UK coastal waters are experiencing record-breaking temperatures, up to 4°C above average, in what experts call a “super intense” marine heatwave — a possible harbinger of extreme summer weather ahead.
Scientists are sounding the alarm as parts of the North Sea, English Channel, and Irish coast register unusually high sea surface temperatures, with some areas recording heat levels not seen since monitoring began 45 years ago.
According to the UK Met Office, this marine heatwave — which has lasted more than two months — is significantly longer and more severe than average marine heatwaves, which typically last around two weeks. Researchers warn this could signal a prolonged period of extreme weather, both at sea and on land.
Dr. Ségolène Berthou, a Met Office climate expert, noted that sea temperatures had already been trending warmer before this spring’s exceptional weather began, making the current spike more alarming.
Scientists attribute the unusual heat in part to the UK’s exceptionally warm, dry spring. A persistent high-pressure system has created a “blocked” weather pattern, reducing winds and rainfall while allowing solar heat to accumulate on the ocean surface.
Environmental and Ecological Risks
The marine heatwave poses serious risks to marine ecosystems, potentially disrupting breeding cycles, encouraging harmful algal blooms, and attracting invasive species like jellyfish. The BBC reported a 32% rise in jellyfish sightings off UK shores following similar heat anomalies.
Though sea temperatures have not yet reached levels causing mass marine die-offs, experts warn that continued warming could tip fragile ecosystems past critical thresholds.
A Broader Warning
Researchers emphasize that marine heatwaves are expected to become more frequent and intense due to climate change. With the UK already experiencing one of its warmest and driest springs in over a century, scientists believe the ocean’s extreme conditions could be an early warning sign of a record-hot summer.
As Britain heads into the peak summer months, researchers are closely monitoring both land and sea temperatures, warning that continued inaction on climate resilience could leave communities and ecosystems increasingly vulnerable.
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