Microwave Radiometer measurements of sky brightness temperature taken at Summit Station, Greenland, 2024

### Access
Files can be accessed and downloaded from the directory via: [https://arcticdata.io/data/10.18739/A27940W8G/](https://arcticdata.io/data/10.18739/A27940W8G/).

### Overview
This dataset contains measurements of downwelling brightness temperature at 16 frequencies between 22.2 and 150 GHz (gigahertz) at approximately 5 s (second) 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.

### 数据访问
数据集文件可通过以下目录链接访问并下载：[https://arcticdata.io/data/10.18739/A27940W8G/](https://arcticdata.io/data/10.18739/A27940W8G/)。

### 数据集概览
本数据集包含22.2至150吉赫（GHz）频段内共16个频率的下行亮温观测数据，时间分辨率约为5秒。观测由两台时间同步的辐射计完成，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，但可用于反演可降水量、云液水路径以及边界层温度廓线。该辐射计会定期采集全地平线范围的仰角扫描数据，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开展现场校准工作。该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。格陵兰萨米特（Summit）站的ICECAPS野外实验由美国国家科学基金会北极观测网（AON）项目资助。