Implications of the Gas Compositional Measurements of Pioneer Venus for the Origin of Planetary Atmospheres

  title={Implications of the Gas Compositional Measurements of Pioneer Venus for the Origin of Planetary Atmospheres},
  author={James B. Pollack and David Charles Black},
  pages={56 - 59}
Comparisons are made between the volatile inventories of the terrestrial planets, including Pioneer Venus data, and the predictions of three classes of theories for the origin of planetary atmospheres. Serious difficulties arise for the primary atmosphere and external source hypotheses. The grain accretion hypothesis can account for the trends in the volatile inventory from Venus to Earth to Mars, if volatiles were incorporated into planet-forming grains at nearly the same temperature for all… 
Chemical composition of Earth, Venus, and Mercury.
  • J. Morgan, E. Anders
  • Geology, Physics
    Proceedings of the National Academy of Sciences of the United States of America
  • 1980
Review of available data shows only a few gross trends for the inner planets: FeO decreases with heliocentric distance, whereas volatiles are depleted and refractories are enriched in the smaller planets.
Inferences from Other Bodies for the Earth's Composition and Evolution
Properties of the earth are considered in the light of the earth's presumed status as an end member of the class of predominantly silicate solar system bodies. Bulk composition data for the inner
Volatile Inventory and Early Evolution of the Planetary Atmospheres
Formation of atmospheres of the inner planets involved the concurrent processes of mantle degassing and collisions that culminated during the heavy bombardment. Volatile-rich icy planetesimals
Spacecraft and groundbased observations of the atmospheres of solar system objects have provided a definition of their present characteristics and have yielded clues about their past history. Table 1
Noble gases in the terrestrial planets
Abundances of primordial noble gases are lower for Mars than for Earth, but are higher for Venus. The data for Venus are attributed to implantation of solar wind in small preplanetary particles.
Planetary science: Evolution by bombardment?
604 Planetary science NEWS AND VIEWS Evolution by bombardment? from Michael Prather THE atmospheres of the planets contain a cryptic record of the origin and evolu- tion of our Solar System. The


Implications of the Viking results for volatile outgassing from Earth and Mars
TUREKIAN and Clark1 have recently discussed an inhomogeneous accumulation model for terrestrial planets, have compared the outgassing product from a veneer of carbonaceous chondrites with the
Development of the Atmosphere of Venus
Venus Lower Atmospheric Composition: Preliminary Results from Pioneer Venus
Initial examination of data from the neutral mass spectrometer on the Pioneer Venus sounder probe indicates that the abundances of argon-36, argon-38, and neon-20 in the Venus atmosphere are much
The composition of the atmosphere at the surface of Mars
We have confirmed the discovery of N2 and 40Ar by the Entry Science Team, and we have also detected Ne, Kr, Xe, and the primordial isotopes of Ar. The noble gases exhibit an abundance pattern similar
The origin and relative abundances of C, N and the noble gases on the terrestrial planets and in meteorites
RASOOL and Le Sergeant1 adopted the inhomogeneous accretion model for planets discussed by Turekian and Clark2 and considered the question of whether carbonaceous chondrites or LL chondrites could
Mars and Earth: Origin and Abundance of Volatiles
The perspective gained through the present investigation suggests that this is not a necessary condition for planets at the distance of Mars from a solar-type central star, and if it turns out that Mars is completely devoid of life, this does not mean that the zones around stars in which habitable planets can exist are much narrower than has been thought.
Hydrogen Loss from the Terrestrial Planets
The idea of escape of light atmospheric gas is older than the kinetic theory, having been introduced by J. L. Waterston in 1846 (Chamberlain 1963). The thermal escape concept was revived by G. J.
Composition and Structure of the Venus Atmosphere: Results from Pioneer Venus
There is a large excess of all primordial noble gases on Venus relative to Earth, and there appears to be a considerably higher abundance of sulfur compounds below 20 kilometers than in or above the main cloud layer.