Oxygen-poor zones shrank under past warm periods, scientists discover

15N data, from this study (872/516) and from Kast et al. (1209/1263), and open circles indicate cores with foraminiferal δ18O data discussed in the text (and references therein). Dissolved O2 concentrations (in μmol kg−1) are shown in color. Credit: Nature (2022). DOI: 10.1038/s41586-022-05017-0″ width=”800″ height=”438″/> Sites from which core data are reported or discussed, plotted … Read more