Bekker dating rise atmospheric oxygen
The resulting low phosphorus concentrations would have substantially hampered primary productivity, contributing to the delayed rise of atmospheric oxygen.).
Estimating P concentrations in the ocean across Earth’s history is thus critical for understanding the growth of the biosphere and the evolution of major biogeochemical cycles—namely, the rise of atmospheric oxygen, which requires substantial burial of organic carbon generated via oxygenic photosynthesis.
This large discrepancy between supply and demand is sustained by the efficient recycling of P within the ocean.
In the modern ocean, ~80 to 90% of primary productivity gets remineralized in the photic zone (upper, ~200 m; fig.