Laser altimeter data obtained over sea-ice during the ARK-XX/2 campaign in Jul-Aug, 2004; profile ARK-XX-2_SBLA_20040728T1012_83.00_1.44_thr06_data_Vers5

Sea ice surface roughness data were obtained during the ARK-XX/2 campaign in Jul-Aug, 2004 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 20040728T1012. 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]本数据集为海冰表面粗糙度数据，采集于2004年7-8月的ARK-XX/2科考航次。数据采集采用安装于航空电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA），该系统由“极星号”科考直升机（RV-Polarstern Helicopter）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处理任务：a）从与飞行器运动相关的低频噪声中分离出海冰表面剖面；b）识别冰脊帆体（pressure ridge sails）。数据处理的详细步骤可参见https://epic.awi.de/id/eprint/56364/。本次处理采用0.6米的冰脊检测阈值，即仅可检测出高度不低于0.6米的冰脊帆体。 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，https://gitlab.awi.de/sitem/sbla_processing.git）。 本数据集使用的单波束激光高度计型号为RIEGL LD90，其记录数据的采样率为100 Hz。该传感器的测量精度为5厘米，激光束在海面的光斑直径为5.8厘米。 本特定数据集的采集时间为2004年7月28日10时12分（20040728T1012），包含记录的高度计读数、反演得到的海面高程，以及检测到的冰脊帆体的宽度、高度与间距。 数据质量备注：5.8厘米。 文件名命名规则：文件名由[DMS/PANGAEA科考航次标识符] + [设备名称] + [日期/时间] + [经纬度] + [检测阈值] + [目标物] + [版本号] + [文件格式]拼接而成。