Laser altimeter data obtained over sea-ice during the ARK-XI/1 campaign in Jul-Sep, 1995; profile ARK-XI-1_SBLA_19950819T1234_79.92_134.44_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the ARK-XI/1 campaign in Jul-Sep, 1995 with a Single Beam Laser Altimeter (SBLA) mounted on an/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 (IBEO - PS100E) are provided at a sampling rate of 200 Hz. Sensor accuracy is 3 cm with a beam diameter at surface of 11.4 cm. This specific dataset was obtained on 19950819T1234. It includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 11.4 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1995年7月至9月的ARK-XI/1科考航次，搭载于米里-8（Mil MI-8）型直升机的单波束激光高度计（Single Beam Laser Altimeter, SBLA）完成数据采集。研究采用Hibler（1972）提出的方法，完成两项核心处理：a）剥离与飞行器运动相关的低频分量，提取真实冰面剖面；b）识别海冰压力脊帆（pressure ridge sails）。处理流程详见https://epic.awi.de/id/eprint/56364/。 本次研究采用0.6米的脊帆检测阈值，即仅可识别高度不低于0.6米的海冰压力脊帆。处理程序版本与名称：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，开源仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。 本次采用的单波束激光高度计（SBLA）原始记录型号为IBEO-PS100E，数据采样率为200 Hz。该传感器的测量精度为3厘米，激光束在冰面的光斑直径为11.4厘米。本批次特定数据集的采集时间为1995年8月19日12时34分（标识为19950819T1234）。 该数据集包含原始高度计读数、反演得到的冰面高程数据，以及检测到的海冰压力脊帆的宽度、高度与间距信息。 数据质量说明：11.4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] + [目标物类型] + [版本号] + [文件格式]