Wave acquisition stereo-camera system measurements (WASS) from a voyage of the S.A. Agulhas II, July 2017
Between 07:00 and 08:00 UTC on the 4th July 2017, the South African icebreaker S.A. Agulhas II entered the Antarctic MIZ (62 South and 30 East) during an explosive polar cyclone. A system of two GigE monochrome industrial CMOS cameras with a 2/3 inch sensor was installed on the icebreaker. The camer...
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| Format: | Dataset |
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Australian Ocean Data Network
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| Online Access: | https://researchdata.edu.au/wave-acquisition-stereo-july-2017/1698279 https://data.aad.gov.au/metadata/records/AAS_4434_AGULHAS_WASS_2017 https://data.aad.gov.au/eds/5241/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4434 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4434_AGULHAS_WASS_2017 |
| Summary: | Between 07:00 and 08:00 UTC on the 4th July 2017, the South African icebreaker S.A. Agulhas II entered the Antarctic MIZ (62 South and 30 East) during an explosive polar cyclone. A system of two GigE monochrome industrial CMOS cameras with a 2/3 inch sensor was installed on the icebreaker. The cameras provide a field of view of the ocean surface around the port side of the ship. Images were recorded with resolution 2448x2048 pixels and a sampling rate 2 Hz during daylight on the 4th July 2017. The wave acquisition stereo-camera system (WASS; https://www.dais.unive.it/wass/) is used to reconstruct the water surface elevation. Reconstructed surface elevations are given as .nc files (6). The file name is “wass__20170704_hhmm.nc” where hh and mm denote the hour and minute in UTC of the start of each acquisition. X_grid and Y_grid are the grid in x and y direction, resolution 1000mm or 1m. Fps is the acquisition frequency, resolution 2Hz. Time is a dummy variable, time is reconstructed from start time and fps. Z is the surface elevation in space and time, in mm. Missing values are "Nan". Other variables are WASS control variables. Further details on the measurements and use of the data can be found at Alberello et al. “An extreme wave field in the winter Antarctic marginal ice zone during an explosive polar cyclone”. Despite major advances over the past decade in measuring wave propagation through the MIZ, there is a lack of measurements in the harsh winter Antarctic MIZ and for the extreme wave conditions in the winter Southern Ocean, where the mean significant wave height in many sectors reaches 5 m and the 90th percentiles (extremes) are up to 7 m. Stereo-imaging techniques have emerged as a tool for in-situ wave measurements in the MIZ. The images are used to reconstruct the sea surface elevation in time and space, thus enabling analysis of wave dynamics in both two-dimensional physical space and the frequency-direction spectral domain, including statistical analysis of the wave field. The measurements have implications for the treatment of wave–ice interactions in wave and sea ice forecasting models. |
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