Deep-Sea Temperature and Ice Volume Changes Across the Pliocene-Pleistocene Climate Transitions
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Material Information

Title:
Deep-Sea Temperature and Ice Volume Changes Across the Pliocene-Pleistocene Climate Transitions
Creator:
Sindia Sosdian
Yair Rosenthal
Affiliation:
Australian National University -- Research School of Earth Sciences
Rutgers University -- Department of Earth and Planetary Sciences -- Institute of Marine and Coastal Science
Publisher:
American Association for the Advancement of Science
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
climate change
deep sea temperature
ice sheets

Notes

Abstract:
Earth has undergone profound changes since the late Pliocene, which led to the development [~2.7 million years ago (Ma)] and intensification (~0.9 Ma) of large-scale Northern Hemisphere ice sheets, recorded as transitions in the benthic foraminiferal oxygen isotope (d18Ob) record. Here we present an orbitally resolved record of deep ocean temperature derived from benthic foraminiferal magnesium/calcium ratios from the North Atlantic, which shows that temperature variations are a substantial portion of the global d18Ob signal. The record shows two distinct cooling events associated with the late Pliocene (LPT, 2.5 to 3 Ma) and mid-Pleistocene (MPT, 1.2 to 0.85 Ma) climate transitions. Whereas the LPT increase in ice volume is attributed directly to global cooling, the shift to 100,000-year cycles at the MPT is more likely to be a response to an additional change in ice-sheet dynamics. ( English )

Record Information

Source Institution:
Florida International University
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Aggregations:
Sea Level Rise