ARE SOLELY RESPONSIBLE FOR MORE & MORE CYCLONES?
Bay of Bengal had witnessed maximum sea surface temperature during first half of May-2020.It was about 32-34°C which was prior formation of Cyclone Amphan.
The sea surface temperature above 28°C acted as a threshold for deep atmospheric convection.
High ocean temperature acts as a cyclone fuel.A small rise in sea surface temperature causes more vapours making cyclone more intense.High ocean temperature led by unusual warming may have cause more cyclonic intensification.
Tropical cyclone have lately shown unusual characteristics e.g.unexpected change in direction, influencing the speed & intensification of a cyclone.
As we go away from the Equator sea water becomes cooler towards the poles.As a result tropical cyclones do not get enough energy to move further towards the Rotation of the Earth,Earth supports the spinning of a cyclone and this rotating effects keeps increasing as we go away from the Equator to Poles.
These two factors unusual warming & Earth’s rotation may contribute to increase the storm range.
Historical data shows the Indian Ocean moving further to south and closer to place like South Africa.The gradual warning of the Indian Ocean is the suspected reason.
Those intensification and unpredictable moving trends of cyclone are highly dangerous, increasing vulnerability of the less prepared,less cyclone prone poor community.