Even NASA didn't see it coming: a sudden ocean shift could change everything - Futura-Sciences
While rising sea levels are no longer surprising, what happened in 2024 caught even scientists off guard: NASA recently reported an ‘unexpected’ surge, triggered by a major shift in ocean patterns.
NASA had predicted a sea level rise of 0.43 centimeters (about 0.17 inches) for 2024, but the actual increase was 0.59 cm (about 0.23 inches). That might not sound like much, but the difference is significant and initially puzzling. These forecasts, based on data from five satellites, are usually very accurate with minimal error.
The ocean’s unexpected disruption
Typically, about two-thirds of sea level rise is caused by melting glaciers, but that trend appears to have shifted last year. This time, the increase was mainly driven by thermal expansion—warm water expanding because it’s less dense than cold water.
What’s driving this change? Record ocean warming in 2024. Normally, warmer water stays near the surface, but atmospheric warming is stirring things up: stronger storms and cyclones are mixing the waters, pushing warm water deeper into the ocean. This mixing not only raises sea levels but also causes saltwater intrusion into major rivers like the Ganges.
Real-world impacts on society
The effects of warming oceans are far-reaching and carry serious consequences for human society. Marine heatwaves are devastating marine life, threatening food supplies for many communities. Rising sea levels are reducing access to freshwater and fueling more frequent and intense coastal flooding.
This change in the oceans is more than a scientific anomaly—it’s a shift that could reshape the way we live.
Karine Durand
Specialist for extreme weather and environment
A specialist in extreme weather phenomena and environmental issues, this journalist and TV host has been explaining climate topics since 2009. With over 15 years of experience in both French and American media, she is also an international speaker.
Trained in communication and environmental sciences, primarily in the United States, she shares her passion for vast natural landscapes and the impacts of climate change through her work on biodiversity and land management.
Marie Pireddu
Marie Pireddu is a French-English translator specializing in digital marketing, technology, and mobile apps. She is also a business English trainer for professional adults, helping clients master English for international business, with a focus on American culture and corporate communication.