Discussion
A tropical wavenumber-frequency spectrum shows a strong ridge at eastward wavenumber one with a period of about 40 days.
Which phenomenon does this represent?
Answer: D
Eastward wavenumber one with a period between 30 and 60 days is the signature of the Madden Julian Oscillation, whose propagation speed of about 5 metres per second is far below that of a dry Kelvin wave. Kelvin waves appear at much shorter periods on the same diagram. The quasi-biennial oscillation has a period of over two years and does not appear in an intraseasonal spectrum at all. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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