The Mode and Mechanism of the Last Deglaciation: Oceanic Evidence
Abstract Changes in ocean temperature, carbonate productivity, and ice-rafted detritus in the North Atlantic suggest that half of the Northern Hemisphere ice volume at the last glacial maximum had disappeared by 13,000 yr B.P., despite the still-extensive limits of the ice sheets. This early thinnin...
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Cambridge University Press (CUP)
1981
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crcambridgeupr:10.1016/0033-5894(81)90040-5 2024-09-09T19:57:11+00:00 The Mode and Mechanism of the Last Deglaciation: Oceanic Evidence Ruddiman, W. F. McIntyre, A. 1981 http://dx.doi.org/10.1016/0033-5894(81)90040-5 http://api.elsevier.com/content/article/PII:0033589481900405?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589481900405?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400021700 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 16, issue 2, page 125-134 ISSN 0033-5894 1096-0287 journal-article 1981 crcambridgeupr https://doi.org/10.1016/0033-5894(81)90040-5 2024-07-31T04:03:59Z Abstract Changes in ocean temperature, carbonate productivity, and ice-rafted detritus in the North Atlantic suggest that half of the Northern Hemisphere ice volume at the last glacial maximum had disappeared by 13,000 yr B.P., despite the still-extensive limits of the ice sheets. This early thinning of the ice sheets occurred during a time when summer insolation values were slowly rising but when pollen evidence south of the ice margins indicates cold, dry air masses. We infer that this rapid early ice disintegration (16,000–13,000 yr B.P.) was caused by oceanic mechanisms: (1) rising sea level, causing increased calving along ice margins; (2) the chilling of the sea-surface by icebergs and meltwater, reducing moisture extraction by the atmosphere and transport to the ice sheets; and (3) winter freezing of the low-salinity meltwater layer, suppressing local moisture extraction and the regional influx of moisture-bearing storms from lower latitudes in winter and hence starving the ice sheets. These oceanic feedback mechanisms were strongest from 16,000 to 13,000 yr B.P., and weaker but still active from that date until the end of deglaciation at 6000 yr B.P. Article in Journal/Newspaper North Atlantic Cambridge University Press Quaternary Research 16 2 125 134 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Changes in ocean temperature, carbonate productivity, and ice-rafted detritus in the North Atlantic suggest that half of the Northern Hemisphere ice volume at the last glacial maximum had disappeared by 13,000 yr B.P., despite the still-extensive limits of the ice sheets. This early thinning of the ice sheets occurred during a time when summer insolation values were slowly rising but when pollen evidence south of the ice margins indicates cold, dry air masses. We infer that this rapid early ice disintegration (16,000–13,000 yr B.P.) was caused by oceanic mechanisms: (1) rising sea level, causing increased calving along ice margins; (2) the chilling of the sea-surface by icebergs and meltwater, reducing moisture extraction by the atmosphere and transport to the ice sheets; and (3) winter freezing of the low-salinity meltwater layer, suppressing local moisture extraction and the regional influx of moisture-bearing storms from lower latitudes in winter and hence starving the ice sheets. These oceanic feedback mechanisms were strongest from 16,000 to 13,000 yr B.P., and weaker but still active from that date until the end of deglaciation at 6000 yr B.P. |
format |
Article in Journal/Newspaper |
author |
Ruddiman, W. F. McIntyre, A. |
spellingShingle |
Ruddiman, W. F. McIntyre, A. The Mode and Mechanism of the Last Deglaciation: Oceanic Evidence |
author_facet |
Ruddiman, W. F. McIntyre, A. |
author_sort |
Ruddiman, W. F. |
title |
The Mode and Mechanism of the Last Deglaciation: Oceanic Evidence |
title_short |
The Mode and Mechanism of the Last Deglaciation: Oceanic Evidence |
title_full |
The Mode and Mechanism of the Last Deglaciation: Oceanic Evidence |
title_fullStr |
The Mode and Mechanism of the Last Deglaciation: Oceanic Evidence |
title_full_unstemmed |
The Mode and Mechanism of the Last Deglaciation: Oceanic Evidence |
title_sort |
mode and mechanism of the last deglaciation: oceanic evidence |
publisher |
Cambridge University Press (CUP) |
publishDate |
1981 |
url |
http://dx.doi.org/10.1016/0033-5894(81)90040-5 http://api.elsevier.com/content/article/PII:0033589481900405?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589481900405?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400021700 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Quaternary Research volume 16, issue 2, page 125-134 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/0033-5894(81)90040-5 |
container_title |
Quaternary Research |
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16 |
container_issue |
2 |
container_start_page |
125 |
op_container_end_page |
134 |
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1809928090376208384 |