The Western Australian State Government provided funding for this research through the Indian Ocean Climate Initiative. The author is grateful to Bryson Bates for helpful discussions during the development of the ideas described in this paper, to Brent Henderson for comments on an early draft of this paper, and to Lenny Smith for a stimulating early conversation. I am indebted to Andreas Hense and an anonymous referee for very thoughtful comments on earlier versions, which led to a substantial improvement in both the content and presentation of the paper.
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