Estimation of total landfill surface methane emissions using geospatial approach combined with measured surface ambient air methane concentrations.

The concentration of surface air methane (CH) measured in parts per million by volume (ppmv) near the soil/atmosphere interface should, in theory, have a positive correlation with surface methane emissions fluxes, measured in grams per square meter per day (gmd). Some researchers suggest that CH flux can be reasonably inferred from simple measurements of CH concentrations near the landfill surface. Ground-based and drone-based surface emissions monitoring (SEMs) were performed at several municipal solid waste landfills as tracer correlation method (TCM) testing was being used to measure total methane emissions from the same landfills.