremer.fr/doc/00496/60768/65083.pdf https://archimer.ifremer.fr/doc/00496/60768/ other Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2003-03 , Vol. 18 , N. 1 , P. 18 (18p.) envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2003 fttriple https://doi.org/10.1029/2001PA000736 2023-01-22T17:20:04Z [1] Results from two deep sea cores from northeast of Newfoundland at 1251 and 2527 m water depth, respectively, indicate that during the time period from 160,000 to 10,000 years BP, ice rafting events in the Labrador Sea were accompanied by rapid variations in deep and surface water circulation. Twelve ice-rafting events occurred, each coinciding with high concentrations of detrital carbonate and oxygen isotopic depletion of both surface and bottom waters. Eleven of these can be correlated with the North Atlantic Heinrich events H1-H11. The remaining very conspicuous ice-rafting event took place early in MIS substage 5e, at a time when the planktic faunal assemblage suggests marked warming of the sea surface. In the shallower core, benthic delta(13)C values rise from a minimum during the deglaciation to peak substage 5e values following the last ice-rafting event, indicating that the ventilation of intermediate depths was renewed after the deglaciation was complete and continued throughout substage 5e. The benthic foraminifera suggest that this well-ventilated water mass was comparable to the modern Labrador Sea Water (LSW). The benthic faunas suggest that a relatively warm intermediate water mass entered the SE Labrador Sea during Heinrich events. Generally low benthic delta(13)C values indicate that this water mass was poorly ventilated and rich in inorganic nutrients. Isotope data and benthic faunal distributions indicate that North Atlantic Deep Water (NADW) formed in the Norwegian-Greenland Sea reached the SE Labrador Sea between the Heinrich events. Text Greenland Greenland Sea Labrador Sea NADW Newfoundland North Atlantic Deep Water North Atlantic Unknown Greenland Newfoundland Paleoceanography 18 1 n/a n/a |
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envir geo Rasmussen, Tl Oppo, Dw Thomsen, E Lehman, Sj Deep sea records from the southeast Labrador Sea: Ocean circulation changes and ice-rafting events during the last 160,000 years |
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description |
[1] Results from two deep sea cores from northeast of Newfoundland at 1251 and 2527 m water depth, respectively, indicate that during the time period from 160,000 to 10,000 years BP, ice rafting events in the Labrador Sea were accompanied by rapid variations in deep and surface water circulation. Twelve ice-rafting events occurred, each coinciding with high concentrations of detrital carbonate and oxygen isotopic depletion of both surface and bottom waters. Eleven of these can be correlated with the North Atlantic Heinrich events H1-H11. The remaining very conspicuous ice-rafting event took place early in MIS substage 5e, at a time when the planktic faunal assemblage suggests marked warming of the sea surface. In the shallower core, benthic delta(13)C values rise from a minimum during the deglaciation to peak substage 5e values following the last ice-rafting event, indicating that the ventilation of intermediate depths was renewed after the deglaciation was complete and continued throughout substage 5e. The benthic foraminifera suggest that this well-ventilated water mass was comparable to the modern Labrador Sea Water (LSW). The benthic faunas suggest that a relatively warm intermediate water mass entered the SE Labrador Sea during Heinrich events. Generally low benthic delta(13)C values indicate that this water mass was poorly ventilated and rich in inorganic nutrients. Isotope data and benthic faunal distributions indicate that North Atlantic Deep Water (NADW) formed in the Norwegian-Greenland Sea reached the SE Labrador Sea between the Heinrich events. |
format |
Text |
author |
Rasmussen, Tl Oppo, Dw Thomsen, E Lehman, Sj |
author_facet |
Rasmussen, Tl Oppo, Dw Thomsen, E Lehman, Sj |
author_sort |
Rasmussen, Tl |
title |
Deep sea records from the southeast Labrador Sea: Ocean circulation changes and ice-rafting events during the last 160,000 years |
title_short |
Deep sea records from the southeast Labrador Sea: Ocean circulation changes and ice-rafting events during the last 160,000 years |
title_full |
Deep sea records from the southeast Labrador Sea: Ocean circulation changes and ice-rafting events during the last 160,000 years |
title_fullStr |
Deep sea records from the southeast Labrador Sea: Ocean circulation changes and ice-rafting events during the last 160,000 years |
title_full_unstemmed |
Deep sea records from the southeast Labrador Sea: Ocean circulation changes and ice-rafting events during the last 160,000 years |
title_sort |
deep sea records from the southeast labrador sea: ocean circulation changes and ice-rafting events during the last 160,000 years |
publisher |
Amer Geophysical Union |
publishDate |
2003 |
url |
https://doi.org/10.1029/2001PA000736 https://archimer.ifremer.fr/doc/00496/60768/65083.pdf https://archimer.ifremer.fr/doc/00496/60768/ |
geographic |
Greenland Newfoundland |
geographic_facet |
Greenland Newfoundland |
genre |
Greenland Greenland Sea Labrador Sea NADW Newfoundland North Atlantic Deep Water North Atlantic |
genre_facet |
Greenland Greenland Sea Labrador Sea NADW Newfoundland North Atlantic Deep Water North Atlantic |
op_source |
Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2003-03 , Vol. 18 , N. 1 , P. 18 (18p.) |
op_relation |
doi:10.1029/2001PA000736 10670/1.o4udi0 https://archimer.ifremer.fr/doc/00496/60768/65083.pdf https://archimer.ifremer.fr/doc/00496/60768/ |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2001PA000736 |
container_title |
Paleoceanography |
container_volume |
18 |
container_issue |
1 |
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n/a |
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1766019531739758592 |