永兴岛大气CH<sub>4</sub>浓度变化特征及影响因子研究

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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.

Key words： atmospheric methane regional background Yongxing Island

Received: 01 April 2021

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X511

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	JIANG Yi-fei
	WANG Xian-qiao
	WANG Hai-yan
	XU Yu-shan
	Lü Hong-gang

Cite this article:

JIANG Yi-fei,WANG Xian-qiao,WANG Hai-yan等. Concentration variation and impact factors of CH₄ in Yongxing Island[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5054-5059.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I11/5054

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