Laser altimeter data obtained over sea-ice during the IceBird Summer campaign in Jul-Aug, 2018; profile P6_211_ASIMBO_2018_SBLA_20180812T1115_83.57_6.76_thr06_data_Vers5@en
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Sea ice surface roughness data were obtained during the IceBird Summer campaign in Jul-Aug, 2018 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by an Airplane (Basler BT-67, Polar-6). 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 (ASTECH - LDM) are provided at a sampling rate of 100 Hz. Sensor accuracy is 2 cm with a beam diameter at surface of 6.3 cm. This specific dataset was obtained on 20180812T1115. It includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 6.3 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2018年7-8月的IceBird夏季科考航次，搭载于航空电磁系统（electromagnetic system, EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter, SBLA）被挂载于Basler BT-67型“极地6号”飞机下方，在距海冰表面10至30米高度处进行拖曳观测。研究采用Hibler（1972）提出的方法完成两项核心处理：a）从与飞机运动相关的低频噪声中分离出表面剖面；b）识别冰脊帆（pressure ridge sails）。具体处理流程详见https://epic.awi.de/id/eprint/56364/。本次数据处理采用0.6米的冰脊检测阈值，即仅能识别高度大于0.6米的冰脊帆。处理程序版本与名称：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，获取地址：https://gitlab.awi.de/sitem/sbla_processing.git）。单波束激光高度计记录数据（ASTECH-LDM）的采样率为100赫兹。传感器精度为2厘米，地表激光束光斑直径为6.3厘米。本数据集的具体采集时间为2018年8月12日11时15分（标识为20180812T1115）。数据集包含记录的高度计读数、反演得到的表面高程，以及已识别冰脊帆的宽度、高度与间距信息。数据质量说明：6.3厘米。文件名命名规则：[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]
