Microwave Radiometer measurements of sky brightness temperature taken at Summit Station, Greenland, 2015

This dataset contains measurements of downwelling brightness temperature at 16 frequencies between 22.2 and 150 GHz at approximately 5 s temporal resolution. The observations were made by two radiometers (from Radiometer Physics GmbH) that are time-synced. This dataset contains only sky brightness temperatures; however, these data can be used to retrieve precipitable water vapor, cloud liquid water path, and profiles of temperature in the boundary layer. These radiometers periodically collect elevation scan data (horizon to horizon) that will be used to improve accuracy of the retrieved temperature profiles and to use for in-field calibrations (via tip-curve analysis). The radiometers are calibrated using liquid nitrogen approximately 4 times per year. The raw data are converted into netCDF format. The ICECAPS field operations at Summit are supported by the National Science Foundation's Arctic Observing Network (AON) Program.

本数据集包含22.2至150 GHz频段内16个频率点的下行亮度温度（downwelling brightness temperature）测量值，时间分辨率（temporal resolution）约为5秒。观测由两台时间同步的辐射计（radiometers）完成，设备由Radiometer Physics GmbH公司生产。本数据集仅涵盖天空亮度温度；然而，这些数据可用于反演可降水量（precipitable water vapor）、云液态水路径（cloud liquid water path）及边界层（boundary layer）温度廓线。上述辐射计定期采集仰角扫描数据（从地平线至地平线），此类数据将用于提升反演温度廓线的精度，并通过尖端曲线分析（tip-curve analysis）开展现场校准（in-field calibrations）。辐射计每年约采用液氮校准4次。原始数据已转换为netCDF格式。Summit站的ICECAPS野外作业由美国国家科学基金会（National Science Foundation）的北极观测网络（Arctic Observing Network, AON）项目支持。