Table 7 Significance tests of the mean differences among δ18O and SST components and the solution of orbital forcings (Laskar et al. 1993) binned at three arbitrary constant time intervals (532 kyr, 760 kyr, and 1064 kyr). Data standardized on the entire Plio-Pleistocene record (mean = 0, standard deviation = 1) and, where necessary, inverted to have the same paleoclimatic polarity (positive values for positive forcing and warming)
Component/forcing | Time bin (kyr) | Meana | Sum of squares | df | F | Sig. |
|---|---|---|---|---|---|---|
LR04 comp-1 | 532 | − 1.47 ÷ 1.18 | 5059.52 | 9 | 11,504.34 | 0.00 |
760 | − 1.51 ÷ 1.13 | 4996.27 | 6 | 13,708.49 | 0.00 | |
1064 | − 1.43 ÷ 1.14 | 4917.43 | 4 | 16,271.23 | 0.00 | |
LR04 comp-1 subcomp-1 | 532 | − 1.47 ÷ 1.21 | 5257.57 | 9 | 50,499.31 | 0.00 |
760 | − 1.50 ÷ 1.17 | 5182.42 | 6 | 33,599.07 | 0.00 | |
1064 | − 1.44 ÷ 1.17 | 5116.42 | 4 | 33,559.24 | 0.00 | |
LR04 comp-1 exp.fit. trend | 532 | − 1.72 ÷ 1.40 | 5262.71 | 9 | 55,162.47 | 0.00 |
760 | − 1.62 ÷ 1.35 | 5204.25 | 6 | 40,161.50 | 0.00 | |
1064 | − 1.49 ÷ 1.28 | 5094.35 | 4 | 30,132.42 | 0.00 | |
LR04 comp-2-11 (orbitals) | 532 | − 0.08 ÷ 0.09 | 8.80 | 9 | 0.98 | 0.46 |
760 | − 0.01 ÷ 0.02 | 0.74 | 6 | 0.12 | 0.99 | |
1064 | − 0.01 ÷ 0.01 | 0.33 | 4 | 0.08 | 0.99 | |
SST comp-1 | 532 | − 1.45 ÷ 1.26 | 4644.74 | 9 | 6235.99 | 0.00 |
760 | − 1.42 ÷ 1.27 | 4468.87 | 6 | 6339.54 | 0.00 | |
1064 | − 1.38 ÷ 1.16 | 4389.59 | 4 | 8244.21 | 0.00 | |
SST comp-1 subcomp-1 | 532 | − 1.49 ÷ 1.26 | 4950.98 | 9 | 24,819.72 | 0.00 |
760 | − 1.49 ÷ 1.33 | 4838.36 | 6 | 18,152.80 | 0.00 | |
1064 | − 1.42 ÷ 1.18 | 4722.96 | 4 | 17,566.50 | 0.00 | |
SST comp-1 exp.fit. trend | 532 | − 1.67 ÷ 1.50 | 5006.76 | 9 | 49,988.56 | 0.00 |
760 | − 1.57 ÷ 1.44 | 4949.41 | 6 | 36,725.39 | 0.00 | |
1064 | − 1.44 ÷ 1.36 | 4842.28 | 4 | 27,747.29 | 0.00 | |
SST comp-2-11 (orbitals) | 532 | − 0.09 ÷ 0.04 | 6.25 | 9 | 0.69 | 0.71 |
760 | − 0.01 ÷ 0.02 | 0.89 | 6 | 0.15 | 0.99 | |
1064 | − 0.02 ÷ 0.01 | 0.60 | 4 | 0.15 | 0.96 | |
Eccentricity | 532 | − 0.30 ÷ 0.25 | 169.60 | 9 | 19.43 | 0.00 |
760 | − 0.28 ÷ 0.28 | 143.98 | 6 | 24.64 | 0.00 | |
1064 | − 0.22 ÷ 0.14 | 77.44 | 4 | 19.63 | 0.00 | |
Obliquity | 532 | − 0.12 ÷ 0.11 | 35.42 | 9 | 3.96 | 0.00 |
760 | − 0.12 ÷ 0.12 | 37.02 | 6 | 6.21 | 0.00 | |
1064 | − 0.11 ÷ 0.10 | 31.96 | 4 | 8.03 | 0.00 | |
Precession | 532 | − 0.02 ÷ 0.01 | 0.30 | 9 | 0.03 | 1.00 |
760 | 0.00 | 0.02 | 6 | 0.00 | 1.00 | |
1064 | − 0.01 ÷ 0.01 | 0.12 | 4 | 0.03 | 1.00 | |
65°N Insolation at June 21 | 532 | − 0.08 ÷ 0.06 | 8.69 | 9 | 0.97 | 0.47 |
760 | − 0.05 ÷ 0.06 | 8.89 | 6 | 1.48 | 0.18 | |
1064 | − 0.05 ÷ 0.04 | 6.37 | 4 | 1.59 | 0.17 |