Deep-sea coral evidence for rapid change in ventilation of the deep North Atlantic 14,400 years ago, Science 280
Coupled radiocarbon and thorium-230 dates from benthic coral species reveal that the ventilation rate of the North Atlantic upper deep water varied greatly during the last deglaciation. Radiocarbon ages in several corals of the same age, 15.41 6 0.17 thousand years, and nearly the same depth, 1800 m...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
1998
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.489.6167 http://www.gps.caltech.edu/~jess/DSCScience1997.pdf |
| Summary: | Coupled radiocarbon and thorium-230 dates from benthic coral species reveal that the ventilation rate of the North Atlantic upper deep water varied greatly during the last deglaciation. Radiocarbon ages in several corals of the same age, 15.41 6 0.17 thousand years, and nearly the same depth, 1800 meters, in the western North Atlantic Ocean increased by as much as 670 years during the 30- to 160-year life spans of the samples. Cadmium/calcium ratios in one coral imply that the nutrient content of these deep waters also increased. Our data show that the deep ocean changed on decadal-centennial time scales during rapid changes in the surface ocean and the atmosphere. Records from Greenland ice cores have revealed that the glacial polar climate shift-ed extremely rapidly several times. From 18,000 to 40,000 years ago (ka), glacial climates were periodically punctuated by rapid returns to milder conditions, called interstadials, that lasted for hundreds of |
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