Laser altimeter data obtained over sea-ice during the CASIMBO campaign in May, 2018; profile CAS2018_SBLA_20180503T1751_86.31_-80.43_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 20180503T1751. 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，由搭载在Basler BT-67型飞机于海面上方10~30米高度拖曳的电磁系统（EM-Bird）内部的单波束激光高度计（Single Beam Laser Altimeter，SBLA）完成采集。本次数据处理采用Hibler（1972）提出的方法，实现两项核心功能：a） 剥离与飞机运动相关的低频噪声，提取真实海冰表面轮廓；b） 识别冰面压力脊帆（pressure ridge sails）。数据处理的详细步骤可参考链接https://epic.awi.de/id/eprint/56364/。本次设置的脊帆检测阈值为0.6米，即仅能识别高度高于0.6米的冰脊帆。本次数据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，源码仓库链接：https://gitlab.awi.de/sitem/sbla_processing.git）。单波束激光高度计（SBLA）的原始记录设备为RIEGL LD90型传感器，采样率设置为100 Hz。该传感器的测量精度为5厘米，地表激光光斑直径为5.8厘米。本数据集的采集时间为2018年5月3日17时51分（时间戳格式：20180503T1751）。数据集包含原始高度计读数、反演得到的海冰表面高程，以及已识别的冰脊帆的宽度、高度与间距信息。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] + [采集日期/时间] + [经纬度] + [检测阈值] + [目标对象] + [版本号] + [文件格式]