Scientists Link Climate Change to Worsened Spanish Floods

Although researchers generally hesitate to attribute individual extreme weather occurrences directly to climate change, they have promptly highlighted how elevated temperatures contributed to exacerbating the floods in Spain. Dr Friederike Otto, from Imperial College London, who heads an international scientific team investigating the influence of warming on such events, stated, “No doubt about it, these explosive downpours were intensified by climate change.” She further explained, “With every fraction of a degree of fossil fuel warming, the atmosphere can hold more moisture, leading to heavier bursts of rainfall.” According to meteorologists, the primary probable cause of the heavy precipitation was a natural meteorological phenomenon common in Spain during Autumn and Winter. This event, known as a “gota fría” or cold drop, involves cold air moving down over the Mediterranean Sea’s warmer waters, an area that has recorded exceptionally high temperatures in recent years. Subsequently, the warm, moist air at the sea’s surface rapidly ascends, forming large, towering clouds that are carried inland and release significant volumes of rain. Scientists indicate that climate change directly influenced the quantity of rain these clouds contained, increasing it by 7% for each 1C degree of warming. Once precipitation begins, it falls with greater force onto ground that is less capable of absorbing substantial water volumes. Prof Mark Smith, from the University of Leeds, noted, “As well as increased rainfall extremes, we are seeing hotter summer which can bake the soil and reduce its ability to absorb water.” He added, “In turn this amplifies the more direct effects of increased rainfall intensities as more of that water makes it into the rivers.” Furthermore, scientific discussion exists regarding whether a warmer global climate contributes to these storms moving more slowly, thereby intensifying the volume of rainfall they release. This year has provided instances of such storm types and the destruction they can cause. For example, in September, Storm Boris caused fatalities and damage across multiple Central European nations, its intensity again amplified by the elevated temperatures in the Mediterranean. Scientists indicated that climate change doubled the probability of this slow-moving catastrophic event. In Spain, the absence of accurate warnings has drawn criticism, suggesting that additional preventative measures might have been possible. However, meteorologists contend that forecasting the trajectory of rapidly moving, severe thunderstorms presents a significant challenge. Dr Linda Speight from the University of Oxford stated, “Warnings can be a lifesaver in helping people to seek higher ground and safety before a flood. But as we have seen in Spain today, it is incredibly hard to issue warnings for intense thunderstorms because the exact location of the heaviest rainfall is often not known in advance.” She concluded, “Forecasters and scientists are working hard on innovative solutions to this challenge, it’s not going to be an easy problem to crack.” The flooding in Spain has underscored a problem: the current infrastructure’s inadequacy in handling extreme flood occurrences. Certain researchers have pointed out that existing roads, bridges, and streets were constructed for the climate of the previous century, not the present one. For exclusive insights into the latest climate and environment news from the BBC’s Climate Editor Justin Rowlatt, delivered weekly to your inbox, sign up for our Future Earth newsletter. If you are outside the UK, you can subscribe to our international newsletter here. Copyright 2024 BBC. All rights reserved. The BBC is not responsible for the content of external sites. Read about our approach to external linking.