Ancient atmospheric oxygen sleuthing with ocean chromium

Ancient atmospheric oxygen sleuthing with ocean chromium

\"People have seen the that chromium isotopes in the geological records kind of track the atmospheric oxygen levels. \"In addition, there is ongoing concern about the past few decades of decreasing oceanic oxygen levels in the ocean, and we need tools to better understand the ocean's oxygen dynamics.\" They charted this against the samples' oxygen levels and put the results in context of known ocean features to help explain how chromium is cycling. In surface, oxygenated ocean, hexavalent chromium was consumed, likely by microbial life, and transported deeper, into the ODZ. Trivalent chromium isotopes in the eastern tropical North Pacific oxygen-deficient zone, Proceedings of the National Academy of Sciences (2021).

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