NPP Multi-Biome: NPP and Driver Data for Ecosystem Model-Data Intercomparison

The Ecosystem Model-Data Intercomparison (EMDI), an on-going activity whose first workshop was held in Durham, New Hampshire, USA, in December 1999, provides the first opportunity for a wide range of global carbon cycle models to be compared with measured net primary productivity (NPP). The second EMDI workshop was held in April 2001 at the National Center for Ecological Analysis and Synthesis (NCEAS), Santa Barbara, California, U.S.A. EMDI is supported by GAIM (Global Analysis, Integration and Modelling), a component of the International Geosphere Biosphere Program (IGBP) of the International Council of Scientific Unions (ICSU). The goals of EMDI are to compare model estimates of terrestrial carbon fluxes (NPP) to estimates from ground-based measurements, and to improve understanding of environmental controls of carbon allocation. The primary questions to be addressed are to test simulated controls and model formulation on the water, carbon, and nutrient budgets with the observed NPP data providing the constraint for autotrophic fluxes and the integrity of scaled biophysical driving variables. EMDI - the NPP data from the NPP project forms the core data that was that was used in the EMDI Workshops (funded by GAIM and NCEAS). The workshop has resulted in a more NPP and model driver data being submitted to ORNL; in addition, the workshops provided a review of the data. NCEAS provided 6 months of time support for an intern at ORNL (Keri Johnson) to prepare data for the EMDI workshops.生态系统模型-数据比对计划（Ecosystem Model-Data Intercomparison, EMDI）是一项持续开展的工作，其首届研讨会于1999年12月在美国新罕布什尔州达勒姆举办。该计划为各类全球碳循环模型与实测净初级生产力（Net Primary Productivity, NPP）数据开展比对提供了首个契机。第二届EMDI研讨会于2001年4月在美国加利福尼亚州圣巴巴拉的国家生态分析与合成中心（National Center for Ecological Analysis and Synthesis, NCEAS）举办。EMDI由国际科学理事会（International Council of Scientific Unions, ICSU）下属的国际地圈生物圈计划（International Geosphere Biosphere Program, IGBP）的组成单元——全球分析、整合与建模计划（Global Analysis, Integration and Modelling, GAIM）提供资助。该计划的目标在于将陆地碳通量（以净初级生产力为核心指标）的模型估算结果与地面实测估算结果进行比对，并提升对碳分配过程环境调控机制的认知水平。本次计划亟待解答的核心问题为：以观测获取的净初级生产力数据作为自养通量的约束条件以及尺度化生物物理驱动变量的合理性依据，检验模拟调控机制与模型在水、碳及养分收支方面的构建合理性。EMDI的核心数据集源自净初级生产力项目产出的数据，该数据被应用于由GAIM与NCEAS资助的EMDI研讨会中。本次研讨会推动了更多净初级生产力与模型驱动数据提交至橡树岭国家实验室（Oak Ridge National Laboratory, ORNL）；此外，研讨会还对相关数据完成了评审工作。NCEAS为橡树岭国家实验室的实习生凯丽·约翰逊（Keri Johnson）提供了为期六个月的时间支持，用于其为EMDI研讨会筹备相关数据。