Physics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3405201f&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 5, CiteID L05201
Physics
13
Cryosphere: Permafrost (0475), Cryosphere: Ice (1863), Planetary Sciences: Solid Surface Planets: Polar Regions, Planetary Sciences: Solar System Objects: Mars
Scientific paper
Neutron leakage currents measured using the Mars Odyssey Neutron Spectrometer are used to develop a two-layer model of the distribution of hydrogen (here parameterized as water-equivalent hydrogen, WEH) at high northern latitudes. The WEH abundance in the upper layer, Wup, was found to range between 1% and about 5%. The maximum value of the apparent thickness, D, of this upper layer peaks at about 60° latitude, giving the appearance of zonal bands of enhanced D in both hemispheres. This maximum is consistent with an expected transition from WEH contained solely in hydrous minerals at lower latitudes, to WEH contained both in the forms of water ice and water of hydration at high latitudes. A strong anti-correlation between the WEH concentration in the lower layer and apparent depth, D, at high latitudes is observed and may provide clues to the origin of these deposits.
Diez Benedicte
Elphic Richard C.
Feldman William C.
Gasnault Olivier
Hagerty Justin J.
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