Researchers investigated a methodology to attenuate the impacts of El Niño before this climate phenomenon intensifies. The approach involves the artificial brightening of clouds in the Pacific Ocean, aiming to increase the reflection of sunlight; however, the models themselves indicate potential undesirable outcomes.
This study, published in the journal Science Advances, examines a geoengineering alternative capable of reducing extreme occurrences linked to El Niño, although the practical implementation of this technology is still distant.
Simulations demonstrate the attempt to contain El Niño
El Niño occurs when the waters of the eastern tropical Pacific warm up, causing changes in weather patterns across various regions of the globe, which manifests as alterations in rainfall, drought periods, and global temperatures.
The investigation, conducted by Jessica Wan, a postdoctoral researcher at the University of Chicago, analyzed two historical periods: the 1997–1998 and 2015–2016 events. For this purpose, the team employed computational models capable of simulating how an artificial intervention could influence the climate.
The premise is to disperse sea salt particles into the atmosphere using vessels equipped with specialized nozzles. These particles would help increase the brightness of the clouds, resulting in the return of a larger portion of solar energy to space.
The scientists determined that the timing of the intervention is crucial. In the simulations performed, the best results were obtained when the procedure was initiated in June and continued until February of the following year.
Among the main observed results are the decrease in temperature variations associated with El Niño, modifications in precipitation regimes in different areas, the reduction of certain extreme effects linked to the phenomenon, as well as possible climatic changes outside the Pacific area.
The method still requires technological advancements
For Jessica Wan, the lead author and postdoctoral researcher at the University of Chicago, the focus of the research lies in understanding how a change in the ocean can impact terrestrial life. She emphasized that public interest should not only be on the temperature inside a container in the Pacific, but on how these impacts translate to the soil.
Despite the findings of the models, the technique presents significant limitations. Currently available equipment does not have the capacity to release particles in sufficient volume. Even with appropriate technology, approximately 2,400 ships would need to be mobilized to generate a noticeable effect.
Climate geoengineering remains controversial
The simulations also highlighted potential negative consequences. While some locations might benefit from the mitigation of El Niño, others could suffer opposite changes, such as warming in parts of Europe and Asia.
An uncertain aspect relates to long-term effects. The study did not evaluate what would happen if the intervention were repeated continuously, in an attempt to control natural climate cycles.
Geoengineering generates disagreements among experts. Critics express concern that such solutions might diminish the urgency to reduce greenhouse gas emissions. Conversely, Wan defends the continuation of research, stating: 'I think it would be irresponsible not to conduct the research, considering the context we are in.'
In summary, the study demonstrates that interfering with the climate can provide new tools against extreme events, but it also underscores the magnitude of the challenges inherent in modifying extremely complex natural systems.
