Emerging hemispheric asymmetry of Earth's radiation.

The increasing trend in the NH–SH tropical precipitation difference is qualitatively consistent with a decreasing trend in the cloud contribution to the NH–SH tropical ASR difference ( Fig. 4 C )—we find that SH tropical precipitation decreases relative to the NH tropics and SH tropical ASR resulting from cloud changes increases relative to the NH tropics, implying progressively less precipitation and clouds in the SH tropics relative to the NH tropics with time.

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S5 show a large negative trend in the NH–SH difference in the sum of cloud feedback and cloud feedback masking ( Δ W CRE ) and a positive trend in the NH–SH difference in the sum of ERF and ERF cloud-masking ( Δ ERF CRE ).

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As the trends in the NH–SH ASR and OLR differences correspond to radiative heating and cooling of the NH relative to the SH, respectively, they largely offset one other, resulting in a weak trend in the NH–SH NET difference (0.14 ± 0.21 Wm –2 dec –1 ; Table 1 ).

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Both the NH and SH show an increasing trend in OLR, but radiative cooling is stronger in the NH, resulting in a NH–SH OLR difference trend of 0.21±0.21 Wm –2 dec –1 , just barely within the 5 to 95% CI.

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