High-resolution benthic foraminiferal records of the last glacial termination in the northern North Atlantic

Large oceanic changes occurred during the last transition from glacial to interglacial conditions (Termination I), which significantly affected pelagic and benthic environments. This study presents results of a quantitative investigation of benthic foraminifera at four sites distributed along a nort...

Full description

Bibliographic Details
Main Author: Nees, Stefan
Other Authors: Hass, H. Christian, Kaminski, Michael A.
Format: Book Part
Language:English
Published: Grzybowski Foundation 1997
Subjects:
Online Access:https://oceanrep.geomar.de/id/eprint/31039/
https://oceanrep.geomar.de/id/eprint/31039/1/Nees%201997.pdf
id ftoceanrep:oai:oceanrep.geomar.de:31039
record_format openpolar
spelling ftoceanrep:oai:oceanrep.geomar.de:31039 2023-05-15T16:18:08+02:00 High-resolution benthic foraminiferal records of the last glacial termination in the northern North Atlantic Nees, Stefan Hass, H. Christian Kaminski, Michael A. 1997 text https://oceanrep.geomar.de/id/eprint/31039/ https://oceanrep.geomar.de/id/eprint/31039/1/Nees%201997.pdf en eng Grzybowski Foundation https://oceanrep.geomar.de/id/eprint/31039/1/Nees%201997.pdf Nees, S. (1997) High-resolution benthic foraminiferal records of the last glacial termination in the northern North Atlantic. In: Contributions to the micropaleontology and paleoceanography of the northern North Atlantic (collected results from the GEOMAR Bungalow Working Group). , ed. by Hass, H. C. and Kaminski, M. A. Grzybowski Foundation, Krakow, pp. 167-197. Book chapter NonPeerReviewed 1997 ftoceanrep 2023-04-07T15:22:54Z Large oceanic changes occurred during the last transition from glacial to interglacial conditions (Termination I), which significantly affected pelagic and benthic environments. This study presents results of a quantitative investigation of benthic foraminifera at four sites distributed along a north-south transect across the northern North Atlantic with a high temporal resolution (k 200 years). Benthic foraminifera are examined in samples (1-2 cm sampling intervals) from four long sediment cores located in the southern Fram Strait, the Greenland-Iceland-Norwegian Sea (GIN Sea), and the Rockall Plateau. The most prominent species of benthic foraminifera include Oridorsalis nnlbolzatlls, Cibicidoides wl~ellerstoufi,C assidulina spp. group, P!jrgo rotalaria, Globocassidrrliiza sllbg-lobosa and tubes of agglutinated taxa. In each core, the climatic amelioration at Termination I is recorded to have occurred in two steps. A first INDAR maximum (INDividuals Accumulation Rate = ind/cm2 ky; GIN Sea: average 3,000-6,000 ind/cm2 ky, Rockall Plateau: average 150 ind/cm2 ky) is followed by a period of lower values. A second maximum reveals slightly lower values than the older maximum. Interglacial INDAR values average 700 ind/cm2 ky for the GIN Sea and 200 ind/cm2 ky on the Rockall Plateau. This is roughly twice that of typical glacial values. Meltwater events, identified by stable isotope data and sea-surface temperature reconstructions based on planktic foraminiferal transfer functions, are marked by an increase in endobenthic and opportunistic species. A decrease of reconstructed sea-surface temperatures appears synchronous with the relative INDAR minimum that occurs between the two INDAR maxima. The results indicate a close coupling of sea-surface processes to the benthic realm ("pelagic-benthic coupling") with a longitudinally variable strength. The climate signal at the Rockall Plateau revealed by the fossil benthic foraminifera shows a lower amplitude than that of the GIN Sea. The second, younger INDAR maximum is ... Book Part Fram Strait Greenland Iceland North Atlantic Norwegian Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Greenland Norwegian Sea Rockall Plateau ENVELOPE(-18.833,-18.833,56.333,56.333)
institution Open Polar
collection OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
