Laser altimeter data obtained over sea-ice during the TIFAX campaign in Jul-Aug, 2016; profile TIFAX_2016_SBLA_20160731T1516_86.69_-20.50_thr06_data_Vers5

Sea ice surface roughness data were obtained during the TIFAX campaign in Jul-Aug, 2016 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, Polar-6). 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 20160731T1516. 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]

海冰表面粗糙度数据采集于2016年7—8月开展的TIFAX科考航次，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）进行采集；该系统由巴特勒BT-67型极地6号飞机（Basler BT-67, Polar-6）拖曳，飞行高度为海面上方10~30米。研究采用Hibler（1972）提出的方法完成两项核心处理：a）从与飞行器运动相关的低频波动中分离出表面剖面，b）识别冰脊帆结构。详细处理步骤可参考https://epic.awi.de/id/eprint/56364/。本次处理设置的冰脊检测阈值为0.6米，即仅可检测到高度不低于0.6米的冰脊帆结构。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，代码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。本数据集配套的单波束激光高度计（SBLA）记录设备为RIEGL LD90，采样率为100 Hz。该传感器的测量精度为5厘米，地表光束直径为5.8厘米。本数据集的采集时间为20160731T1516，包含记录的高度计读数、推导得到的表面高程，以及检测到的冰脊帆的宽度、高度与间距。数据质量说明：5.8厘米。文件命名规则为：[DMS/PANGAEA科考航次标识符] + [设备名称] + [日期/时间] + [经纬度] + [检测阈值] + [目标对象] + [版本号] + [文件格式]。