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The TOPSIS technique takes the weights assigned by the entropy technique as input. Then ranks were assigned to each GCM according to TOPSIS metric values, and these metrics were determined by comparing simulated monthly rainfall data of 21 GCMs with observed monthly data of Surat City corresponding to the period 1969–2005. Table 2 displays the rankings given to 21 GCMs. TOPSIS metric values for the top five ranks are 0.986, 0.936, 0.910, 0.863, and 0.843, respectively. As a result, simulations of the top five GCMs are employed in the further analysis.

Table 2

Values of performance indicators, TOPSIS metric values, and ranks of 21 GCMs

Sr. NO.	GCM Name	CC	NRMSD	ANMBD	NSE	TOPSIS METRIC	RANK
1	NorESM1-M	0.43	2.11	1.05	0.29	0.986	1
2	bcc-csm1-1	0.53	1.82	0.90	0.23	0.936	2
3	CNRM-CM5	0.50	1.95	0.98	0.21	0.910	3
4	MIROC-ESM	0.50	1.83	0.88	0.16	0.863	4
5	GFDL-CM3	0.44	2.03	0.94	0.14	0.843	5
6	IPSL-CMSA-LR	0.50	1.88	0.95	0.14	0.841	6
7	MIROC-ECM-CHEM	0.56	1.72	0.86	0.12	0.823	7
8	MIROC5	0.48	1.98	0.98	0.11	0.810	8
9	MPI-ESM-MR	0.59	1.66	0.84	0.08	0.781	9
10	GFDL-ESM2G	0.43	2.15	1.06	0.08	0.774	10
11	Can-ESM2	0.47	1.97	1.01	0.07	0.772	11
12	ACCESS1-0	0.57	1.96	1.02	0.06	0.754	12
13	CESM1-BGC	0.52	1.99	1.01	0.04	0.737	13
14	MPI-ESM-LR	0.52	1.83	0.88	0.02	0.715	14
15	inmcm4	0.39	2.27	1.16	−0.15	0.533	15
16	CCSM4	0.45	1.99	1.00	−0.18	0.506	16
17	BNU-ESM	0.47	1.99	1.03	−0.24	0.443	17
18	GFDL-ESM2M	0.45	2.07	1.03	−0.24	0.439	18
19	IPSL-CMSA-MR	0.45	1.99	0.99	−0.25	0.431	19
20	CSIRO-Mk3-′6-0	0.35	2.45	1.13	−0.90	0.165	20
21	MRI-CGCM3	0.43	2.19	1.01	−0.66	0.008	21

Sr. NO.	GCM Name	CC	NRMSD	ANMBD	NSE	TOPSIS METRIC	RANK
1	NorESM1-M	0.43	2.11	1.05	0.29	0.986	1
2	bcc-csm1-1	0.53	1.82	0.90	0.23	0.936	2
3	CNRM-CM5	0.50	1.95	0.98	0.21	0.910	3
4	MIROC-ESM	0.50	1.83	0.88	0.16	0.863	4
5	GFDL-CM3	0.44	2.03	0.94	0.14	0.843	5
6	IPSL-CMSA-LR	0.50	1.88	0.95	0.14	0.841	6
7	MIROC-ECM-CHEM	0.56	1.72	0.86	0.12	0.823	7
8	MIROC5	0.48	1.98	0.98	0.11	0.810	8
9	MPI-ESM-MR	0.59	1.66	0.84	0.08	0.781	9
10	GFDL-ESM2G	0.43	2.15	1.06	0.08	0.774	10
11	Can-ESM2	0.47	1.97	1.01	0.07	0.772	11
12	ACCESS1-0	0.57	1.96	1.02	0.06	0.754	12
13	CESM1-BGC	0.52	1.99	1.01	0.04	0.737	13
14	MPI-ESM-LR	0.52	1.83	0.88	0.02	0.715	14
15	inmcm4	0.39	2.27	1.16	−0.15	0.533	15
16	CCSM4	0.45	1.99	1.00	−0.18	0.506	16
17	BNU-ESM	0.47	1.99	1.03	−0.24	0.443	17
18	GFDL-ESM2M	0.45	2.07	1.03	−0.24	0.439	18
19	IPSL-CMSA-MR	0.45	1.99	0.99	−0.25	0.431	19
20	CSIRO-Mk3-′6-0	0.35	2.45	1.13	−0.90	0.165	20
21	MRI-CGCM3	0.43	2.19	1.01	−0.66	0.008	21

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