Variance(arbitary units 400 kyr 100 kyr 40k y「 Quaternary 6-7 kyr 2-2.5kyr 100-400 years Centennial 9-3 .25-35 years Interdecadal 10-20 years 2-2.5 years QBO, Interannual 1 year 30-60 days Intraseasonal 3-7 days G. Plaut. M. Ghil 1 day andr. vautard (1995) Science, 268:710-713G. Plaut, M. Ghil and R. Vautard, (1995) Science, 268: 710–713