The VT is the time until a net emission signal begins to outstrip its underlying uncertainty. For a number of reasons, namely (i) data availability, (ii) consistency in accounting net carbon fluxes, and (iii) spatio-temporal conditions, which correspond to the current level of sophistication realized in the approach, the VT concept was applied to the global scale. However, the temporal verification conditions of the approach correspond to those on sub-global scales, in accordance with the Protocol.
The two issues examined here are: (1) how to utilize the characterization of changes in global net carbon emissions by uncertainty distributions for the description of VTs on a probabilistic basis; and (2) whether probabilistically and deterministically determined VTs differ.
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