Over 90 per cent of the heat trapped in the climate system by increasing greenhouse gas concentrations from our burning of fossil fuels is stored in the oceans. With much less variability than surface temperatures, ocean warming is one of the most important indicators of the ongoing pace of climate change.

Two new studies published last week confirm the world’s oceans are warming. The first,

published in the Proceedings of the National Academy of Science, shows that ocean warming has accelerated since 1870. The second, a perspective published in the prestigious iournal Science, reports studies that indicate the rate of ocean warming over recent decades is 10 per cent or more greater than the studies considered in the last Intergovernmental Panel on Climate Change Assessment published in 2013, and that the rate has increased since 1991.

Broken sea ice emerges from under the hull of a Finnish icebreaker as it traverses the Arctic's Northwest Passage. Credit:AP

The updated observations are in agreement with the results of climate model simulations of the impacts of our continuing release of greenhouse gases. These models show the ocean will continue to warm through the 21st century and beyond.

Greenhouse gases have a long life time in the atmosphere. Even if carbon dioxide emissions were to cease completely, atmospheric concentrations would only decrease slowly over thousands of years unless we discover a way to artificially remove them from the atmosphere.As a direct consequence, surface temperatures would remain elevated. As result of the oceans’ ability to store heat, they will continue to warm for centuries.