Flood-irrigated agricultural soils can be a significant source of the greenhouse gasses (GHG) carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) (Linquist et al. 2011, Oertel et al. 2016). As these ecosystems are typically characterized by high spatial and temporal heterogeneity, continuous trace gas measurements are needed to better detect patterns and quantify net ecosystem fluxes. Measuring surface fluxes is challenging during periods of inundation, when flooding poses risk of submersion to equipment and the location and nature of the “surface” changes with conditions. However, exclusion of these periods is likely to significantly underestimate annual CH4 emissions, and potentially overestimate N2O effluxes (Anthony and Silver, 2021). Minor modifications were made to to a system comprising Eosense eosAC automated chambers, a Picarro G2508 greenhouse gas analyzer, and an insulated enclosure (Bonar Plastics) that enabled continuous measurements in periodically inundated fields.

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