The concept of Marine Cloud Brightening revolves around the idea that by making clouds brighter or whiter, more sunlight is reflected back into space. This ultimately helps reduce the amount of heat absorbed by Earth’s atmosphere and offers a respite from the effects of increased carbon emissions.
Clouds in marine environments are believed to benefit the most from such brightening efforts. But how exactly does one go about brightening clouds, and does it work as effectively as theorized?
Scientists primarily suggest spraying aerosols, such as fine sea salt particles, to brighten clouds. These aerosols act as “condensation nuclei” within the clouds, promoting water vapor to form more liquid droplets and creating denser, brighter clouds. A similar effect can be seen with pollution particles.
However, the challenge lies in ensuring the particles sprayed are of the right size to effectively brighten the clouds at the appropriate time. Additionally, achieving significant sunlight reflection requires scaling up the operation sufficiently. There is also the concern of unforeseen impacts on clouds and climate.
Current research efforts mainly involve small-scale experiments and computer simulations, though some real-world studies have raised questions. For instance, a bright cloud experiment in Arameda, California was halted in May following warnings from local authorities reported in the media.
Experts have suggested that useful insights can be gleaned from “natural” experiments as well. Observations near the Kilauea volcano in Hawaii showed that aerosols generated naturally during the eruption led to a 50% increase in cloud cover. 。
Ultimately, the decision on whether to pursue large-scale marine cloud brightening rests with policymakers, who require convincing evidence. As scientific understanding and the climate crisis evolve, attitudes may shift.
This article addresses the question (I asked from Besariany Shepherd, Derbyshire) “Is Marine Cloud Brightening useful for fighting climate change?”
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Source: www.sciencefocus.com
