Europe, currently experiencing an unprecedented heatwave, stands as the continent with the most accelerated warming globally, extending into an increasingly hotter Arctic region.
Following the shattering of previous May temperature records in Great Britain, Ireland, and France earlier this week, the continent is bracing for continued extreme heat in the days ahead.
This intense heat, typically associated with high summer, is attributed to a “heat dome” — a mass of warm air originating from North Africa, trapped by a high-pressure system situated over Western Europe.
Let’s examine the factors contributing to Europe’s faster rate of warming compared to other regions:
Elevated Temperatures
Globally, temperatures have risen by approximately 1.4 degrees Celsius since the pre-industrial period (defined as 1850-1900).
In contrast, Europe has experienced a temperature increase of about 2.4 degrees Celsius above pre-industrial levels, as reported by the EU’s Copernicus Climate Change Service.
Ben Clarke, a researcher specializing in extreme weather and climate change at Imperial College London, explained to AFP that “nearly all of this warming is driven by human-induced greenhouse gas emissions from burning fossil fuels, with the specific distribution of this excess heat influenced by several factors.”
Altered Atmospheric Patterns
According to Copernicus, modifications in atmospheric circulation patterns have led to a greater frequency and intensity of heatwaves during the European summer.
Carlo Buontempo, Director of Copernicus, noted that high-pressure systems, which are associated with stable weather and elevated temperatures, have become more prevalent across Europe.
“When you consider the last two to three decades, there has been a predominance, particularly in summer, of these anticyclonic conditions that make heatwaves more probable,” Buontempo stated to AFP.
Buontempo further indicated that ongoing scientific discussion seeks to determine whether the increased occurrence of this specific type of high-pressure system is a consequence of climate change or merely a statistical anomaly.
These persistent high-pressure systems are also referred to as “blocking highs” due to their tendency to remain stationary, thereby obstructing the progression of other weather systems into a particular area.
Mary Bourke, a geography professor at Trinity College Dublin, elaborated to AFP on their mechanism: “The sky is clear, without clouds. It represents a stable air mass that pushes warm air downwards toward the surface while displacing moist air, resulting in conditions that are not only warm but also dry.”
Accelerated Arctic Warming
Geographical positioning is another significant contributing factor.
“Europe’s proximity to the Arctic, which is warming at a considerably faster rate than the rest of the planet, plays a crucial role,” observed Clarke.
The Arctic is currently 3.2 degrees Celsius warmer than in the pre-industrial era, according to Copernicus data.
The escalating temperatures in this region are partly attributable to a phenomenon known as albedo feedback.
While reflective snow and ice surfaces return a substantial portion of solar heat to space, their melting exposes darker, heat-absorbing surfaces like land and ocean.
“Consequently, as sea ice melts, it leads to increased heat absorption, which in turn further warms the water and accelerates more ice melt,” Clarke explained.
Diminishing Snow Cover
Buontempo mentioned that in various European locales, the areas that historically experienced frequent winter snow have seen a reduction in their extent.
“Many historical regions that used to experience a week or more of freezing temperatures are now not experiencing them. This means exposed dark land surfaces rather than white snow,” he stated.
Decreased Air Pollution
Stricter air quality mandates have led to a reduction in aerosol emissions since the 1980s.
However, this successful mitigation of pollutants had an unintended consequence of contributing to global warming. These microscopic airborne particles have a cooling effect by reflecting solar radiation and enhancing cloud reflectivity.
“While a reduction in air pollution is immensely beneficial for respiratory health, it also results in an increase in solar radiation reaching the surface, as numerous types of particulate matter scatter sunlight,” Clarke commented.
Varied Warming Rates
The pace of temperature change differs across Europe.
Eastern and southeastern Europe, along with parts of Central Europe including the Alps, have recorded warming rates of 0.5°C to 1°C per decade over the past 30 years, according to Copernicus.
Western and southwestern Europe, as well as sub-Arctic regions in Finland, Norway, and Sweden, have seen warming of 0.2°C to 0.5°C per decade.
Svalbard, a Norwegian Arctic archipelago inhabited by polar bears, has experienced warming of 1.5°C to 2°C per decade.
Among the most rapidly warming locations on Earth, Svalbard registered record high summer temperatures between 2022 and 2024. Last year, it experienced its fourth warmest summer on historical record.
