Aircraft measurements of wind and temperature during flight P6_231_HALO_2022_2203280801 of the HALO-AC3 campaign in 2022

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). The current dataset represents a downsampled version of 100Hz data to 1Hz by a moving average filter. 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（Svalbard）开展的HALO-AC3科考任务中，研究人员借助安装于Polar 5与Polar 6机鼻吊杆（noseboom）上的观测设备，以高时间分辨率（100 Hz）采集了气象数据，包括气温、三维风分量与大气压强。本次任务中，所有飞行航次的观测数据均以沿飞行轨迹的时间与位置（含离地高度）函数形式给出，且所有航次均在斯瓦尔巴的朗伊尔城（Longyearbyen）起降。每个数据文件对应一次完整的飞行过程，涵盖飞机首次移动前至着陆后抵达最终停机位的全时段数据。
风场测量仅在飞行过程中有效，且仅在平直平飞阶段可达到完整标称精度。平直平飞阶段下，三维风分量的绝对精度为0.5 m/s，垂直风速的相对精度约为0.15 m/s。
可通过飞行器的滚转角（roll）与俯仰角（pitch）识别此类平直平飞阶段，此时100 Hz的原始数据可用于推导动量与感热湍流通量。有关数据处理与湍流测量精度的详细信息，请参考Hartmann等人（2018年，doi:10.5194/amt-11-4567-2018）的研究成果。
本数据集为原始100 Hz数据经滑动平均滤波器降采样至1 Hz后的版本。部分情况下，由于传感器积冰，风场数据将无法获取，此时此类风场数据将被置零。