Airborne sea ice parameters during aircraft flight P6_217_ICEBIRD_2019_1904020901, Version 2@en

Airborne multi-instrument measurements of sea ice were made in April 2019 during the winter campaign of the AWI IceBird campaign series. The data consist of five surveys spanning sea-ice covered areas in the Lincoln Sea, Central Arctic Ocean, as well as the Beaufort Sea. For each flight, the geolocated total (ice+snow) thickness data from an airborne electromagnetic (EM) induction sensor are provided with a point spacing of approximately 5-6 meters. Larger gaps in the trajectories arise from high-altitude calibrations of the EM sensor. The data are combined with collocated and simultaneous snow depth measurements from an airborne frequency-modulated continuous-wave ultrawideband radar, snow freeboard measurements from an airborne near-infrared laser scanner, and surface temperature measurements from an airborne infrared radiation pyrometer. Each value represents the average within the approximately 40 m diameter footprint of the EM sensor, thus representing a smoothed representation. These values are then used to derive further sea ice parameters such as sea ice bulk density. The trajectory data contain the full and unfiltered data record with quality flags.2019年4月，依托AWI IceBird系列科考冬季航次开展了海冰机载多仪器观测实验。本次数据集包含5次航次的观测数据，覆盖区域涵盖林肯海、北冰洋中部以及波弗特海的海冰覆盖海域。针对每一次飞行任务，本数据集提供了机载电磁感应传感器（airborne electromagnetic (EM) induction sensor）获取的经地理定位的总厚度（海冰+积雪）数据，数据点间距约为5至6米，轨迹中存在的较大间隙源于电磁传感器的高空校准作业。该数据集还结合了同步配套的多类观测数据：机载调频连续波超宽带雷达（frequency-modulated continuous-wave ultrawideband radar）获取的积雪厚度数据、机载近红外激光扫描仪获取的雪面干舷（snow freeboard）数据，以及机载红外辐射高温计（infrared radiation pyrometer）获取的表面温度数据。每个数据值对应电磁传感器约40米直径观测覆盖足迹（footprint）内的平均观测结果，因此呈现为经过平滑处理的数值。基于上述数据可进一步推导得到海冰体密度等其他海冰相关参数。轨迹数据包含完整未经过滤的原始观测记录，并附带质量标记（quality flags）。