Extreme heat impacts in coastal areas and marine heatwaves

As the planet continues to warm, marine heat waves are growing longer and deadlier, hurting the seafood supply that billions of people worldwide rely on for their food and livelihoods.

Tropical cyclones that rapidly intensify when passing over marine heatwaves can become “supercharged”, increasing the likelihood of high economic losses, a new study finds.

In this study, a multi-layered spatiotemporal analysis of sea surface temperature (SST) changes in the Aegean Sea for the 2008–2024 period was conducted to establish a scientific basis for regional adaptation strategies.

Unusually warm ocean waters can amplify extreme rainfall in downwind areas, leaving coastal communities—especially those in developing countries—at risk.

Extreme 2019 Indian Ocean Dipole drove record marine heatwaves in the Arabian Sea, creating deep warm layers that fueled a rapid series of intense cyclones. Rising global temperatures may make such events far more frequent.

Researchers found the unprecedented 2023 East Asian marine heat wave increased land temperatures and humidity by up to 50%.

Earlier this year, a spate of deaths in Florida caused by a flesh-eating bacteria, made headlines. Infections of this kind are on the rise as ocean temperatures surge higher and marine heat waves increase in frequency and intensity due to climate change.

Severe ‘blob’ or marine heatwave can lead to increased inundation and wintery weather in eastern North America.

A record 2023 North Atlantic marine heatwave was driven by weak winds, shallow mixed layers, and climate change-induced ocean warming. These amplified feedbacks caused widespread sea temperature spikes, influencing European weather and marine ecosystems.

Heatwaves exist not only on land, but also in oceans.