Application of Surface Spline Interpolation Method in Parameter Estimation of a PM_2.5 Transport Adjoint Model

Table 4

Error statistics of the practical experiment before and after assimilation.

Experiment	J300/	K (µg/m^3)		K (µg/m^3)		K(µg/m^3)		K
		Before	After	Before	After	Before	After	Before	After
SSI	2.80e-1	37.87	20.82	42.93	22.15	40.23	24.27	48.88%	37.27%
CI	3.04e-1	37.87	21.65	42.93	23.40	40.23	25.10	48.88%	36.29%

is the final value of cost function and J₁ is the initial value of cost function. K1 and K2 are the MAGEs between simulated values and observations in assimilated cities and checked cities, respectively. K3 and K4 are the MAGEs and MNGEs between the observations and simulated results in all the observation cities at the initial time.