Identification of Density-Stratified Waters in the Late-Pleistocene North Atlantic: A faunal Derivation
An expanded study of the radiolarian Cycladophora davisiana in late-Pleistocene North Atlantic marine sediments shows that over the last several hundred thousand years this species exhibits large variations in relative abundance. The C. davisiana curves in the North Atlantic cores are quite similar,...
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Cambridge University Press (CUP)
1983
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crcambridgeupr:10.1016/0033-5894(83)90019-4 2024-09-09T19:54:30+00:00 Identification of Density-Stratified Waters in the Late-Pleistocene North Atlantic: A faunal Derivation Morley, Joseph J. 1983 http://dx.doi.org/10.1016/0033-5894(83)90019-4 http://api.elsevier.com/content/article/PII:0033589483900194?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589483900194?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400033858 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 20, issue 3, page 374-386 ISSN 0033-5894 1096-0287 journal-article 1983 crcambridgeupr https://doi.org/10.1016/0033-5894(83)90019-4 2024-07-24T04:03:23Z An expanded study of the radiolarian Cycladophora davisiana in late-Pleistocene North Atlantic marine sediments shows that over the last several hundred thousand years this species exhibits large variations in relative abundance. The C. davisiana curves in the North Atlantic cores are quite similar, with easily recognizable features common to all records. Minor deviations from the general pattern of this species' abundance apparently reflect the response of C. davisiana to specific oceanographic conditions characteristic of a particular area within the North Atlantic. C. davisiana occurs today in high abundance (>20%) only in the Sea of Okhotsk. Extensive winter and early spring sea-ice cover coupled with low surface-water salinities during summer and fall is responsible for maintaining near-freezing subsurface temperatures in this northwest Pacific marginal sea as well as relatively stable temperatures and salinities at depths below a shallow subsurface temperature minimum. During periods in the late Pleistocene, high C. davisiana abundances (>20%) in the North Atlantic were probably associated with oceanographic properties similar to those that exist in the Sea of Okhotsk today. Because of the relationship between relatively stable subsurface temperatures and salinities and high abundance levels of C. davisiana , analysis of this species' abundance pattern at several locations throughout the high-latitude North Atlantic should assist in identifying source areas of deep-water formation and determining the duration of deep convective processes at these sites. Article in Journal/Newspaper North Atlantic Sea ice Cambridge University Press Okhotsk Pacific Quaternary Research 20 3 374 386 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
An expanded study of the radiolarian Cycladophora davisiana in late-Pleistocene North Atlantic marine sediments shows that over the last several hundred thousand years this species exhibits large variations in relative abundance. The C. davisiana curves in the North Atlantic cores are quite similar, with easily recognizable features common to all records. Minor deviations from the general pattern of this species' abundance apparently reflect the response of C. davisiana to specific oceanographic conditions characteristic of a particular area within the North Atlantic. C. davisiana occurs today in high abundance (>20%) only in the Sea of Okhotsk. Extensive winter and early spring sea-ice cover coupled with low surface-water salinities during summer and fall is responsible for maintaining near-freezing subsurface temperatures in this northwest Pacific marginal sea as well as relatively stable temperatures and salinities at depths below a shallow subsurface temperature minimum. During periods in the late Pleistocene, high C. davisiana abundances (>20%) in the North Atlantic were probably associated with oceanographic properties similar to those that exist in the Sea of Okhotsk today. Because of the relationship between relatively stable subsurface temperatures and salinities and high abundance levels of C. davisiana , analysis of this species' abundance pattern at several locations throughout the high-latitude North Atlantic should assist in identifying source areas of deep-water formation and determining the duration of deep convective processes at these sites. |
format |
Article in Journal/Newspaper |
author |
Morley, Joseph J. |
spellingShingle |
Morley, Joseph J. Identification of Density-Stratified Waters in the Late-Pleistocene North Atlantic: A faunal Derivation |
author_facet |
Morley, Joseph J. |
author_sort |
Morley, Joseph J. |
title |
Identification of Density-Stratified Waters in the Late-Pleistocene North Atlantic: A faunal Derivation |
title_short |
Identification of Density-Stratified Waters in the Late-Pleistocene North Atlantic: A faunal Derivation |
title_full |
Identification of Density-Stratified Waters in the Late-Pleistocene North Atlantic: A faunal Derivation |
title_fullStr |
Identification of Density-Stratified Waters in the Late-Pleistocene North Atlantic: A faunal Derivation |
title_full_unstemmed |
Identification of Density-Stratified Waters in the Late-Pleistocene North Atlantic: A faunal Derivation |
title_sort |
identification of density-stratified waters in the late-pleistocene north atlantic: a faunal derivation |
publisher |
Cambridge University Press (CUP) |
publishDate |
1983 |
url |
http://dx.doi.org/10.1016/0033-5894(83)90019-4 http://api.elsevier.com/content/article/PII:0033589483900194?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589483900194?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400033858 |
geographic |
Okhotsk Pacific |
geographic_facet |
Okhotsk Pacific |
genre |
North Atlantic Sea ice |
genre_facet |
North Atlantic Sea ice |
op_source |
Quaternary Research volume 20, issue 3, page 374-386 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/0033-5894(83)90019-4 |
container_title |
Quaternary Research |
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20 |
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3 |
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374 |
op_container_end_page |
386 |
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1809923875893411840 |