Table 2 Descriptive parameters and Fourier frequency results of the δ18O subcomponents isolated from the LR04 component-1 by singular spectrum analysis. The processing of the subcomponents was conducted to better separate and estimate the variance fraction of specific frequency bands from still complex data components. The italicized percentage values are the absolute variance of the subcomponents (referred to the total LR04 variance)
δ18O comp. rank | δ18O comp. variance (%) | δ18O subcomp. rank | δ18O subcomp. var. (rel.) (%) | δ18O subcomp. var. (abs) (%) | Frequency (kyr−1) | TISA power (%) | Period (kyr) | Forcing | |
|---|---|---|---|---|---|---|---|---|---|
1 | 81.5 | 1 | 96.2 | 78.4 | 0.0007519 | 96.6 | 1330 | Not significant peak (< 50% of critical significance level) | Long-term trend + obliquity modulation cycle |
2 | 1.0 | 0.8 | 0.0006351 | 94.9 | 1575 | Obliquity modulation cycle | |||
0.0024431 | 5.1 | 409 | Eccentricity (long) | ||||||
3–10 | 2.8 | 2.3 | 0.0034061 | 16.0 | 294 | Earth’s orbit secular frequency | |||
0.0051192 | 24.5 | 195 | Obliquity modulation cycle | ||||||
0.0061178 | 16.6 | 163 | |||||||
0.0075215 | 15.6 | 133 | Eccentricity (short) | ||||||
0.0093870 | 12.8 | 107 | |||||||
0.0105656 | 14.5 | 95 | |||||||