Reduced winter-time Clear Air Turbulence in the trans-Atlantic region under Stratospheric Aerosol Injection

[Geoengineering News]

https://essopenarchive.org/doi/full/10.22541/essoar.173238705.53228461/v1

Authors

Katie Barnes,Anthony Crawford Jones,Paul D. Williams,Jim M. Haywood

23 November 2024

Abstract

Clear air turbulence (CAT) is a safety threat within the aviation sector and is projected to worsen under global warming. Stratospheric aerosol injection (SAI) is a climate intervention strategy that aims to ameliorate climate change by artificially cooling Earth. Climate model simulations have found a side-effect of SAI would be a strengthening of the positive phase of the North Atlantic Oscillation (NAO). This links to a stronger North Atlantic jet stream and suggests enhanced CAT in the region. Here, we analyse simulations from the UKESM1 climate model to evaluate the impact of a realistic SAI application on winter-time trans-Atlantic CAT. We find a 23 % decrease in severe CAT frequency under SAI when compared to a baseline high-end global warming scenario. Our results indicate that the amelioration of global warming under SAI has a more dominant impact on CAT over the North Atlantic than residual impacts to the NAO.

Source: ESS OPEN ARCHIVES