[ 33 ] was negligible in comparison with inter-model differences, even taking into account the fact that the reanalysis-derived uncertainty is probably slightly smaller than actual observational uncertainties [ 35 ]. Under the RCP4.5 and RCP8.5 scenarios, there is a clear trend in westerly winds towards stronger and more poleward jets, with a directly associated positive trend in the SAM [ 36 ].
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