Preprints
https://doi.org/10.22541/essoar.170158317.78990757/v1
https://doi.org/10.22541/essoar.170158317.78990757/v1
31 Jan 2024
 | 31 Jan 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Increasing Aerosol Direct Effect Despite Declining Global Emissions in MPI-ESM1.2

Antoine Hermant, Linnea Huusko, and Thorsten Mauritsen

Abstract. Anthropogenic aerosol particles partially mask global warming driven by greenhouse gases, both directly by reflecting sunlight back to space and indirectly by increasing cloud reflectivity. In recent decades, the emissions of anthropogenic aerosols have declined globally, and at the same time shifted from the North American and European regions to foremost Southeast Asia. Using simulations with the Max Planck Institute Earth System Model version 1.2 (MPI-ESM1.2) we find that the direct effect of aerosols has continued to increase, despite declining emissions. Concurrently, the indirect effect has diminished in approximate proportion to emissions. In this model, the enhanced efficiency of aerosol radiative forcing to emissions is associated with less cloud masking, longer atmospheric residence time, and differences in aerosol optical properties.

Antoine Hermant, Linnea Huusko, and Thorsten Mauritsen

Status: open (until 13 Mar 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-224', Anonymous Referee #1, 20 Feb 2024 reply
Antoine Hermant, Linnea Huusko, and Thorsten Mauritsen
Antoine Hermant, Linnea Huusko, and Thorsten Mauritsen

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Short summary
Aerosol particles, from natural and human sources, have a cooling effect on the climate, partially offsetting global warming. They do this through direct (sunlight reflection) and indirect (cloud property alteration) mechanisms. Using a global climate model, we found that despite declining emissions, the direct effect of human-made aerosols has increased, while the indirect effect has decreased, attributed to the shift in emissions from North America and Europe to Southeast Asia.