Dataset: Warming decreases the predictability of methane emissions in a coastal wetland

This dataset contains the CH4 flux data used for forecasts in Lewis et al. (2026), Ecosphere. Methane fluxes were measured monthly from the Salt Marsh Accretion Response to Temperature eXperiment in the Smithsonian's Global Change Research Wetland (GCReW) using a dark static chamber system and a LGR Ultraportable Greenhouse Gas Analyzer or a LICOR LI-7810. This dataset includes flux measurements from 2017-2024.