NOAA Climate Data Record (CDR) of Reflectance and Brightness Temperatures from AVHRR Pathfinder Atmospheres - Extended (PATMOS-x), Version 5.3 (Version Superseded)

*Note: This dataset version has been superseded by a newer version.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.* This NOAA Climate Data Record (CDR) of AVHRR reflectance and brightness temperatures was produced by the University of Wisconsin using the AVHRR Pathfinder Atmospheres - Extended (PATMOS-X) Version 5.3 processing system. The CDR spans from 1979 to the present with daily, global coverage generated from between two and ten NOAA and MetOp satellite passes per day. The source AVHRR data points, with a sensor resolution of 1.09 km near nadir, have been fitted to a 0.1 x 0.1 degree equal-angle grid in ascending and descending files. The calibrated reflectance channels in the visible spectrum (0.63, 0.86, and 1.6 microns) portion of the record were delivered as a CDR in Version 5.2 in 2010. This updated Version 5.3 extends the product to include brightness temperatures from the 3.75, 11 and 12 micron channels, as well as a suite of cloud products (the PATMOS-x Cloud Properties CDR). Version 5.3 also extends the period of record through the present and applies the newest calibration coefficients. In total, there are seven (7) AVHRR channel variables. Not counting the coordinate variables, there are 48 data and ancillary data variables in the netCDF data file to facilitate proper data usage. The file format was converted from HDF to netCDF-4 with metadata following the Climate and Forecast (CF) Conventions and Attribute Convention for Dataset Discovery (ACDD). The dataset is accompanied by algorithm documentation, data flow diagram and source code for the NOAA CDR Program.

*注意：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，仅可在特殊场景下使用本版本，例如复现使用该版本开展的研究工作。
本数据集为美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）气候数据记录（Climate Data Record, CDR）系列中的高级甚高分辨率辐射计（Advanced Very High Resolution Radiometer, AVHRR）反射率与亮温数据集，由威斯康星大学采用AVHRR探路大气扩展版（PATMOS-X）5.3版处理系统生成。该CDR的时间跨度为1979年至今，提供每日全球覆盖数据，数据源自每日2至10次NOAA与MetOp卫星的过境观测。
原始AVHRR数据点的星下点传感器分辨率为1.09千米，已被重采样至0.1°×0.1°的等角网格，并分为升轨与降轨文件存储。该数据集中可见光波段（0.63、0.86及1.6微米）的定标反射率通道数据，已于2010年以5.2版CDR的形式发布。
本次更新的5.3版扩展了产品范围，新增了3.75、11及12微米波段的亮温通道数据，同时集成了一系列云产品（即PATMOS-x云属性CDR）。5.3版还将数据记录的时间跨度延伸至当前，并采用了最新的定标系数。
该数据集中共包含7个AVHRR通道变量。若不计坐标变量，netCDF数据文件中共有48个数据变量与辅助数据变量，以保障数据的正确使用。该数据集的文件格式已从HDF转换为netCDF-4，其元数据遵循《气候与预报约定（Climate and Forecast Conventions, CF）》与《数据集发现属性约定（Attribute Convention for Dataset Discovery, ACDD）》。
本数据集配套提供了NOAA CDR项目的算法文档、数据流图与源代码。