胶州湾海水甲烷氧化速率的水平与垂直变化初步研究

发布时间：2018-08-29 09:29

【摘要】：系统考察2014年4月胶州湾海水中甲烷的氧化速率。通过一系列的海水培养实验,采用气相—稳定同位素比值质谱仪(GC-IRMS)追踪了培养样品中δ13 CH4的变化,计算了胶州湾海水的甲烷氧化速率(MOX)。结果表明:胶州湾表层水中甲烷的氧化速率的变化范围为3.7~255.5nmol·L~(-1)·d~(-1),平均值为(104.7±89.7)nmol·L~(-1)·d~(-1)。底层水中甲烷的氧化速率的变化范围为38.2~227.1nmol·L~(-1)·d~(-1),平均值为(148.9±76.2)nmol·L~(-1)·d~(-1)。总体而言,在胶州湾东部和西部,特别是海泊河口、洋河河口附近的水域,表层海水中甲烷氧化速率的分布都明显呈现出近岸高,远岸低的趋势。胶州湾甲烷的氧化速率与溶解无机碳浓度的变化以及甲酸的含量呈较明显的线性正相关。根据甲烷氧化速率估算出胶州湾氧化甲烷的量为1.15×108 mol/a,该值相当于胶州湾甲烷海-气通量的6.4~14.3倍。
[Abstract]:The methane oxidation rate in Jiaozhou Bay in April 2014 was investigated systematically. The variation of delta 13 CH4 in the cultured samples was tracked by gas phase-stable isotope ratio mass spectrometry (GC-IRMS) through a series of seawater culture experiments. The methane oxidation rate (MOX) in the Jiaozhou Bay seawater was calculated. The range of methane oxidation rate in the bottom water is from 3.7 to 255.5 nmol (-1)(-1)(-1)(-1)(-1) with an average value of (104.7 (-1)(-1) In the waters near the mouth, the distribution of methane oxidation rate in surface seawater shows a trend of high near-shore and low far-shore. The methane oxidation rate in Jiaozhou Bay is positively correlated with the concentration of dissolved inorganic carbon and the content of formic acid. /a, which is equivalent to 6.4~14.3 times of methane air sea flux in the Gulf of Jiaozhou.
【作者单位】：中国海洋大学化学化工学院;海洋化学理论与工程教育部重点实验室;海洋科学与技术青岛协同创新中心;青岛海洋地质研究所;
【基金】：国家自然科学基金项目(41176061)-胶州湾两种生源活性气体甲烷和二甲基硫氧化速率研究;国家自然科学基金创新群体项目(41521064)-海洋有机地球化学资助~~
【分类号】：P734

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