Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p51d1471a&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P51D-1471
Other
[5422] Planetary Sciences: Solid Surface Planets / Ices, [5462] Planetary Sciences: Solid Surface Planets / Polar Regions, [5754] Planetary Sciences: Fluid Planets / Polar Regions, [6225] Planetary Sciences: Solar System Objects / Mars
Scientific paper
The layered deposits that consist from ice and dust in the polar cap of Mars were discovered by Martian exploration in recent years. As for the periodicity of the layer structure, it is pointed out that the periodicity is correlated with insolation variation. It is well known that the insolation variation is the primary element that causes the climate change. Such correlation is confirmed by the ice cores from Greenland and the South Pole for the Earth, and is used as an index of a past climate change in paleoclimate study. If similar study can be done on Mars, it will become possible to examine the past climate change on Mars. On the other hand, in the Martian north pole, it was pointed out that there is a strong correlation in the altitudinal change of the radiance of the layered deposit seen in the image data and the past insolation variation for the Arctic summer solstice for the north polar region [Laskar et al., 2002]. Moreover, the past climate change was also examined for the south polar region using similar method [Moroi et al., 2008]. However, these examples are only for a single location in each polar region, and evaluated only subjectively. Here, the present study aims to improve more positive proof of the correlation between the radiance change of the layered deposit and the amount of insolation on Mars by increasing analysis examples. In the present study, optical image data obtained by High Resolution Imaging Science Experiment(HiRISE) on board the Mars Reconnaissance Orbiter and the altimeter data obtained by Mars Orbiter Laser Altimeter(MOLA) on board the MGS. The optical image data are mainly from the locations showing geographical feature of cliffs exposing the layer structures with large altitude difference in the Martian south pole,. Moreover, horizontal distribution of similar layered deposit is examined.
Akisato K.
Okano Shinya
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