Discussion
Which speed would angular momentum conservation predict at 30 degrees?
Answer: B
Starting from rest at the equator, conservation gives a zonal wind of \( \Omega a \sin^{2}\phi / \cos\phi \), which at 30 degrees works out at roughly 130 metres per second. The observed subtropical jet reaches only about a third of this, showing that eddies and friction remove momentum along the way. The disagreement is more instructive than agreement would have been. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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