Airborne low-altitude snow depth on sea ice during aircraft flight P5_205_PAMARCMIP_2017_1704102101, Version 1@en

Airborne observations of snow depth on sea ice were made in March and April 2017 as part of the Polar Airborne Measurements and Arctic Regional Climate Model Simulation Project (PAMARCMIP) under the AWI IceBird campaign series. The data consist of six surveys spanning sea-ice covered areas in the Lincoln Sea, Central Arctic Ocean, as well as the Beaufort and Chukchi Seas. For each flight, the geolocated snow depth data from an airborne frequency-modulated continuous-wave ultrawideband radar using an algorithm based on signal peakiness are provided with a point spacing of approximately 4-5 meters. The trajectory data contain the full and unfiltered data record with quality flags. Longer sections of altitude-flagged data arise from calibrations of an EM sensor. Each snow depth value represents the average depth within the radar footprint that has a theoretical smooth surface cross-/along-track diameter of 2.6/1.0 m.2017年3—4月，作为极地机载测量与北极区域气候模式模拟项目（Polar Airborne Measurements and Arctic Regional Climate Model Simulation Project，PAMARCMIP）的组成部分，研究团队在AWI IceBird航次系列中开展了海冰积雪厚度机载观测。本次数据集包含6次科考航次的观测数据，覆盖区域涵盖林肯海、北冰洋中部海域以及波弗特海与楚科奇海的海冰覆盖区。针对每一次飞行任务，数据集均提供基于信号峰值度算法的机载调频连续波超宽带雷达（frequency-modulated continuous-wave ultrawideband radar）获取的地理定位积雪厚度数据，测点间距约为4~5米。轨迹数据包含完整未经过滤的原始记录，并附带质量标记（quality flags）。部分较长的带高度标记的数据区段，源自电磁传感器（EM sensor）的校准工作。每个积雪厚度数值均代表雷达波束覆盖区（radar footprint）内的平均积雪厚度，该波束在理想光滑表面下的横向与沿轨直径分别为2.6米与1.0米。