A Mid-Brunhes Climatic Event: Long-Term Changes in Global Atmosphere and Ocean Circulation
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- J. H. F. Jansen
- Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands.
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- A. Kuijpers
- Geological Survey of The Netherlands, P.O. Box 157, 2000 AD Haarlem, The Netherlands.
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- S. R. Troelstra
- Institute of Earth Sciences of the Free University of Amsterdam, P.O. Box 7161, 1007 MC Amsterdam, The Netherlands.
書誌事項
- 公開日
- 1986-05-02
- DOI
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- 10.1126/science.232.4750.619
- 公開者
- American Association for the Advancement of Science (AAAS)
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説明
<jats:p> A long-term climatic change 4.0 × 10 <jats:sup>5</jats:sup> to 3.0 × 10 <jats:sup>5</jats:sup> years ago is recorded in deep-sea sediments of the Angola and Canary basins in the eastern Atlantic Ocean. In the Angola Basin (Southern Hemisphere) the climatic signal shows a transition to more humid ("interglacial") conditions in equatorial Africa, and in the Canary Basin (Northern Hemisphere) to more "glacial" oceanic conditions. This trend is confirmed by comparison with all well-documented marine and continental records from various latitudes available; in the Northern Hemisphere, in the Atlantic north of 20°N, climate merged into more "glacial" conditions and in equatorial regions and in the Southern Hemisphere to more "interglacial" conditions. The data point to a more northern position of early Brunhes oceanic fronts and to an intensified atmosphere and ocean surface circulation in the Southern Hemisphere during that time, probably accompanied by a more zonal circulation in the Northern Hemisphere. The mid-Brunhes climatic change may have been forced by the orbital eccentricity cycle of 4.13 × 10 <jats:sup>5</jats:sup> years. </jats:p>
収録刊行物
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- Science
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Science 232 (4750), 619-622, 1986-05-02
American Association for the Advancement of Science (AAAS)
