Cleaner Air May Lead to Hotter European Summers, Study Finds

European summers are experiencing unprecedented heat, and a new study reveals a surprising factor: cleaner air might be contributing to the warming trend. Beyond greenhouse gases, the reduction in aerosol pollution is altering atmospheric circulation patterns, leading to hotter summers.

A study published in Geophysical Research Letters indicates that Western Europe's average summer temperature has risen by approximately 2.3 degrees Celsius since 1980. Globally, the average increase was about 0.8 degrees Celsius during the same period. This significant difference prompted researchers to seek additional explanations, as climate models had not fully anticipated Europe's accelerated warming.

The study's authors explain that the decrease in sulfate aerosol emissions, a result of anti-pollution measures, has had an unexpected side effect. For decades, these particles, primarily from coal-fired power plants and industrial facilities, reflected some solar radiation, thus limiting atmospheric warming. With their reduction, more solar energy reaches the Earth's surface, accelerating summer temperature increases. Researchers estimate that aerosols previously masked over one degree Celsius of European summer warming.

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Timp de decenii, aceste particule provenite în special din centrale pe cărbune și instalații industriale au reflectat o parte din radiația solară și au limitat încălzirea atmosferei.

This reduction in aerosols has not only affected temperature but also atmospheric circulation. The analysis points to an increase in the frequency of nearly stationary Rossby waves, large-scale atmospheric formations that can trap warm air masses over the continent for extended periods. This phenomenon favors persistent heatwaves, creating a "heat dome" effect. To reach this conclusion, scientists compared recent climate observations with numerous computer simulations, analyzing the separate effects of greenhouse gases and aerosols.

While climate models accurately captured the impact of greenhouse gases, they underestimated the influence of changes in atmospheric circulation. Observational data show these modifications amplified European summer warming by approximately 29%. The researchers suggest that adjusting models to more accurately reflect the intensity of Rossby waves brought their summer temperature estimates closer to observed reality. The study emphasizes that improving air quality remains a crucial public health gain and does not negate the necessity of reducing pollution.

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Odată cu reducerea lor, mai multă energie solară a ajuns la suprafața Pământului, ceea ce a dus la o creștere mai rapidă a temperaturilor în timpul verii.