Modeling methane emissions from the Alaskan Yukon River basin, 1986–2005, by coupling a large‐scale hydrological model and a process‐based methane model

摘要: [1] Much progress has been made in methane modeling for the Arctic. However, there is still large uncertainty emissions estimates due to spatial variability water table depth resulting from complex topographic gradients, and variations production oxidation freezing thawing processes. Here we extended an extant emission module within a biogeochemistry model, Terrestrial Ecosystem Model (TEM), include large-scale hydrology variable infiltration capacity (VIC) model. The VIC model provides required inputs, including fronts, soil temperature moisture, module. effect of topography on redistribution moisture was explicitly modeled using TOPMODEL approach. coupled framework applied Yukon River basin at resolution 1 km 1986 2005. simulations show that average annual net CH4 region are 4.01 Tg yr−1. El Nino phenomena usually lead positive anomalies, while decreases may be associated with strong La Nina events. Precipitation found more closely related dynamics than active layer during study period. This suggests effects processes microtopography should considered quantification emissions.