Stone circles: form and soil kinematics.

Area of Science:

• Geomorphology
• Soil Science
• Cryospheric Science

Background:

• Distinct surface patterns, such as sorted circles, are common in polar and alpine soils where ground temperatures fluctuate around 0°C.
• These patterns represent striking examples of abiotic self-organization in nature.
• Sorted circles are characterized by exceptional geometric regularity and are actively forming and evolving.

Purpose of the Study:

• To outline the interplay of frost-related physical processes responsible for the spontaneous formation of soil surface patterns.
• To present unique, long-term data documenting subsurface soil rotational motion and surface displacement within sorted circles.
• To facilitate the assessment of numerical models for sorted circle development through detailed field observations.

Main Methods:

• Field observations of soil surface patterns and displacement over a 20-year period.
• Documentation of subsurface soil rotational motion.
• Utilizing well-developed sorted circles as research sites for comprehensive characterization.

Main Results:

• Unique data documenting subsurface soil rotational motion and surface displacement over two decades.
• Observations provide detailed insights into the dynamic evolution of sorted circles.
• Field data are suitable for assessing and refining numerical models of sorted circle development.

Conclusions:

• Frost-related physical processes are key drivers of self-organizing soil patterns in cold environments.
• Long-term monitoring of sorted circles provides critical data for understanding geomorphological processes.
• Synergistic studies combining field data and numerical modeling offer significant potential for advancing research in this area.