Non-additive response of the high-latitude Southern Hemisphere climate to aerosol forcing in a climate model with interactive chemistry

Pope, James ORCID: https://orcid.org/0000-0001-8945-4209; Orr, Andrew ORCID: https://orcid.org/0000-0001-5111-8402; Marshall, Gareth ORCID: https://orcid.org/0000-0001-8887-7314; Abraham, Nathan Luke. 2020 Non-additive response of the high-latitude Southern Hemisphere climate to aerosol forcing in a climate model with interactive chemistry. Atmospheric Science Letters, 21 (12), e1004. 10.1002/asl.1004

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Abstract/Summary

A suite of chemistry‐climate model simulations, forced by pairs of anthropogenic forcings [comprising greenhouse gases (GHGs), ozone depleting substances (ODSs), or aerosols], were employed to investigate whether the high‐latitude Southern Hemisphere (SH) circulation response to these forcings is linearly additive, a common assumption in attribution studies. We find that the geographical pattern of sea‐level pressure (SLP) response to a combination of GHGs and ODSs is linearly additive. However, we find significant differences in the SLP response when combining GHGs and aerosols compared to the sum of the individual forcings, a non‐additivity that is currently masked by the dominance of the ODSs forcing. This non‐linearity also results in changes to the SH split jet. These results were obtained using a coupled chemistry‐climate model, indicating that the non‐linear response is due to chemical interactions between the forcing agents. As such, future simulations investigating a post‐ozone hole Southern Hemisphere climate should consider this chemical interaction.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1002/asl.1004
ISSN:	1530261X
Additional Keywords:	Antarctica, anthropogenic aerosols, chemistry-climate models, greenhouse gases, ozone depletion, sea-level pressure
Date made live:	14 Jul 2020 09:21 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/522731

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1002/asl.1004

ISSN:

1530261X

Additional Keywords:

Antarctica, anthropogenic aerosols, chemistry-climate models, greenhouse gases, ozone depletion, sea-level pressure

Date made live:

14 Jul 2020 09:21 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/522731