NACP North American 8-km Net Ecosystem Exchange and Component Fluxes, 2004

This data set provides modeled carbon flux estimates at 8-km spatial resolution over North America for the year 2004 of (1) net ecosystem exchange (NEE) of carbon dioxide (CO2), (2) net ecosystem production (NEP, the balance of net primary production and heterotrophic respiration), (3) stream evasion (CO2 emitted from streams and rivers), (4) emissions from harvested forest and agricultural products, and (5) emissions from biomass burning.Annual estimates, in g C/m2/year, are provided for all five fluxes. Daily estimates, in g C/m2/day, are provided for NEP and stream evasion fluxes. Fluxes for fire emissions, harvest decomposition/respiration, stream evasion, and NEP were derived as described in Section 5.NEE fluxes were estimated using a full bottom-up accounting of NEE produced by integrating emissions from harvested forest and agricultural products, CO2 emitted from streams and rivers, and biomass burning in the CarbonTracker (version 2011_oi) modeling system. NEE estimates were run in the forward mode through the CarbonTracker inversion setup that calculates CO2 uptake and release at the Earth's surface over time. Refer to Turner et al.(2013) for details.There are seven data files in NetCDF (.nc) format with this data set, including: five annual files for fire emissions, harvest decomposition/respiration, stream evasion, NEP, and NEE fluxes; and two daily files for NEP and stream evasion fluxes.

本数据集提供了北美地区2004年8公里空间分辨率的模式化碳通量估算，包括：(1)二氧化碳（CO2）的净生态系统交换（NEE），(2)净生态系统生产（NEP，包括净初级生产与异养呼吸的平衡），(3)溪流逃逸（来自溪流和河流排放的CO2），(4)采伐森林和农产品排放，以及(5)生物质燃烧排放。所有五个通量的年度估算值以g C/m2/year为单位提供。净生态系统生产（NEP）和溪流逃逸通量的每日估算值以g C/m2/day为单位提供。火灾排放、采伐分解/呼吸、溪流逃逸和NEP的通量根据第5节所述的方法推导。NEE通量估算采用CarbonTracker（2011_oi版本）模拟系统中整合的采伐森林和农产品排放、溪流和河流排放的CO2以及生物质燃烧的全面自下而上核算。NEE估算通过CarbonTracker反演设置中的正向模式运行，该设置计算地球表面随时间变化的CO2吸收和释放。有关详细信息，请参阅Turner等人（2013年的研究）。本数据集包含七个NetCDF（.nc）格式的数据文件，包括：五个年度文件，分别针对火灾排放、采伐分解/呼吸、溪流逃逸、NEP和NEE通量；以及两个每日文件，分别针对NEP和溪流逃逸通量。