How many ships would be needed for effective marine cloud brightening?

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Approximately 2,400 ships would be required for effective marine cloud brightening.

Computer models indicate that artificially brightening clouds over the Pacific Ocean, when strategically timed, could potentially counteract the formation of an El Niño phenomenon and mitigate its most severe consequences. This approach, detailed in a Science Advances study, proposes targeted geoengineering interventions, contrasting with previous research focused on global cooling.
Marine Cloud Brightening as a Geoengineering Strategy

The concept of marine cloud brightening involves using ships equipped with specialized nozzles to spray fine sea salt particles into the lower atmosphere. These particles act as cloud condensation nuclei, leading to the formation of more, smaller cloud droplets. This increases the cloud's reflectivity, causing it to bounce more sunlight back into space, thereby exerting a cooling effect.
Simulating the Impact on El Niño Events

Researchers utilized a sophisticated forecasting model to assess the potential impact of artificial marine cloud brightening on past El Niño events, specifically the 1997–1998 and 2015–2016 occurrences. The simulations focused on a defined rectangular area in the equatorial Pacific. The study found that initiating the intervention in June and continuing it through the following February yielded the most effective results in neutralizing El Niño's effects.
Scale of Intervention and Unintended Consequences

To achieve a significant impact, the models suggest a substantial fleet of ships would be necessary. Even with perfected nozzle technology, an estimated 2,400 ships would be needed to implement the marine cloud brightening strategy effectively. Beyond the engineering and logistical challenges, the simulations also revealed potential unintended consequences, such as localized warming over Europe and Asia, indicating that such interventions might not benefit all regions equally.

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How many ships would be needed for effective marine cloud brightening?

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