Extended Data Fig. 3: Modern and Glacial ocean meridional overturning circulation.
From: Atmospheric CO2 control of spontaneous millennial-scale ice age climate oscillations
a) Global zonal average overturning streamfunction (Sv) from the original NCAR CCSM4 simulation described in67. b) Global zonal average overturning streamfunction (Sv) from the modified CCSM4 pre-industrial control simulation (BL) used in this study. The same as in b) but for the glacial c) stadial and d) interstadial climate from a simulation with CO2=210 ppm. The maximum in NADW and AABW overturning streamfunctions (Sv) in the glacial climate are highlighted with white and yellow ellipses, respectively. These two points form the basis for the two degrees of freedom in our simple model.
