The large role of declining atmospheric sulfate deposition and rising CO₂ concentrations in stimulating future wetland CH₄ emissions.

ABSTRACT: Existing projections of wetland methane emissions usually neglect feedbacks from global biogeochemical cycles. Using data-driven approaches, we estimate wetland methane emissions from 2000 to 2100, considering effects of meteorological changes and biogeochemical feedbacks from atmospheric sulfate deposition and CO₂ fertilization. In low-CO₂ scenarios (1.5° and 2°C warming pathways), the suppressive effect of sulfate deposition on wetland methane emissions largely diminishes by 2100 due to clean air policies, with resulting emission increases (7 ± 2 Tg a^-1) being 35 and 22% of total wetland emission changes. In mid-CO₂ scenarios (2.4° to 3.6°C warming pathways), sulfate deposition changes modestly, and CO₂ fertilization contributes >30%

SUBMITTER: Shen L 

PROVIDER: S-EPMC11797542 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature