Aircraft measurements of wind and temperature during flight P6_231_HALO_2022_2204051301 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月于斯瓦尔巴群岛（Svalbard）开展的HALO-AC3科考航次中，研究人员借助搭载于Polar 5与Polar 6飞机机头探头杆（nosebooms）上的观测设备，以100Hz的高时间分辨率采集了气象数据，涵盖温度、3个风分量与大气气压。各次飞行的数据均以沿飞行轨迹的时间与位置（含离地高度）的函数形式呈现。所有飞行任务均以斯瓦尔巴群岛的朗伊尔城（Longyearbyen）为起降起点与终点。每个数据文件对应一次完整飞行，覆盖时段从飞机首次启动移动前直至着陆后抵达最终停放位置。风场测量仅在飞行过程中有效，且仅在平直平飞航段方可达到完整测量精度。平直平飞航段下，风分量的绝对精度为0.5m/s，垂直风速的相对精度约为0.15m/s。可通过飞机提供的滚转与俯仰姿态角识别出此类航段，该类航段的100Hz原始数据可用于推导动量与感热湍流通量。如需了解数据处理流程与湍流测量精度的更多细节，请参阅Hartmann等人（2018，doi:10.5194/amt-11-4567-2018）的相关研究。本数据集为将原始100Hz数据通过移动平均滤波器降采样至1Hz后的版本。多次出现因传感器积冰导致风数据缺失的情况，此类场景下风数据被置零。