Preprints
https://doi.org/10.5194/tc-2022-128
https://doi.org/10.5194/tc-2022-128
 
16 Aug 2022
16 Aug 2022
Status: this preprint is currently under review for the journal TC.

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

Dyre Oliver Dammann1,2, Mark A. Johnson3, Andrew R. Mahoney1, and Emily R. Fedders1 Dyre Oliver Dammann et al.
  • 1Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, Fairbanks, AK 99775, USA
  • 2Norwegian Geotechnical Institute, 0806 Oslo, Norway
  • 3College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, AK 99775, USA

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: open (until 22 Oct 2022)

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 reply

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.