Tropical ocean temperatures over the past 3.5 million years

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doi: 10.1126/science.1185435
Author(s): Herbert, Timothy D.; Peterson, Laura Cleaveland; Lawrence, Kira T.; Liu Zhonghui
Author Affiliation(s): Primary:
Brown University, Department of Geological Sciences, Providence, RI, United States
Other:
Luther College, United States
Lafayette College, United States
University of Hong Kong, China
Volume Title: Science
Source: Science, 328(5985), p.1530-1534. Publisher: American Association for the Advancement of Science, Washington, DC, United States. ISSN: 0036-8075 CODEN: SCIEAS
Note: In English. Supplemental information/data is available in the online version of this article. 49 refs.; illus., incl. 1 table, sketch map
Summary: 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 ∼2.7 million years ago connected the fate of Northern Hemisphere ice sheets with global ocean temperatures since that time.
Year of Publication: 2010
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Arabian Sea; Atlantic Ocean; Carbon dioxide; Cenozoic; Climate forcing; East Pacific; Equatorial Atlantic; Equatorial Pacific; Glacial geology; Glaciation; Ice sheets; Indian Ocean; Isotope ratios; Isotopes; Leg 108; Leg 117; Leg 138; Leg 184; Mid-Atlantic Ridge; Neogene; North Pacific; Northern Hemisphere; Northwest Pacific; O-18/O-16; ODP Site 1146; ODP Site 662; ODP Site 722; ODP Site 846; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoenvironment; Paleotemperature; Pliocene; Quaternary; Sea-surface temperature; South Atlantic; South China Sea; South Pacific; Southeast Pacific; Stable isotopes; Tertiary; Tropical environment; West Pacific
Coordinates: N192724 N192724 E1161622 E1161622
S012325 S012324 W0114421 W0114421
N163718 N163719 E0594746 E0594745
S030549 S030541 W0904904 W0904906
Record ID: 2010079022
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