CO2 snow depth and subsurface water-ice abundance in the northern hemisphere of Mars.
Observations of seasonal variations of neutron flux from the high-energy neutron detector (HEND) on Mars Odyssey combined with direct measurements of the thickness of condensed carbon dioxide by the Mars Orbiter Laser Altimeter (MOLA) on Mars Global Surveyor show a latitudinal dependence of northern winter deposition of carbon dioxide. The observations are also consistent with a shallow substrate consisting of a layer with water ice overlain by a layer of drier soil. The lower ice-rich layer contains between 50 and 75 weight % water, indicating that the shallow subsurface at northern polar latitudes on Mars is even more water rich than that in the south.
Mitrofanov
I G
IG
Space Research Institute, Russian Academy of Sciences, Moscow, 117997, Russia. imitrofa@space.ru
Zuber
M T
MT
Litvak
M L
ML
Boynton
W V
WV
Smith
D E
DE
Drake
D
D
Hamara
D
D
Kozyrev
A S
AS
Sanin
A B
AB
Shinohara
C
C
Saunders
R S
RS
Tretyakov
V
V
D001272:Atmosphere; D004367:Dry Ice; D005118:Extraterrestrial Environment; D018535:Mars; D012621:Seasons; D014867:Water / Q000032:analysis*
D004367:Dry Ice; D014867:Water