Laser altimeter data obtained over sea-ice during the CASIMBO campaign in May, 2018; profile CAS2018_SBLA_20180506T1728_83.15_-106.01_thr06_data_Vers5

Sea ice surface roughness data were obtained during the CASIMBO campaign in May, 2018 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by an Airplane (Basler BT-67). 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 20180506T1728. 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]

本数据集的海冰表面粗糙度数据采集于2018年5月的CASIMBO科考航次，采用安装于电磁拖曳系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）进行采集，该系统由巴特勒BT-67型飞机拖曳，飞行高度为海面上方10至30米。研究采用Hibler于1972年提出的方法，完成两项核心处理：a）从与飞机运动相关的低频噪声中分离出地表剖面；b）识别冰压力脊帆。数据处理步骤详见https://epic.awi.de/id/eprint/56364/。本次研究设置的冰脊检测阈值为0.6米，即仅可识别高度大于0.6米的冰脊帆。数据处理程序的名称与版本为：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，源码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。本次采用的单波束激光高度计为RIEGL LD90型号，采样率为100赫兹，传感器测量精度为5厘米，地表激光光斑直径为5.8厘米。本数据集的具体采集时间为20180506T1728，包含记录的高度计读数、反演得到的地表高程，以及识别出的冰压力脊帆的宽度、高度与间距。数据质量说明：5.8厘米。文件名命名规则：[DMS/PANGAEA科考航次标识] + [设备名称] + [日期/时间] + [经纬度] + [检测阈值] + [目标物] + [版本号] + [文件格式]