Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2005

• Main Authors: Hendricks, Stefan, Haas, Christian, Krumpen, Thomas
• Format: Dataset
• Language: English
• Published: PANGAEA
• Subjects: DATE/TIME; Event label; GreenICE2005; GreenICE2005_SBLA_20050506T204144; GreenICE2005_SBLA_20050506T210236; GreenICE2005_SBLA_20050511T154702; GreenICE2005_SBLA_20050511T160926; GreenICE2005_SBLA_20050511T163151; GreenICE2005_SBLA_20050511T171448; GreenICE2005_SBLA_20050512T203822; GreenICE2005_SBLA_20050512T205728; GreenICE2005_SBLA_20050512T211446; GreenICE2005_SBLA_20050513T160109; GreenICE2005_SBLA_20050513T162014; GreenICE2005_SBLA_20050513T163517; GreenICE2005_SBLA_20050513T171003; GreenICE2005_SBLA_20050513T173409; GreenICE2005_SBLA_20050514T171858; GreenICE2005_SBLA_20050514T174904; GreenICE2005_SBLA_20050514T180755; GreenICE2005_SBLA_20050514T183121; GreenICE2005_SBLA_20050514T185138; HEIGHT above ground; Helicopter; Laser Altimeter; LATITUDE; Lead event (true/false); LONGITUDE; POINT DISTANCE from start; Ridge boundary; left; right; Ridge Height; maximum; Ridge Spacing; typical; Ridge width; SBLA; Sea Ice Surface Roughness; Single beam laser altimeter; processed with laser_Altimeter_Processing_VS5_06_20.py; Surface elevation; Time in seconds; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.969266

Sea ice surface roughness data were obtained during the GreenIce campaign in May, 2005 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by a Helicopter (Unknown model). A method developed by Hibler (1972) was used to a) isolate the surface profile from low-frequency variations associated with the aircraft motion and b) to identify pressure ridge sails. The processing steps are described in https://epic.awi.de/id/eprint/56364/. We applied a ridge detection threshold of 0.6 m, which means that only sails higher 0.6 m are detected. Version and name of the processing routine: Laser_Altimeter_Processing_VS5_06_20.py (vers.5, Feb 22, 2024, https://gitlab.awi.de/sitem/sbla_processing.git). SBLA records (RIEGL - LD90) are provided at a sampling rate of 100 Hz. Sensor accuracy is 5 cm with a beam diameter at surface of 5.8 cm. This specific dataset was obtained on 20050514T2047. It includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 5.8 cm . File name: [DMS/PANGAEA Campaing Identifier] + [DEVICE] + [DATE/TIME] + [LAT/LON] + [Detection Threshold] + [Object] + [Version] + [Format]