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UPSC 2017: 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 Niño’s impact on the monsoon. Select the correct answer using the code given below:
(a)1 only
(b)2 only
(c)Both 1 and 2
(d)Neither 1 nor 2
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Not attemptedCorrect Answer: (b) 2 only
The Indian Ocean Dipole (IOD) is defined by the difference in sea-surface temperatures between the western and eastern parts of the Indian Ocean, not between the western Indian Ocean and the eastern Pacific; therefore Statement 1 is wrong. A positive or negative IOD can amplify or offset the effects of El Niño on the Indian monsoon, so Statement 2 is right. ([en.wikipedia.org](https://en.wikipedia.org/wiki/Indian_Ocean_Dipole?utm_source=openai))
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What is the correct answer to this UPSC 2017 Geography question?▼
The correct answer is option (b): 2 only. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Atmosphere & Climatology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2017, GS Paper 1, as Question 66. It falls under Geography > Atmosphere & Climatology.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Atmosphere & Climatology?▼
UPSC has asked 70 questions from Atmosphere & Climatology (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.