Automated real-time analysis of greenhouse gases from rice paddies

Okjung Ju, Gyeonggido Agricultural Research & Extension Services (KR)

The closed chamber method, which is the most commonly-used measurement for the greenhouse gases emitted from the agricultural fields, produces different data depending on measurement conditions and frequency, has limits in the numbers of measurements, and requires a lot of time and labor. The method of  manually collecting and analysing the agricultural greenhouse gases has been widely used in Korea and the national greenhouse gas emission scale factor was calculated in this way. To overcome the limits and save the labor, ICOS (Integrated Cavity Output Spectroscopy) system (Los Gatos Research N2O/CH4 analyzer) was used, which is a real-time-based device to analyze the gases by 1 Hz rate. To measure the methane emitted from the rice paddy of 27mx58.5m size, 9 sampling towers (1.2 m height) were installed by 5 meter distance to collect the gas and the sampling lines were directly connected to the ICOS system. According to the data measured from June to October in 2016, the average concentration in rice paddy was 2859 ppb while it was 2617 ppb measured at 2.4 meters height and 10 meters away from the paddy, revealing that the rice paddy had 242  ppb higher concentration of methane. For the same period (Apr.~Oct.) in 2014, the average concentration of methane in Anmyeondo, which was one of the GAW(Global Atmosphere Watch) regional sites in Korea, was 2020 ppb. The automated real-time measurement and analysis of agricultural greenhouse gases tried in this research made it possible to analyze the hourly and daily variation of greenhouse gas concentration from the agricultural field as well as to achieve more labor-saving and precise analysis without time limits, which otherwise was hardly produced by the chamber method.


Pen Profile

I majored in atmospheric science and worked in the field of climate change at the national institute of environmental research for seven years. From 2012, I’ve studied the amount of greenhouse gases in agriculture working at Gyeonggi-do agricultural research and extension services. To identify and quantify the elements of greenhouse gases emitted in agriculture, I’ve studied urea inhibitor fertilizer, lime fertilizer and other fertilizers using closed chamber in upland and rice paddies. I wrote new estimates of CH4 emission scaling factors dependent on amount of rice straw applied from Korea paddy fields. I’m interested in calculation of exact greenhouse gas emission and development of QA/QC technology of reduction of greenhouse gases emitted in agriculture.


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