This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: New research from the University of California, Santa Cruz, in collaboration with other institutions, highlights the fragmented and staggered timing of warming increases across the planet, providing a nuanced perspective on the debate over global-warming acceleration. The new study is published in Nature Communications and authored by researchers at UC Santa Cruz, Clemson University and the NOAA Geophysical Fluid Dynamics Laboratory.
The research team analyzed multiple surface-temperature observational data sets from 1970 to 2024 and used advanced statistical modeling to identify coherent spatial and temporal patterns in shifts in warming rates. A key finding: The most recent accelerations are prominent in regions of the Northern Hemisphere's midlatitudes, such as southeast China and the Gulf of Mexico. "What we wanted to do is provide a clearer, region-by-region picture of where warming is actually accelerating—and when it began," said lead author Claudie Beaulieu, associate professor of ocean sciences at UC Santa Cruz.
"Our study shows that regional speedups have emerged in distinct waves, with onset timings ranging from the 1980s through the 2010s depending on the geographical area." This study extends previous work by members of the team that assesses whether an acceleration is detected in global mean temperature. Regional analysis, however, provides a more nuanced picture. In addition to southeast China and Mexico, the team found other regions with recent accelerated warming, including the eastern Mediterranean, Bolivia, the North Pacific and New Zealand.
While the study focuses on statistically mapping these regional shifts, localized drivers—such as regional aerosol pollution reductions—may play a role in some, but not all, of these speedups. The timings detected by the team are consistent with declining sulfur dioxide emissions from coal-fired power plants in China. The researchers emphasize that pinpointing the physical mechanisms behind every regional speedup requires further study.
"Fitting our models at each grid point allows us to identify regions with similar warming behavior," said co-author Rebecca Killick, professor of statistics at Clemson University and honorary professor at Lancaster University. "This is important for local communities to understand how increased warming will have local impacts." A key impact of warming accelerations is the shifting baseline for the frequency and severity of extreme events such as heat waves. While continued steady warming alone causes a shifting baseline, any increase in the rate of warming can lead to a disproportionate increase in the likelihood of record-breaking events.
Identifying the specific regions and timings of warming shifts provides crucial context for regional climate impact assessments, adaptation strategies and environmental planning, the researchers say. They emphasize that regions with large populations and low socioeconomic development are especially vulnerable to accelerated warming and the accompanying changes in temperature extremes. Similarly, ecosystems are often more sensitive to rapid temperature shifts than gradual changes.
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