Climate Response to Orbital Forcing across the Oligocene-Miocene Boundary
Spectral analyses of an uninterrupted 5.5-million-year (My)-long chronology of late Oligocene-early Miocene climate and ocean carbon chemistry from two deep-sea cores recovered in the western equatorial Atlantic reveal variance concentrated at all Milankovitch frequencies. Exceptional spectral power...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2001-04, Vol.292 (5515), p.274-278 |
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| creator | Zachos, James C. Shackleton, Nicholas J. Revenaugh, Justin S. Pälike, Heiko Flower, Benjamin P. |
| description | Spectral analyses of an uninterrupted 5.5-million-year (My)-long chronology of late Oligocene-early Miocene climate and ocean carbon chemistry from two deep-sea cores recovered in the western equatorial Atlantic reveal variance concentrated at all Milankovitch frequencies. Exceptional spectral power in climate is recorded at the 406-thousand-year (ky) period eccentricity band over a 3.4-million-year period [20 to 23.4 My ago (Ma)] as well as in the 125- and 95-ky bands over a 1.3-million-year period (21.7 to 23.0 Ma) of suspected low greenhouse gas levels. Moreover, a major transient glaciation at the epoch boundary (~23 Ma), Mi-1, corresponds with a rare orbital congruence involving obliquity and eccentricity. The anomaly, which consists of low-amplitude variance in obliquity (a node) and a minimum in eccentricity, results in an extended period (~200 ky) of low seasonality orbits favorable to ice-sheet expansion on Antarctica. |
| doi_str_mv | 10.1126/science.1058288 |
| format | Article |
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Exceptional spectral power in climate is recorded at the 406-thousand-year (ky) period eccentricity band over a 3.4-million-year period [20 to 23.4 My ago (Ma)] as well as in the 125- and 95-ky bands over a 1.3-million-year period (21.7 to 23.0 Ma) of suspected low greenhouse gas levels. Moreover, a major transient glaciation at the epoch boundary (~23 Ma), Mi-1, corresponds with a rare orbital congruence involving obliquity and eccentricity. The anomaly, which consists of low-amplitude variance in obliquity (a node) and a minimum in eccentricity, results in an extended period (~200 ky) of low seasonality orbits favorable to ice-sheet expansion on Antarctica.</abstract><cop>Washington, DC</cop><pub>American Society for the Advancement of Science</pub><pmid>11303100</pmid><doi>10.1126/science.1058288</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Science (American Association for the Advancement of Science), 2001-04, Vol.292 (5515), p.274-278 |
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| language | eng |
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| source | American Association for the Advancement of Science; Jstor Complete Legacy; MEDLINE |
| subjects | Animals Antarctic Regions Atlantic Ocean Atmosphere Axial tilt Carbon Carbon cycle Carbon dating Carbon Dioxide Carbon Isotopes - analysis Climate Climate change Climatic changes Congenital Impairments Earth sciences Earth, ocean, space Eukaryota Exact sciences and technology Geologic Sediments Geological time Glacial epoch Greenhouse effect Ice Ice ages Isotopes Messenger RNA Miocene Miocene Epoch Numerical eccentricity Oceans Oligocene Oligocene Epoch Orbits Orbits (Astrophysics) Organic Chemistry Oxygen Isotopes - analysis Paleobotany Paleoclimatology Plankton Precession Spectrum Analysis Stratigraphy Time Time series |
| title | Climate Response to Orbital Forcing across the Oligocene-Miocene Boundary |
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