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https://www.researchsquare.com/article/rs-3490826/v1 *Authors* Tianle Yuan, Hua Song, Lazaros Oreopoulos, Robert Wood, Huisheng Bian, Katherine Breen, Mian Chin, Hongbin Yu, Donifan Barahona, Kerry Meyer, Steven Platnick *29 October 2023* https://doi.org/10.21203/rs.3.rs-3490826/v1 Abstract Human activities affect the Earth’s climate through modifying the composition of the atmosphere, which then creates radiative forcing that drives climate change 1. The warming effect of anthropogenic greenhouse gases has been partially balanced by the cooling effect of anthropogenic aerosols 2. In 2020, fuel regulations abruptly reduced the emission of sulfur dioxide from international shipping by more than 80%3 and created an inadvertent geoengineering experiment4,5 with global scale. Here we show the regulation leads to a radiative forcing of 0.12 Wm-2 averaged over the global ocean using a combination of modeling and satellite data. The forcing is estimated to effectively double the warming rate of global mean temperature in this decade with strong spatiotemporal heterogeneity. The warming effect contributes 50% to the measured increase in planetary heat uptake since 2020. The radiative forcing also has strong hemispheric contrast of 0.12 Wm-2 and contributes to the measured hemispheric contrast in absorbed solar radiation, which has important implications for precipitation patterns. Our result suggests marine cloud brightening may be a viable geoengineering method in temporarily cooling the climate. *Source: Research Square* -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to geoengineering+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/CAHJsh9_k9_qCQFjAqgDhW1eCJ29Mny1Pz-h-GpYX5%2B3FnKicMg%40mail.gmail.com.
