Surface and deep water changes in the subpolar North Atlantic during Termination II and the Last Interglaciation
To reconstruct the history of water mass exchange between the NE Atlantic and the Nordic seas, sediment cores from ∼2 km water depth were studied across Termination II (TII) and through the last interglaciation (MIS5e). During early TII the sudden appearance of the low-latitude planktonic foraminife...
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Online Access: | https://oceanrep.geomar.de/id/eprint/30981/ https://oceanrep.geomar.de/id/eprint/30981/1/Bauch.pdf https://doi.org/10.1029/1998PA000343 |
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ftoceanrep:oai:oceanrep.geomar.de:30981 2023-05-15T17:24:18+02:00 Surface and deep water changes in the subpolar North Atlantic during Termination II and the Last Interglaciation Bauch, Henning A. Erlenkeuser, Helmut Jung, Simon J. A. Thiede, Jörn 2010 text https://oceanrep.geomar.de/id/eprint/30981/ https://oceanrep.geomar.de/id/eprint/30981/1/Bauch.pdf https://doi.org/10.1029/1998PA000343 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/30981/1/Bauch.pdf Bauch, H. A. , Erlenkeuser, H., Jung, S. J. A. and Thiede, J. (2010) Surface and deep water changes in the subpolar North Atlantic during Termination II and the Last Interglaciation. Open Access Paleoceanography, 15 (1). pp. 76-84. DOI 10.1029/1998PA000343 <https://doi.org/10.1029/1998PA000343>. doi:10.1029/1998PA000343 info:eu-repo/semantics/openAccess Article PeerReviewed 2010 ftoceanrep https://doi.org/10.1029/1998PA000343 2023-04-07T15:22:54Z To reconstruct the history of water mass exchange between the NE Atlantic and the Nordic seas, sediment cores from ∼2 km water depth were studied across Termination II (TII) and through the last interglaciation (MIS5e). During early TII the sudden appearance of the low-latitude planktonic foraminifera Beella megastoma is noted in both regions along with a steep decrease in benthic foraminiferal δ18O. Since other proxies indicate that surface waters were cold and stratified because of meltwater, conditions which prevented near-surface thermohaline circulation and vertical convection in the Nordic seas, water mass exchange between the two areas occurred at the subsurface. During later TII, surface conditions changed, and this subsurface circulation style was eventually replaced by vertical convection. In the Nordic seas, B. megastoma vanished from the record together with ice-rafted debris (IRD) at the end of TII, while subpolar foraminiferal abundance rose. Peak interglacial conditions with intensive vertical convection now fully developed, generating a bottom water temperature gradient of ∼4°C between the two areas. However, surface water temperatures deteriorated in the Nordic seas already notably before IRD recurred, and δ18O increased at the end of MIS5e. Article in Journal/Newspaper Nordic Seas North Atlantic Planktonic foraminifera OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Rose Peak ENVELOPE(-58.219,-58.219,-62.047,-62.047) Paleoceanography 15 1 76 84 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
To reconstruct the history of water mass exchange between the NE Atlantic and the Nordic seas, sediment cores from ∼2 km water depth were studied across Termination II (TII) and through the last interglaciation (MIS5e). During early TII the sudden appearance of the low-latitude planktonic foraminifera Beella megastoma is noted in both regions along with a steep decrease in benthic foraminiferal δ18O. Since other proxies indicate that surface waters were cold and stratified because of meltwater, conditions which prevented near-surface thermohaline circulation and vertical convection in the Nordic seas, water mass exchange between the two areas occurred at the subsurface. During later TII, surface conditions changed, and this subsurface circulation style was eventually replaced by vertical convection. In the Nordic seas, B. megastoma vanished from the record together with ice-rafted debris (IRD) at the end of TII, while subpolar foraminiferal abundance rose. Peak interglacial conditions with intensive vertical convection now fully developed, generating a bottom water temperature gradient of ∼4°C between the two areas. However, surface water temperatures deteriorated in the Nordic seas already notably before IRD recurred, and δ18O increased at the end of MIS5e. |
format |
Article in Journal/Newspaper |
author |
Bauch, Henning A. Erlenkeuser, Helmut Jung, Simon J. A. Thiede, Jörn |
spellingShingle |
Bauch, Henning A. Erlenkeuser, Helmut Jung, Simon J. A. Thiede, Jörn Surface and deep water changes in the subpolar North Atlantic during Termination II and the Last Interglaciation |
author_facet |
Bauch, Henning A. Erlenkeuser, Helmut Jung, Simon J. A. Thiede, Jörn |
author_sort |
Bauch, Henning A. |
title |
Surface and deep water changes in the subpolar North Atlantic during Termination II and the Last Interglaciation |
title_short |
Surface and deep water changes in the subpolar North Atlantic during Termination II and the Last Interglaciation |
title_full |
Surface and deep water changes in the subpolar North Atlantic during Termination II and the Last Interglaciation |
title_fullStr |
Surface and deep water changes in the subpolar North Atlantic during Termination II and the Last Interglaciation |
title_full_unstemmed |
Surface and deep water changes in the subpolar North Atlantic during Termination II and the Last Interglaciation |
title_sort |
surface and deep water changes in the subpolar north atlantic during termination ii and the last interglaciation |
publisher |
AGU (American Geophysical Union) |
publishDate |
2010 |
url |
https://oceanrep.geomar.de/id/eprint/30981/ https://oceanrep.geomar.de/id/eprint/30981/1/Bauch.pdf https://doi.org/10.1029/1998PA000343 |
long_lat |
ENVELOPE(-58.219,-58.219,-62.047,-62.047) |
geographic |
Rose Peak |
geographic_facet |
Rose Peak |
genre |
Nordic Seas North Atlantic Planktonic foraminifera |
genre_facet |
Nordic Seas North Atlantic Planktonic foraminifera |
op_relation |
https://oceanrep.geomar.de/id/eprint/30981/1/Bauch.pdf Bauch, H. A. , Erlenkeuser, H., Jung, S. J. A. and Thiede, J. (2010) Surface and deep water changes in the subpolar North Atlantic during Termination II and the Last Interglaciation. Open Access Paleoceanography, 15 (1). pp. 76-84. DOI 10.1029/1998PA000343 <https://doi.org/10.1029/1998PA000343>. doi:10.1029/1998PA000343 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/1998PA000343 |
container_title |
Paleoceanography |
container_volume |
15 |
container_issue |
1 |
container_start_page |
76 |
op_container_end_page |
84 |
_version_ |
1766115249848582144 |