Comment on "A hydrogen-rich early Earth atmosphere"

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 temper...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2006-01, Vol.311 (5757), p.38; author reply 38-38
1. Verfasser: Catling, David C
Format: Artikel
Sprache:eng
Schlagworte:
Atmosphere
Carbon Dioxide
Earth (Planet)
Evolution, Chemical
Helium
Hydrogen
Organic Chemicals - chemistry
Temperature
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Zusammenfassung: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1117827