Microwave Radiometer measurements of sky brightness temperature taken at Summit Station, Greenland, 2012

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 GHz至150 GHz频段内16个频率下的下行亮温测量数据，时间分辨率约为5秒。观测由两台来自Radiometer Physics GmbH的时间同步辐射计完成。本数据集仅包含天空亮温数据，但可用于反演可降水量、云液态水路径以及边界层温度廓线。两台辐射计会定期采集仰角扫描数据（覆盖地平线至地平线全范围），此类数据可用于提升反演温度廓线的精度，同时可通过尖端曲线分析（tip-curve analysis）开展野外校准。两台辐射计每年约使用液氮进行4次校准。原始数据已转换为netCDF格式。位于萨米特（Summit）的ICECAPS野外作业得到了美国国家科学基金会北极观测网络（Arctic Observing Network, AON）计划的支持。