ISLSCP II IGBP NPP Output from Terrestrial Biogeochemistry Models

This data set contains modeled annual net primary production (NPP) for the land biosphere from seventeen different global models. Annual NPP is defined as the net difference of annual carbon uptake (grams CO2/m2/yr) from the atmosphere through photosynthesis by the land vegetation and that lost back to the atmosphere through autotrophic and maintenance respiration. NPP is also related to the Net Ecosystem Exchange (NEE) of carbon accumulated by or lost from the surface by its vegetation and soils. NPP is NEE plus heterotrophic (decomposition) respiration of the vegetation and soils. Only NPP values are included in this data set as some models did not estimate NEE. Data for the mean, standard deviation and coefficient of variation of NPP for the 17 models are provided at spatial resolutions of 1.0 degree and 0.5 degrees. There are two compressed (*.zip) data files with this data set.

本数据集包含来自17个不同全球模型的陆地生物圈年净初级生产力（annual net primary production，缩写NPP）模拟数据。年净初级生产力的定义为：陆地植被通过光合作用从大气中摄取的年度碳吸收量（单位：克二氧化碳/平方米/年），与陆地植被和土壤通过自养呼吸及维持呼吸向大气排放的碳量之间的净差值。净初级生产力还与植被及土壤在地表积累或流失的碳的净生态系统交换（Net Ecosystem Exchange，缩写NEE）相关，即净初级生产力等于净生态系统交换加上植被与土壤的异养（分解）呼吸量。由于部分模型未估算净生态系统交换，本数据集仅收录净初级生产力数据。数据集提供了17个模型的净初级生产力的均值、标准差和变异系数数据，空间分辨率分别为1.0度与0.5度。本数据集附带两个压缩（*.zip）数据文件。