永兴岛大气CH4浓度变化特征及影响因子研究

姜亦飞; 王先桥; 王海燕; 许宇山; 吕洪刚

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中国环境科学 ›› 2021, Vol. 41 ›› Issue (11) : 5054-5059.

大气污染与控制

永兴岛大气CH₄浓度变化特征及影响因子研究

姜亦飞^1,2, 王先桥^1,2, 王海燕², 许宇山³, 吕洪刚^1,2

作者信息 +

Concentration variation and impact factors of CH₄ in Yongxing Island

JIANG Yi-fei^1,2, WANG Xian-qiao^1,2, WANG Hai-yan², XU Yu-shan³, Lü Hong-gang^1,2

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文章历史 +

摘要

依托国家海洋局三沙海洋环境监测中心站，基于激光大气温室气体分析仪（GLA331-GGA），搭建了一套全自动、连续、高精度观测大气CH₄的观测系统.通过气团后向轨迹输送特征，结合数值统计方法（局部近似回归法），对西沙永兴岛区域2013年12月~2017年11月期间的观测数据进行了数据筛分和分析.结果显示：西沙海域大气CH₄季节变化与北半球大气本底变化状况类似，冬季高、夏季低，年平均增长率约为11.9×10^-9，年平均季节振幅为81.1×10^-9；其日变化呈现中午低、凌晨高的单周期正弦变化特征；该区域风场数据和气团后向轨迹分析表明：季风是影响该区域CH₄浓度变化的最主要因素.

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.

导出引用

姜亦飞, 王先桥, 王海燕, 许宇山, 吕洪刚. 永兴岛大气CH₄浓度变化特征及影响因子研究[J]. 中国环境科学. 2021, 41(11): 5054-5059

JIANG Yi-fei, WANG Xian-qiao, WANG Hai-yan, XU Yu-shan, Lü Hong-gang. Concentration variation and impact factors of CH₄ in Yongxing Island[J]. China Environmental Science. 2021, 41(11): 5054-5059

中图分类号： X511

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