Last year wasn't just one of the hottest years on Earth's surface, as it was the hottest year on record for the global ocean, according to a new study from the Institute of Atmospheric Physics (IAP)/Chinese Academy of Science.
Researchers Lijing Cheng and Jiang Zhu found that the top 2,000 meters of ocean waters are hotter than ever recorded, at 19.19 × 10^22 J. Heat energy is measured in Joules (J).
The United Nations announced Thursday that 2017 was the hottest year on record without an El Niño event kicking up global annual temperatures.
Last year's average surface temperatures—driven by carbon dioxide and other greenhouse gas emissions—was 1.1 degree Celsius above pre-industrial times, putting the world on course to breach the internationally agreed "1.5°C" temperature barrier to avoid dangerous climate change set by the 2015 Paris climate agreement.