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Loss of atmosphere from Mars due to solar wind-induced sputteringBecause Mars does not have a strong intrinsic magnetic field, the atmosphere is eroded by interactions with the solar wind. Early solar-system conditions enhanced the sputtering loss. It is calculated that approximately 3 bars of carbon dioxide (CO2) have been sputtered over the last 3.5 billion years. This significant increase over the previous estimate by Luhmann et al. of approximately 0.14 bar of CO2 is the result of the development of a more complete model. The model also predicts slightly greater loss of water--approximately 80 meters instead of the approximately 50 meters predicted by Luhmann et al. Because estimates of CO2 on early Mars range from 0.5 to 5 bars, the 0.14-bar estimate is insignificant but the approximately 3-bar estimate will have a large effect on our understanding of the planet's evolution.
Document ID
20050000193
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kass, D. M.
(California Institute of Technology Pasadena 91125, United States)
Yung, Y. L.
Date Acquired
August 22, 2013
Publication Date
May 5, 1995
Publication Information
Publication: Science
Volume: 268
Issue: 5211
ISSN: 0036-8075
Subject Category
Lunar And Planetary Science And Exploration
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Exobiology
NASA Discipline Number 52-20
NASA Program Exobiology
Non-NASA Center

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