Discussion
Which speed does the Madden-Julian Oscillation propagate at?
Answer: B
The convective envelope moves eastward at roughly 5 metres per second across the warm pool, far slower than a dry Kelvin wave, which is the central puzzle the theory must explain. The slowing is attributed to the interaction between the wave and the moisture field. Once past the dateline the circulation signal speeds up as it decouples from the convection. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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