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Evaluation of horizontal advection in the x direction with the DADJ (discrete adjoint) against the CVM (complex variable method) sensitivities of the final concentrations of an accumulation-mode aerosol species ASO4J (μgm−3) with respect to the initial ASO4J (μgm−3) from a 1d test run. For the tile plots, the x and y axes represent the horizontal y direction and the vertical layers, respectively. The perturbation size for the CVM is 1.E-12.
