Greenhouse warming by CH4 in the atmosphere of early Earth.

@article{Pavlov2000GreenhouseWB,
  title={Greenhouse warming by CH4 in the atmosphere of early Earth.},
  author={A. Pavlov and J. Kasting and L. L. Brown and K. Rages and R. Freedman},
  journal={Journal of geophysical research},
  year={2000},
  volume={105 E5},
  pages={
          11981-90
        }
}
Earth appears to have been warm during its early history despite the faintness of the young Sun. Greenhouse warming by gaseous CO2 and H2O by itself is in conflict with constraints on atmospheric CO2 levels derived from paleosols for early Earth. Here we explore whether greenhouse warming by methane could have been important. We find that a CH4 mixing ratio of 10(-4) (100 ppmv) or more in Earth's early atmosphere would provide agreement with the paleosol data from 2.8 Ga. Such a CH4… Expand
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