CM SAF Cloud Fractional Cover dataset from Meteosat First and Second Generation - Edition 2 (COMET Ed. 2)

This Climate Data Record (CDR) provides cloud fractional cover (CFC) derived from the Meteosat Visible and InfraRed Imager (MVIRI) on board the Meteosat First Generation (MFG) and the Spinning Enhanced Visible and InfraRed Imager (SEVIRI) onboard the Meteosat Second Generation (MSG) satellites. The covered time period ranges from January 1983 to December 2020. Original thermal radiances were inter-calibrated by the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT). The Meteosat CFC is presented as hourly, daily and monthly composites on a 0.05°x0.05° grid covering the Meteosat disk (Africa and Europe). The CFC data is derived from two Meteosat heritage channels by use of an advanced Bayesian retrieval algorithm. It employs continuous cloud scores, which are built on a contemporaneous clear sky background inversion. The Meteosat CFC is characterized by comparability to the SYNOP-based long-term CFC observations carried out at WMO ground stations. The Meteosat CFC is therefore useful to supplement the ground-based CFC estimates in areas with low station density or high spatio-temporal CFC variability. This is a Thematic Climate Data Record (TCDR).本数据集为气候数据记录（Climate Data Record, CDR），提供基于第一代静止气象卫星（Meteosat First Generation, MFG）搭载的气象卫星可见红外成像仪（Meteosat Visible and InfraRed Imager, MVIRI），以及第二代静止气象卫星（Meteosat Second Generation, MSG）搭载的增强型旋转可见红外成像仪（Spinning Enhanced Visible and InfraRed Imager, SEVIRI）反演得到的云分数覆盖率（Cloud Fractional Cover, CFC）数据。其覆盖时段为1983年1月至2020年12月。原始热辐射数据已由欧洲气象卫星开发组织（European Organisation for the Exploitation of Meteorological Satellites, EUMETSAT）完成交叉定标。该静止气象卫星云分数覆盖率数据以小时、日、月合成产品形式发布，采用0.05°×0.05°的网格分辨率，覆盖静止气象卫星观测视场（涵盖非洲与欧洲区域）。云分数覆盖率数据通过先进贝叶斯反演算法（Bayesian retrieval algorithm），利用静止气象卫星系列沿用的两个观测通道反演得到，该算法采用基于同期晴空背景反演得到的连续云量评分。本数据集的云分数覆盖率数据可与世界气象组织（World Meteorological Organization, WMO）地面站点基于地面气象观测规范（SYNOP）获取的长期云分数覆盖率观测数据具备良好可比性。因此，其可用于补充站点密度较低或云分数覆盖率时空变异性较高区域的地面云分数覆盖率估算结果。本数据集属于专题气候数据记录（Thematic Climate Data Record, TCDR）。