Extended Data Fig. 3: Cold tongue annual cycle in EC Earth also shows consistent variation with changing LOP.
From: Two annual cycles of the Pacific cold tongue under orbital precession
Plotted is the climatological monthly mean SST averaged over 6°S–6°N (same as Fig. 2) for the (a) Precession maximum, minimum obliquity (Pmax), (b) Precession minimum, minimum obliquity (Pmin), and (c) Minimum obliquity with circular orbit (Tmin) runs in Bosmans et al. (2015)50. To facilitate comparison, an offset is added to each panel so that the annual mean SST averaged over 145–275°E is the same as for the observational data as shown in Extended Data Fig. 1a, 27.44 °C. The orbital parameters are slightly different, but Pmax corresponds approximately to the LOP = 90° simulation, Pmin to LOP = 270° simulation, and Tmin to the e = 0 simulation. The column positioning of the panels corresponds to the equivalent LOP or e = 0 case in Fig. 2. See Methods section on 'Earth System Model simulations' for the orbital parameters and details of the simulations.
