Laser altimeter data obtained over sea-ice during the IceBird Summer campaign in Aug, 2023; profile P5_242_IceBird_Summer_2023_SBLA_20230805T1446_83.41_-15.13_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the IceBird Summer campaign in Aug, 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-5). 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) 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 20230805T1446. 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8月开展的IceBird夏季科考任务。数据采集所用的单波束激光高度计（Single Beam Laser Altimeter，SBLA）搭载于电磁系统（EM-Bird）内，该系统由巴斯勒BT-67型极地5号（Basler BT-67, Polar-5）飞机拖曳，飞行高度距海冰表面10至30米。本次研究采用Hibler（1972）提出的处理方法，完成两项核心任务：一是从与飞机运动相关的低频噪声中分离出冰面剖面；二是识别海冰压脊帆（pressure ridge sails）。详细处理步骤可参见文献：https://epic.awi.de/id/eprint/56364/。本次研究设置的冰脊检测阈值为0.6米，即仅可识别高度高于0.6米的冰压脊帆。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，代码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。SBLA记录数据（ASTECH - LDM）的采样率为100赫兹，传感器测量精度为2厘米，海冰表面的激光光斑直径为6.3厘米。本数据集的采集时间为20230805T1446（即2023年8月5日14时46分）。数据集包含以下内容：记录的高度计读数、反演得到的冰面高程，以及已识别冰压脊帆的宽度、高度与间距。数据质量说明：6.3厘米。文件名命名规则为：[DMS/PANGAEA科考任务标识符] + [设备名称] + [采集日期/时间] + [经纬度] + [检测阈值] + [目标物类型] + [处理版本] + [文件格式]。