Explanation: Blue Ocean event refers to a situation in which the Arctic Ocean’s ice area drops below 1 million Sq. Km leading to the change of arctic surface color from white to blue.

The process reduces the amount of sunlight reflected into space, leading to further warming and ice loss.

Source: https://www.thehindu.com/sci-tech/energy-and-environment/arctic-ocean-ice-free-summer-2030s-blue-ocean-event/article66988883.ece