Gridded Surface Albedo

Global digital databases of natural vegetation and land use were compiled, for use in climate studies, at 1 degree resolution from over 100 published sources. A series of 6 data sets, derived from the original compilations, was prepared and archived on tape at the National Center for Atmospheric Research (NCAR) (Matthews, 1984). The first is a vegetation data set representing natural (pre-agricultural) vegetation based on the UNESCO classification system. The second derived from the land-use compilation, is a cultivation-intensity data set defining the areal extent of presently-cultivated land in the 1 degree cells. The last four data sets which comprise this database are integrated surface-albedo data sets (January, April, July, October) for snow-free conditions, incorporating natural-vegetation and cultivation-intensity data sets. Each of these data sets covers the entire surface of the earth. They include non-zero data for permanent land only, including continental ice; water, including oceans and lakes, is zero.*Note: Gridded (1 degree x 1 degree) surface albedo values are expressed as a percentage.本数据集依托100余篇已发表文献，以1度空间分辨率构建了全球自然植被与土地利用数字数据库，用于气候相关研究。 基于原始整编成果衍生出的6组数据集已完成制备，并由美国国家大气研究中心（National Center for Atmospheric Research, NCAR）以磁带介质完成归档（Matthews, 1984）。 第一组为自然（农业开发前）植被数据集，采用联合国教科文组织（UNESCO）的分类体系进行表征。 第二组由土地利用汇编成果衍生而来，为耕作强度数据集，用于明确各1度网格单元内当前耕地的面积分布范围。 本数据库剩余的4组数据集为集成地表反照率数据集，涵盖1月、4月、7月、10月四个月份的无雪工况，融合了自然植被与耕作强度数据集的相关信息。 所有数据集均覆盖全球地表全域，仅针对永久性陆地（包括大陆冰盖）存储非零数值；水体（涵盖海洋与湖泊）的数值均设为零。 *注：网格化（1度×1度）地表反照率数值以百分比形式表示。