op_collection_id ftoceanrep
language English
description Large oceanic changes occurred during the last transition from glacial to interglacial conditions (Termination I), which significantly affected pelagic and benthic environments. This study presents results of a quantitative investigation of benthic foraminifera at four sites distributed along a north-south transect across the northern North Atlantic with a high temporal resolution (k 200 years). Benthic foraminifera are examined in samples (1-2 cm sampling intervals) from four long sediment cores located in the southern Fram Strait, the Greenland-Iceland-Norwegian Sea (GIN Sea), and the Rockall Plateau. The most prominent species of benthic foraminifera include Oridorsalis nnlbolzatlls, Cibicidoides wl~ellerstoufi,C assidulina spp. group, P!jrgo rotalaria, Globocassidrrliiza sllbg-lobosa and tubes of agglutinated taxa. In each core, the climatic amelioration at Termination I is recorded to have occurred in two steps. A first INDAR maximum (INDividuals Accumulation Rate = ind/cm2 ky; GIN Sea: average 3,000-6,000 ind/cm2 ky, Rockall Plateau: average 150 ind/cm2 ky) is followed by a period of lower values. A second maximum reveals slightly lower values than the older maximum. Interglacial INDAR values average 700 ind/cm2 ky for the GIN Sea and 200 ind/cm2 ky on the Rockall Plateau. This is roughly twice that of typical glacial values. Meltwater events, identified by stable isotope data and sea-surface temperature reconstructions based on planktic foraminiferal transfer functions, are marked by an increase in endobenthic and opportunistic species. A decrease of reconstructed sea-surface temperatures appears synchronous with the relative INDAR minimum that occurs between the two INDAR maxima. The results indicate a close coupling of sea-surface processes to the benthic realm ("pelagic-benthic coupling") with a longitudinally variable strength. The climate signal at the Rockall Plateau revealed by the fossil benthic foraminifera shows a lower amplitude than that of the GIN Sea. The second, younger INDAR maximum is ...
author2 Hass, H. Christian
Kaminski, Michael A.
format Book Part
author Nees, Stefan
spellingShingle Nees, Stefan
High-resolution benthic foraminiferal records of the last glacial termination in the northern North Atlantic
author_facet Nees, Stefan
author_sort Nees, Stefan
title High-resolution benthic foraminiferal records of the last glacial termination in the northern North Atlantic
title_short High-resolution benthic foraminiferal records of the last glacial termination in the northern North Atlantic
title_full High-resolution benthic foraminiferal records of the last glacial termination in the northern North Atlantic
title_fullStr High-resolution benthic foraminiferal records of the last glacial termination in the northern North Atlantic
title_full_unstemmed High-resolution benthic foraminiferal records of the last glacial termination in the northern North Atlantic
title_sort high-resolution benthic foraminiferal records of the last glacial termination in the northern north atlantic
publisher Grzybowski Foundation
publishDate 1997
url https://oceanrep.geomar.de/id/eprint/31039/
https://oceanrep.geomar.de/id/eprint/31039/1/Nees%201997.pdf
long_lat ENVELOPE(-18.833,-18.833,56.333,56.333)
geographic Greenland
Norwegian Sea
Rockall Plateau
geographic_facet Greenland
Norwegian Sea
Rockall Plateau
genre Fram Strait
Greenland
Iceland
North Atlantic
Norwegian Sea
genre_facet Fram Strait
Greenland
Iceland
North Atlantic
Norwegian Sea
op_relation https://oceanrep.geomar.de/id/eprint/31039/1/Nees%201997.pdf
Nees, S. (1997) High-resolution benthic foraminiferal records of the last glacial termination in the northern North Atlantic. In: Contributions to the micropaleontology and paleoceanography of the northern North Atlantic (collected results from the GEOMAR Bungalow Working Group). , ed. by Hass, H. C. and Kaminski, M. A. Grzybowski Foundation, Krakow, pp. 167-197.
_version_ 1766004266335469568