Infrared Atmospheric Sounding Interferometer (IASI) Level 2 Outgoing Longwave Radiation (OLR)

Infrared Atmospheric Sounding Interferometer (IASI), is a hyperspectral infrared sounder residing on the European Space Agency's (ESA) MetOp series of polar orbiting satellites. The main goal is to provide atmospheric emission spectra to derive temperature and humidity profiles with high vertical resolution and accuracy. It is a Michelson interferometer with spectral coverage between 3.6 and 15.5 micrometers. At nadir, the instrument samples data at intervals of 25 km along and a cross track, each sample having a maximum diameter of about 12 km. Currently the IASI level 2 products from MetOp-2 satellite include temperature and humidity profiles with a vertical accuracies of 1 degree Kelvin and 10% per 1-km layer respectively, trace gases, and the cloud cleared radiances (CCR) on a global scale and these products are available to the operational user community. This dataset contains information about the outgoing longwave radiation AIP. The IASI Level 2 and cloud-cleared radiances (CCR) files are NOAA-unique retrieval products generated from the EUMETSAT IASI level 1C data, the NOAA Level 1B Advanced Microwave Sounding Unit-A (AMSU-A) data, and the NOAA Level 1B Microwave Humidity Sounder (MHS) data.

红外大气探测干涉仪（Infrared Atmospheric Sounding Interferometer, IASI）是搭载于欧洲空间局（European Space Agency, ESA）MetOp系列极轨卫星的高光谱红外探测载荷。其核心目标为获取大气发射光谱，以反演具备高垂直分辨率与高精度的温湿度廓线。该仪器为迈克尔逊干涉仪，光谱覆盖范围介于3.6至15.5微米之间。在天底观测模式下，仪器沿轨与跨轨方向的采样间隔均为25千米，单个采样点的最大直径约为12千米。目前，来自MetOp-2卫星的IASI二级产品涵盖了垂直精度分别为1开尔文与每1千米层10%的温湿度廓线、痕量气体，以及全球尺度的晴空辐射率（Cloud Cleared Radiances, CCR），上述产品已面向业务用户群体开放共享。本数据集包含向外长波辐射AIP相关信息。IASI二级产品与晴空辐射率（CCR）文件为美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）独有的反演产品，其数据源涵盖欧洲气象卫星应用组织（EUMETSAT）的IASI一级C类数据、NOAA一级B类先进微波探测单元-A（Advanced Microwave Sounding Unit-A, AMSU-A）数据，以及NOAA一级B类微波湿度探测器（Microwave Humidity Sounder, MHS）数据。