Estimating internal dissolved methane loading in rivers using a mass balance approach.

ABSTRACT: The dynamics of dissolved methane concentration in rivers are influenced by losses through atmospheric emission and microbial oxidation, and by gains from internal (e.g., riverbed sediment) and external (e.g., groundwater) sources. Reducing riverine methane emissions, a key strategy for mitigating global warming, requires decreasing both internal and external loadings. To develop effective mitigation measures, it is essential to quantify these loadings separately. In this study, we estimated the internal methane loading in a river using a mass balance approach. We focused on river reaches without tributary inflow or significant discharge changes, assuming negligible external methane loading. Sampling was conducted at upstream and downstream sites of two short reaches (2.2 and

SUBMITTER: Tsuchiya K 

PROVIDER: S-EPMC12535232 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature