Martian Ice: A Find Just a Meter Deep ⚡ экспресс
Using an improved version of the Mars Planetary Climate Model, calculations show that subsurface ice at mid-latitudes could be a remnant of a layer deposited during an epoch of high planetary obliquity. Assuming the ice sublimated and was covered by a residual soil layer (sublimation lag), estimates indicate: ice that fell 630,000 years ago at a 35° tilt on latitudes 40–55° N would today lie at a depth of 25–150 cm; for the 4.18 million years ago scenario at 40° — at 41–255 cm, depending on regolith and ice properties. Model depths for the 630,000-year-old ice match observations and reproduce longitudinal variations, unlike the older scenario. Consequently, the mid-latitude subsurface ice is younger than 4 million years.
Beneath a thin layer of red dust on Mars lies water ice. Its presence was confirmed by the Phoenix lander and orbital instruments, but the mystery remained: why is the ice always just a few centimeters below the surface?
The answer lies in the wobbles of Mars' axial tilt. When the tilt is high, water vapor from the poles falls as frost in the mid-latitudes. As the tilt decreases, the frost sublimates, leaving behind dust. A porous crust forms — a dust blanket that slows the evaporation of the remaining ice.
Climate modeling revealed: ice deposited around 630,000 years ago now sits at a depth of 25–150 cm, matching observations. The conclusion: subsurface ice is young — less than 4 million years old. Without the dust blanket, it would vanish in centuries. But the crust acts as a self-regulator: the stronger the evaporation, the thicker the protection, and the ice persists for millions of years. For colonists, this means: water is nearby, no need to dig deep.
🎯 On Mars, ice behaves like dry ice on a theater stage: it slowly evaporates, skipping the liquid phase, leaving only a dusty trail.
🎬 In the movie 'The Martian,' the hero extracts water from the soil — exactly as can be done with subsurface ice on Mars.