20 March 2019 Current Affairs:
Indian National Centre for Ocean Information Services (INCOIS) researchers, in collaboration with scientists from France, have discovered the existence of a ‘synchronous oscillation’ of sea level across the entire Tropical Indian Ocean with a time period of 30 to 80 days during winter months of December to April.
In these months, Indian Ocean routinely gains/loses 3 trillion tonnes of water from the Pacific Ocean every 30-80 days accompanied by a sea level rise/fall of 4 cm which is 30% of total sea-level change.
This process is driven by intense winds hovering over a small area in the eastern Indian Ocean. This wind is associated with tropical weather phenomenon called Madden-Julian Oscillation (MJO). MJOs, being a low-pressure system, is known to facilitate cyclone formation over the Indian Ocean. The study said the waves gain more relevance since MJOs are gradually getting more intense in the warming climate.