Availability of O(2) and H(2)O(2) on pre-photosynthetic Earth.

  title={Availability of O(2) and H(2)O(2) on pre-photosynthetic Earth.},
  author={Jacob D. Haqq-Misra and James F Kasting and Sukyoung Lee},
  volume={11 4},
Old arguments that free O(2) must have been available at Earth's surface prior to the origin of photosynthesis have been revived by a new study that shows that aerobic respiration can occur at dissolved oxygen concentrations much lower than had previously been thought, perhaps as low as 0.05 nM, which corresponds to a partial pressure for O(2) of about 4 × 10(-8) bar. We used numerical models to study whether such O(2) concentrations might have been provided by atmospheric photochemistry… CONTINUE READING

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