22 Aug 2022
22 Aug 2022

A quasi-objective single buoy approach for Lagrangian coherent structures and sea ice fracture events

Nikolas O. Aksamit1,2, Randall K. Scharien1, and Jennifer K. Hutchings3 Nikolas O. Aksamit et al.
  • 1Department of Geography, University of Victoria, Canada
  • 2School of Earth and Environment, University of Canterbury, New Zealand
  • 3College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, USA

Abstract. Sea ice deformation and dynamics play a significant role in atmosphere-ice-ocean coupling. Deformation patterns in sea ice can be observed at a wide range of spatial scales, though high resolution objective quantification of these features remains difficult. In an effort to better understand local deformation of sea ice, we adapt the Trajectory Stretching Exponents (TSEs), quasi-objective measures of Lagrangian stretching in continuous media, to sea ice buoy data, and develop a temporal analysis of TSE time series. TSEs provide an approximation of Lagrangian coherent structure diagnostics when only sparse trajectory data is available. As TSEs do not require multiple buoys, we find they have an expanded range of use when compared with traditional Eulerian buoy-array deformation metrics, and provide local-stretching information below the length-scales possible when averaging over buoy-arrays. We verify the ability of TSEs to temporally and spatially identify dynamic fracture events for three different sea ice datasets, with buoys identifying fracture domains ranging tens to hundreds of kilometers in diameter.

Nikolas O. Aksamit et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-519', Anonymous Referee #1, 07 Sep 2022
  • RC2: 'Comment on egusphere-2022-519', Harry Heorton, 28 Sep 2022
  • RC3: 'Comment on egusphere-2022-519', Marcello Vichi, 28 Sep 2022

Nikolas O. Aksamit et al.

Nikolas O. Aksamit et al.


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Latest update: 02 Feb 2023
Short summary
Coherent flow patterns in sea ice have a significant influence on sea ice fracture and refreezing. We can better understand the state of sea ice, and its influence on the atmosphere and ocean, if we know these structures. Adapting recent developments in chaotic dynamical systems and applied mathematics, we are able to approximate ice stretching surrounding individual ice buoys. This illuminates the state of sea ice at much higher resolution, and allows us to see previously invisible patterns.