Table 1 The principal frequencies, period lengths of these three frequencies, the number of samples in each period, and their corresponding modes, from the MTM analysis for each of the D1-D5 intervals of the QT ice core δ18O depth series
From: A reconstructed PDO history from an ice core isotope record on the central Tibetan Plateau
Depth (m) | Frequency (cycles/m) | Period (m) | Sample size | Corresponding mode |
|---|---|---|---|---|
D1 (0–10 m) | 1.1–1.5 | 0.67–0.91 | 22.3–30.3 | ENSO |
3.4 | 0.29 | 9.7 | Biennial | |
6.5 | 0.15 | 5 | Annual | |
D2 (10–20 m) | 1.2–2 | 0.5–0.83 | 16.7–27.7 | ENSO |
2.5–3.7 | 0.27–0.4 | 9–13.3 | Biennial | |
5.7–6.3 | 0.16–0.18 | 5.3–6 | Annual | |
D3 (20–30 m) | 0.7–1.8 | 0.56–1.43 | 18.7–47.6 | ENSO |
2.7–3.2 | 0.31–0.37 | 10.3–12.3 | Biennial | |
4.9–5.6 | 0.18–0.2 | 6–6.7 | Annual | |
D4 (30–40 m) | 1.5–2 | 0.5–0.67 | 16.7–22.3 | ENSO |
2.6–3.5 | 0.29–0.38 | 9.7–12.7 | Biennial | |
5.4 | 0.19 | 6.3 | Annual | |
D5 (40–50 m) | 1.5 | 0.67 | 22.3 | ENSO |
2.9–3.4 | 0.29–0.34 | 9.7–11.3 | Biennial | |
6.6 | 0.15 | 5 | Annual |
