Laser altimeter data obtained over sea-ice during the Transdrift-XIII campaign in Apr-May, 2008; profile Transdrift-XIII_SBLA_20080414T0641_74.74_129.41_thr06_data_Vers5

• Main Authors: Krumpen, Thomas, Haas, Christian, Hendricks, Stefan
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: DATE/TIME; 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; Transdrift-XIII; Transdrift-XIII_SBLA_20080414T064009; Arctic; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.971099; https://doi.org/10.1594/PANGAEA.971099

Sea ice surface roughness data were obtained during the Transdrift-XIII campaign in Apr-May, 2008 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 (Mil MI-8). 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 20080414T0641. 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]