资源环境科技发展态势分析平台

Many Chemistry Climate Models (CCMs) include a simplified treatment of brominated very short‐lived (VSL^Br) species by assuming CH₃Br as a surrogate for VSL^Br. However, neglecting a comprehensive treatment of VSL^Br in CCMs may yield an unrealistic representation of the associated impacts. Here we use the CAM‐Chem CCM to quantify the tropospheric and stratospheric changes between various VSL^Br chemical approaches with increasing degrees of complexity (i.e., surrogate, explicit, and full). Our results highlight the improved accuracy achieved by considering a detailed treatment of VSL^Br 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 mid‐latitude free troposphere, resulting in a latitudinally dependent reduction of ∼1−7 DU in total ozone column and a ∼5−15 % decrease of the OH/HO₂ ratio. We encourage all CCMs to include a complete chemical treatment of VSL^Br in the troposphere and stratosphere.