The 100,000-Year Ice-Age Cycle Identified and Found to Lag Temperature, Carbon Dioxide, and Orbital Eccentricity
The deep-sea sediment oxygen isotopic composition (δ 18 O) record is dominated by a 100,000-year cyclicity that is universally interpreted as the main ice-age rhythm. Here, the ice volume component of this δ 18 O signal was extracted by using the record of δ 18 O in atmospheric oxygen trapped in Ant...
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craaas:10.1126/science.289.5486.1897 2024-06-23T07:47:57+00:00 The 100,000-Year Ice-Age Cycle Identified and Found to Lag Temperature, Carbon Dioxide, and Orbital Eccentricity Shackleton, Nicholas J. 2000 http://dx.doi.org/10.1126/science.289.5486.1897 https://www.science.org/doi/pdf/10.1126/science.289.5486.1897 en eng American Association for the Advancement of Science (AAAS) Science volume 289, issue 5486, page 1897-1902 ISSN 0036-8075 1095-9203 journal-article 2000 craaas https://doi.org/10.1126/science.289.5486.1897 2024-06-13T04:01:44Z The deep-sea sediment oxygen isotopic composition (δ 18 O) record is dominated by a 100,000-year cyclicity that is universally interpreted as the main ice-age rhythm. Here, the ice volume component of this δ 18 O signal was extracted by using the record of δ 18 O in atmospheric oxygen trapped in Antarctic ice at Vostok, precisely orbitally tuned. The benthic marine δ 18 O record is heavily contaminated by the effect of deep-water temperature variability, but by using the Vostok record, the δ 18 O signals of ice volume, deep-water temperature, and additional processes affecting air δ 18 O (that is, a varying Dole effect) were separated. At the 100,000-year period, atmospheric carbon dioxide, Vostok air temperature, and deep-water temperature are in phase with orbital eccentricity, whereas ice volume lags these three variables. Hence, the 100,000-year cycle does not arise from ice sheet dynamics; instead, it is probably the response of the global carbon cycle that generates the eccentricity signal by causing changes in atmospheric carbon dioxide concentration. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet AAAS Resource Center (American Association for the Advancement of Science) Antarctic Science 289 5486 1897 1902 |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
The deep-sea sediment oxygen isotopic composition (δ 18 O) record is dominated by a 100,000-year cyclicity that is universally interpreted as the main ice-age rhythm. Here, the ice volume component of this δ 18 O signal was extracted by using the record of δ 18 O in atmospheric oxygen trapped in Antarctic ice at Vostok, precisely orbitally tuned. The benthic marine δ 18 O record is heavily contaminated by the effect of deep-water temperature variability, but by using the Vostok record, the δ 18 O signals of ice volume, deep-water temperature, and additional processes affecting air δ 18 O (that is, a varying Dole effect) were separated. At the 100,000-year period, atmospheric carbon dioxide, Vostok air temperature, and deep-water temperature are in phase with orbital eccentricity, whereas ice volume lags these three variables. Hence, the 100,000-year cycle does not arise from ice sheet dynamics; instead, it is probably the response of the global carbon cycle that generates the eccentricity signal by causing changes in atmospheric carbon dioxide concentration. |
format |
Article in Journal/Newspaper |
author |
Shackleton, Nicholas J. |
spellingShingle |
Shackleton, Nicholas J. The 100,000-Year Ice-Age Cycle Identified and Found to Lag Temperature, Carbon Dioxide, and Orbital Eccentricity |
author_facet |
Shackleton, Nicholas J. |
author_sort |
Shackleton, Nicholas J. |
title |
The 100,000-Year Ice-Age Cycle Identified and Found to Lag Temperature, Carbon Dioxide, and Orbital Eccentricity |
title_short |
The 100,000-Year Ice-Age Cycle Identified and Found to Lag Temperature, Carbon Dioxide, and Orbital Eccentricity |
title_full |
The 100,000-Year Ice-Age Cycle Identified and Found to Lag Temperature, Carbon Dioxide, and Orbital Eccentricity |
title_fullStr |
The 100,000-Year Ice-Age Cycle Identified and Found to Lag Temperature, Carbon Dioxide, and Orbital Eccentricity |
title_full_unstemmed |
The 100,000-Year Ice-Age Cycle Identified and Found to Lag Temperature, Carbon Dioxide, and Orbital Eccentricity |
title_sort |
100,000-year ice-age cycle identified and found to lag temperature, carbon dioxide, and orbital eccentricity |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2000 |
url |
http://dx.doi.org/10.1126/science.289.5486.1897 https://www.science.org/doi/pdf/10.1126/science.289.5486.1897 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Science volume 289, issue 5486, page 1897-1902 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.289.5486.1897 |
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Science |
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289 |
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5486 |
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1897 |
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