GSA Connects 2021 in Portland, Oregon

Paper No. 119-4
Presentation Time: 2:30 PM-6:30 PM


JOHNS, Thomas and LEE, Eung Seok, Geological Sciences, Ohio University, 139 University Terrace, Athens, OH 45701

Wetlands are considered significant sources of nitrous oxide (N2O) and contribute directly to greenhouse gas production and consumption. However, nitrogen flux in groundwater-dependent ecosystems is complex and remains poorly understood, especially under the current climate crisis. A variety of environmental factors, including groundwater level, air temperature, pH, and soil texture, among others, influence N2O production. In this study, historical data is used in coordination with a combined field, laboratory, and modeling approach to delineate emission rates of N2O at Baeksukjae wetland, a groundwater-dependent wetland, in Gunsan, South Korea. At four sites, we measured in situ N2O gas fluxes, water parameters, and soil properties to quantify input parameters necessary for Denitrification and Decomposition (DNDC) modelling. Multivariate statistical analyses are implemented to characterize relationships between environmental factors and gas flux and to evaluate the applicability and success of the DNDC model. Preliminary modeling and statistical analyses indicate strong correlations between N2O gas production and groundwater level and air temperature. The long-term goal is the creation of a comprehensive and repeatable scheme, capable of monitoring and predicting biogeochemical changes in a variety of groundwater-dependent ecosystems under the influence of climate change.