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Premelting controlled active matter in ice.

Jérémy Vachier1, J S Wettlaufer1,2

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Summary
This summary is machine-generated.

Biological particles in ice exhibit active Ornstein-Uhlenbeck dynamics during thermal regelation. This activity enhances diffusion, impacting ice core dating and understanding extremophile behavior.

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Area of Science:

  • Physics of active matter
  • Geophysics and cryosphere science
  • Biophysics

Background:

  • Self-propelled particles exhibit complex dynamics influenced by bulk and surface interactions.
  • Interfacial premelting occurs when a particle is embedded in a host solid near its melting temperature.
  • Thermal regelation drives particles from low to high temperatures via a thermomolecular pressure gradient.

Purpose of the Study:

  • To investigate the combined influence of biological activity and thermal regelation on bioparticle redistribution in ice.
  • To model these phenomena using the stochastic framework of active Ornstein-Uhlenbeck dynamics.
  • To assess the impact of thermal regelation on paleoclimate studies, specifically ice core dating.

Main Methods:

  • Recasting regelation phenomena within the active Ornstein-Uhlenbeck dynamics framework.
  • Analyzing the interplay between particle activity and thermal gradients.
  • Quantifying the effect of biological activity on particle diffusion during thermal regelation.

Main Results:

  • Biological activity enhances the effective diffusion coefficient of particles during thermal regelation.
  • Thermal regelation influences the redistribution of bioparticles in icy environments.
  • The study provides predictions relevant to biological and geophysical problems.

Conclusions:

  • Accurate ice core dating requires a quantitative treatment of both thermal regelation and biological activity.
  • Understanding active matter dynamics in cryospheres is crucial for paleoclimate research.
  • The findings have implications for studying extremophiles and ecological dynamics.