The Oligocene–Miocene Boundary – Antarctic Climate Response to Orbital Forcing
Recent high-resolution Oligocene–Miocene oxygen isotopic records revealed a AU:2 relatively transient, ca. 2 myr period, 1 m amplitude cyclicity in isotopic values (Oi and Mi events, respectively). Intriguingly, it has been suggested that these isotopic excursions in oceanic d 18 O were linked to ep...
| Main Authors: | , , , , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.211.1827 http://www.geo.umass.edu/climate/papers2/Wilson_et_al.2008.pdf |
| Summary: | Recent high-resolution Oligocene–Miocene oxygen isotopic records revealed a AU:2 relatively transient, ca. 2 myr period, 1 m amplitude cyclicity in isotopic values (Oi and Mi events, respectively). Intriguingly, it has been suggested that these isotopic excursions in oceanic d 18 O were linked to ephemeral growth and decay in Antarctic ice sheets. A great deal of effort in the palaeoceanography community has been focused on developing techniques and gathering further records to determine if the Antarctic ice has behaved in such a transient manner in the past and indeed what factors might have led to the rapid growth and decay of ice sheets. Deciphering between temperature and ice-volume influences in the deep-sea isotopic record has proven somewhat difficult. Approaches have included the sampling of sediment from beneath different water masses, development of an independent palaeothermometer using magnesium/calcium ratios and improving the resolution and accuracy of coastal sea-level records. Despite these advances it Corresponding author. |
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