Author(s): Youngsun Kim, Un Ji, Jungeun Gu, Jongmin Ko, Hojeong Kang
Keywords: Aquatic systems; Greenhouse gas; Nitrous oxide; Nitrogen dynamics;
Abstract: Nitrous oxide (N2O) is one of the most important non-CO2 greenhouse gases with a global warming potential 265 times greater than that of CO2 over a 100-year time span, making it a major contributor to climate change. Recent studies have shown the importance of aquatic systems, including rivers and estuaries, as a major potential source of N2O. Global estimates of N2O emissions from aquatic systems are 0.25 to 1.26 Tg N yr-1 but clarification remains necessary. To consider the effects of vegetation on water flow and sediment transport, N2O measurements were conducted at three different points (with dense, sparse, and no vegetation) of the hyporheic zone in a straight channel on October 10th, 2018. To determine the nitrogen dynamics in aquatic systems, the physical properties of water such as water temperature, pH, dissolved oxygen (DO) and electrical conductivity (EC) were measured simultaneously at the same points, while N2O measurements and water samples were collected to analyze the concentrations of total nitrogen (TN), ammonia-nitrogen (NH3-N), and nitrate nitrogen (NO3-N) in surface water.