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Why is the Southern Oscillation Index used in monsoon study?

Answer and explanation

Correct answer: It helps understand monsoon tendency through pressure difference signals

The Southern Oscillation Index, or SOI, is connected with differences in atmospheric pressure between important locations over the tropical Pacific region. Changes in this pressure relationship are associated with the Southern Oscillation and can be related to broader ocean-atmosphere conditions that influence monsoon behaviour. Scientists therefore use SOI as one indicator while studying or forecasting possible monsoon tendencies. It is a signal, not a complete guarantee of the rainfall result.

Option B is correct because it refers to pressure-difference signals and their use in understanding monsoon tendencies. The index does not measure the age of mountains, the length of rivers, or only the amount of salt in seawater. Those subjects are unrelated to the purpose of a pressure-based atmospheric indicator. Thus, the key idea is pressure variation and its possible connection with monsoon patterns.

Related tags

ClimateIndian MonsoonSouthern Oscillation

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