Question

With reference to El Nino, consider the following statements:

1. EI-Nino is merely an extension of the warm equatorial current.

2. It is used in India for forecasting long range monsoon rainfall.

3. It appears once every three to seven years.

Select the correct answer using the code given below.  

1. 1 and 2 only
2. 2 and 3 only
3. 1 and 3 only 
4. 1, 2 and 3

Answer 1

Correct Answer - Option 4 : 1, 2 and 3

The correct answer is 1, 2 and 3

• El Nino is a pattern of the atmosphere that explains the unprecedented warming of the eastern tropical Pacific Ocean's surface waters.
• El-Nino is associated with a band of warm ocean water that develops off the Pacific coast of South America in the central and eastern-central equatorial Pacific, including the region.
• EI-Nino is a dynamic weather phenomenon that happens in various parts of the world once every three to seven years, bringing drought, floods and other severe weather.
• EI-Nino is used for predicting long-range monsoon rainfall in India. A wild EI-Nino outbreak occurred in 1990-91, and the onset of the southwest monsoon was postponed for most parts of the world from five to twelve days.

• With the appearance of warm currents off the coast of Peru in the Eastern Pacific, the system includes ocean and atmospheric phenomena and influences the weather in many countries, including India.
• EI-Nino is merely a warm equatorial current extension that is briefly replaced by the cool Peruvian current or Humbolt current.
• Due to El Nino, the cool surface water off the Peruvian coast goes warm.
• The upwelling of cold water is decreased by El Nino, limiting the nitrogen uplift from the bottom of the ocean.