Discussion
The Madden-Julian Oscillations (MJO) has a zonal wavenumber 1 with maximum amplitude in the deep tropics, and it moves eastward around the equator with a period of :
Answer: C
The MJO has a period of 30-60 days.
The Madden-Julian Oscillation, discovered by Roland Madden and Paul Julian in 1971, is the dominant intraseasonal variation in the tropics: an eastward-moving envelope of enhanced and suppressed convection that travels around the globe in about 30 to 60 days (often quoted as 30-90 days). It affects the active and break phases of the Indian monsoon and tropical cyclone formation.
10-20 days is the period of the quasi-biweekly mode of the monsoon, a different oscillation. 70-80 and 80-90 days lie beyond the MJO's usual range.
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