NOAA Climate Data Record (CDR) of Intersatellite Calibrated Clear-Sky High Resolution Infrared Radiation Sounder (HIRS) Channel 12 Brightness Temperature Version 3 (Version Superseded)

*Note: This dataset version has been superseded by a newer version. It is highly recommended that users access the current version. Users should only use this version for special cases, such as reproducing studies that used this version.* The High-Resolution Infrared Radiation Sounder (HIRS) of intersatellite calibrated channel 12 brightness temperature (TB) product is a gridded global monthly time series product spanning from 1979 to the most current full year, updated monthly. Among the twenty channels in the HIRS instrument, channel 12 measures upper tropospheric water vapor (UTWV). Multiple polar orbiting satellites in the NOAA Polar-orbiting Operational Environmental Satellite (POES) series and MetOp-A have carried HIRS instruments. Due to the independence in calibration of the individual HIRS instruments, biases exist between satellites. Examination of the intersatellite biases shows that the biases are scene brightness temperature dependent. These HIRS channel 12 measurements from the NOAA POES and MetOp-A are calibrated to a baseline satellite based on intersatellite bias correction data. The differences from the last version include that the dataset is now provided as monthly mean 2.5x2.5 degree latitude/longitude in netcdf format. This CDR is key to understanding water vapor feedback climatology and has been used to study long-term water vapor variability, to evaluate climate models, and to study large-scale atmospheric circulations.

*注：本数据集版本已被更新版本取代，强烈建议用户使用当前最新版本。仅当需要复现使用本版本开展的研究时，方可使用此旧版数据集。 高分辨率红外辐射探测仪（High-Resolution Infrared Radiation Sounder, HIRS）的星间校准第12通道亮温（brightness temperature, TB）产品是一套网格化全球逐月时间序列数据集，时间跨度为1979年至最新完整年份，每月更新一次。HIRS仪器共设20个探测通道，其中第12通道用于观测对流层上层水汽（upper tropospheric water vapor, UTWV）。美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）极轨业务环境卫星（Polar-orbiting Operational Environmental Satellite, POES）系列以及MetOp-A的多颗极轨卫星均搭载了HIRS仪器。由于各HIRS仪器的校准流程相互独立，不同卫星间存在系统偏差。对星间偏差的分析显示，偏差值与场景亮温存在相关性。研究团队基于星间偏差校正数据，将NOAA POES系列与MetOp-A卫星获取的HIRS第12通道观测数据校准至基准卫星。本版数据集相较于旧版的更新内容为：以2.5°×2.5°经纬度网格的月均值形式提供数据，格式为NetCDF。该气候数据记录（Climate Data Record, CDR）是解析水汽反馈气候学特征的关键数据集，已被应用于长期水汽变异性研究、气候模型评估以及大尺度大气环流研究。