High resolution aircraft measurements of wind and temperature of the HALO-AC3 campaign in 2022 (100Hz)@en

During the HALO-AC3 campaign conducted in March and April 2022 in Svalbard meteorological data (temperature, 3 wind components, air pressure) have been measured in high temporal resolution (100 Hz) using instrumentation that was installed at the nosebooms of Polar 5 and Polar 6. For each flight the data are given as functions of time and position (including height above ground) along the flight tracks. All flights started and ended in Longyearbyen, Svalbard. Each file represents an entire flight starting well before the first movement of the plane and ending after the final parking position has been reached after landing. The wind measurement is only valid during flight and the full accuracy is only achieved during straight level flight sections. The absolute accuracy of the wind components is 0.5m/s for straight and level flights sections and the relative accuracy of the vertical wind speed is about 0.15m/s for straight and level flight sections. For these sections, which can be obtained on the basis of the given roll and pitch angles of the aircraft, the 100 Hz data can be used to derive turbulent fluxes of momentum and sensible heat. For further informations on the data processing and accuracy of the turbulence measurement refer to Hartmann et al. (2018, doi:10.5194/amt-11-4567-2018). On several occasions wind data are not available due to icing of the sensors. For those instances wind data are set to zero.2022年3月至4月于斯瓦尔巴群岛（Svalbard）开展的HALO-AC3科考航次中，研究人员依托搭载于Polar 5与Polar 6飞机鼻杆的观测仪器，以100 Hz的高时间分辨率获取了多类气象数据，涵盖气温、三维风场分量与大气压强。所有飞行任务均以斯瓦尔巴群岛的朗伊尔城（Longyearbyen）作为起降起点与终点。每个数据文件对应完整的单次飞行任务，其时间跨度覆盖飞机首次启动前至着陆后最终停放到位的全过程。风场测量数据仅在飞行阶段有效，且仅在平直水平飞行段可达到完整测量精度。在平直水平飞行段内，三维风场分量的绝对精度可达0.5 m/s，垂直风速的相对精度约为0.15 m/s。基于飞行器提供的滚转角与俯仰角，可筛选得到上述平直水平飞行段，利用该时段的100 Hz原始数据可推导得到动量与感热的湍流通量。如需了解数据处理流程与湍流测量精度的更多细节，请参考哈特曼等人（Hartmann et al.，2018年，doi:10.5194/amt-11-4567-2018）的研究成果。部分工况下，由于传感器积冰，风场数据将无法获取，此类情形下风场数据将被置零。