Articles | Volume 11, issue 3
https://doi.org/10.5194/cp-11-559-2015
https://doi.org/10.5194/cp-11-559-2015
Research article
 | 
27 Mar 2015
Research article |  | 27 Mar 2015

Diminished greenhouse warming from Archean methane due to solar absorption lines

B. Byrne and C. Goldblatt

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Cited articles

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Byrne, B. and Goldblatt, C.: Radiative forcing at high concentrations of well-mixed greenhouse gases, Geophys. Res. Lett., 41, 152–160, https://doi.org/10.1002/2013GL058456, 2014.
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Driese, S. G., Jirsa, M. A., Ren, M., Brantley, S. L., Sheldon, N. D., Parker, D., and Schmitz, M.: Neoarchean paleoweathering of tonalite and metabasalt: implications for reconstructions of 2.69 Gyr early terrestrial ecosystems and paleoatmospheric chemistry, Precambrian Res., 189, 1–17, https://doi.org/10.1016/j.precamres.2011.04.003, 2011.
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Short summary
High methane concentrations are thought to have helped sustain warm surface temperatures on the early Earth (~3 billion years ago) when the sun was only 80% as luminous as today. However, radiative transfer calculations with updated spectral data show that methane is a stronger absorber of solar radiation than previously thought. In this paper we show that the increased solar absorption causes a redcution in the warming ability of methane in the Archaean atmosphere.