Tropical Ocean Temperatures Over the Past 3.5 Million Years
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° to 3°C that...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2010-06, Vol.328 (5985), p.1530-1534 |
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| creator | Herbert, Timothy D Peterson, Laura Cleaveland Lawrence, Kira T Liu, Zhonghui |
| description | 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° to 3°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 δ¹⁸O 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 approximately 2.7 million years ago connected the fate of Northern Hemisphere ice sheets with global ocean temperatures since that time. |
| doi_str_mv | 10.1126/science.1185435 |
| format | Article |
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Alkenone-based tropical SST records from the major ocean basins show coherent glacial-interglacial temperature changes of 1° to 3°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 δ¹⁸O 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. 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| subjects | Amplification Carbon Climate change Climate models Coherence Cooling Earth sciences Earth, ocean, space Exact sciences and technology Glacial ages Global climate models Marine Marine geology Ocean basins Ocean temperature Oceans Orbitals Paleoclimate science Paleoclimatology Sea surface temperature Similarity Tropical climates Tropical regions |
| title | Tropical Ocean Temperatures Over the Past 3.5 Million Years |
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