SiB4 Modeled Global 0.5-Degree Monthly Carbon Fluxes and Pools, 2000-2018

This dataset provides global monthly output predicted by the Simple Biosphere Model, Version 4.2 (SiB4), at a 0.5-degree spatial resolution covering the time period 2000 through 2018. SiB4 is a mechanistic land surface model that integrates heterogeneous land cover, environmentally responsive phenology, dynamic carbon allocation, and cascading carbon pools from live biomass to surface litter to soil organic matter. Monthly output includes carbon, carbonyl sulfide (COS), and energy fluxes; solar-induced fluorescence (SIF); carbon pools; soil moisture and temperatures in the top three layers; total column soil water and plant available water; and environmental potentials used to scale photosynthesis. The SiB4 output is per plant functional type (PFT) within each 0.5-degree grid cell. SiB4 partitions variable output to 15 PFTs in each grid cell that are indexed by the "npft" dimension (01-15) in each data file. The PFT three-character abbreviations ("pft_names" variable) are listed in the same order as the "npft" dimension. To combine the PFT-specific output into grid cell totals, users must compute the area-weighted mean across the vector of PFT-specific values for each cell. Fractional areal coverages are given in the "pft_area" variable for each cell.

本数据集提供了全球月度输出，由版本 4.2 的简单生物圈模型（SiB4）预测，空间分辨率为 0.5 度，涵盖了 2000 年至 2018 年的时间段。SiB4 是一种机制性的陆地表面模型，该模型综合了异质土地覆盖、环境响应的物候、动态碳分配以及从活生物量到地表凋落物再到土壤有机质的碳库级联。月度输出包括碳、羰基硫化物（COS）和能量通量；太阳诱导荧光（SIF）；碳库；表层土壤的前三个土层的土壤水分和温度；总柱土壤水分和植物可用水；以及用于缩放光合作用的生态环境潜力。SiB4 的输出是针对每个 0.5 度网格单元内的植物功能类型（PFT）。SiB4 将每个网格单元中的变量输出分为 15 个 PFT，这些 PFT 由每个数据文件中的 "npft" 维度（01-15）索引。PFT 的三位缩写（"pft_names" 变量）按照与 "npft" 维度相同的顺序列出。为了将特定于 PFT 的输出合并为网格单元总计，用户必须计算每个单元格中特定于 PFT 的值向量上的面积加权平均值。每个单元格的分数面积覆盖率由 "pft_area" 变量给出。