The giant ocean eddy that cooled Sydney’s shores a year ago has been superseded by another 300 km diameter giant.

Australian scientists have identified the missing deep ocean pathway – or ‘supergyre’ – linking the three Southern Hemisphere ocean basins in research that will help them explain more accurately how the ocean governs global climate.

Using an ocean of data, sophisticated mathematical models and supercomputing resources, researchers at the Department of Energy's Oak Ridge National Laboratory are putting climate models to the test with particular focus on weather extremes.

Researchers believe that some species of Australian fish are growing bigger, much faster, because ocean temperatures are warming up.