Greenhouse warming by CH4in the atmosphere of early Earth
نویسندگان
چکیده
منابع مشابه
Hydrogen-nitrogen greenhouse warming in Earth's early atmosphere.
Understanding how Earth has sustained surface liquid water throughout its history remains a key challenge, given that the Sun's luminosity was much lower in the past. Here we show that with an atmospheric composition consistent with the most recent constraints, the early Earth would have been significantly warmed by H(2)-N(2) collision-induced absorption. With two to three times the present-day...
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Introduction: A building body of evidence from recent Mars exploration missions suggests that sulfur chemistry may have played a prominent role in the planet’s early evolution. Although the Martian atmosphere contains virtually no sulfur species at present, both soils and outcrop observed by landed missions have high sulfate abundances [1,2]. The OMEGA hyperspectral imager has now also identifi...
متن کاملTransient reducing greenhouse warming on early Mars
The evidence for abundant liquid water on early Mars despite 3 the faint young Sun is a long-standing problem in planetary research. Here 4 we present new ab initio spectroscopic and line-by-line climate calculations 5 of the warming potential of reduced atmospheres on early Mars. We show 6 that the strength of both CO2-H2 and CO2-CH4 collision-induced absorp7 tion (CIA) has previously been sig...
متن کاملSulfur-induced greenhouse warming on early Mars
[1] Mineralogical, geological, geophysical, and isotopic data recently returned from Mars suggest that the delivery of sulfur gases to the atmosphere may have played a significant role in the planet’s early evolution. Using the Gusev Crater basalt composition and a batch melting model, we obtain a high sulfur solubility, approximately 1400 ppm, in Martian mantle melts. We proceed to explore dif...
متن کاملA 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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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Planets
سال: 2000
ISSN: 0148-0227
DOI: 10.1029/1999je001134