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Statements

Subject Item
dbr:Diffusion-limited_escape
rdfs:label
Diffusion-limited escape
rdfs:comment
Diffusion-limited escape occurs when the rate of atmospheric escape to space is limited by the upward diffusion of escaping gases through the upper atmosphere, and not by escape mechanisms at the top of the atmosphere (the exobase). The escape of any atmospheric gas can be diffusion-limited, but only diffusion-limited escape of hydrogen has been observed in our solar system, on Earth, Mars, Venus and Titan. Diffusion-limited hydrogen escape was likely important for the rise of oxygen in Earth's atmosphere (the Great Oxidation Event) and can be used to estimate the oxygen and hydrogen content of Earth's prebiotic atmosphere.
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n6:Diffusion_limited_escape3.svg
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dbc:Origin_of_life dbc:Meteorological_hypotheses dbc:Oxygen dbc:Hydrogen dbc:Proterozoic dbc:Atmosphere
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60817325
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dbr:Heterosphere dbc:Oxygen dbr:Turbopause dbc:Origin_of_life dbr:Polar_wind dbr:Photolysis dbr:Exobase dbc:Proterozoic dbc:Hydrogen dbr:Atmospheric_escape dbr:Hydrostatic_equation dbr:Great_Oxygenation_Event dbc:Meteorological_hypotheses dbr:Mars dbr:Homosphere dbr:Cassini–Huygens dbr:Mariner_6_and_7 dbr:Chain_rule dbr:Tropopause dbr:Exosphere dbr:Venus dbc:Atmosphere dbr:Stoichiometry dbr:Escape_velocity dbr:Troposphere dbr:Titan_(moon) dbr:Earth n15:Diffusion_limited_escape3.svg dbr:Ultraviolet dbr:Boltzmann_constant dbr:Boltzmann_equation dbr:Jeans_Escape dbr:Volume_fraction
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dbo:abstract
Diffusion-limited escape occurs when the rate of atmospheric escape to space is limited by the upward diffusion of escaping gases through the upper atmosphere, and not by escape mechanisms at the top of the atmosphere (the exobase). The escape of any atmospheric gas can be diffusion-limited, but only diffusion-limited escape of hydrogen has been observed in our solar system, on Earth, Mars, Venus and Titan. Diffusion-limited hydrogen escape was likely important for the rise of oxygen in Earth's atmosphere (the Great Oxidation Event) and can be used to estimate the oxygen and hydrogen content of Earth's prebiotic atmosphere. Diffusion-limited escape theory was first used by Donald Hunten in 1973 to describe hydrogen escape on one of Saturn's moons, Titan. The following year, in 1974, Hunten found that the diffusion-limited escape theory agreed with observations of hydrogen escape on Earth. Diffusion-limited escape theory is now used widely to model the composition of exoplanet atmospheres and Earth's ancient atmosphere.
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wikipedia-en:Diffusion-limited_escape