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| James Zachos | |
|---|---|
| Name | James Zachos |
| Birth date | 1958 |
| Nationality | American |
| Fields | Paleoclimatology, Geology, Oceanography |
| Workplaces | University of California, Santa Cruz; University of California, Santa Barbara; University of Rhode Island |
| Alma mater | State University of New York at Stony Brook; Columbia University |
James Zachos
James Zachos is an American paleoclimatologist and geologist known for contributions to understanding Paleogene climate change, oceanography, and carbon cycle dynamics. He has worked on deep-sea sediment cores, isotope geochemistry, and climate events such as the Paleocene–Eocene Thermal Maximum, collaborating with scientists across institutions including the University of California, Santa Cruz, University of California, Santa Barbara, Columbia University, and Lamont–Doherty Earth Observatory. His research integrates data from programs and platforms like the Ocean Drilling Program, the Integrated Ocean Drilling Program, and the International Ocean Discovery Program.
Born in 1958, Zachos completed undergraduate and graduate studies at institutions including the State University of New York at Stony Brook and Columbia University. During his graduate training he worked with specialists connected to facilities such as the Lamont–Doherty Earth Observatory and engaged with projects affiliated with the National Science Foundation, the Smithsonian Institution, and the American Geophysical Union. His early work intersected with research networks centered on the Atlantic Ocean, the Pacific Ocean, and the Southern Ocean.
Zachos has held faculty positions at the University of California, Santa Cruz and previous appointments at the University of California, Santa Barbara and the University of Rhode Island. He has participated in collaborative programs with the Scripps Institution of Oceanography, the Woods Hole Oceanographic Institution, and the British Geological Survey. He has served on panels for the National Academies of Sciences, Engineering, and Medicine and committees associated with the National Science Foundation and the International Marine Organization-linked scientific initiatives. His laboratory has maintained links with analytical facilities at Columbia University, University of California, Santa Cruz, and international repositories such as the Natural History Museum, London.
Zachos is widely cited for work on the Paleocene–Eocene Thermal Maximum, the Eocene Thermal Maximum 2, and long-term Cenozoic climate trends including the transition from greenhouse to icehouse conditions. He advanced the use of benthic and planktonic foraminiferal stable isotope records and linked isotopic excursions to carbon cycle perturbations documented at sites from the North Atlantic to the South Atlantic and the Equatorial Pacific. His studies synthesized data from the Ocean Drilling Program, Deep Sea Drilling Project, and Integrated Ocean Drilling Program boreholes, clarifying rates of warming, ocean acidification, and biotic response during events like the Paleocene–Eocene Thermal Maximum and the Eocene. He collaborated with researchers at Lamont–Doherty Earth Observatory, Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, and University of Oxford to quantify carbon release, using proxies including oxygen isotopes, carbon isotopes, and trace-element ratios measured with instruments at facilities like the Geological Survey of Canada and the US Geological Survey laboratories.
His work connected paleoclimate variations to tectonic and orbital forcings involving the Indian Plate collision history, the opening of the Southern Ocean gateways such as the Tasman Gateway and the Drake Passage, and paleogeographic reconstructions used by teams from the Paleomap Project and the International Commission on Stratigraphy. He co-authored influential syntheses with scholars affiliated with the Royal Society, European Geosciences Union, and the American Association for the Advancement of Science that helped define the magnitude and pace of Cenozoic carbon-cycle change and the role of feedbacks involving terrestrial carbon reservoirs, the Antarctic Ice Sheet, and ocean circulation changes like the Atlantic Meridional Overturning Circulation framed in studies with the National Oceanic and Atmospheric Administration.
Zachos has received recognition from organizations including the Geological Society of America, the American Geophysical Union, and awards connected to the National Science Foundation. He has been invited to deliver lectures at venues such as the Royal Society, the Smithsonian Institution, and major conferences hosted by the European Geosciences Union and the American Association for the Advancement of Science. His election to professional societies and receipt of career honors reflect contributions to paleoclimatology and marine geology promoted through partnerships with institutions like the Woods Hole Oceanographic Institution and the Scripps Institution of Oceanography.
- Zachos, J., et al., key syntheses on the Paleocene–Eocene Thermal Maximum and Cenozoic climate change published with collaborators from Lamont–Doherty Earth Observatory, Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, and University of Oxford. - Multisite records integrating Ocean Drilling Program data with isotope geochemistry and biostratigraphy coauthored with teams from the Integrated Ocean Drilling Program and Deep Sea Drilling Project. - Reviews and perspective pieces in journals associated with the American Geophysical Union, Nature Publishing Group, and the Royal Society Publishing summarizing carbon-cycle feedbacks, ocean acidification, and biotic responses during hyperthermal events. - Collaborative paleoceanography papers with researchers from Columbia University, University of California, Santa Cruz, University of California, Santa Barbara, and University of Rhode Island detailing benthic foraminiferal records and paleotemperature reconstructions.
Category:American geologists Category:Paleoclimatologists