Laser altimeter data obtained over sea-ice during the IceBird Summer campaign in Aug, 2021; profile P6_226_ICEBIRD_2021_SBLA_20210824T1152_83.74_-54.99_thr06_data_Vers5

Sea ice surface roughness data were obtained during the IceBird Summer campaign in Aug, 2021 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 20210824T1152. 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]

海冰表面粗糙度数据采集自2021年8月开展的IceBird夏季考察活动，采用搭载于电磁系统（electromagnetic system, EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter, SBLA）获取，该系统由巴斯拉BT-67型飞机（极地6号）以距海面10至30米的高度拖曳。本研究采用希勒（Hibler，1972）提出的方法完成两项核心处理：a）从与飞行器运动相关的低频波动中分离出海冰表面剖面；b）识别海冰压力脊帆（pressure ridge sails）。处理流程详见https://epic.awi.de/id/eprint/56364/。本次设置的冰脊检测阈值为0.6米，即仅可检测到高度大于0.6米的冰脊帆。处理程序的版本与名称：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，https://gitlab.awi.de/sitem/sbla_processing.git）。单波束激光高度计记录（ASTECH - LDM）的采样率为100赫兹。传感器精度为2厘米，地表波束直径为6.3厘米。本数据集的采集时间为20210824T1152（即2021年8月24日11时52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，以及已检测海冰压力脊帆的宽度、高度与间距。数据质量说明：6.3厘米。文件名命名规则：[DMS/PANGAEA科考活动标识符] + [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]