(a) The given source and sink terms
(b) The inversion result of the given source and sink terms obtained by CFD with a 48 hours’ time step size
(c) The inversion result of the given source and sink terms obtained by CDS with a 24 hours’ time step size
Figure 9: Figures of the source and sink terms inverted by the adjoint method of data assimilation with CFD and CDS.