Global Soil Organic Carbon Estimates in topsoil (30 arcsec), Mar. 2012

Global estimates of soil organic carbon stocks have been produced in the past to support the calculation of potential emissions of CO2 from the soil under scenarios of change land use/cover and climatic conditions (IPCC, 2006), but very few global estimates are presented as spatial data. For global spatial layers on soil parameters, the most recent and complete dataset is available as the Harmonized World Soil Database (HWSD). The HWSD represents a step forward towards a spatially more detailed and thematically more refined set of global soil data. This dataset contains the organic carbon density (t ha-1) for the topsoil (30 - 100cm) from the amended HWSD. The original delivery from JRC consisted of two files in IDRISI Raster format, each covering half of the globe. For convenience, these files have been merged at EEA into a single GeoTIFF file covering the whole globe. The original files are in the zip archive HWSDa_OC_Dens_30SEC.zip This metadata record is adapted from the orginal one received from JRC.过往已有研究生成全球土壤有机碳储量估算结果，用于支持土地利用/覆被变化与气候情景下土壤CO₂潜在排放量的计算（政府间气候变化专门委员会（Intergovernmental Panel on Climate Change, IPCC），2006），但目前以空间数据形式呈现的全球估算结果寥寥无几。针对土壤参数的全球空间图层而言，当前最新且最完整的数据集为《世界土壤数据库协调版》（Harmonized World Soil Database, HWSD）。HWSD在空间细节与专题精细度上均实现了全球土壤数据集的迭代升级。 本数据集包含经修正后的HWSD中30~100cm深度表层土壤的有机碳密度（单位：吨每公顷，t·ha⁻¹）。 欧盟联合研究中心（Joint Research Centre, JRC）最初交付的数据包含两份IDRISI栅格格式文件，每份覆盖全球一半区域。为便于使用，欧洲环境署（European Environment Agency, EEA）已将这两份文件合并为一份覆盖全球的GeoTIFF格式文件。原始文件存储于压缩归档HWSDa_OC_Dens_30SEC.zip中。 本元数据记录改编自欧盟联合研究中心（JRC）提供的原始元数据文档。