Modelling impacts of ozone on gross primary production across European forest ecosystems using JULES

作者：Inês Vieira, Félicien Meunier, Maria Carolina Duran Rojas, Stephen Sitch, Flossie Brown, Giacomo Gerosa, Silvano Fares, Pascal Boeckx, Marijn Bauters, Hans Verbeeck · 发表于：Biogeosciences · 年份：2025 · DOI：10.5194/bg-22-6205-2025 · 被引用次数：1 · 研究领域：Plant responses to elevated CO2、Plant Water Relations and Carbon Dynamics、Atmospheric chemistry and aerosols

Abstract. This study investigates the effects of tropospheric ozone (O3), a potent greenhouse gas and air pollutant, on European forests, an issue lacking comprehensive analysis at the site level. Unlike other greenhouse gases, tropospheric O3 is primarily formed through photochemical reactions, and it significantly impairs vegetation productivity and carbon fixation, thereby affecting forest health and ecosystem services. We utilise data from multiple European flux tower sites and integrate statistical and mechanistic modelling approaches to simulate O3 impacts on photosynthesis and stomatal conductance. The study examines six key forest sites across Europe – Hyytiälä and Värriö (Finland), Brasschaat (Belgium), Fontainebleau-Barbeau (France), and Bosco-Fontana and Castelporziano 2 (Italy) – representing boreal, temperate and Mediterranean climates. These sites provide a diverse range of environmental conditions and forest types, enabling a comprehensive assessment of O3 effects on gross primary production (GPP). We calibrated the Joint UK Land Environment Simulator (JULES) model using observed GPP data to simulate different O3 exposure sensitivities. Incorporating O3 effects improved the model's accuracy across all sites, although the magnitude of improvement varied depending on site-specific factors such as vegetation type, climate and ozone exposure levels. The GPP reduction due to ozone exposure varied considerably across sites, with annual mean reductions ranging from 1....