Simpson is very grateful to Charles McLandress for useful discussions as well as to Martin Keller and Gang Chen for advice on cospectra calculations. We are also grateful to Elizabeth Barnes and an anonymous reviewer for their helpful comments on this manuscript. This work was partly funded by the Natural Sciences and Engineering Research Council of Canada and partly by a UK Natural Environment Research Council PhD studentship.
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SBHS10 incorrectly stated that a subtropical reflecting surface is present for the most poleward jet (TR5). In fact a critical line (u = c = 8 m s−1) is found before