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Evaluation of vertical diffusion with the ADJ (adjoint) against the FDM (finite-difference method) from a 1d test run: (a) sensitivities of the final ozone (ppmV) with respect to the initial ozone (ppmV) with a 1ppb perturbation size for the FDM; (b) sensitivities of the final nitrogen dioxide (ppmV) with respect to the initial nitrogen dioxide emissions (mols−1) with a perturbation size of 0.1mols−1. The values in (b) are multiplied by 105.
