Laser altimeter data obtained over sea-ice during the ARK-XIX/1 campaign in Mar-Apr, 2003; profile ARK-XIX-1_SBLA_20030404T1335_81.62_10.72_thr06_data_Vers5

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 20030404T1335. 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ARK-XIX/1科考航次中获取的海冰表面粗糙度数据。实验采用安装于电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）进行数据采集，该系统由“极星号”科考直升机（RV-Polarstern Helicopter）拖曳，飞行高度为海面上方10至30米。本研究采用Hibler于1972年提出的处理方法，完成两项核心任务：a）从与载机运动相关的低频噪声中分离出海冰表面剖面；b）识别海冰冰脊帆（pressure ridge sails）。数据处理的详细步骤详见https://epic.awi.de/id/eprint/56364/。本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米的冰脊帆。数据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）。本次采集所用的SBLA记录设备型号为RIEGL LD90，采样率为100赫兹。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。本特定数据集的获取时间为2003年4月4日13时35分（时间戳格式：20030404T1335）。数据集包含记录的高度计原始读数、反演得到的海冰表面高程，以及已识别冰脊帆的宽度、高度与间距。数据质量备注：5.8厘米。文件名命名规则为：[DMS/PANGAEA航次标识符] + [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]。