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
flagAustralia
0%
80%
3%
15%
26
flagAustria
5%
52%
11%
29%
17
flagGreece
18%
50%
6%
25%
16
flagPoland
23%
37%
17%
21%
1257
flagIndia
20%
32%
32%
16%
25
flagthe United Kingdom
33%
30%
6%
30%
30
flagthe United States
21%
28%
10%
39%
28
flagRepublic of Ireland
36%
18%
9%
36%
11
flagGermany
33%
17%
10%
38%
68