Major Change in Atlantic Deep and Bottom Waters 700,000 yr Ago: Benthonic Foraminiferal Evidence from the South Atlantic
Abstract In the modern South Atlantic the transition between deep water and bottom water is marked by a clear change in the associated benthonic foraminiferal fauna. Uvigerina and Globocassidulina characterize oxygen-poor Circumpolar Deep Water which has long been isolated from the surface. Planulin...
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Cambridge University Press (CUP)
1982
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crcambridgeupr:10.1016/0033-5894(82)90043-6 2024-09-15T17:46:23+00:00 Major Change in Atlantic Deep and Bottom Waters 700,000 yr Ago: Benthonic Foraminiferal Evidence from the South Atlantic Peterson, L. C. Lohmann, G. P. 1982 http://dx.doi.org/10.1016/0033-5894(82)90043-6 http://api.elsevier.com/content/article/PII:0033589482900436?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589482900436?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400021992 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 17, issue 1, page 26-38 ISSN 0033-5894 1096-0287 journal-article 1982 crcambridgeupr https://doi.org/10.1016/0033-5894(82)90043-6 2024-07-17T04:04:04Z Abstract In the modern South Atlantic the transition between deep water and bottom water is marked by a clear change in the associated benthonic foraminiferal fauna. Uvigerina and Globocassidulina characterize oxygen-poor Circumpolar Deep Water which has long been isolated from the surface. Planulina and miliolids are found associated with the more newly formed, oxygen-rich North Atlantic Deep Water. Antarctic Bottom Water is characterized by “Epistominella” umbonifera . Analysis of the benthonic foraminiferal faunas in two sediment cores recovered from the Vema and Hunter Channels in the western South Atlantic shows that the level of the transition between deep and bottom waters shallowed sharply about 700,000 yr ago. This rise indicates a sharp, sustained increase in the volume of bottom water flowing through the South Atlantic after this time. Prior to about 700,000 yr ago, the amount of Antarctic Bottom Water entering the western South Atlantic was greatly reduced and Circumpolar Deep Water apparently accounted for the bulk of northward flow. Production of southward-flowing North Atlantic Deep Water seems not to have been affected. The timing of this change in circulation regime suggests a possible causal link to similar changes in records of terrestrial and sea-surface climate. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic Cambridge University Press Quaternary Research 17 1 26 38 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract In the modern South Atlantic the transition between deep water and bottom water is marked by a clear change in the associated benthonic foraminiferal fauna. Uvigerina and Globocassidulina characterize oxygen-poor Circumpolar Deep Water which has long been isolated from the surface. Planulina and miliolids are found associated with the more newly formed, oxygen-rich North Atlantic Deep Water. Antarctic Bottom Water is characterized by “Epistominella” umbonifera . Analysis of the benthonic foraminiferal faunas in two sediment cores recovered from the Vema and Hunter Channels in the western South Atlantic shows that the level of the transition between deep and bottom waters shallowed sharply about 700,000 yr ago. This rise indicates a sharp, sustained increase in the volume of bottom water flowing through the South Atlantic after this time. Prior to about 700,000 yr ago, the amount of Antarctic Bottom Water entering the western South Atlantic was greatly reduced and Circumpolar Deep Water apparently accounted for the bulk of northward flow. Production of southward-flowing North Atlantic Deep Water seems not to have been affected. The timing of this change in circulation regime suggests a possible causal link to similar changes in records of terrestrial and sea-surface climate. |
format |
Article in Journal/Newspaper |
author |
Peterson, L. C. Lohmann, G. P. |
spellingShingle |
Peterson, L. C. Lohmann, G. P. Major Change in Atlantic Deep and Bottom Waters 700,000 yr Ago: Benthonic Foraminiferal Evidence from the South Atlantic |
author_facet |
Peterson, L. C. Lohmann, G. P. |
author_sort |
Peterson, L. C. |
title |
Major Change in Atlantic Deep and Bottom Waters 700,000 yr Ago: Benthonic Foraminiferal Evidence from the South Atlantic |
title_short |
Major Change in Atlantic Deep and Bottom Waters 700,000 yr Ago: Benthonic Foraminiferal Evidence from the South Atlantic |
title_full |
Major Change in Atlantic Deep and Bottom Waters 700,000 yr Ago: Benthonic Foraminiferal Evidence from the South Atlantic |
title_fullStr |
Major Change in Atlantic Deep and Bottom Waters 700,000 yr Ago: Benthonic Foraminiferal Evidence from the South Atlantic |
title_full_unstemmed |
Major Change in Atlantic Deep and Bottom Waters 700,000 yr Ago: Benthonic Foraminiferal Evidence from the South Atlantic |
title_sort |
major change in atlantic deep and bottom waters 700,000 yr ago: benthonic foraminiferal evidence from the south atlantic |
publisher |
Cambridge University Press (CUP) |
publishDate |
1982 |
url |
http://dx.doi.org/10.1016/0033-5894(82)90043-6 http://api.elsevier.com/content/article/PII:0033589482900436?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589482900436?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400021992 |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
op_source |
Quaternary Research volume 17, issue 1, page 26-38 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/0033-5894(82)90043-6 |
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Quaternary Research |
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17 |
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1 |
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26 |
op_container_end_page |
38 |
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1810494456795758592 |