Antiphasing between Rainfall in Africa's Rift Valley and North America's Great Basin
The beginning of the Bølling-Allerød warm period was marked in Greenland ice by an abrupt rise in δ 18 O, an abrupt drop in dust rain, and an abrupt increase in atmospheric methane content. The surface waters in the Norwegian Sea underwent a simultaneous abrupt warming. At about this time, a major c...
| Published in: | Quaternary Research |
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| Main Authors: | , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Cambridge University Press (CUP)
1998
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1006/qres.1998.1973 http://api.elsevier.com/content/article/PII:S0033589498919731?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589498919731?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400025254 |
| Summary: | The beginning of the Bølling-Allerød warm period was marked in Greenland ice by an abrupt rise in δ 18 O, an abrupt drop in dust rain, and an abrupt increase in atmospheric methane content. The surface waters in the Norwegian Sea underwent a simultaneous abrupt warming. At about this time, a major change in the pattern of global rainfall occurred. Lake Victoria (latitude 0°), which prior to this time was dry, was rejuvenated. The Red Sea, which prior to this time was hypersaline, freshened. Lake Lahontan, which prior to this time had achieved its largest size, desiccated. Whereas the chronologic support for the abruptness of the hydrologic changes is firm only for the Red Sea, in keeping with evidence obtained well away from the northern Atlantic in the Santa Barbara Basin and the Cariaco Trench, the onset and end of the millennial-duration climate events were globally abrupt. If so, the proposed linkage between the size of African closed basin lakes and insolation cycles must be reexamined. |
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