What is the largest element of the intraseasonal variability in the tropical atmosphere?

Intertropical Convergence Zone
Madden–Julian oscillation
Hadley cell
El Niño–Southern Oscillation
The Madden–Julian oscillation is a large-scale coupling between atmospheric circulation and tropical deep convection. Unlike a standing pattern like the El Niño Southern Oscillation, the Madden–Julian oscillation is a traveling pattern that propagates eastward, through the atmosphere above the warm parts of the Indian and Pacific oceans. This overall circulation pattern manifests itself most clearly as anomalous rainfall.
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Answers by country

Intertropical Convergence Zone
Madden–Julian oscillation
Hadley cell
El Niño–Southern Oscillation
answers
flagGreece
20%
60%
10%
10%
10
flagIndia
7%
42%
42%
7%
14
flagthe United Kingdom
29%
35%
5%
29%
17
flagPoland
22%
33%
20%
23%
748
flagGermany
23%
23%
9%
42%
21
flagthe United States
25%
18%
12%
43%
16