Every year, like clockwork, powerful winds sweep across Panama’s Pacific coast between December and April. These strong winds stir the ocean in a way that keeps coastal life thriving.
But in 2025, that clockwork stopped.
For the first time in at least 40 years of recorded observation, a critical ocean process failed to occur, and researchers are now asking what it means for the future.
HOW DID THE OCEAN CHANGE?
The process in question is called upwelling, and it is, in simple terms, the ocean’s way of bringing a nutritious meal to the surface.
Strong northern trade winds during Central America’s dry season push surface waters aside, allowing colder, nutrient-rich water from the deep to rise up.
This natural pump fuels the fish populations that coastal communities depend on, protects coral reefs from overheating, and keeps Panama’s Pacific beaches cool during the peak tourist season.
For scientists at the Smithsonian Tropical Research Institute (STRI), tracking this annual event has been routine for decades. Their records show that from January to April, the upwelling has been a reliable and predictable feature of the Gulf of Panama for at least 40 years.
Until now.
MISSING AFTER 40 YEARS
That reliability came to an abrupt end last year.
In 2025, researchers documented something they had never seen before; the seasonal upwelling did not occur. The usual coastal cooling was weakened, and the expected rise in ocean productivity was also reduced.
The worrying findings were published in the journal PNAS, and point to a significant weakening of wind patterns as the most likely cause of the failure.
The findings also show how quickly climate disruption can interfere with basic ocean processes that have supported coastal fishing communities for thousands of years.
However, researchers caution that additional study is needed to pinpoint the exact cause and assess the full impact on fisheries and marine ecosystems.
Beyond Panama, the event, or lack thereof, has rung an alarm for oceans around the world.
The discovery points to the rising vulnerability of tropical upwelling systems, which are enormously important for ecosystems and coastal economies, yet poorly monitored in many parts of the world.
Scientists say the findings make a strong case for expanding ocean observation and climate forecasting across tropical regions.
One missed season may seem isolated, but in a warming world, what was once a rare anomaly could become a troubling new pattern, and add yet another thing to worry about.
