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Consider the following statements with reference to Indian Ocean Basin-Wide (IOBW) index:
1. It indicates the average sea-surface temperature variations across the tropical Indian Ocean.
2. It has a stronger association with the Northern Hemisphere than the Southern Hemisphere of Earth.
Which of the statements given above is/are correct?
  • a)
    1 only
  • b)
    2 only
  • c)
    Both 1 and 2
  • d)
    Neither 1 nor 2
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements with reference to Indian Ocean Basin...
According to the study Indian Ocean basin-wide (IOBW) index exhibits a close association with dengue outbreaks in both the Northern and Southern hemispheres. 
  • It represents the average sea-surface temperature variations across the tropical Indian Ocean.
  • It has emerged as a key indicator for predicting the magnitude and timing of dengue epidemics in each country. 
  • IOBW index’s association with the Southern Hemisphere is stronger than that with the Northern Hemisphere. 
  • The index has a more pronounced impact on temperatures in tropical regions. Brazil, for example, bears a higher burden of dengue in the Southern Hemisphere. 
  • The Northern Hemisphere witnesses a peak dengue epidemic period between July and October and the Southern Hemisphere in February and April, both in the summers.
  • Further, the amplitude of dengue incidence was high when the index was positive and low when it was negative.  
  • The link between the Indian Ocean’s temperature and dengue incidence is likely due to its influence on regional temperatures through teleconnections, large-scale atmospheric patterns that can transfer heat and moisture across vast distances.
Key facts about Dengue
  • It is caused by the dengue virus (DENV)
  • Transmission: It is transmitted to humans through the bites of infected female mosquitoes, primarily the Aedes aegypti mosquito.
  • The severe form of dengue fever, also called dengue hemorrhagic fever, can cause serious bleeding, a sudden drop in blood pressure (shock) and death.
  • It is more common in tropical and subtropical climates.
  • Symptoms: The most common symptoms are high fever, headache, body aches, nausea and rash.
Hence only statement 1 is correct.
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Consider the following statements with reference to Indian Ocean Basin-Wide (IOBW) index:1. It indicates the average sea-surface temperature variations across the tropical Indian Ocean.2. It has a stronger association with the Northern Hemisphere than the Southern Hemisphere of Earth.Which of the statements given above is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'A'. Can you explain this answer?
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