Rethinking the susceptibility-based strategy for marine cloud brightening climate intervention: experiment with CESM2 and its implications

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Apr 13, 2024, 8:39:15 AM4/13/24

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https://essopenarchive.org/doi/full/10.22541/essoar.171201044.45268441/v1

Authors

Chih-Chieh Chen,Jadwiga H. Richter, Walker Lee, Douglas G MacMartin, Ben Kravitz

01 April 2024

Cite as: Chih-Chieh Chen, Jadwiga H. Richter, Walker Lee, et al. Rethinking the susceptibility-based strategy for marine cloud brightening climate intervention: experiment with CESM2 and its implications. ESS Open Archive . April 01, 2024.

DOI: 10.22541/essoar.171201044.45268441/v1

Abstract

Previous modeling studies indicate that even though marine cloud brightening under a susceptibility-based strategy is effective in reducing the global average surface temperature, it triggers a La Niña-like sea-surface temperature response with cooling mostly confined within lower latitudes. Here we explore a different cloud seeding strategy involving seeding of regions with low susceptibility. Simulations with the Community Earth System Model, version 2 (CESM2) reveal that because the regional forcing is weaker and more widespread, cooling is more evenly distributed over the globe. This new strategy also does not result in the La Niña-like state seen in the other strategies.