Scientists: Dry ice glaciers at Mars’ south pole ice cap are active and moving

The moving glaciers are mostly thought to be in the dark troughs on
the edge of the dry ice topping the perennial cap, flowing down to
pond on the water ice below.
The uncertainty of science: According to a newly published paper, scientists have concluded that some of the dry ice glaciers at the Martian south pole ice cap are still active and moving, flowing into basins which allow them to survive longer during warm periods.
Carbon dioxide (CO2) ice is found in a stack of deposits at Mars’ south pole. These deposits are situated in basins, where they reach more than 1 km thick. Previous work suggested that the CO2 ice should be deposited when the axial tilt of the planet was lower, making the poles colder than they are now; however, the thickness and distribution of this ice should be much thinner than observed if only atmospheric effects are working on the ice. Therefore, the CO2 ice deposit distribution cannot be explained by atmospheric deposition alone. In this paper, we use glacial modeling and feature analysis to demonstrate that glacial flow better explains the distribution of ice in its present state. In addition, we show that the slopes on the south polar cap act to focus glacial flow into the basins, where it can survive warm periods by sublimating only the uppermost sections when the tilt of the planet is larger than present day.
The scientists estimate that the motion of these glaciers began approximately 600,000 years ago. According to Isaac Smith of the Planetary Science Institute in Arizona, the paper’s lead author:
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The moving glaciers are mostly thought to be in the dark troughs on
the edge of the dry ice topping the perennial cap, flowing down to
pond on the water ice below.
The uncertainty of science: According to a newly published paper, scientists have concluded that some of the dry ice glaciers at the Martian south pole ice cap are still active and moving, flowing into basins which allow them to survive longer during warm periods.
Carbon dioxide (CO2) ice is found in a stack of deposits at Mars’ south pole. These deposits are situated in basins, where they reach more than 1 km thick. Previous work suggested that the CO2 ice should be deposited when the axial tilt of the planet was lower, making the poles colder than they are now; however, the thickness and distribution of this ice should be much thinner than observed if only atmospheric effects are working on the ice. Therefore, the CO2 ice deposit distribution cannot be explained by atmospheric deposition alone. In this paper, we use glacial modeling and feature analysis to demonstrate that glacial flow better explains the distribution of ice in its present state. In addition, we show that the slopes on the south polar cap act to focus glacial flow into the basins, where it can survive warm periods by sublimating only the uppermost sections when the tilt of the planet is larger than present day.
The scientists estimate that the motion of these glaciers began approximately 600,000 years ago. According to Isaac Smith of the Planetary Science Institute in Arizona, the paper’s lead author:
» Read more