Microwave brightness temperature measurements during the HAMAG airborne campaign

The published data set consists of measurements performed by the passive sub-millimeter radiometer as part of the Microwave Radar and radiometer for Arctic Clouds (MiRAC; Mech et al., 2019) operated on board the Polar 6 research aircraft during six research flights during the HAMAG (Humidity profiles and Arctic Mixed-phase clouds as seen by Airborne W- and G-band radars) campaign, carried out in February 2024 in Kiruna. The measurement campaign is embedded in the Transregional Collaborative Research Centre TR 172 (ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms (AC)3. The published data set comprises brightness temperature measurements taken at nadir view with respect to the aircraft's fuselage at six frequencies in the water vapor absorption band, centered at approximately 183.31 GHz, and two additional channels at 243 and 340 GHz. The brightness temperatures have not been corrected for aircraft attitude. The dataset has been quality-checked and is available in NetCDF format for each flight. Details on the instrument can be found in Mech et al. (2019).

本公开数据集由搭载于极地6号（Polar 6）科研飞机的无源亚毫米波辐射计（passive sub-millimeter radiometer）所采集的测量数据构成，该辐射计是北极云微波雷达与辐射计（Microwave Radar and radiometer for Arctic Clouds，MiRAC）系统的组成部分（Mech等，2019）。相关数据采集于2024年2月在基律纳开展的HAMAG科考航次期间，该航次全称为"机载W波段与G波段雷达观测的湿度廓线及北极混合相云（Humidity profiles and Arctic Mixed-phase clouds as seen by Airborne W- and G-band radars，HAMAG）"，共完成6架次科研飞行。本次科考航次隶属于跨区域合作研究中心TR 172项目——"北极放大效应：与气候相关的大气与地表过程及反馈机制（ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms，AC)3"。本公开数据集包含以天底视角（相对于飞机机身）采集的亮温测量数据，涵盖位于水汽吸收带内的6个观测频率（中心频率约为183.31 GHz），以及2个额外观测通道（频率分别为243 GHz与340 GHz）。所有亮温数据均未针对飞机飞行姿态进行校正。本数据集已完成质量检查，每份航次数据均以NetCDF格式提供，仪器的详细信息可参考Mech等人（2019）的研究成果。