Concentration variation and impact factors of CH4 in Yongxing Island
JIANG Yi-fei1,2, WANG Xian-qiao1,2, WANG Hai-yan2, XU Yu-shan3, Lü Hong-gang1,2
1. Key Laboratory of Marine Hazards Forecasting, National Marine Environmental Forecasting Center, Ministry of Natural Resources, Beijing 100081, China; 2. National Marine Environmental Forecasting Center, Beijing 100081, China; 3. Sansha Marine Environmental Monitoring Center, State Oceanic Administration, Haikou 570311, China
Abstract：Based on the laser greenhouse gas analyser (GLA331-GGA), an automatic continuous high-accuracy observation system was set up for real-time measurement of atmospheric CH4 supported by the Sansha Marine Environmental Monitoring Center of State Oceanic Administration. According to the characteristics revealed by backward trajectory of air masses, combining with numerical statistical methods (e.g. robust local regression), the real-time observation data of atmospheric methane in Yongxing Island during the period from December 2013 to October 2017 were screened and analyzed. The results indicate that the concentration of atmospheric CH4 in Yongxing Island presented an apparent seasonal variation:high in winter and low in summer, which is similar to that of the atmospheric background in the Northern Hemisphere. The annual growth rate of CH4 was about 11.9×10-9 on average, and the annual average seasonal amplitude was 81.1ppb. The diurnal variation of CH4 concentration showed a single-period sinusoidal variation:low at noon and high in the wee hours. The analysis of wind field data and backward trajectory of air masses demonstrated that the monsoon is the key factor impacting on the variations of CH4 concentration in the area.
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