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Current Affairs

Warming Arabian sea hotbed for cyclones

Date: 20 July 2021 Tags: Climate Change

Issue

Storms in Arabian Sea have risen by 52 percent since 2001. This has made them vulnerable to rising number of cyclones.

 

Background

Bay of Bengal is usually the main region for cyclone development in North Indian Ocean. The Arabian Sea has started to overtake Bay of Bengal in recent years.

 

Details

  • Cyclones in Arabian Sea are slow to make progress and attract as much heat as possible in the sea before turning into intense ones.

  • Many cyclones such as Tauktae have formed near the Lakshadweep Sea and hit the coast of Gujarat and Maharashtra, making them more vulnerable.

  • Storms get stronger and intense as they are able to get heat and moisture in the sea. More the warmth, higher chances of cyclones getting stronger.

  • The accumulated energy of cyclone, which is the total energy during the lifespan of a cyclone, has tripled in Arabian Sea.

  • Generally, the North Indian Ocean regions of Arabian Sea and Bay of Bengal witness five cyclones a year during the months of May and November. Out of five, four originate in Bay of Bengal.

 

New observations

  • The South West region was usually cooler than South Eastern part, making it less prone to cyclone storms. It has changed now.

  • The availability of moisture has also become higher due to heating of sea water in comparison to Bay of Bengal.

  • The other significant observation was that majority of cyclone formed over Arabian Sea were of high intensity, ranging from severe to extremely severe.

  • The duration of cyclone also had an 80 percent rise in the years between 2001 and 2019. Month of November was most conductive for cyclogenesis.