Laser altimeter data obtained over sea-ice during the ARK-XXVI/3 campaign in Aug-Sep, 2011; profile ARK-XXVI-3_SBLA_20110816T0752_86.16_59.68_thr06_data_Vers5

Sea ice surface roughness data were obtained during the ARK-XXVI/3 campaign in Aug-Sep, 2011 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 20110816T0752. 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2011年8-9月ARK-XXVI/3科考航次期间获取的海冰表面粗糙度数据，采集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），该系统由RV-Polarstern号直升机以距地表10~30米的高度拖曳作业。
本研究采用Hibler（1972）提出的处理方法，完成两项核心任务：a）从与直升机运动相关的低频噪声中分离出表面剖面；b）识别海冰冰脊帆（pressure ridge sails）。数据处理步骤详见https://epic.awi.de/id/eprint/56364/。
本次冰脊检测采用0.6米的阈值，即仅可识别高度大于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SBLA设备型号为RIEGL LD90，采样率为100 Hz。传感器精度为5厘米，地表波束直径为5.8厘米。
本数据集的采集时间为20110816T0752（2011年8月16日07时52分），包含记录的高度计读数、反演得到的地表高程，以及检测到的冰脊帆的宽度、高度与间距。
数据质量说明：地表波束直径为5.8厘米。
文件名命名规则：由[DMS/PANGAEA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]及[文件格式]拼接组合而成。