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Multiscale mushy layer model for Arctic marginal ice zone dynamics.

Courtenay Strong1, Elena Cherkaev2, Kenneth M Golden2

  • 1Department of Atmospheric Sciences, University of Utah, Salt Lake City, UT, USA. court.strong@utah.edu.

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|September 3, 2024
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Summary
This summary is machine-generated.

A new mathematical model treats the Arctic marginal ice zone (MIZ) as a phase transition. This model accurately captures MIZ location and width dynamics, crucial for understanding Arctic climate and accessibility.

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Area of Science:

  • Oceanography
  • Climate Science
  • Mathematical Modeling

Background:

  • The Arctic marginal ice zone (MIZ) is a highly dynamic region between pack ice and open ocean.
  • It undergoes significant seasonal changes in width and location, impacting climate and ecosystems.

Purpose of the Study:

  • To develop a novel mathematical model for understanding Arctic MIZ dynamics.
  • To simulate and explain the seasonal cycles of MIZ location and width using satellite observations.

Main Methods:

  • Modeling the MIZ as a liquid-solid phase transition region (mushy zone).
  • Applying phase change physics and homogenization theory to a multiscale composite material model.
  • Solving a nonlinear heat equation for upper ocean temperature.

Main Results:

  • The model successfully captures 96% of the annual cycle of MIZ location and 78% of MIZ width.
  • MIZ location correlates with the 273 K isotherm below the ice.
  • MIZ width is linked to vertical heat flux convergence with a three-week lag.

Conclusions:

  • The phase transition model provides a robust framework for studying Arctic MIZ behavior.
  • Understanding MIZ dynamics is essential for predicting climate change impacts and Arctic accessibility.