Microwave Radiometer measurements of sky brightness temperature taken at Summit Station, Greenland, 2010

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个频率的下行亮温（downwelling brightness temperature）测量数据，时间分辨率约为5秒。该观测由两台时间同步的辐射计（radiometer）完成，设备来自辐射计物理有限公司（Radiometer Physics GmbH）。本数据集仅包含天空亮温数据，但该类数据可用于反演可降水量（precipitable water vapor）、云液水路径（cloud liquid water path）以及边界层温度廓线。这些辐射计会定期采集仰角扫描数据（扫描范围覆盖从一个地平线至另一个地平线），该数据可用于提升反演温度廓线的精度，也可用于野外校准（借助尖端曲线分析（tip-curve analysis））。这些辐射计每年约使用液氮开展4次校准工作。原始数据已转换为netCDF格式。位于萨米特（Summit）的ICECAPS野外观测任务由美国国家科学基金会北极观测网络（Arctic Observing Network, AON）项目资助。