Multiple Choice Questions on La Nina is suspected to have caused recent floods in Australia How is La Nina different from EI Nino........... for Uttarakhand Civil Services (UKPCS) Preparation

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Multiple Choice Questions

La Nina is suspected to have caused recent floods in Australia How is La Nina different from EI Nino...........

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    La Nina is suspected to have caused recent floods in Australia. How is La Nina different from EI Nino? (UPSC 2011)

    1. La Nina is characterized by un-usually cold ocean temperature in equatorial Indian Ocean whereas EI Nino is characterized by unusually warm ocean temperature in the equatorial Pacific Ocean.

    2. EI Nino has an adverse effect on the south-west monsoon of India, but La Nina has no effect on monsoon climate.

    Which of the statements given above is/are correct?

    1 only 

    Incorrect Answer

    2 only

    Incorrect Answer

    Both 1 and 2

    Incorrect Answer

    Neither 1 nor 2

    Correct Answer
    Explanation:
    Characteristics La- Nina El- Nino
    Sea Surface Temperature in the central and eastcentral Equatorial Pacific Large-scale cooling (Cold phase of ENSO) Large-scale warming (warm phase of ENSO)
    Up welling  Enhanced  Reduced
    Trade winds (easterly winds) in the Pacific Stronger than normal Weaker than normal Winds may blow the other way i.e. from west to east (toward South America instead of Indonesia)
    Indian Monsoon Better than normal Monsoon in India (may cause floods) Weakens the Indian Monsoon (may cause draught)
    Frequency of occurrence Less frequent More frequent

    A La Niña phenomena generally affects the same regions that are impacted by El Niño, with opposite climatic consequences. 

    By: Kamal Kashyap
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