Abstract
We implement a damage parametrization in the standard viscous-plastic
sea ice model to disentangle its effect from model physics
(visco-elastic or elasto-brittle vs. visco-plastic) on its ability to
reproduce observed scaling laws of deformation. To this end, we compare
scaling properties and multifractality of simulated divergence and shear
strain rate (as proposed in SIREx1), with those derived from the
RADARSAT Geophysical Processor System (RGPS). Results show that
including a damage parametrization in the standard viscous-plastic model
increases the spatial, but decreases temporal localization of simulated
Linear Kinematic Features, and brings all spatial deformation rate
statistics in line with observations from RGPS without the need to
increase the mechanical shear strength of sea ice as recently proposed
for lower resolution viscous-plastic sea ice models. In fact, including
damage an healing timescale of
$t_h=30\>$days and an increased
mechanical strength unveil multifractal behavior that does not fit the
theory. Therefore, a damage parametrization is a powerful tuning knob
affecting the deformation statistics.