期刊
GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 4, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL091125
关键词
CAM‐ Chem; CCMI; lowermost stratospheric ozone; tropospheric oxidation capacity; very‐ short lived bromine
资金
- European Union's Horizon 2020 Research and Innovation program (Project ERC-2016-COG) [726349]
- Consejo Superior de Investigaciones Cientificas of Spain
- Computational and Information System Laboratory (CISL)
- CONICET
- ANPCyT [PICT 2015-0714]
- UNCuyo [SeCTyP M032/3853]
- NSF [1852977]
- NASA [ACMP 80NSSC19K0983]
- UTN [PID 4920-194/2018]
- European Research Council (ERC) [726349] Funding Source: European Research Council (ERC)
Neglecting a comprehensive treatment of VSLBr in Chemistry-Climate Models (CCMs) can lead to unrealistic outcomes. The inclusion of a detailed treatment of VSLBr can improve the accuracy of the models in representing associated impacts.
Many Chemistry-Climate Models (CCMs) include a simplified treatment of brominated very short-lived (VSLBr) species by assuming CH3Br as a surrogate for VSLBr. However, neglecting a comprehensive treatment of VSLBr in CCMs may yield an unrealistic representation of the associated impacts. Here, we use the Community Atmospheric Model with Chemistry (CAM-Chem) CCM to quantify the tropospheric and stratospheric changes between various VSLBr chemical approaches with increasing degrees of complexity (i.e., surrogate, explicit, and full). Our CAM-Chem results highlight the improved accuracy achieved by considering a detailed treatment of VSLBr photochemistry, including sea-salt aerosol dehalogenation and heterogeneous recycling on ice-crystals. Differences between the full and surrogate schemes maximize in the lowermost stratosphere and midlatitude free troposphere, resulting in a latitudinally dependent reduction of similar to 1-7 DU in total ozone column and a similar to 5%-15% decrease of the OH/HO2 ratio. We encourage all CCMs to include a complete chemical treatment of VSLBr in the troposphere and stratosphere.
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