Climate response to orbital forcing across the Oligocene-Miocene boundary
Zachos, J.C., Shackleton, N.J., Revenaugh, J.S., Pälike, H. and Flower, B.P. (2001) Climate response to orbital forcing across the Oligocene-Miocene boundary. Science, 292, (5515), 274-278. (doi:10.1126/science.1058288).
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Description/Abstract
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 Antarctic.
| Item Type: | Article |
|---|---|
| ISSNs: | 0036-8075 (print) |
| Related URLs: | |
| Subjects: | Q Science > QE Geology |
| Divisions: | University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES) |
| Item ID: | 13488 |
| Date Deposited: | 07 Dec 2004 |
| Last Modified: | 25 Apr 2013 09:33 |
| Contributors: | Zachos, J.C. (Author) Shackleton, N.J. (Author) Revenaugh, J.S. (Author) Pälike, H. (Author) Flower, B.P. (Author) |
| Date: | 2001 |
| Status: | Published |
| Contact Email Address: | heiko@noc.soton.ac.uk |
| URI: | http://eprints.soton.ac.uk/id/eprint/13488 |
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