World’s Oceans Have Absorbed 90 Percent Of Energy From Climate Change In Last 150 Years

Greenhouse gas emissions give off energy in the Earth system, in turn increasing ocean temperatures associated with sea level rise and moderately warming the surface. Petrmalinak/Shutterstock

Madison Dapcevich 09 Jan 2019, 23:05

A century and a half of reconstructed data is helping scientists paint a picture of how much energy the world’s oceans are absorbing from human-made greenhouse gas emissions (GHG) and, as a result, how temperatures have changed since the 19th century. Estimates suggest that from 1871 until now, global warming of our oceans is at 436 x 10^21 Joules, which, if you’re not a physics buff, is roughly 1,000 times the amount of energy used by humans every year.

The Guardian reports that its staff crunched the numbers and found that the “average heating across that 150-year period was equivalent to about 1.5 Hiroshima-size atomic bombs per second.” They say that figure has accelerated over time as emissions continue to rise, now equaling between three and six atomic bombs per second.

IFLScience reached out to study author Laure Zanna for her take on the analogy. She said, "we prefer to avoid this analogy and favor a comparison between the heat absorbed by oceans and annual human energy consumption, or how many cups of tea one can make that amount of heat." (It's unclear exactly how many cups that equates to.)

“But obviously, we are putting a lot of excess energy into the climate system and a lot of that ends up in the ocean. There is no doubt,” she added. Prior to now, a lack of records has limited researchers in their ability to estimate historic temperature fluctuations in oceans around the world. Now, researchers have employed a new method that takes on a mathematical approach.

Cumulative heat uptake from 1871 to 2017 (joules per year) shown for each patch contributing to the storage of heat (A) globally and (B) in the Atlantic Ocean. (Note the different scales for the two panels). Proceedings of the National Academy of Sciences
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