Laser altimeter data obtained over sea-ice during the ARK-XIX/1 campaign in Mar-Apr, 2003; profile ARK-XIX-1_SBLA_20030325T1125_76.04_27.38_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the ARK-XIX/1 campaign in Mar-Apr, 2003 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by a Helicopter (RV-Polarstern Helicopter). 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 20030325T1125. 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]本数据集为2003年3-4月期间在ARK-XIX/1航次中获取的海冰表面粗糙度数据，所用设备为安装于电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter, SBLA），该系统由RV-Polarstern号直升机拖曳，飞行高度为海面上方10~30米。 研究采用Hibler（1972）提出的方法完成两项核心处理：一是从与载机运动相关的低频噪声中分离出海冰表面剖面，二是识别冰脊帆（pressure ridge sails）。相关处理流程详见https://epic.awi.de/id/eprint/56364/。 本次研究设置的冰脊检测阈值为0.6米，即仅能探测到高度不低于0.6米的冰脊帆。处理程序的名称与版本为：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）。 本数据集所用的SBLA记录设备为RIEGL LD90，采样率为100 Hz。该传感器的测量精度为5厘米，地表波束直径为5.8厘米。 本次特定数据集的获取时间为2003年3月25日11时25分（格式标识：20030325T1125）。数据集包含记录的高度计读数、反演得到的海面高程，以及探测到的冰脊帆的宽度、高度与间距。 数据质量备注：5.8厘米。 文件名命名规则：[DMS/PANGAEA航次标识] + [设备名称] + [日期/时间] + [经纬度] + [检测阈值] + [目标物类型] + [程序版本] + [文件格式]