Decadal oscillations in the ocean's largest oxygen-deficient zone

• 成果类型: Article
• 署名作者: Duprey, N. N.; Foreman, A. D.; Carriquiry, J. D.; Charles, C. D.; Sanchez, S. C.; Vonhof, H.; Rubach, F.; Rabenstein, R.; Rohr, M.; Reyes-Bonilla, H.; Marconi, D.; Sigman, D. M.; Haug, G. H.; Martinez-Garcia, A.
• 署名单位: Max Planck Society; University of California System; University of California San Diego; Scripps Institution of Oceanography; University of Colorado System; University of Colorado Boulder; Leibniz Association; Senckenberg Gesellschaft fur Naturforschung (SGN); Universidad Autonoma de Baja California; Princeton University; Swiss Federal Institutes of Technology Domain; ETH Zurich
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-13809
• DOI: 10.1126/science.adk4965
• 发表日期: 2024-11-29
• 页码: 1019-1024
• 关键词: bound organic nitrogen; isotopic composition; california current; pacific; variability; nitrate; delta-n-15; undercurrent; calibration; mechanisms

摘要

The impact of global warming on the ocean's oxygen-deficient zones (ODZs) is uncertain, partly because of a lack of data on past changes. We report monthly resolved records of coral skeleton-bound nitrogen isotopes (CS-delta 15N) to reconstruct denitrification in the Eastern Tropical North Pacific (ETNP) ODZ over the last 80 years. The data indicate strong decadal variation in ETNP denitrification, with maxima during the cool North Pacific phase of Pacific Decadal Variability. The maxima in denitrification (and thus oxygen deficiency) were likely due to stronger upwelling that enhanced productivity leading to greater oxygen demand in the thermocline. Prior findings of multidecadal-to-centennial ODZ trends were likely biased by this variability. ODZ evolution over the next century will depend on how global warming interacts with the decadal oscillations.