Evidence of Abrupt Transitions Between Sea Ice Dynamical Regimes in the East Greenland Marginal Ice Zone

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 in situ and remote sensing...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Daniel M. Watkins, Angela C. Bliss, Jennifer K. Hutchings, Monica M. Wilhelmus
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2023
Subjects:
sea ice dynamics
air‐ice‐ocean coupling
Geophysics. Cosmic physics
QC801-809
East Greenland
east greenland current
Greenland
Greenland Sea
Sea ice
Online Access:https://doi.org/10.1029/2023GL103558
https://doaj.org/article/a6b80b253efb453682b523a18f41df65
Description
Summary: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 in situ and remote sensing Lagrangian drift datasets. These datasets provide a unique view into ice dynamics spanning spatial scales. We find evidence of tidal currents strongly affecting sub‐daily 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 a 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.

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