Observatoire Midi-Pyrénées

Marine arsenate evolution during Proterozoic oxygenation events and implications for biological phosphate metabolism

Abstract Earth’s atmosphere and oceans experienced two major episodes of ocean-atmosphere oxygenation that transformed the planet and shaped the evolution of the oxygen-rich biosphere between 2.45 and 0.541 billion years ago (Ga). These changes increased the abundance of oxidized...

Radiative Transfer with Partially Frequency Coherent Scattering

We consider a spectral line formed with a linear combination of monochromatic scattering and complete frequency redistribution. A previous theoretical and numerical investigation by Hemsch and Ferziger in 1971 and 1972 suggests that a very small percentage of complete frequency r...