China’s massive push to reduce air pollution has had an unexpected effect on the Arctic

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China’s drastic reduction in air pollution may have had unexpected benefits in the Arctic: A new study shows that it reduced storms caused by aerosols and, in turn, reduced the loss of sea ice. However, at the same time, this large drop in aerosols may accelerate global warming, experts say.

“Chinese people suffered from evil spirits for decades,” Bjorn Samsetsenior researcher at the CICERO Center for International Climate Research in Norway, told Live Science. “This pollution temporarily reduced global warming and gave everyone else more time to adapt to a warming climate. What is happening now is that we are seeing the full effects of global warming, which sooner or later we will have to face.”

In late January 2019, wind patterns over the North Pacific changed, and a series of five powerful hurricanes quickly swept through the Bering Sea. Each drove warm winds from the south across the ice, breaking it up and pushing it north. Air temperatures across the northern Bering Sea were 21.6 to 28.8 degrees Fahrenheit (12 to 16 degrees Celsius) above normal. By early March, the ice cover had shrunk by 82%. This represented a return of approximately 154,440 square miles (400,000 square kilometers) – the largest decline ever recorded by satellites at that time of year.

Scientists have long known that hurricanes can destroy Arctic sea ice. What they weren’t sure about was what sent those storms in the first place.

The new study, published on March 18 in the journal npj Climate and Atmospheric Sciencesoffers an unexpected answer: From 2000 to 2014, smoke from Chinese waters may have been driving winter storms northward across the North Pacific, some of which crossed the Arctic and destroyed ice in the Bering Sea.

To understand how soot and sulfate particles on the surface of Shanghai can affect the ice on the coast of Alaska, it helps to think about what happens in a storm. Every mid-latitude hurricane — the rotating, coma-shaped systems that produce most of the Northern Hemisphere’s winter weather — runs on a kind of heat engine. The warm, moist air evaporates near the surface of the ocean, rises and becomes clouds, releasing heat that fuels the storm cycle.

Aerosols – the tiny particles that make up industrial smog – damage this engine in a subtle but important way. Water vapor often condenses around a relatively small number of particles, forming large droplets that fall quickly as rain on the southern side of the storm. If the air is full of aerosols, however, each particle becomes a seed for a cloud drop. The result is a large number of small droplets that do not easily coalesce into raindrops. The rain on the south side of the storm is compressed, and the moisture continues past the storm’s conveyor belt to its northeast side, where it releases its heat – in exactly the right place to push the entire system.

The main writer Dianbin Cao. Comparing 14 years of high aerosol flow between 2000 and 2014 against 15 years of low aerosol flow from previous decades, the researchers found that hurricane tracks shifted north by 1.23 degrees during the time the storms disappeared — twice the number of hurricanes crossing the Arctic.

This aerosol-driven activity on the storm’s surface is “stronger than I thought,” he said. Alex Crawfordan Arctic climate scientist at the University of Manitoba who studies the interaction of ice, hurricanes and the ocean but does not participate in the study. “They did a really good job of showing the mechanism by which aerosols can affect tropical cyclones.”

When these storms reach the Bering Sea, their effects can be dramatic. Clockwise hurricane winds are pushing ice back into the Chukchi Sea, between Alaska and Russia. The waves break through the ice. Cyclones from the south bring warm air that, even in deep winter, is hotter than cold, as happened badly in 2019.

However, there is a potential silver lining. China’s air pollution cleanuplaunched in 2013, it has proven to be one of the most effective environmental measures in history, reducing the country’s sulfate aerosol gas by about 75% in about ten years. The study suggests that this reduction “could reduce the migration of storms driven by global warming” – saving the Arctic some of the damage caused by foreign hurricanes.

But the big picture is more complicated. Aerosols too cool the planet by reflecting the sun’s rays back into space and by making the clouds brighter. As they disappear, their cooling effects also disappear, thus exposing decades of greenhouse gas warming. A Education 2025 led by Samset, who was not involved in the new study, found that reductions in East Asian aerosols have moderately accelerated global warming.

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The same reductions in aerosols that can ease hurricane pressure in the Bering Sea simultaneously reveal the full effects of global warming.

What this climate battle will mean for Arctic sea ice remains to be seen, however Dan WesterveltAtmospheric scientist at Columbia University Lamont-Doherty Earth Observatory and co-author of the 2025 Samset study, thinks that the effect of warming will win. “Water warming may dominate, as it is more persistent and may occur in all seasons, while storm surges may be more frequent,” he told Live Science.

Westervelt said the study shows that aerosols have a greater and more complex influence on Earth’s climate than previously appreciated. “The pace of aerosol reduction in East Asia is underappreciated,” he said. “Decreasing temperatures has taken three decades in North America and Europe and ten years in East Asia. What effect this has on hurricanes and Arctic warming will be very interesting to study, and important for climate mitigation and adaptation.”