Controls on spatial variation in porewater methane concentrations across United States tidal wetlands.

Tidal wetlands can be a substantial sink of greenhouse gases, which can be offset by variable methane (CH) emissions under certain environmental conditions and anthropogenic interventions. Land managers and policymakers need maps of tidal wetland CH properties to make restoration decisions and inventory greenhouse gases. However, there is a mismatch in spatial scale between point-based sampling of porewater CH concentration and its predictors, and the coarser resolution mapping products used to upscale these data.