Climate Response to Orbital Forcing Across the Oligocene-Miocene Boundary

Details Climate Response to Orbital Forcing Across the Oligocene-Miocene Boundary Climate Response to Orbital Forcing Across the Oligocene-Miocene Boundary

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sci...292..274z&link_type=abstract

Science, Volume 292, Issue 5515, pp. 274-278 (2001).

Physics

54

Scientific paper

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.

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