THE GUARDIAN
Global temperatures soared to a new record in September by a huge margin, stunning scientists and leading one to describe it as “absolutely gobsmackingly bananas”.
The hottest September on record follows the hottest August and hottest July, with the latter being the hottest month ever recorded. The high temperatures have driven heatwaves and wildfires across the world.
September 2023 beat the previous record for that month by 0.5C, the largest jump in temperature ever seen. September was about 1.8C warmer than pre-industrial levels. Datasets from European and Japanese scientists confirm the leap.
The heat is the result of the continuing high levels of carbon dioxide emissions combined with a rapid flip of the planet’s biggest natural climate phenomenon, El Niño. The previous three years saw La Niña conditions in the Pacific Ocean, which lowers global temperature by a few tenths of a degree as more heat is stored in the ocean.
Conditions have now rebounded to an El Niño event, which releases ocean heat and drives up temperatures. It’s all but certain that 2023 will be the hottest on record and 2024 may even exceed that, as the heating impact of El Niño is felt most in the year after it begins.
“September was, in my professional opinion as a climate scientist, absolutely gobsmackingly bananas,” said Zeke Hausfather, at the Berkeley Earth climate data project.
The first global temperature data is in for the full month of September. This month was, in my professional opinion as a climate scientist – absolutely gobsmackingly bananas. JRA-55 beat the prior monthly record by over 0.5C, and was around 1.8C warmer than preindutrial levels. pic.twitter.com/mgg3rcR2xZ— Zeke Hausfather (@hausfath) October 3, 2023
Mika Rantanen, climate researcher at the Finnish Meteorological Institute, said: “I’m still struggling to comprehend how a single year can jump so much compared to previous years.” Prof Ed Hawkins, at the University of Reading, UK, said the heat seen this summer was “extraordinary”.
ERA5 September 2023 monthly data are out.
I’m still struggling to comprehend how a single year can jump so much compared to previous years.
Just by adding the latest data point, the linear warming trend since 1979 increased by 10%. pic.twitter.com/AnNAbyUQwY— Mika Rantanen (@mikarantane) October 3, 2023
Samantha Burgess, at the EU’s Copernicus Climate Change Service, said: “The unprecedented temperatures for the time of year observed in September have broken records by an extraordinary amount. 2023 [is] on track to be the warmest year and about 1.4C above pre-industrial average temperatures. Two months out from [the UN climate conference] Cop28, the sense of urgency for ambitious climate action has never been more critical.”
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