![]() Routine assessment of the global carbon cycle is required to monitor the ongoing increases in atmospheric CO 2 concentrations, evaluate the causes and drivers of this trend, and quantify the impact of policies that aim to stabilise and reverse it 3, 4, 5. It will be updated annually and made available for atmospheric inversions contributing to GCP global carbon budget assessments, thus aligning the prior constraints on top-down fossil CO 2 emissions with the bottom-up estimates compiled by the GCP.įossil fuel use, cement production and land-use change have perturbed the natural carbon cycle and increased the concentration of carbon dioxide (CO 2) in the Earth’s atmosphere by almost 50% since 1750, from 277 ppm in 1750 to 407 ppm in 2018 1, 2, 3. GCP-GridFED also includes gridded estimates of O 2 uptake based on oxidative ratios for oil, coal and natural gas. Estimates are provided separately for oil, coal and natural gas, for mixed international bunker fuels, and for the calcination of limestone during cement production. GCP-GridFEDv2019.1 provides monthly fossil CO 2 emissions estimates for the period 1959–2018 at a spatial resolution of 0.1°. Here we describe GCP-GridFED (version 2019.1), a gridded fossil emissions dataset that is consistent with the national CO 2 emissions reported by the Global Carbon Project (GCP). They require prior constraints fossil CO 2 emissions. Atmospheric inversion models disaggregate observed variations in atmospheric CO 2 concentration to variability in CO 2 emissions and sinks. Quantification of CO 2 fluxes at the Earth’s surface is required to evaluate the causes and drivers of observed increases in atmospheric CO 2 concentrations.
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