Rapid warming of Arabian sea among causes of 3-fold rise in erratic rain in central India: Weather experts

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Mains Paper 1: Geography | Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclone etc.

From UPSC perspective, the following things are important:

Prelims level: Cyclones, Anti-cyclones,Greenhouse gas emissions and pollutants.

Mains level: Global warming- Reasons, Impacts and way forward


News

Context

  1. The rain fury that lashed Maharashtra, West Bengal, Bihar and Assam this monsoon, which displaced lives of lakhs of people, could be the new ‘normal’, according to a study.
  2. Scientists have recorded a three-fold rise in such erratic rainfall over central India 

What are the reasons for the increase in rainfall?

  1. Rapid warming of the Arabian Sea.
    • Due to excess warming, there is significant amount of moisture available in the atmosphere.
    • This moisture then gets transported by strong surges of westerly winds over to the Indian mainland during the monsoon, resulting in widespread and heavy rainfall over central India.
  2. Human activities in the post-industrialisation period have triggered an exponential rise in greenhouse gas emissions and pollutants.
  3. Frequency of events such as El Nino, the abnormal warming of central and east-central Pacific Ocean, are driving forces for the warming of Arabian Sea in recent decades
  4. The number of cyclones originating from the Arabian Sea has increased.
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