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Preprints
https://doi.org/10.5194/egusphere-2024-1394
https://doi.org/10.5194/egusphere-2024-1394
24 May 2024
 | 24 May 2024

Multi-model effective radiative forcing of the 2020 sulphur cap for shipping

Ragnhild Bieltvedt Skeie, Rachael Byrom, Øivind Hodnebrog, Caroline Jouan, and Gunnar Myhre

Abstract. New regulations of sulphur emissions from shipping were introduced in 2020, reducing emissions of SO2 from international shipping by ~80 %. As SO2 is an aerosol precursor, this drop in emission over the ocean will weaken the total aerosol effective radiative forcing (ERF) that historically has masked an uncertain fraction of the warming due to increased concentration of greenhouse gases in the atmosphere. Here, we use four global climate models and a chemistry transport model to calculate the ERF due to an 80 % reduction in SO2 emissions from international shipping relative to 2019 emission estimates. The model means of the ERF range from 0.06 to 0.09 W m-2 corresponding to the ERF due to the increase in CO2 concentration over the last two to three years.

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Journal article(s) based on this preprint

04 Dec 2024
Multi-model effective radiative forcing of the 2020 sulfur cap for shipping
Ragnhild Bieltvedt Skeie, Rachael Byrom, Øivind Hodnebrog, Caroline Jouan, and Gunnar Myhre
Atmos. Chem. Phys., 24, 13361–13370, https://doi.org/10.5194/acp-24-13361-2024,https://doi.org/10.5194/acp-24-13361-2024, 2024
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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In 2020 new regulations by the International Maritime Organization of sulphur emissions came...
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