Laser altimeter data obtained over sea-ice during the PAMARCMIP campaign in Mar-Apr, 2011; profile PAMARCMIP_2011_SBLA_20110415T1700_84.40_-64.82_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the PAMARCMIP campaign in Mar-Apr, 2011 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-5). 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 20110415T1700. 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2011年3至4月PAMARCMIP科考航次期间获取的海冰表面粗糙度数据，采用搭载于电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）采集，该系统由Basler BT-67（极地5号）飞机拖曳，飞行高度为海面上方10~30米。本次研究采用Hibler（1972）提出的处理方法，可实现两项核心功能：a）从与飞机运动相关的低频变化中分离出真实表面剖面；b）识别冰脊帆结构。详细处理步骤详见https://epic.awi.de/id/eprint/56364/。本次设置的冰脊检测阈值为0.6米，即仅能识别高度大于0.6米的冰脊帆。处理程序的名称与版本为：Laser_Altimeter_Processing_VS5_06_20.py（版本5，发布于2024年2月22日，代码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。本数据集的SBLA记录数据由RIEGL LD90型设备采集，采样率为100赫兹；传感器测量精度为5厘米，激光束在海面的光斑直径为5.8厘米。本数据集的获取时间为20110415T1700（对应2011年4月15日17时00分），包含记录的高度计读数、反演得到的海面高程，以及已识别冰脊帆的宽度、高度与间距。数据质量说明：光斑直径为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] + [目标物类型] + [版本号] + [文件格式]