Laser altimeter data obtained over sea-ice during the PS92 campaign in May-Jun, 2015; profile PS92_SBLA_20150608T0508_81.11_16.71_thr06_data_Vers5

Sea ice surface roughness data were obtained during the PS92 campaign in May-Jun, 2015 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 (RV-Polarstern Helicopter). 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 20150608T0508. 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]本数据集为2015年5-6月PS92科考航次期间获取的海冰表面粗糙度数据，采用安装于电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）采集；该电磁系统由RV-Polarstern号直升机拖曳，作业高度为海面上方10~30米。本研究采用Hibler（1972）提出的方法完成两项处理：a）分离受飞行器运动影响的低频变化对应的表面剖面；b）识别压力脊帆（pressure ridge sails）。数据处理步骤详见https://epic.awi.de/id/eprint/56364/。本次研究采用0.6米的冰脊检测阈值，即仅可检测到高度大于0.6米的冰脊帆体。处理程序的版本与名称为：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，https://gitlab.awi.de/sitem/sbla_processing.git）。单波束激光高度计记录设备型号为RIEGL LD90，采样率为100 Hz。该传感器的精度为5厘米，地表激光束直径为5.8厘米。本特定数据集的获取时间为20150608T0508（即2015年6月8日05时08分）。数据集包含记录的高度计读数、反演得到的表面高程，以及检测到的压力脊帆体的宽度、高度与间距。数据质量说明：激光束地表直径为5.8厘米。文件名命名规则：[DMS/PANGAEA科考航次标识符] + [设备标识] + [日期/时间] + [经纬度] + [检测阈值] + [目标物] + [版本] + [文件格式]