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Q4 (IAS/2010) Geography › World Physical Geography › Ocean-atmosphere oscillations Answer Verified

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 ?

Result
Your answer: —  ·  Correct: B
Explanation

Statement 1 is incorrect: the canonical (normal) El Niño is characterized by anomalous warming in the eastern equatorial Pacific, whereas El Niño Modoki (a central-Pacific or CP event) has peak warming in the central tropical Pacific with cooling to east and west [1]. Statement 2 is correct: canonical El Niño events tend to suppress Atlantic hurricane activity (via increased upper-level winds and vertical wind shear), reducing frequency and intensity in the Atlantic basin [2]. El Niño Modoki exhibits a displaced and generally weaker atmospheric teleconnection; in some years it does not produce the same suppression and can allow a relatively higher Atlantic hurricane count (i.e., “more room for a bumper crop”) compared with canonical events [3]. Hence only statement 2 is correct.

Sources

  1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 29: El Nino, La Nina & El Nino Modoki > El Nino Modoki > p. 413
  2. [2] https://www.climate.gov/news-features/blogs/enso/impacts-el-nino-and-la-nina-hurricane-season
  3. [3] https://news.ucar.edu/962/watching-modoki
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SIMILAR QUESTIONS

NDA-II · 2012 · Q88 Relevance score: 1.00

Consider the following statements regarding El Nino effect on Indian monsoon: 1. The surface temperature goes up in the Southern Pacific Ocean and there is dificient rainfall in India. 2. The Walker Circulation shifts Eastward from its normal position and reduces monsoon rainfall in India. Which of the statement(s) given above is/are correct?

NDA-II · 2013 · Q53 Relevance score: 0.70

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