Laser altimeter data obtained over sea-ice during the ARK-XXII/2 campaign in Aug-Sep, 2007; profile ARK-XXII-2_SBLA_20070909T1017_84.84_-159.62_thr06_data_Vers5@en
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Sea ice surface roughness data were obtained during the ARK-XXII/2 campaign in Aug-Sep, 2007 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 20070909T1017. 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]
本数据集的海冰表面粗糙度数据采集于2007年8-9月的ARK-XXII/2科考航次，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）完成采集，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）提出的方法开展两项处理：a）从与直升机运动相关的低频信号中分离出海冰表面剖面；b）识别压力冰脊帆体。具体处理步骤详见https://epic.awi.de/id/eprint/56364/。本次研究设置的冰脊检测阈值为0.6米，即仅能识别高度大于0.6米的压力冰脊帆体。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，源码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。单波束激光高度计（SBLA）的原始记录由RIEGL LD90设备采集，采样率为100 Hz。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。本次数据集的采集时间为20070909T1017，对应2007年9月9日10时17分。数据集包含记录的高度计读数、反演得到的海冰表面高程，以及识别出的压力冰脊帆体的宽度、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] + [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]
