Accretion, loss, and fractionation of martian water |
| |
| Authors: | Thomas M Donahue |
| |
| Institution: | a Department of Atmospheric, Oceanic and Space Science, 2455 Hayward Street, Ann Arbor, MI 48109-2143, USA
b Department of Physics, The University of Michigan, Ann Arbor, MI 48109-2143, USA |
| |
| Abstract: | A recently published model for accretion of water by Mars from asteroids and comets beyond 2.5 AU calls for Mars to have accreted 6-27% of Earth's ocean (equivalent to 600-2700 meters depth on Mars' surface) with a D/H ratio 1.2-1.6 times Standard Mean Ocean Water. This model is shown to provide enough outgassed water to account for the subsequent evolution of D/H because of loss of hydrogen and the D/H ratio in water of hydration found in martian meteoric minerals, but enhanced rate loss of hydrogen from early Mars is necessary to permit adequate fractionation to occur during the lifetime of the planet. |
| |
| Keywords: | Origin Solar System Mars interior Mars atmosphere |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
