More and more researchers are pointing to the sky in search of answers. Not only to understand how clouds change or the balance of the planet, but also to explore ideas that a few years ago sounded almost experimental and today are beginning to be taken into account. In this context, a new proposal arises that mixes observation, technology and a lot of height.
A group of researchers has detected that marine clouds, especially in the northeastern Pacific, are losing some of their ability to reflect sunlight. That natural “glow” that once helped cool the planet is weakening as the atmosphere becomes cleaner.which, paradoxically, allows more solar energy to pass through and accelerates the warming of the oceans.
The study, published in concludes that these clouds have become less reflective between 2003 and 2022, with an average drop in reflectivity of 2.8% per decade. The authors attribute about 69% of this decrease to the reduction of sulfur dioxide and other aerosolsthat is, cleaner air that improves health, but also weakens part of the natural “shield” that previously returned solar radiation to space.
Possible whitening of clouds
Aerosols act as nuclei on which water vapor condenses, that is, when there are many particles, more small droplets are formed and the cloud reflects more light. If these aerosols fall, the droplets grow, the cloud loses brightness and can discharge rain sooner, shortening its useful life.. In this process, clouds lose density and duration, reduce their ability to reflect sunlight and allow more radiation to pass through, which contributes to ocean warming.
Faced with this critical situation, proposals as innovative as those suggested by several researchers from the University of Washington arise. These describe a technique of marine cloud bleaching, that is, spraying seawater into the air to favor the formation of saline particles that make clouds more reflective. The idea is to imitate part of the cooling effect of polluting aerosols, but without emitting the harmful compounds associated with combustion.
“Imagine it like this: harmful polluting particles are replaced by another type of particle that does not pollute, but still has a beneficial cooling effect,” explains Professor Robert Wood in statements collected by . Even so, The authors insist that more research is needed before any implementation and that safety, real effectiveness and possible side effects must be evaluated.
Intervening on clouds implies touching a complex atmospheric system, with regional risks and consequences that are not yet well defined. Therefore, although ideas such as marine cloud bleaching are gaining attention in the scientific debate, The researchers themselves insist that they are still far from becoming a real solution. In this context, research continues, but prudence continues to set the pace.
