Preprints
https://doi.org/10.5194/tc-2022-128
https://doi.org/10.5194/tc-2022-128
16 Aug 2022
 | 16 Aug 2022
Status: a revised version of this preprint was accepted for the journal TC and is expected to appear here in due course.

Observing sea ice flexural-gravity waves with ground-based radar interferometry

Dyre Oliver Dammann, Mark A. Johnson, Andrew R. Mahoney, and Emily R. Fedders

Abstract. We investigate the application of ground-based radar interferometry for measuring flexural-gravity waves in sea ice. We deployed a Gamma Portable Radar Interferometer (GPRI) on top of a grounded iceberg surrounded by landfast sea ice near Utqiaġvik, Alaska. The GPRI collected 238 acquisitions in stare-mode during a period of moderate lateral ice motion during 23–24 Apr 2021. Individual 30-second interferograms exhibit ~20–50 s periodic motion indicative of propagating infragravity waves with ~1 mm amplitudes. Results include examples of onshore wave propagation at the speed predicted by the water depth and a possible edge wave along an ice discontinuity. Findings are supported through comparison with on-ice Ice Wave Rider (IWR) accelerometers and modeled wave propagation. These results suggest that the GPRI can be a valuable tool to track wave propagation through sea ice and possibly detect changes in such properties across variable ice conditions.

Dyre Oliver Dammann et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-128', Aleksey Marchenko, 29 Sep 2022
  • RC2: 'Comment on tc-2022-128', Jim Thomson, 19 Oct 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-128', Aleksey Marchenko, 29 Sep 2022
  • RC2: 'Comment on tc-2022-128', Jim Thomson, 19 Oct 2022

Dyre Oliver Dammann et al.

Dyre Oliver Dammann et al.

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Short summary
We investigate the Gamma Portable Radar Interferometer (GPRI) as a tool for evaluating flexural-gravity waves in sea ice in near real time. With a GPRI mounted on grounded ice near Utqiaġvik, Alaska, we identify 20 to 50-second infragravity waves in landfast ice with ~1 mm amplitude during 23–24 Apr 2021. Observed wave speed and periods compare well with modeled wave propagation and on-ice accelerometers confirming the ability to track propagation and properties of waves over hundreds of meters.