Table 2.

Ideal, FDT, and qG-FDT mean and variance response to the change in forcing or dissipation with the corresponding percentage errors for the five cases given in Table 1

	Case	Ideal	FDT	qG-FDT	FDT % error	qG-FDT % error
	S	0.1814	0.1827	0.3197	0.70	76
	B	0.1621	0.1633	0.3425	0.72	111
	U	0.1555	0.1591	0.8655	2.29	457
	PC-1	40.54	40.52	41.84	0.05	3.21
	NAO	5.41	5.46	5.51	0.93	1.84
	S	0.0533	0.0536	−0.0937	0.57	276
	B	0.0486	0.0499	−0.1639	2.55	437
	U	0.0401	0.0334	−0.8988	16.71	2339
	PC-1	6.13	6.66	16.91	8.69	176
	NAO	−71.00	−71.16	−71.37	0.22	0.51
	S	−0.0522	−0.0540	−0.2331	3.4	346
	B	−0.0490	−0.0463	−0.3218	5.5	557
	U	−0.0630	−0.0702	−1.2797	11.5	1932
	PC-1	11.23	11.24	16.02	0.08	42
	NAO	0.470	0.473	0.715	0.72	52
	S	0.0083	0.0071	0.157	15	1798
	B	0.0104	0.0107	0.291	3.1	2714
	U	0.0207	0.0304	1.56	47	7431
	PC-1	36.25	36.16	34.30	0.23	5.4
	NAO	−5.185	−5.186	−8.1	0.03	56