Journal
SCIENCE
Volume 328, Issue 5985, Pages 1530-1534Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1185435
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Funding
- National Science Foundation (NSF) [OCE9986760, OCE-0351599, OCE0623487, OCE0623310]
- Evolving Earth Foundation
- Japan's Ministry of Education, Culture, Sports, Science and Technology
- European Consortium for Ocean Drilling Research
- People's Republic of China, Ministry of Science and Technology
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Determining the timing and amplitude of tropical sea surface temperature (SST) change is an important part of solving the puzzle of the Plio-Pleistocene ice ages. Alkenone-based tropical SST records from the major ocean basins show coherent glacial-interglacial temperature changes of 1 degrees to 3 degrees C that align with (but slightly lead) global changes in ice volume and deep ocean temperature over the past 3.5 million years. Tropical temperatures became tightly coupled with benthic delta O-18 and orbital forcing after 2.7 million years. We interpret the similarity of tropical SST changes, in dynamically dissimilar regions, to reflect top-down forcing through the atmosphere. The inception of a strong carbon dioxide-greenhouse gas feedback and amplification of orbital forcing at similar to 2.7 million years ago connected the fate of Northern Hemisphere ice sheets with global ocean temperatures since that time.
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