Deep Circulation of the North Atlantic over the Last 200,000 Years: Geochemical Evidence
Variations in the cadmium/calcium ratio of North Atlantic Deep Water are recorded in the fossil shells of benthic foraminifera. The oceanic distribution of cadmium is similar to that of the nutrients, hence the cadmium/calcium ratio in shells records temporal variations in nutrient distributions. Da...
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American Association for the Advancement of Science (AAAS)
1982
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Online Access: | http://dx.doi.org/10.1126/science.218.4574.784 https://www.science.org/doi/pdf/10.1126/science.218.4574.784 |
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craaas:10.1126/science.218.4574.784 2024-09-30T14:39:03+00:00 Deep Circulation of the North Atlantic over the Last 200,000 Years: Geochemical Evidence Boyle, Edward A. Keigwin, Lloyd D. 1982 http://dx.doi.org/10.1126/science.218.4574.784 https://www.science.org/doi/pdf/10.1126/science.218.4574.784 en eng American Association for the Advancement of Science (AAAS) Science volume 218, issue 4574, page 784-787 ISSN 0036-8075 1095-9203 journal-article 1982 craaas https://doi.org/10.1126/science.218.4574.784 2024-09-12T04:01:39Z Variations in the cadmium/calcium ratio of North Atlantic Deep Water are recorded in the fossil shells of benthic foraminifera. The oceanic distribution of cadmium is similar to that of the nutrients, hence the cadmium/calcium ratio in shells records temporal variations in nutrient distributions. Data from a North Atlantic sediment core show that over the past 200,000 years there has been a continuous supply of nutrient-depleted waters into the deep North Atlantic. The intensity of this source relative to nutrient-enriched southern waters diminished by about a factor of 2 during severe glaciations. This evidence combined with carbon isotope data indicates that the continental carbon inventory may have been less variable than previously suggested. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic AAAS Resource Center (American Association for the Advancement of Science) Science 218 4574 784 787 |
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Open Polar |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
Variations in the cadmium/calcium ratio of North Atlantic Deep Water are recorded in the fossil shells of benthic foraminifera. The oceanic distribution of cadmium is similar to that of the nutrients, hence the cadmium/calcium ratio in shells records temporal variations in nutrient distributions. Data from a North Atlantic sediment core show that over the past 200,000 years there has been a continuous supply of nutrient-depleted waters into the deep North Atlantic. The intensity of this source relative to nutrient-enriched southern waters diminished by about a factor of 2 during severe glaciations. This evidence combined with carbon isotope data indicates that the continental carbon inventory may have been less variable than previously suggested. |
format |
Article in Journal/Newspaper |
author |
Boyle, Edward A. Keigwin, Lloyd D. |
spellingShingle |
Boyle, Edward A. Keigwin, Lloyd D. Deep Circulation of the North Atlantic over the Last 200,000 Years: Geochemical Evidence |
author_facet |
Boyle, Edward A. Keigwin, Lloyd D. |
author_sort |
Boyle, Edward A. |
title |
Deep Circulation of the North Atlantic over the Last 200,000 Years: Geochemical Evidence |
title_short |
Deep Circulation of the North Atlantic over the Last 200,000 Years: Geochemical Evidence |
title_full |
Deep Circulation of the North Atlantic over the Last 200,000 Years: Geochemical Evidence |
title_fullStr |
Deep Circulation of the North Atlantic over the Last 200,000 Years: Geochemical Evidence |
title_full_unstemmed |
Deep Circulation of the North Atlantic over the Last 200,000 Years: Geochemical Evidence |
title_sort |
deep circulation of the north atlantic over the last 200,000 years: geochemical evidence |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
1982 |
url |
http://dx.doi.org/10.1126/science.218.4574.784 https://www.science.org/doi/pdf/10.1126/science.218.4574.784 |
genre |
North Atlantic Deep Water North Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic |
op_source |
Science volume 218, issue 4574, page 784-787 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.218.4574.784 |
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Science |
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218 |
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4574 |
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784 |
op_container_end_page |
787 |
_version_ |
1811641590955900928 |