TransCom 3: Seasonal CO2 Flux Estimates from Atmospheric Inversions (Level 2)

This data set provides model outputs and seasonal mean CO2 fluxes from the Atmospheric Carbon Cycle Inversion Intercomparison (TransCom 3), Level 2 inversion experiment. Inversion methods can be used to estimate surface CO2 fluxes from atmospheric CO2 concentration measurements, given an atmospheric transport model to relate the two. This Level 2 experiment inverted for the spatial and temporal pattern of the residual CO2 sources and sinks. There were 12 atmospheric tracer transport models utilized in this experiment. The data inverted were mean CO2 concentration data from 75 sites from the GLOBALVIEW-CO2 2000 data set for the period 1990-1996. The seasonal inversion consists of a 3 year forward simulation (365 days per year) containing 4 presubtracted tracers, 11 SF6 tracers, and 22 CO2 tracers (11 terrestrial, 11 oceanic) (Gurney et al., 2000). Carbon fluxes were estimated for each month of an average year determined as the mean of the 1992-1996 time period from an intercomparison of 12 different atmospheric tracer transport models. This data set provides input data, model output data,the cyclo inversion code, a basis function map, and estimated fluxes.本数据集提供了大气碳循环反演比对计划（TransCom 3）二级反演实验的模型输出结果与季节平均CO₂通量。反演方法可借助关联二者的大气输送模型，基于大气CO₂浓度观测数据估算地表CO₂通量。本次二级实验针对残余CO₂源汇的时空分布特征开展反演。 本次实验共采用12种大气示踪剂输送模型。反演所用数据为1990-1996年间GLOBALVIEW-CO2 2000数据集中75个观测站点的平均CO₂浓度数据。本次季节反演包含一次为期3年的正向模拟（每年365天），其中包含4种预减除示踪剂、11种SF₆示踪剂以及22种CO₂示踪剂（11种陆地源/汇，11种海洋源/汇）（Gurney等，2000）。基于12种不同大气示踪剂输送模型的比对结果，以1992-1996年的平均值作为基准年，对该基准年各月的碳通量进行了估算。 本数据集包含输入数据、模型输出数据、循环反演代码、基函数分布图以及估算得到的通量数据。