Effects of Air Temperature, Atmospheric Pressure, and Wind Speed on Methane Emissions in Yonghwasil Reservoir, South Korea

作者：Bo-Kyeong Kim, Hyunki Kim, Hayeon Won, Hyun‐Dong Moon, Subin Choi, Hu Yang, Chang Seok Lee, Hiroki Iwata, Jaeil Cho · 发表于：Environmental Science & Technology Letters · 年份：2025 · DOI：10.1021/acs.estlett.5c00535 · 被引用次数：4 · 研究领域：Atmospheric and Environmental Gas Dynamics、Hydrocarbon exploration and reservoir analysis、Hydrology and Watershed Management Studies

According to the IPCC National Greenhouse Gas Inventory, reservoirs are classified as flooded areas and require methane (CH 4 ) emission estimation. CH 4 emissions from reservoirs, characterized by ebullition and diffusion, primarily increase with temperature but are suppressed when reservoirs are frozen. However, these emissions are influenced not only by temperature but also by other conditions, making it difficult to understand with a single value of the CH 4 emission factor provided by the IPCC. The CH 4 emissions from the Yonghwasil Reservoir in South Korea were measured using the eddy covariance method to analyze their behavior under varying meteorological conditions. CH 4 emissions were positively correlated with air temperature with negligible emissions observed at air temperatures below 8 °C. Therefore, CH 4 emission rates during the summer season are significantly higher than those in winter. From August to October, more than 60% of CH 4 was emitted as ebullition. In contrast, from November to January, total CH 4 emissions decreased, with a resulting 80% from diffusion. Additionally, atmospheric pressure negatively influenced CH 4 emission but was correlated with air temperature. Wind speed had no observable effect on CH 4 emissions at low temperatures but contributed to increased emissions under high-temperature conditions.