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2023 defied climate expectations. It wasn’t just hotter than predicted — it was strangely hot. Now, scientists are piecing together what caused this anomaly, raising fresh concerns about Earth’s climate systems.
Gavin Schmidt, NASA’s top climate modeller at the Goddard Institute for Space Science, admitted to feeling “humbled” by 2023’s extraordinary temperatures. Writing in Nature earlier this year, Schmidt noted that the year was warmer than models anticipated. The deviation, unexplained at first, sparked worries that climate change is entering uncharted territory.
At December’s American Geophysical Union (AGU) meeting, the world's largest Earth science conference, experts revisited the mystery. Like detectives solving a case, scientists meticulously ruled out some “suspects” while identifying others.
Key Suspects Behind the Heat Surge
El Niño
The natural El Niño event, which warms the tropical Pacific, began in 2023, contributing to global temperatures. Yet the warming exceeded even El Niño’s usual influence, raising eyebrows.
Cleaner Air from Shipping
New rules to reduce sulphur in ship fuel have lowered pollution levels. However, cleaner air allows more sunlight to reach the ocean surface, which adds to global warming.
Volcano and Solar Activity
The Hunga Tonga eruption in 2022 injected water vapour into the atmosphere but also sulphates, which slightly cooled the Earth. Meanwhile, the Sun reached its peak activity cycle, contributing minimal extra heat.
Cloud Cover Changes
Research by Germany’s Alfred Wegener Institute found Earth reflected less sunlight in 2023 — its dimmest year yet. Reduced cloud cover, particularly over northern mid-latitudes, amplified warming. Cleaner air may have played a role, alongside long-term climate shifts that are altering cloud patterns.
The Bigger Picture
Global warming is accelerating. Some scientists argue that the drop in sulphur emissions is now speeding up heating, while changing cloud dynamics add to the uncertainty.
What’s Next
GISS modellers are now combining the latest data on sulphur emissions, cloud dynamics, and sunlight reflectivity into updated climate simulations. Schmidt expects these runs to clarify the contributions of various factors and potentially reshape projections for Earth’s future.
The findings are clear: warming is unlikely to slow any time soon.
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