First observations of sea ice flexural–gravity waves with ground-based radar interferometry in Utqiaġvik, Alaska

Autor: D. O. Dammann, M. A. Johnson, A. R. Mahoney, E. R. Fedders
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: The Cryosphere, Vol 17, Pp 1609-1622 (2023)
Druh dokumentu: article
ISSN: 1609-2023
1994-0416
1994-0424
12392758
DOI: 10.5194/tc-17-1609-2023
Popis: 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 April 2021. Individual 30 s 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.
Databáze: Directory of Open Access Journals
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