On the Range of Marine Cloud Brightening Radiative Forcing across Earth System Models
Rattachement africain : us, gb, se. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Abstract. Marine cloud brightening (MCB) is a solar radiation modification method that involves using injections of sea salt aerosol (iSSA) particles to increase cloud albedo and cool surface climate. Earth system models (ESMs) are crucial tools for projecting the potential climate response to MCB, but they must represent many key aerosol and cloud processes using parameterizations that are often poorly constrained and can vary substantially. Here, we conduct simulations in six ESMs, plus four alternate modified parameterizations versions, to compute effective radiative forcing (ERF) from MCB iSSA emissions in three subtropical regions. We a find large range in ERF across the nine models with appropriate aerosol activation, with iSSA mass emissions to get -2 Wm−2 ranging from 7 Tg yr−1 to 93 Tg yr−1 in models. The emitted iSSA size distribution drives much of this spread, as the ESMs use median modal radii ranging from 28.1 nm to 72.5 nm, resulting in major differences in CCN concentration. Forcing from aerosol-cloud interactions drives the majority of the total ERF below about -2 Wm−2 across seven of ten models. At high emission rates, the aerosol-cloud forcing saturates, but the direct aerosol forcing continues to increase sufficiently quickly such that there is no regime in which additional appropriately-sized iSSA emissions would cause warming in any of the ESMs. After accounting for iSSA size distribution, the spread in aerosol-cloud interaction forcing is mainly due to differences in cloud adjustments at low emission rates and mainly due to cloud droplet activation saturation at high emission rates.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- On the Range of Marine Cloud Brightening Radiative Forcing across Earth System Models
- Date Crossref
- 21/09/2026
- Éditeur
- Copernicus GmbH
- Type
- posted-content
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Washington Department of Atmospheric and Climate Science pays non établi dans la noticeUniversité ou école supérieure
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Seattle University pays non établi dans la noticeUniversité ou école supérieure
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University of Exeter Department of Mathematics pays non établi dans la noticeUniversité ou école supérieure
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Stockholm University Department of Meteorology and Bolin Centre for Climate Research pays non établi dans la noticeUniversité ou école supérieure
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Bolin Centre for Climate Research pays non établi dans la noticeStructure de recherche
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Cornell University Department of Earth and Atmospheric Sciences pays non établi dans la noticeUniversité ou école supérieure
Department of Atmospheric and Climate Science — University of Washington, Seattle University et Department of Mathematics — University of Exeter, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.