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\title{Evidence of abrupt transitions between sea ice dynamical regimes in the
East Greenland marginal ice zone}



\author[1]{Daniel Mark Watkins}%
\author[2]{Angela C. Bliss}%
\author[3]{Jennifer Katy Hutchings}%
\author[4]{Monica Martinez Wilhelmus}%
\affil[1]{Brown University}%
\affil[2]{NASA Goddard Space Flight Center}%
\affil[3]{Oregon State University}%
\affil[4]{Center for Fluid Mechanics, School of Engineering, Brown University}%


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  \date{May 08, 2026}


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\begin{abstract}
Sea ice modulates the energy exchange between the atmosphere and the
ocean through its kinematics. Marginal ice zone (MIZ) dynamics are
complex and are not well resolved in routine observations. Here, we
investigate sea ice dynamics in the Greenland Sea MIZ using two
Lagrangian drift datasets. We find evidence of tidal currents strongly
affecting sub-daily sea ice motion. Velocity anomalies show abrupt
transitions aligned with gradients in seafloor topography, indicating
changes in ocean currents. Remote-sensed ice floe trajectories derived
from moderate resolution satellite imagery provide a view of small-scale
variability across the Greenland continental shelf. Ice floe
trajectories reveal an west-east increasing velocity gradient imposed by
the East Greenland Current, with maximum velocities aligned along the
continental shelf edge. These results highlight the importance of small
scale ocean variability for ice dynamics in the MIZ.%
\end{abstract}%



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