- Researchers have published a new study indicating that artificially brightening marine clouds over the Pacific could potentially reduce the intensity of El Niño, although they caution that the technology is unproven and carries risks.
- The study, published in Science Advances, utilized computer simulations to demonstrate that brightening clouds over the Pacific could mitigate the effects of El Niño when implemented at the right time.
- Lead author Jessica Wan from the University of Chicago emphasized that while the concept is promising, the technology isn't ready for real-world application, as current nozzle designs cannot deliver the necessary volume of seawater.
- The study suggests that deploying the technique early in the El Niño cycle could significantly reduce its impacts, with simulations indicating that it could have halved the warming effects during past super El Niño events.
- Geoengineering has been a controversial topic, with critics arguing it could create a moral hazard by allowing continued pollution if climate impacts can be artificially mitigated.
- The researchers noted that while the technique could limit damage from El Niño, it might also lead to unintended consequences, such as warming in other regions like Europe and Asia.
- Short-term geoengineering like marine cloud brightening could be a temporary solution to mitigate the severe impacts of El Niño while longer-term climate solutions are developed.
A new study published in Science Advances indicates that marine cloud brightening could significantly reduce the impacts of El Niño, a weather phenomenon known for causing extreme weather and economic disruption. Researchers utilized computer simulations to demonstrate that this geoengineering technique could effectively cool the Pacific Ocean and mitigate El Niño's effects.1256
The study's lead author, Jessica Wan, a postdoctoral researcher at the University of Chicago, explained that the method involves spraying seawater into the atmosphere to enhance cloud reflectivity. This could theoretically be achieved by using ships equipped with nozzles to spray sea salt into the lower atmosphere. However, Wan cautioned that “the technology isn't yet ready” and that it would require approximately 2,400 ships to make a significant impact.
The simulations revealed that initiating the cloud brightening process early, ideally in June, could reverse many of El Niño's temperature and precipitation effects. For instance, the modeled intervention could have reduced the warming of the Niño 3.4 region from over 2°C to just above 1°C during past super El Niño events.
Despite its potential, the study also highlighted significant risks, including unintended consequences such as warming in Europe and Asia. Critics of geoengineering argue it could create a moral hazard, allowing continued pollution under the guise of technological fixes. Wan, however, believes that “we’re locked into warming already” and that geoengineering could help mitigate the worst impacts while long-term solutions are developed.
The research underscores the need for further investigation into the viability and ethical implications of marine cloud brightening as a tool to combat climate change.
“Computer simulations showed cloud brightening could reduce El Niño's temperature and precipitation effects by up to 40%, but it would require roughly 2,400 ships spraying seawater — a scale not possible with current nozzle technology. Lead author Jessica Wan says the approach aims to reduce worst impacts while long-term solutions are pursued.”
New Scientist
