Delayed slow ocean response to CO2 removal causes asymmetric tropical rainfall change (IMAGE)
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Fig. 1. Evolution of global mean and patterns of change in surface temperature and rainfall during the CO2 ramp-up and ramp-down periods. (a) The 21-year running mean of atmospheric CO2 concentration (green) and the annual-mean changes in global mean surface temperature (red) and rainfall (blue) in the CO2 ramp-up/ramp-down experiment. The dashed vertical line indicates year 140, when the CO2 concentration peaks. The two grey bands covering years 62–81 and 237–256 denote the two representative time slices of 2 °C global mean warming during ramp-up and ramp-down. Changes in tropical rainfall (b, c) and the thermodynamic (d, e) and dynamic (f, g) components in the 2 °C warming time slices during CO2 ramp-up (b, d, f) and ramp-down (c, e, g). The contours in (b) represent the climatology of tropical rainfall in piControl (interval: 2 mm d−1). The spatial correlation coefficients between the sum of the thermodynamic and dynamic components and tropical rainfall changes are shown in the top-right corners of (b) and (c). Stippling in (b–g) indicates that at least five out of six models agree on the sign of the multi-model mean.
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