Skip to main content

World Oceans warming faster than expected, setting heat record in 2018, scientists say

In an undated photo provided by researchers, the French research ship Pourquoi Pas deploys a sensor as part of the Argo project to monitor ocean temperatures.

Olivier Dugornay/The New York Times News Service

The oceans are warming faster than previously estimated, setting a new temperature record in 2018 in a trend that is damaging marine life, scientists said on Thursday.

New measurements, aided by an international network of 3,900 floats deployed in the oceans since 2000, showed more warming since 1971 than calculated by the latest UN assessment of climate change in 2013, they said.

And “observational records of ocean heat content show that ocean warming is accelerating,” the authors in China and the United States wrote in the journal Science of ocean waters down to a depth of 2,000 metres.

Story continues below advertisement

Man-made greenhouse gas emissions are warming the atmosphere, according to the overwhelming majority of climate scientists, and a large part of the heat gets absorbed by the oceans. That in turn is forcing fish to flee to cooler waters.

“Global warming is here, and has major consequences already. There is no doubt, none!” the authors wrote in a statement.

Almost 200 countries plan to phase out fossil fuels this century under the 2015 Paris climate agreement to limit warming. U.S. President Donald Trump, who wants to promote U.S. fossil fuels, plans to pull out of the pact in 2020.

Data due for publication next week will show “2018 was the warmest year on record for the global ocean, surpassing 2017,” said lead author Lijing Cheng, of the Institute of Atmospheric Physics at the Chinese Academy of Sciences.

He told Reuters that records for ocean warming had been broken almost yearly since 2000.

Over all, temperatures in oceans down to 2,000 metres rose about 0.1 degree C from 1971-2010, he said. The 2013 UN assessment estimated slower rates of heat uptake but did not give a single comparable number.

A separate study on Monday, by the European Union’s Copernicus Climate Change Service, said 2018 was the fourth warmest year for global surface temperatures in records dating back to the 19th century.

Story continues below advertisement

Ocean temperatures are less influenced by year-to-year variations in the weather. It can take more than 1,000 years for deep ocean temperatures to adjust to changes at the surface.

“The deep ocean reflects the climate of the deep and uncertain past,” Kevin Trenberth, of the U.S. National Center for Atmospheric Research and a co-author of Thursday’s study, told Reuters.

Among effects, extra warmth can reduce oxygen in the oceans and damages coral reefs that are nurseries for fish, the scientists said. Warmer seas release more moisture that can stoke more powerful storms.

Warmer ocean water also raises sea levels by melting ice, including around the edges of Antarctica and Greenland.

Report an error
Due to technical reasons, we have temporarily removed commenting from our articles. We hope to have this fixed soon. Thank you for your patience. If you are looking to give feedback on our new site, please send it along to feedback@globeandmail.com. If you want to write a letter to the editor, please forward to letters@globeandmail.com.

Welcome to The Globe and Mail’s comment community. This is a space where subscribers can engage with each other and Globe staff. Non-subscribers can read and sort comments but will not be able to engage with them in any way. Click here to subscribe.

If you would like to write a letter to the editor, please forward it to letters@globeandmail.com. Readers can also interact with The Globe on Facebook and Twitter .

Welcome to The Globe and Mail’s comment community. This is a space where subscribers can engage with each other and Globe staff. Non-subscribers can read and sort comments but will not be able to engage with them in any way. Click here to subscribe.

If you would like to write a letter to the editor, please forward it to letters@globeandmail.com. Readers can also interact with The Globe on Facebook and Twitter .

Discussion loading ...

Cannabis pro newsletter