Differences Between El Niño and La Niña: Two Phases of a Global Climate Phenomenon

UNGKIT.COM – El Niño and La Niña are two opposing phases of the global climate phenomenon known as ENSO (El Niño-Southern Oscillation), which occurs in the Pacific Ocean.

ENSO is a natural phenomenon resulting from changes in sea surface temperatures and atmospheric circulation in the central to eastern Pacific Ocean.

These changes affect the strength of trade winds, which play a key role in regulating heat distribution, cloud formation, and rainfall patterns across the tropics.

The ENSO phenomenon consists of two contrasting phases—El Niño and La Niña—each of which has a distinct impact on hydrological conditions in Indonesia.

El Niño causes sea surface temperatures in the central and eastern Pacific Ocean to become warmer than normal. At the same time, trade winds weaken or even reverse direction, pushing warm water masses away from Indonesia toward the east, in the direction of South America.

During an El Niño event, rainfall decreases drastically, causing Indonesia to become drier. This increases the risk of prolonged drought, crop failure, and a higher potential for forest and land fires.

Conversely, La Niña causes sea surface temperatures in the central and eastern Pacific Ocean to become cooler than normal.

Simultaneously, trade winds strengthen, pushing a larger volume of warm water to accumulate in the western Pacific, including the waters surrounding Indonesia.

La Niña leads to a significant increase in rainfall across Indonesia, triggering a wet dry season that raises the risk of flooding, inundation, landslides, and increased river discharge. (*)

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