Cycle Analysis Method of Tree Ring and Solar Activity Based on Variational Mode Decomposition and Hilbert Transform

Table 1

Variance contribution rate, correlation coefficient calculation, and sorting condition of IMF components of tree ring width.

Component	IMF1	IMF2	IMF3	IMF4	IMF5	IMF6	IMF7	IMF8	IMF9	Res
Quasicycles/year	25.6	9.8	7.3	5.8	4.9	3.5	2.9	2.4	2.2
Variance contribution rate (%)	10.01	15.14	15.56	8.88	6.61	5.52	3.95	7.86	5.32	21.17
Correlation coefficient	0.36	0.41	0.39	0.33	0.29	0.26	0.22	0.27	0.26
Sequencing	3	2	1	4	6	8	9	5	7