Laser altimeter data obtained over sea-ice during the TIFAX campaign in Jul-Aug, 2016; profile TIFAX_2016_SBLA_20160726T1205_85.15_-50.02_thr06_data_Vers5@en

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 20160726T1205. 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月的TIFAX科考航次，所用设备为安装于电磁系统（EM-Bird）内部的单波束激光高度计（Single Beam Laser Altimeter，SBLA），该系统由巴特勒BT-67（Polar-6）飞机拖曳，飞行高度为海面上方10至30米。本次数据处理采用Hibler（1972）提出的方法，实现两项核心功能：a）分离受飞机运动引发的低频干扰后的海面剖面；b）识别海冰压力脊帆体。详细处理步骤可参见https://epic.awi.de/id/eprint/56364/。本次研究设置的冰脊检测阈值为0.6米，即仅能识别高度大于0.6米的冰脊帆体。处理程序的名称与版本信息为：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）。本次使用的SBLA设备型号为RIEGL LD90，采样率为100赫兹。该传感器的测量精度为5厘米，海面处激光束直径为5.8厘米。本数据集的具体采集时间为20160726T1205（即2016年7月26日12时05分）。数据集包含记录的高度计原始读数、反演得到的海面高程，以及检测得到的冰脊帆体的宽度、高度与间距。数据质量说明：5.8厘米。文件名命名规则为：[DMS/PANGAEA 考察任务标识符] + [设备标识] + [采集日期/时间] + [经纬度] + [检测阈值] + [目标物类型] + [程序版本] + [文件格式]