Laser altimeter data obtained over sea-ice during the IceBird Winter campaign in Mar-Apr, 2023; profile P6_239_IceBird_Winter_2023_SBLA_20230331T1642_70.69_-133.42_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the IceBird Winter campaign in Mar-Apr, 2023 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 (ASTECH - LDM/RIEGL VQ560) are provided at a sampling rate of 100 Hz. Sensor accuracy is 2 cm with a beam diameter at surface of 6.3 cm. This specific dataset was obtained on 20230331T1642. It includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 6.3 cm . File name: [DMS/PANGAEA Campaing Identifier] + [DEVICE] + [DATE/TIME] + [LAT/LON] + [Detection Threshold] + [Object] + [Version] + [Format]本数据集为海冰表面粗糙度数据，采集于2023年3-4月开展的IceBird冬季科考航次（IceBird Winter campaign）。数据采集时，单波束激光高度计（Single Beam Laser Altimeter, SBLA）搭载于电磁系统（electromagnetic system, EM-Bird）内部，该系统由Basler BT-67型飞机（极地6号，Polar-6）拖曳，飞行高度为海面上方10-30米。 本研究采用Hibler（1972）提出的方法完成两项处理任务：a）从与飞行器运动相关的低频信号中分离出海冰表面剖面；b）识别海冰压力脊帆（pressure ridge sails）。具体处理流程详见https://epic.awi.de/id/eprint/56364/。 本次研究设置的冰脊检测阈值为0.6米，即仅可识别高度≥0.6米的压力脊帆。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，获取地址：https://gitlab.awi.de/sitem/sbla_processing.git）。 单波束激光高度计（SBLA）的记录数据（型号为ASTECH - LDM/RIEGL VQ560）采样率为100 Hz；传感器精度为2厘米，地表激光束直径为6.3厘米。 本数据集的采集时间为2023年3月31日16时42分（格式标识：20230331T1642）。数据集包含记录的高度计读数、反演得到的海冰表面高程，以及已识别的压力脊帆的宽度、高度与间距。 数据质量说明：6.3厘米。 文件名命名规则：[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]