Technical Comments

Response to Comment on "A Hydrogen-Rich Early Earth Atmosphere"

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Science  06 Jan 2006:
Vol. 311, Issue 5757, pp. 38
DOI: 10.1126/science.1118412

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Catling speculates that the exobase of early Earth was hot and that the ancient nonthermal escape rate was more than 1000 times the present rate. However, low oxygen and high carbon dioxide on early Earth yields a cold exobase, and nonthermal escape rates are limited and cannot balance the volcanic outgassing of hydrogen.

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