The UK is currently enduring yet another intense heatwave, leaving many residents perplexed as to why these sweltering days feel more unbearable than those in other countries.
Despite receiving the same intense sunlight and facing rising global temperatures, the UK’s heat is perceived differently. Many are questioning if there’s more to the discomfort than just the numbers on a thermometer.
While temperatures in the UK soar to around 34 degrees Celsius, this is often viewed curiously by the rest of the world. This perspective is compounded by climate change-induced wildfires anticipated in parts of the United States and Europe. However, the situation is more complex than it seems.
Before dismissing this as mere British complaining, consider this: research indicates it’s often worse than it feels.
Professor Hannah Cloke, a climate expert, explains in BBC Science Focus: “Heatwaves are, in many ways, subjective events. What defines a heatwave varies globally, depending on the average conditions people expect.”
“While 32°C feels extremely hot in the UK, it’s a common temperature in places like New York. Individuals often focus on the daytime maximum temperatures when assessing heat,” the professor adds.
There’s Something in the Air
One might notice that England is an island, surrounded by water. While many assume this proximity to cold water offers a cool respite, it paradoxically contributes to discomfort.
According to Dr. Matthew Patterson, a meteorologist, “The UK’s climate is relatively humid compared to many other European nations because of the surrounding sea and prevailing south-westerly winds that carry moist air over the land.”
Our bodies cool down through radiation, conduction, convection, and evaporation. The first three processes rely on the temperature difference between your body and the air. As the air warms up and you begin to sweat, these methods of cooling become less effective.
“Sweating helps lower your body temperature as energy escapes due to water evaporation; however, if the air is already humid, sweating becomes less efficient,” Patterson explains. Wind speed can enhance evaporation by carrying moisture away from the skin.
Mr. Croke also noted, “Weather services measure the combined effects of temperature, humidity, and wind on the human body, often using the ‘feel-like temperature’ or indicators like the Global Heat and Climatic Index (UTCI).”
“Two regions with the same temperature might not feel the same; one could cause discomfort while the other is tolerable. The UTCI helps policymakers predict where and when heatwave impacts will be most felt.”
British Homes: Not Fit for Purpose
A significant factor exacerbating the British discomfort in the heat is the design of homes. Anyone riding the London Underground in summer can attest to the design flaws in heat resistance.
“Most UK homes lack air conditioning as standard due to the climate’s mildness for most of the year,” Croke explains. However, this oversight presents problems during heatwaves.
UK government data from 2022 shows that one in six homes in England and one in five in Wales were built before 1900. Conversely, only 7% and 5% were constructed after 2012.
This data indicates that many UK homes were not designed with modern climate challenges, including heatwaves, in mind.
Patterson notes, “Many homes are built to maximize sunlight, which can lead to heat accumulation during the day. In contrast, homes in Europe and America often feature external shutters that effectively block heat.”
This relic of a cooler climate indicates a pressing need for change as the UK’s temperatures are projected to rise in the coming decades. Notably, four of the five hottest days recorded in the UK occurred after 2020, with temperatures exceeding 40°C for the first time in 2022, according to Met Office data.
“A lack of understanding about how to keep homes cool exacerbates the issue. Many remain unaware of how to cope during extreme heat,” Cloke remarks.
“As a society, we’re largely unprepared for the rising temperatures, and future climate change will likely lead to longer, more severe heat periods in the UK. But, we do love to complain about the weather, don’t we?”
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Source: www.sciencefocus.com