Estimation of methane emissions from inundated areas in northern Eurasia using a process-based model and remotely sensed inundation dynamics data

作者：Akihiko Ito, Hiroki Mizuochi, Tetsuya Hiyama · 发表于：Progress in Earth and Planetary Science · 年份：2025 · DOI：10.1186/s40645-025-00786-4 · 被引用次数：1 · 研究领域：Atmospheric and Environmental Gas Dynamics、Methane Hydrates and Related Phenomena、Peatlands and Wetlands Ecology

Abstract Northern wetlands are one of the largest sources of methane (CH 4 ), a potent greenhouse gas, and are subject to ongoing rapid climate change. This study attempted to evaluate the CH 4 emissions from northern Eurasia using a process-based terrestrial biogeochemical model and satellite-derived, high-resolution inundation data. Total CH 4 emissions from the inundation area were estimated to be 8.5 Tg CH 4 yr –1 during 2003–2017, with a substantial range of interannual variability (± 0.7 Tg CH 4 yr –1 ). Compared with an estimate based on ground flux measurements, the present model estimation satisfactorily captured fine-scale spatial variation associated with land cover and topography, although smaller inundation in the lowlands could lead to an underestimation of emissions. The seasonal change in CH 4 emissions from negligible rates during cold seasons to high rates in warm seasons was adequately captured during the model simulation. The interannual variability could be associated with broad-scale meteorological events (e.g., high emissions in 2015, the El Niño year), but no long-term trend was found in the annual emissions. This study demonstrated that combining satellite data with a process-based model is effective way to quantify CH 4 emissions in remote extensive areas, although further research and development are required for observational detection of inundation and modeling of biogeochemical processes.