Oxygen rise in the tropical upper ocean during the Paleocene-Eocene Thermal Maximum

• 成果类型: Article
• 署名作者: Moretti, Simone; Auderset, Alexandra; Deutsch, Curtis; Schmitz, Ronja; Gerber, Lukas; Thomas, Ellen; Luciani, Valeria; Petrizzo, Maria Rose; Schiebel, Ralf; Tripati, Aradhna; Sexton, Philip; Norris, Richard; D'Onofrio, Roberta; Zachos, James; Sigman, Daniel M.; Haug, Gerald H.; Martinez-Garcia, Alfredo
• 署名单位: Max Planck Society; Consiglio Nazionale delle Ricerche (CNR); NERC National Oceanography Centre; University of Southampton; Princeton University; Yale University; Wesleyan University; University of Ferrara; University of Milan; University of California System; University of California Los Angeles; University of California System; University of California Los Angeles; University of California System; University of California Los Angeles; Open University - UK; University of California System; University of California San Diego; Scripps Institution of Oceanography; University of California System; University of California Santa Cruz
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-13867
• DOI: 10.1126/science.adh4893
• 发表日期: 2024-02-16
• 页码: 727-731
• 关键词: odp site 865; planktonic-foraminifera; deep-sea; benthic foraminifera; isotopic analysis; methane hydrate; pacific-ocean; global ocean; climate; nitrogen

摘要

The global ocean's oxygen inventory is declining in response to global warming, but the future of the low-oxygen tropics is uncertain. We report new evidence for tropical oxygenation during the Paleocene-Eocene Thermal Maximum (PETM), a warming event that serves as a geologic analog to anthropogenic warming. Foraminifera-bound nitrogen isotopes indicate that the tropical North Pacific oxygen-deficient zone contracted during the PETM. A concomitant increase in foraminifera size implies that oxygen availability rose in the shallow subsurface throughout the tropical North Pacific. These changes are consistent with ocean model simulations of warming, in which a decline in biological productivity allows tropical subsurface oxygen to rise even as global ocean oxygen declines. The tropical oxygen increase may have helped avoid a mass extinction during the PETM.