Barkeret al., Science 376 , 961–967 (2022) 27 May 2022 6of7
Fig. 6. Changing orbits control the relative timing of terminal ice rafting
versus deglaciation.(A) Offsets between the end of TIR events and deglacial
transitions as a function of benthicd^18 O [blue and red circles; a zero offset means
that the end of TIR occurs in parallel with the midpoint of deglaciation—defined
as the maximum rate of change ind^18 O( 13 ); a negative offset indicates that
TIR ends earlier than the midpoint] compared with offsets between maxima
in obliquity and their nearest minima in precession (gold circles; negative offset
indicates that the closest precession peak occurs before the peak in obliquity and
vice versa). (B) Comparison of the three age models for calculating offsets.
(C) Box plots representing the calculated offsets before (red) and after (blue)
1 Ma. The black curve is the smoothed LR04 stack across termination 2, for
context. (D) Calculated offsets before (red) and after (blue) 1 Ma versus
the phasing between obliquity and precession [roman numerals refer to (A)].
For events >1 Ma the relationship is significant (P < 0.005, R = −0.73) ( 13 ).
(E) Examples of the various phasing between obliquity and precession shown in
(D) and associated offsets between TIR events and deglaciation. Orange diamonds
represent the end of TIR events and white diamonds are deglacial transitions
(each data point represents the mean of the three age model results ±1s).RESEARCH | RESEARCH ARTICLE