Comment on "A Hydrogen-Rich Early Earth Atmosphere"

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Comment on "A hydrogen-rich early Earth atmosphere".

Tian et al. (Reports, 13 May 2005, p. 1014) proposed a hydrogen-rich early atmosphere with slow hydrogen escape from a cold thermosphere. However, their model neglects the ultraviolet absorption of all gases other than H2. The model also neglects Earth's magnetic field, which affects the temperature and density of ions and promotes nonthermal escape of neutral hydrogen.

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A hydrogen-rich early Earth atmosphere.

We show that the escape of hydrogen from early Earth's atmosphere likely occurred at rates slower by two orders of magnitude than previously thought. The balance between slow hydrogen escape and volcanic outgassing could have maintained a hydrogen mixing ratio of more than 30%. The production of prebiotic organic compounds in such an atmosphere would have been more efficient than either exogeno...

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Detection of oxygen traces in nitrogen and hydrogen-rich atmosphere

Tin oxide sensors are evaluated to detect traces of oxygen in the range 0–100 ppm both in nitrogen and hydrogen (4.5 vol% H2 in N2) atmospheres. In nitrogen, significant relative responses to oxygen are measured at 623 K and 723 K. However, at lower temperature, 523 K, the response strongly decreases. In the presence of hydrogen, on the contrary, interesting responses are measured at 523 K. At ...

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Hydrogen-nitrogen greenhouse warming in Earth's early atmosphere.

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Formation and Early Evolution of Atmosphere and Ocean on the Earth

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ژورنال

عنوان ژورنال: Science

سال: 2006

ISSN: 0036-8075,1095-9203

DOI: 10.1126/science.1117827