CLARA-A1: CM SAF cLouds, Albedo and Radiation Dataset from AVHRR data - Edition 1 - Monthly Means / Daily Means / Pentad Means / Monthly Histograms

The CLARA-A1 dataset is a global dataset of cloud, surface albedo and surface radiation products derived from measurements of the Advanced Very High Resolution Radiometer (AVHRR) onboard the polar orbiting NOAA and Metop satellites. Monthly and daily mean products have been compiled over a time period of 28 years starting in 1982 and ending in 2009. Results are available for individual satellites as well as aggregated for all satellites. Results are provided on two types of grids: one global regular latitude-longitude grid with 0.25 degrees resolution and two equal-area grids covering the polar regions with 25 km resolution (products on the polar grids are restricted to cloud amount and surface albedo). Further extensions, e.g. single- and multi-parameter histograms, and subsets, e.g. daytime-only and night-time only results, are also included. Products covered by this are: Cloud Fraction, Joint Cloud Histogram, Cloud Top Products, Cloud Optical Thickness, Cloud Phase, Liquid Water Path, Ice Water Path, Surface Incoming Shortwave Radiation, Surface Albedo, Surface Net Shortwave Radiation, Surface Outgoing Longwave Radiation, Surface Downward Longwave Radiation, Surface Net Longwave Radiation, Surface Radiation Budget, Cloud Radiative Effect Shortwave, Cloud Radiative Effect Longwave. This is a Thematic Climate Data Record (TCDR). The assigned DOI for this dataset is: 10.5676/EUM_SAF_CM/CLARA_AVHRR/V001. An updated version of the TCDR is available. Users are recommended to use edition 2 of this TCDR (CLARA-2.1, EO:EUM:DAT:0338) .CLARA-A1数据集是一套全球数据集，涵盖云、地表反照率（surface albedo）及地表辐射相关产品，其数据源自极轨NOAA卫星与Metop卫星搭载的先进甚高分辨率辐射计（Advanced Very High Resolution Radiometer, AVHRR）的观测结果。该数据集涵盖1982年至2009年共28年的观测时段，已整编得到日均与月均产品。数据结果可按单颗卫星单独输出，也可基于所有卫星进行聚合后获取。数据采用两类网格格式存储：其一为分辨率0.25度的全球常规经纬网格；其二为两套分辨率25公里的极地区域等面积网格（极地区域网格仅提供云量与地表反照率产品）。此外，数据集还包含单参数、多参数直方图等衍生产品，以及仅日间、仅夜间等数据子集。本数据集覆盖的产品包括：云分数（Cloud Fraction）、联合云直方图（Joint Cloud Histogram）、云顶产品（Cloud Top Products）、云光学厚度（Cloud Optical Thickness）、云相态（Cloud Phase）、液态水路径（Liquid Water Path）、冰水路径（Ice Water Path）、地表入射短波辐射（Surface Incoming Shortwave Radiation）、地表反照率、地表净短波辐射（Surface Net Shortwave Radiation）、地表出射长波辐射（Surface Outgoing Longwave Radiation）、地表下行长波辐射（Surface Downward Longwave Radiation）、地表净长波辐射（Surface Net Longwave Radiation）、地表辐射收支（Surface Radiation Budget）、短波云辐射效应（Cloud Radiative Effect Shortwave）、长波云辐射效应（Cloud Radiative Effect Longwave）。本数据集属于专题气候数据记录（Thematic Climate Data Record, TCDR）。该数据集的指定DOI为：10.5676/EUM_SAF_CM/CLARA_AVHRR/V001。目前该专题气候数据记录已有更新版本，推荐用户使用该TCDR的第2版（CLARA-2.1，EO:EUM:DAT:0338）。