The authors thank Brett Mullan and James Renwick for discussion on the ideas developed in this paper, and Jonathan Gregory for assistance in acquiring some of the climate model data. We also acknowledge the significant improvements contributed to this paper by the anonymous reviewers. This work was partially funded by the New Zealand Foundation for Research Science and Technology under Contract C01X0701 and by the Defra and MoD Integrated Climate Programme GA01101, CBC/2B/0417_Annex C5.
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