NUCAPS: NOAA Unique Combined Atmospheric Processing System Cloud-Cleared Radiances (CCR)

This dataset consists of Cloud-Cleared Radiances (CCRs) from the NOAA Unique Combined Atmospheric Processing System (NUCAPS). NUCAPS was developed by the NOAA/NESDIS Center for Satellite Application and Research (STAR) and is produced operationally at the NOAA/NESDIS Office of Satellite and Product Operations (OSPO). Cloud clearing is the process of computing the clear column radiance for each Cross-track Infrared Sounder (CrIS) channel. The CrIS sensor onboard the Suomi National Polar-orbiting Partnership (S-NPP) satellite is a Fourier transform spectrometer with a total of 1,305 spectral channels covering the longwave IR (9.14 - 15.38 um), midwave IR (5.71 - 8.26 um) and shortwave IR (3.92 - 4.64 um) wavelengths. CrIS scans at a 2200 km swath width, with each scan containing 30 Fields of Regard (FORs) viewed on the Earth's surface. Each FOR contains 9 Fields of View (FOVs) simultaneously measured as a 3 x 3 array. The circular FOVs have a diameter of 14 km at nadir. NUCAPS produces CCRs from the CrIS FORs that are co-located with the Advanced Technology Microwave Sounder (ATMS) also onboard the S-NPP satellite. The full spectrum CCRs are produced along with the standard NUCAPS Environmental Data Record (EDR) products, as the radiances are used to retrieve the EDR products. Each product file encompasses one 32-second granule of data, corresponding to 4 scan lines of CrIS/ATMS data. The products are distributed in netCDF-4 file format with metadata attributes included.

本数据集包含来自美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）统一联合大气处理系统（NOAA Unique Combined Atmospheric Processing System, NUCAPS）的晴空辐射量（Cloud-Cleared Radiances, CCRs）。NUCAPS由NOAA/NESDIS卫星应用与研究中心（Center for Satellite Application and Research, STAR）开发，并由NOAA/NESDIS卫星与产品业务办公室（Office of Satellite and Product Operations, OSPO）开展业务化生产。晴空清除（Cloud clearing）指针对每个跨轨红外探测器（Cross-track Infrared Sounder, CrIS）通道计算晴空柱辐射的过程。搭载于苏奥米国家极轨伙伴卫星（Suomi National Polar-orbiting Partnership, S-NPP）上的CrIS传感器是一台傅里叶变换光谱仪，共计1305个光谱通道，覆盖长波红外（9.14 - 15.38 μm）、中波红外（5.71 - 8.26 μm）与短波红外（3.92 - 4.64 μm）波段。CrIS的扫描幅宽为2200千米，每次扫描包含30个观测视场区域（Fields of Regard, FORs），可对地球表面进行观测。每个观测视场区域包含9个以3×3阵列同时测量的视场（Fields of View, FOVs），该圆形视场在星下点处的直径为14千米。NUCAPS从与同样搭载于S-NPP卫星上的先进技术微波探测器（Advanced Technology Microwave Sounder, ATMS）空间共位置的CrIS观测视场区域中生成晴空辐射量。完整光谱的晴空辐射量与标准NUCAPS环境数据记录（Environmental Data Record, EDR）产品同步生成，因为辐射量可用于反演环境数据记录产品。每个产品文件包含一段时长32秒的数据粒，对应4条CrIS/ATMS扫描线。该产品以netCDF-4文件格式分发，并附带元数据属性。