Laser altimeter data obtained over sea-ice during the PS92 campaign in May-Jun, 2015; profile PS92_SBLA_20150608T0910_81.28_20.16_thr06_data_Vers5@en
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Sea ice surface roughness data were obtained during the PS92 campaign in May-Jun, 2015 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 20150608T0910. 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]
2015年5-6月的PS92科考航次中获取了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）。该系统由搭载于RV-极星号（RV-Polarstern）的直升机以10~30米的地表悬停高度拖曳作业。本研究采用Hibler于1972年提出的方法完成两项核心处理：a）从与直升机运动相关的低频波动中分离出地表剖面；b）识别海冰压力脊帆（pressure ridge sails）。数据处理的详细步骤详见https://epic.awi.de/id/eprint/56364/。本次研究设置的冰脊检测阈值为0.6米，即仅可识别高度高于0.6米的冰脊帆。数据处理程序的名称与版本信息为：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，源码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。本数据集所用的单波束激光高度计记录设备为RIEGL LD90型传感器，采样率为100Hz。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。本次特定数据集的获取时间为2015年6月8日09时10分（格式：20150608T0910）。数据集包含以下内容：记录的高度计读数、反演得到的地表高程，以及已识别冰脊帆的宽度、高度与间距。数据质量说明：5.8厘米。文件名命名规则为：[DMS/PANGAEA科考航次标识符] + [设备标识] + [日期/时间] + [经纬度] + [检测阈值] + [目标对象] + [版本号] + [文件格式]
