δ18O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend

Viaggi, Paolo

doi:10.1186/s40645-018-0236-z

Progress in Earth and Planetary Science

Table 8 Cross-spectral analysis results among the orbital forcings (Laskar et al. 1993) and the orbitally driven δ¹⁸O and SST components for three time intervals. Data standardized (mean = 0, standard deviation = 1) and, where necessary, inverted to have the same paleoclimatic polarity (positive values for positive forcing and warming)

From: δ¹⁸O and SST signal decomposition and dynamic of the Pliocene-Pleistocene climate system: new insights on orbital nonlinear behavior vs. long-term trend

Time interval	Orbital forcing	Response component	Cross-spectrum freq. (kyr⁻¹)	Cross-spectrum period (kyr)	Coherency	Phase shift
Post-MPT start	Eccentricity	LR04 comp-2 subcomp-1-4, 9-15	0.010742	93	0.72	− 16.65°	− 4.31 kyr	δ¹⁸O component lags eccentricity
	Eccentricity	SST comp-2 subcomp-1-4	0.010742	93	0.70	− 01.70°	− 0.44 kyr	SST component lags eccentricity
	Obliquity	LR04 comp-3-4	0.024414	41	0.93	− 65.20°	− 7.42 kyr	δ¹⁸O component lags obliquity
	Obliquity	SST comp-3-4	0.024414	41	0.68	− 23.78°	− 2.71 kyr	SST component lags obliquity
	Precession	LR04 comp-5-7	0.041992	24	0.78	− 74.50°	− 4.93 kyr	δ¹⁸O component lags precession
	Precession	SST comp-5-7	0.041992	24	0.72	− 53.24°	− 3.52 kyr	SST component lags precession
ONHG-MPT start	Eccentricity	LR04 comp-2 subcomp-1-4, 9-15	0.010742	93	0.47	− 27.57°	− 7.13 kyr	δ¹⁸O component lags eccentricity
	Eccentricity	SST comp-2 subcomp-1-4	0.010742	93	0.45	− 21.37°	− 5.53 kyr	SST component lags eccentricity
	Obliquity	LR04 comp-3-4	0.024414	41	0.98	− 50.79°	− 5.78 kyr	δ¹⁸O component lags obliquity
	Obliquity	SST comp-3-4	0.024658	41	0.95	− 46.85°	− 5.28 kyr	SST component lags obliquity
	Precession	LR04 comp-5-7	0.044678	22	0.89	− 57.37°	− 3.57 kyr	δ¹⁸O component lags precession
	Precession	SST comp-5-7	0.042236	24	0.28	− 119.35	− 7.85 kyr	SST component lags precession
Pre-ONHG	Eccentricity	LR04 comp-2 subcomp-1-4, 9-15	0.009766	102	0.32	− 01.48°	− 0.42 kyr	δ¹⁸O component lags eccentricity
	Eccentricity	SST comp-2 subcomp-1-4	0.010742	93	0.13	+ 07.06°	1.83 kyr	SST component leads eccentricity
	Obliquity	LR04 comp-3-4	0.024414	41	0.95	− 36.02°	− 4.10 kyr	δ¹⁸O component lags obliquity
	Obliquity	SST comp-3-4	0.024414	41	0.81	− 30.42°	− 3.46 kyr	SST component lags obliquity
	Precession	LR04 comp-5-7	0.042480	24	0.42	− 88.11°	− 5.76 kyr	δ¹⁸O component lags precession
	Precession	SST comp-5-7	0.042480	24	0.59	− 87.60°	− 5.73 kyr	SST component lags precession

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