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Q32 (UPPCS/2023) Geography › World Physical Geography

With reference to the "EL-NINO", which of the following statement/s is/are correct?
(1) El - Nino involves appearance of warm current of the coast of Peru in eastern pacific.
(2) This warm current increase the temperature of water on the Peruvian coast by 10°C there by increasing the amount of Plankton in the sea.
Select the correct answer using the code given below -
Code -

Result
Your answer: —  Â·  Correct: C

Explanation

Statement 1 is correct: El Niño is a climate pattern characterized by the unusual warming of surface waters in the eastern tropical Pacific Ocean, appearing off the coast of Peru and Ecuador. It is the warm phase of the El Niño-Southern Oscillation (ENSO).

Statement 2 is incorrect: While El Niño does increase sea surface temperatures (typically by 1°C to 3°C, though extreme cases vary), it decreases the amount of plankton. The warm water layer prevents the upwelling of cold, nutrient-rich deeper waters. Since phytoplankton depend on these nutrients, their population declines sharply, which subsequently leads to a reduction in fish populations (like anchovies) that feed on them. Therefore, El Niño is detrimental to the marine ecosystem and the fishing industry of the Peruvian coast.

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SIMILAR QUESTIONS

IAS · 2010 · Q4 Relevance score: 2.52

A new type of El Nino called El Nino Modoki appeared in the news. In this context, consider the following statements: 1. Normal El Nino forms in the Central Pacific ocean whereas El-Nino Modoki forms in Eastern Pacific ocean. 2. Normal EI Nino results in diminished hurricanes in the Atlantic ocean but El Nino Modoki results in a greater number of hurricanes with greater frequency. Which of the statements given above is/are correct ?

NDA-II · 2010 · Q2 Relevance score: 1.37

Which among the following statements characterized El Nino? I. It occurs at irregular intervals II. It carriers warmer water III. It carries less saline water IV. Its atmospheric equivalent is southern oscillation Select the correct answer using the code given below

IAS · 2017 · Q66 Relevance score: 1.14

With reference to 'Indian Ocean Dipole (IOD)' sometimes mentioned in the news while forecasting Indian monsoon, which of the following statements is/are correct ? 1. IOD phenomenon is characterised by a difference in sea surface temperature between tropical Western Indian Ocean and tropical Eastern Pacific Ocean. 2. An IOD phenomenon can influence an El Nino's impact on the monsoon. Select the correct answer using the code given below :

CDS-II · 2011 · Q1 Relevance score: 0.77

Statement I : El Nino is a temperature rising phenomenon over the Pacific Ocean and usually causes dry mon- soon in South Asia. Statement II. : Tsunamis are usually not noticed as the massive ocean waves move silently but assume destructive form as these travel through shallow waters of continental shelves.

IAS · 2011 · Q52 Relevance score: 0.72

La Nina is suspected to have caused recent floods in Australia. How is La Nina different from EI Nino? 1. La Nia is characterised by unusually cold ocean temperature in equatorial Indian Ocean whereas EI Nino is characterised by unusually warm ocean temperature in the equatorial Pacific Ocean. 2. El Nino has adverse effect on southwest monsoon of India, but La Nina has no effect on monsoon climate. Which of the statements given above is/ correct?