The water-ice-rich north polar layered deposits (NPLD)
of Mars play a key role in the Martian climate through
an active exchange of water vapor with the atmosphere.
Conditions are not currently amenable for flow of the
NPLD; however, gross morphological evidence for past
flow suggests the possibility of a warmer climate in the
past. Here we present the first comparison of internal
stratigraphy predicted by a flow model with that observed
by an orbital radar sounder. We have analyzed radar data
from Gemina Lingula, the southernmost tongue of the
NPLD, acquired by the Shallow Radar on board NASA’s
Mars Reconnaissance Orbiter. The data shows extensive
internal reflections and several radar reflectors were
mapped to create gridded surfaces of this part of the NPLD.
All the mapped radar reflectors were smooth with no
sudden dips towards the surface or the bedrock. The
internal radar reflectors were then compared with modeled
isochrones in two different areas of Gemina Lingula under
the assumption of flow occurring. Results indicate that flow
of ice is unlikely to have occurred between the main dome
and Gemina Lingula. Furthermore, we found no evidence
for the existence of a prior ablation zone in Gemina Lingula
as predicted in another study
Is data on this page outdated, violates copyrights or anything else? Report the problem now and we will take corresponding actions after reviewing your request.