Triple Dip La Nina

 

What is Triple-dip La Nina ?

Ans : A 'triple-dip La Nina is a multiyear cooling of the surface temperature of the equatorial Pacific Ocean.

La Nina refers to the large-scale cooling of the ocean surface tempertaures in the central and eastern equatorial Pacific Ocean, coupled with changes in the tropical atmospheric circulation, namely winds,pressure and rainfall. 

In La Nina strong winds blow warm water on the surface of the Pacific Ocean near the coast of South America across the equator toward Indonesia, other parts of Asi and Australia.

This causes cooler water to rise to the surface of the Pacific Ocean, which has wide-ranging ripple effects on the weather.

Impact :

1)Good rainfall during monsoon season in Inda

2)Increase in number of hurricanes and tropical cyclones

3)Excessive rainfall and flooding in India's neighbouring country i.e., Arabian coast

4)Persistence of La Nina can worsen drought in Africa

5)In most parts of USA, La Nina may be associated with very dry winters.

Thus, prolonged La Nina can result in widespread drought in USA

6)In Australia and Indonesia, and generally in the tropical reion, La Nina is expected to bring more rain fall and thus prolonged La Nina may result in flooding.