Agricultural Productivity Change for GCAM-USA

This dataset contains agricultural productivity change (APC) files generated using the Osiris R package (v1.0.4). These files represent climate-driven yield impacts applied to the GCAM-USA model for the IM3 project. The APC files were derived by processing gridded crop yield projections, using TGW-WRF climate data over the contiguous United States (CONUS) and ACCESS-ESM1-5 climate data for the rest of the world, along with atmospheric CO₂ concentrations and nitrogen application (fertilizer). Osiris aggregates these gridded yield outputs to GCAM basins and converts them into crop productivity multipliers for each GCAM commodity, irrigation type, and basin. These multipliers were used to modify baseline agricultural yield assumptions in GCAM-USA, enabling analysis of future climate impacts on the agricultural system. The data are formatted for direct use with GCAM’s AgProdChange XML inputs. These files were used in the IM3 canonical GCAM-USA scenario runs and are versioned for reproducibility. More details on the canonical GCAM-USA simulations can be found here: https://github.com/IMMM-SFA/canonical_gcam_runs/tree/main本数据集包含使用Osiris R包（v1.0.4）生成的农业生产力变化（Agricultural Productivity Change，以下简称APC）文件。此类文件代表为IM3项目适配至GCAM-USA模型的气候驱动型产量影响效应。APC文件的生成流程为：以美国本土（CONUS，全称contiguous United States）区域的TGW-WRF气候数据、全球其余区域的ACCESS-ESM1-5气候数据为基础，结合大气CO₂浓度与氮肥施用量，对网格化作物产量预测结果进行处理得到。 Osiris将上述网格化产量输出结果聚合至GCAM流域，并将其转换为针对各GCAM商品类别、灌溉类型及流域的作物生产力乘数。此类乘数被用于修正GCAM-USA模型的基准农业产量假设，以开展未来气候对农业系统影响的相关分析。本数据集的文件格式可直接适配GCAM的AgProdChange XML输入文件。 此类文件已应用于IM3标准GCAM-USA情景模拟，并带有版本信息以保证研究可复现。关于标准GCAM-USA模拟的更多细节可查阅：https://github.com/IMMM-SFA/canonical_gcam_runs/tree/main