Indian summer monsoon rainfall influenced by IOD: National Institute of Oceanography Goa

Q.  What does IOD stand for in the context of Indian summer monsoon rainfall?
- Published on 11 Jul 16

a. Indian Ocean Dipole
b. Indian Oscillatory Dipole
c. International Ocean Dipole
d. International Oscillatory Dipole

ANSWER: Indian Ocean Dipole
 
Indian summer monsoon rain is influenced by a system of oscillating sea surface temperatures known as Indian Ocean Dipole in which the Western Indian Ocean becomes warmer and colder than the eastern part of the ocean.

Existence of three types of IOD indicate that to determine the effects of monsoon rainfall, each of these three types have to be considered.
  • Positive IOD leads to increased and above active rainfall while negative IOD leads to less rainfall and more monsoon break.

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