Fig. 3: Long 2.4-Myr eccentricity (g4−g3) modulates Oligocene and Miocene leads and lags between δ13C and δ18O on 100-kyr eccentricity time-scales. | Nature Communications

Fig. 3: Long 2.4-Myr eccentricity (g4−g3) modulates Oligocene and Miocene leads and lags between δ13C and δ18O on 100-kyr eccentricity time-scales.

From: High-latitude biomes and rock weathering mediate climate–carbon cycle feedbacks on eccentricity timescales

Fig. 3

a Visual comparison of phase analysis results and 2.4-Myr eccentricity cycles, only considering phase-results with coherence >0.3 (see Fig. 2). b Prior to 26 Ma (Interval I), long 2.4-Myr eccentricity minima correlate with time-intervals when δ13C leads δ18O (positive Spearman correlation coefficient of 0.399 between phase and eccentricity). Between 26 and 6 Ma (Interval II), long 2.4-Myr eccentricity minima correlate with time intervals when δ18O leads δ13C (negative Spearman correlation coefficient of −0.240). After 6 Ma (Interval III), the correlation between 2.4-Myr eccentricity and phase ceases (R = −0.084).

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