Table 1 Main descriptive parameters and Fourier frequency results of the five δ18O components isolated from the LR04 signal by singular spectrum analysis. The spectral peaks of the trend component-1 are not significant (< 50% of critical significance level) and are shown only for the purpose of discussion. Original LR04 data from Lisiecki and Raymo (2005b) are resampled at 1 kyr
δ18O component rank | δ18O comp. variance (%) | Frequency (kyr−1) | TISA power (%) | Period (kyr) | Weighted mean period (kyr) | Forcing |
|---|---|---|---|---|---|---|
1 | 81.5 | 0.0007519 | 77.2 | 1330 | Not significant peaks (< 50% of critical significance level) | Long-term trend + long-period orbital modulation and eccentricity cycles |
0.0024474 | 10.8 | 409 | ||||
0.0034051 | 6.9 | 294 | ||||
0.0051187 | 5.1 | 195 | ||||
2 | 7.3 | 0.0105636 | 20.9 | 95 | Transition obliquity to short eccentricity | |
0.0140889 | 16.8 | 71 | ||||
0.0186578 | 22.3 | 54 | ||||
0.0244330 | 40.1 | 41 | ||||
3–4 | 8.1 | 0.0244339 | 83.1 | 41 | 41 | Obliquity |
0.0253170 | 12.2 | 39 | ||||
0.0186593 | 4.7 | 54 | ||||
5–7 | 2.0 | 0.0422565 | 25.7 | 24 | 22 | Precession |
0.0447325 | 57.6 | 22 | ||||
0.0487779 | 16.7 | 21 | ||||
8–11 | 0.6 | 0.0700410 | 27.0 | 14 | 13 | “Half-precession” (equatorial) |
0.0764743 | 46.5 | 13 | ||||
0.0893457 | 26.5 | 11 | ||||
> 11 | 0.5 | Noise |