Preprints
https://doi.org/10.5194/egusphere-2024-1394
https://doi.org/10.5194/egusphere-2024-1394
24 May 2024
 | 24 May 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

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.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Ragnhild Bieltvedt Skeie, Rachael Byrom, Øivind Hodnebrog, Caroline Jouan, and Gunnar Myhre

Status: open (until 11 Jul 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
Ragnhild Bieltvedt Skeie, Rachael Byrom, Øivind Hodnebrog, Caroline Jouan, and Gunnar Myhre
Ragnhild Bieltvedt Skeie, Rachael Byrom, Øivind Hodnebrog, Caroline Jouan, and Gunnar Myhre

Viewed

Total article views: 509 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
357 142 10 509 18 8 7
  • HTML: 357
  • PDF: 142
  • XML: 10
  • Total: 509
  • Supplement: 18
  • BibTeX: 8
  • EndNote: 7
Views and downloads (calculated since 24 May 2024)
Cumulative views and downloads (calculated since 24 May 2024)

Viewed (geographical distribution)

Total article views: 493 (including HTML, PDF, and XML) Thereof 493 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 12 Jun 2024
Download
Short summary
In 2020 new regulations by the International Maritime Organization of sulphur emissions came into force that reduced emissions of SO2 from the shipping sector by approximately 80 %. In this study, we use multiple models to calculate by how much the Earth energy balance changed due to the emission reduction, the so called effective radiative forcing. The calculated effective radiative forcing is weak, comparable to the effect of the increase in CO2 over the last two to three years.