Dataset: Chamber-based Methane Flux Measurements and Other Greenhouse Gas Data for Tidal Wetlands across the Contiguous United States - An Open-Source Database

This dataset focuses on chamber-based methane (CH₄) flux measurements in tidal wetlands across the Contiguous United States (CONUS)and is intended to serve as a community resource for Earth and environmental science research, climate change synthesis studies, and model evaluation. The database contains 35 contributed datasets with a total of 10,445 chamber-based CH₄ flux observations across 41 years and 120 sites distributed across CONUS Atlantic and Pacific coasts and the Gulf of Mexico. Contributed datasets are converted to a standard format and units and organized hierarchically (site, chamber, chamber time series, porewater chemistry, and plant species) with metadata on contributors, geographic location, measurement conditions, and ancillary environmental variables. While focused on CH4 flux measurements, the database accommodates other greenhouse gas flux data (CO₂ and N₂O) as well as porewater profiles of various analytes, experimental treatments (e.g., fertilization, elevated CO₂), and ecosystem disturbance classes (e.g., salinization, tidal restrictions, restoration). This database results from the Coastal Carbon Network’s (CCN) tidal wetland CH₄ flux data synthesis. A description and analysis of the dataset are available in Arias-Ortiz et al. 2024, co-authored by members of the CCN Data Methane Working Group and data contributors.