Laser altimeter data obtained over sea-ice during the ARK-XII campaign in Jul-Sep, 1996; profile ARK-XII_SBLA_19960820T1122_82.43_132.05_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the ARK-XII campaign in Jul-Sep, 1996 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 19960820T1122. 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]本数据集的海冰表面粗糙度数据采集于1996年7至9月的ARK-XII科考航次，由搭载于米里-8（Mil MI-8）直升机的单波束激光高度计（Single Beam Laser Altimeter, SBLA）完成采集。 研究采用Hibler（1972）提出的处理方法，实现两项核心任务：a）分离受飞行器运动影响的低频信号，提取真实海冰表面剖面；b）识别压力冰脊帆体（pressure ridge sails）。相关处理步骤详见链接：https://epic.awi.de/id/eprint/56364/。 本次处理设置的冰脊检测阈值为0.6米，即仅可识别高度不低于0.6米的冰脊帆体。所用处理程序的版本与名称为：Laser_Altimeter_Processing_VS5_06_20.py（版本5，发布于2024年2月22日，代码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。 SBLA的原始观测记录（型号IBEO - PS100E）以200 Hz的采样率进行存储。该传感器的测量精度为3 cm，地表激光光斑直径为11.4 cm。 本特定数据集的采集时间为1996年8月20日11时22分（标识为19960820T1122）。数据集包含以下内容：记录的高度计读数、衍生得到的海冰表面高程数据，以及检测得到的压力冰脊帆体的宽度、高度与间距。 数据质量说明：地表激光光斑直径为11.4 cm。 文件名命名规则为：[DMS/PANGAEA科考航次标识] + [设备名称] + [日期/时间] + [经纬度] + [检测阈值] + [目标对象] + [版本号] + [文件格式]